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revision 1.14 by cnh, Tue Sep 29 18:57:53 1998 UTC revision 1.699 by jmc, Thu Jul 13 22:23:32 2006 UTC
# Line 1  Line 1 
1  $Header$  $Header$
2    $Name$
3    
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o calc_gw:
8     - add cosFacU in zonal viscous flux (harmonic.visc.).
9     - put back side-drag (call new S/R MOM_W_SIDEDRAG) and output.txt.
10       of tutorial_plume_on_slope.
11    o obcs_calc.F : fix index Pb in OBSeta & OBNeta (Thanks to Gianmaria).
12    o calc_gw: true flux-form, account for horizontal grid spacing.
13      update rotating_tank results, but not plume_on_slope (affected at
14      truncation level, 11 digits).
15    
16    checkpoint58l_post
17    o calc_gw:
18     - take bi,bj loops outside calc_gw to fix Pb with local array KappaRU,V
19     - remove side-drag for now (need to fix it); update plume_on_slope results.
20     - fix for partial-cell & non-uniform dz; update plume_on_slope results.
21    o commit code to make SST/SSS weights spatially variable
22      (based on either variable in-situ or variable initial T/S weights)
23    o pkg/ecco:
24      * commit code to relax deviations of xx_theta, xx_salt to 5*sigma,
25        now based on horizontally varying weights wthetaLev, wsaltLev
26      * cost_averagesflags now returns year indices in addition to day, month
27      * sflux balance is performed on annual basis
28        (sflxumm, sfluxmm2, bal_sfluxmm)
29      * for SSH anomaly, separate more cleanly contrib from T/P, ERS, GFO,
30        including separate counting and multipliers
31    o pkg/rbcs
32      * add all necessary infrastructure for pkg/rbcs levN adjoint checkpointing
33    
34    checkpoint58k_post
35    o testreport:
36     - always build in dir. "build" (if not there, mkdir build instead of building
37       & running in input)
38     - run in dir run (if it exists), in build otherwise.
39     - call prepare_run (if input/prepare_run exists)
40     - run multi-threaded test (with new option: "-mth") if file input/eedata.mth exists.
41    o pkg/exf modifications to interpolation and rotation routines for more
42       reasonable treatment of North Pole singularity: for tracers North Pole
43       value is set to northernmost zonal-mean value, for zonal velocity it is
44       set to zero, and for meridional velocity it is set to northernmost value.
45    o pkg/exf/exf_check_range.F
46     - add tile index to diagnostics and move stop statement to the very
47       end of the routine.
48    o pkg/diagnostics: (diagnostics_main_init.F)
49      define title of isomorphic variables according to the current config.
50    o pkg/thsice with pkg/seaice dynamics:
51    - fix domain of computation (interior only, required for exf) and do exchanges
52    - seaice-dynamics forcing: add atmospheric and seaice loading to SSH gradient
53    o towards a standard way of dealing with multi-threading in MONITOR
54      and ${PKG}_MONITOR (all except ptracers_monitor) subroutines.
55    o Pass variable viscosities (vertical and horizontal, e.g., KPP or Leith)
56       to W momentum equation in nonhydrostatic and quasihydrostatic runs.  
57    o make exf_monitor & seaice_monitor independant of the main (dynamics) monitor.
58    o pkg/seaice: fix SEAICEuseEVPpickup parameter (put it in a commom block)
59    o generic_advdiff: DST advection S/R : use local copy of velocity to compute CFL
60       (problems ? with gradient check in bottom_ctrl_5x5 adjoint test)
61    o tracer advection:
62     - clean-up and simplify calc_common_factors.F
63     - make a local copy of velocity and pass it (as u,v,r_Trans) to DST tracer
64       advection subroutine (but still not used within DST advection S/R)
65    o rename pkg aim_ocn_coupler to atm_ocn_coupler (later on, will be used without aim)
66    
67    checkpoint58j_post
68    o new driver S/R: LOAD_FIELDS_DRIVER to load external forcing fields
69      from file (collects calls previously in FORWARD_STEP)
70    o move call to SEAICE_MODEL from FORWARD_STEP to DO_OCEANIC_PHYS
71    o adjoint store dir. adjusted accordingly
72    o genmake2
73      replace target "ad_taf" by $(EXE_AD) ; add $(EXE_AD) to the make CLEAN list.
74    
75    checkpoint58i_post
76    o pkg/seaice: add parameter that allows to scale/turn off effect of seaice
77      on wind stress (SEAICEstressFactor defaults to 1.)
78    o Total number of Timers is finite (<=40): comment out 2 non-essential one
79      in the_main_loop.F to avoid Pb (e.g., when running fizhi test)
80    o vector_invariant: fix highOrderVorticity(=4.th.Order) advection
81      on CS-grid: no longer loosing mass.
82    o exf & curvilinear-grid: no longer modify longitude xC & xG.
83    o pkg/ggl90: fix sloppy output and fix a bug
84    o pkg/seaice: added SEAICEuseEVPpickup parameter
85      - Set to false in order to start EVP solver with
86        non-EVP pickup files when using SEAICEuseEVP
87      - fix sign error in diffusion in seaice_calc_rhs
88    
89    checkpoint58h_post
90    * Modifications for bottom topography control
91      o replace hFacC by _hFacC at various places
92      o replace ALLOW_HFACC_CONTROL by ALLOW_DEPTH_CONTROL
93      o add non-self-adjoint cg2d_nsa
94      o update autodiff support routines
95      o re-initialise hfac after ctrl_depth_ini
96      o works for 5x5 box, doesnt work for global_ocean.90x40x15
97    * Adding verification for 5x5 box (4-layer) bottom topography control
98    
99    checkpoint58g_post
100    o pkg/diagnostics: implement "periodic averaging diagnostics" (e.g.,
101       used for mean seasonal cycle, mean diurnal cycle); add an example
102       in verification/global_ocean.cs32x15/input.thsice/data.diagnostics
103    o pkg/ggl90:
104      - add parameter (minimum surface kinetic energy)
105      - fix bug (avoiding division by zero)
106    o couple pkg/thsice to pkg/seaice:
107      - modify advection in seaice to accomodate new scalar fields to be advected
108      - only muliDimAdection scheme work with seaice/thsice
109      - mapping of thsice-variables to seaice-variables, back and forth
110      - does not break the verification experiments, but does not give the
111        desired results either
112    o pkg/seaice
113      - make (default) second order advection a bit less confusing?
114    
115    checkpoint58f_post
116    o couple pkg/thsice and pkg/exf (as a preparation for coupling pkg/thsice
117      to pkg/seaice):
118      - new routines thsice_map_exf and thsice_get_exf provide the interface
119      - add an additional formal parameter to thsice_solve4temp
120    o pkg/exf:
121      - add new fields wspeed, snowprecip (to be able to couple to thsice)
122      - correct Stefan-Boltzmann constant
123      - new parameter for longwave surface emittance
124      - separate some stuff from exf_bulkformulae into new routines  
125        exf_radiation, exf_wind
126      - add new parameters and constants: longwave emissivity for ocean, ice
127        and snow, evaporation parameters over ice
128      - decouple wind/stress computation from ALLOW_BULKFORMULA: always compute
129        either wind from stress or stress from wind
130    o pkg/thSIce:
131    - split thsice_step_fwd.F in 2 S/R: thsice_step_temp.F & thsice_step_fwd.F
132    - put i,j loops inside S/R: THSICE_ALBEDO, THSICE_SOLVE4TEMP, THSICE_EXTEND
133       and THSICE_CALC_THICKN
134    - for now, call to THSICE_GET_BULKF remains inside i,j loops.
135    - add CPP option: ALLOW_DBUG_THSICE and header file THSICE_DEBUG.h
136      to make debugging easier.
137    - affects results (@ truncation level) of global_ocean.cs32x15.thsice: update output
138    o pkg/bulk_force:
139      - clean-up comments and parameters ;
140      - add new Bulk-Formulae from Large and Yeager, 2004, NCAR/TN-460+STR ;
141    o fix bug in aim+thsice albedo: snow & ice thickness arguments were switched;
142      generate new output for test-experiment: aim.5l_cs.thSI
143    o results_ad : rename "output.txt_adm" to "output_adm.txt" and change
144      testreport accordingly
145    
146    checkpoint58e_post
147    o SEAICE_CGRID adjoint done
148    o R_STAR adjoint implemented.
149      * Seems to just work (based on global_ocean.90x40x15/code_ad_nlfs/ )
150      * need to sort out init. of h0facc, etc.
151    o Make pkg/profile fully independent of ecco,cost, etc. stuff
152      to be able to use it in pure forward.
153    
154    checkpoint58d_post
155    o upgrade simple test-experiment to tutorial example:
156     step.1: duplicate the experiment and (step.2) will remove the old copy.
157      tutorial_barotropic_gyre      <- copy of exp0     (R1:barotropic_gyre_in_a_box)
158      tutorial_baroclinic_gyre      <- copy of exp1     (R1:baroclinic_gyre_on_a_sphere)
159      tutorial_global_oce_latlon    <- empty for now    (R1:global_ocean_circulation)
160      tutorial_global_oce_biogeo    <- copy of dic_example
161      tutorial_deep_convection      <- almost like exp5 (R1:nonhydrostatic_deep_convection)
162      tutorial_plume_on_slope       <- copy of plume_on_slope
163      tutorial_tracer_adjsens       <- copy of carbon   (R1:tracer_adjoint_sensitivity)
164      tutorial_global_oce_optim     <- empty for now (David ?)
165      tutorial_global_oce_in_p      <- copy of global_ocean_pressure
166     some tutorials (R1) were already checked-in under tutorial_examples in release1_branch
167    o correct a sign problem in cost_scat.F
168    o obcs and ptracers: fix boundary conditions for advections schemes
169      with larger stencil
170    o thsice adjoint: start
171    o mom_vecinv: add ISOTROPIC_COS_SCALING flags to mom_vi_hdissip for
172      completeness
173    o mom_fluxform: fixing the mutual use of ISOTROPIC_COS_SCALING
174      and COSINEMETH_III, add comments in default CPP_OPTIONS.h
175    o ptracers adjoint:
176      * avoid extensive recomputatations
177      * fix missing re-init. of gptr (missed by TAF)
178    o obcs: add a flag (OBCSprintDiags, defaults is true) that allows
179      me to turn off the excessive output to STDOUT that this package produces
180    o move NH metric terms & 3.D Coriolis S/R to pkg/mom_common
181      and add those terms in Vector-Invariant formulation.
182    o in ctrl pkg, if ALLOW_CAL, use monthly mean controls
183      if the control period (xx_hfluxperiod etc) is 0
184    o in profiles pkg, clean routines and fix details
185    o in ecco pkg, reading ssh data:
186      fix problem in case the model does not start at iter0=0
187    o fix mnc-pickup/restart for ptracers
188    o new package prifiles:
189      code to compute profile-based cost by Gael Forget
190      (modifs in ecco, ctrl, autodiff)
191    o Benign bug fix in initialization (spotted by M. Mazloff) of
192      ctrl_set_globfld_xz.F ctrl_set_globfld_yz.F
193    
194    checkpoint58c_post
195    o adjoint: finish NLFS adjoint and provide reference output in
196      verification/global_ocean.90x40x15/results_ad_nlfs
197    o seaice: add an EVP solver following Hunke and Dukowicz (1997) and the
198      documentation of CICE. Turn on by defining SEAICE_ALLOW_EVP in
199      SEAICE_OPTIONS.h and SEAICEuseEVP=.true. in data.seaice. Works only
200      with SEAICE_CGRID defined.
201    o move calendarDumps from "data" to "data.cal" and clean-up the code
202      with a simple call to pkg/cal S/R: CAL_TIME2WRITE
203    o add useEXF & useCAL flags (for now, set in hard-coded way)
204    o add S/R to compute NH-metrics terms & Coriolis f' in vertical momentum
205      (were missing in NH mode, and wrong in quasihydrostatic mode).
206      waiting for Chris updated version of calc_gw to add those CALLs.
207    o fix bug in quasihydrostatic S/R ;
208      add a test for this option: global_ocean.90x40x15.qshyd
209    o new S/R "SET_PARMS": set parameters that might depend on the use of some pkgs.
210      (called from INITIALISE_FIXED, after INI_PARMS & PACKAGES_READPARAMS)
211    o add on/off flag useOffLine for package OFFLINE
212    o seaice:
213      - modify advection so that it works also on the C-grid
214      - extend loop ranges in seaice_lsr and seaice_dynsolver; fixes
215        problem in multi-tile runs with C-grid
216      - add flags for clipping ice velocities and/or masking solver forcing
217      - fix drag (ocean on ice) formulation and a bug that caused noise in the
218        C-grid solver
219      - added a few comments to seaice_diffusion.F
220      - separate C-grid and B-grid versions more cleanly (UVM and seaiceMaskU/V
221        are now exclusive)
222      - add a new ocean-ice stress coupling method (Hibler and Bryan, 1987) which
223        required re-ordering the code a little:
224       + make DAIRN global variable (defined in SEAICE)
225       + move computation of the viscosities eta and zeta into a new separate
226         routine (because I need to recompute them in seaice_ocean_stress.F)
227    
228    checkpoint58b_post
229    o AIM+thSIce: fix sign of Short-Wave through the Ice ;
230      update output.txt of exp. aim.5l_cs.thSI
231    o various mnc cleanups and improvements:
232      + shrink lookup tables by factor of ~4
233      + better error reporting when running out of lookup space
234      + able to handle longer path/file names (up to 500 chars)
235    o adjoint:
236      - Another overhaul of store dirs. for NLFS to eliminate  "hidden" recomputations.
237      - TBD: "hidden" mom_vecinv recomp. in dynamics
238    o change forcing_In_AB to affects both T,S forcing and Momentum forcing
239     (allow to differentiate between forcing components using new integer flags:
240      momForcingOutAB=1/0 & tracForcingOutAB=1/0)
241     and add new flag to put Dissipation tendency out of Adams-Bashforth.
242    o ecco
243      - enable trend removal from SSH anomaly obs.
244    o adjoint
245      - a fix for PmEpR when #undef EXACT_CONSERV
246      - fix of "hidden" recomp. in thermodynamics (no TAF warnings)
247      - try to fix "hidden" recomp. in forward_step for NLFS
248        (NLFS seems broken sometimes after I checked it in)
249    o seaice:
250     - add c-grid version of the dynamic solver:
251       + three new routines that are the c-grid substitute lsr, dynsolver
252         and ostres
253       + put a few fields that were local to dynsolver into global common
254         blocks, so that I can move the computation of stresses etc into
255         seaice_lsr (saves coding but may break the adjoint).
256     - replace more hardwired parameters by runtime parameters
257     - add ice masks that mask the rhs of the implicit solvers where there
258       is no ice (commented out in seaice_dynsolver, because i am not sure
259       if this works properly), eventually this should replace the clipping
260       of ice velocities in seaice_dynsolver to +/-40cm/s.
261    o remove the BUILD_INFO.h include from CPP_EEOPTIONS.h and explicitly
262      include it only where its needed
263    o move balancing of fluxes before the call of external_forcing_surf
264    o seaice:
265      - correct units of turning angles (now they are really in degrees)
266      - move computation of GWATX/Y out of main routine into dynsolver
267      - initialize GWATX/Y in seaice_init
268    o Apply mask on Fresh-Water flux (needed for SSH forcing).
269      update output.txt of exp. global_ocean_ebm & cpl_aim+ocn (affects cg2d residual)
270    o seaice: add runtime flags for turning angles (default to zero)
271    o Adding runtime parameter to exf/, ctrl/, to remove on-the-fly global mean
272      and trend from exf forcing and ctrl control adjustments
273    o fix variable aliasing in gad_calc_rhs that cannot be handled by TAF
274      (since checkpoint57x_post)
275    o change the default rotation period to 86164.s = the Earth rotation
276    o 1rst implementation of Implicit IGW using the 3-D solver (use3Dsolver=T)
277      and based on a reference stratification. Tested within hs94.cs-32x32x5.
278    o seaice advection: add code for choosing between the default (2nd order
279      central differences) and multiDim advection schemes provided by
280      pkg/generic_advdiff
281    o seaice:
282      - removed all references to SEAICE_GRID.h fields from
283        dynsolver, advect, diffus, lsr, without changing the results of lab_sea
284        (cubed-sphere configuration will change a little)
285      - grid computations in seaice_init are obsolete now.
286      - cleaned up code a little so that is easier to read (hopefully).
287      - added new (better?) discretizations of default advection and diffusion
288        (turn on with SEAICEuseFluxForm)
289      - replace 1 in 3d global fields by kSurface in growth.F
290      
291    checkpoint58a_post
292    o seaice:
293      - bug fix in advect.F
294    o shelfice:
295      - separate shelfice load anomaly from pload (breaks with time
296        dependent forcing), => introduce constant field shelficeLoadAnomaly.
297        Its default is 0., but it may be computed more cleverly from (unknown)
298        t- and s-profiles (tRef, sRef) and actual EOS. For now this has to be
299        done offline. A good approximation of the pressure load anomaly is
300        necessary to avoid large initial adjustment processes underneath
301        deep-reaching shelfice.
302      - small fix in ISOMIP shelfice_thermodynamics
303      - add more sophisticated thermodynamics of Hellmer (1989), this is
304        now the default
305      - give a few constants more intuitive names
306    o add code to balance EmPmP and Qnet at the end of do_ocean_physics. Useful
307      if bulk formulae are used in long integration (especially EmPmR). Turn
308      on with balanceEmPmR = .true. or balanceQnet = .true. in data, PARM01
309      if balancePrintMean, the imbalance that is substracted is printed to
310      STDOUT.
311    o fix bug (typo) in obcs_apply_eta.F
312    o add a new package shelfice which enables us to model the circulation
313      underneath shelf-ice with draughts of hundreds of meters.
314     - works
315     - to do: + include improved thermodynamics
316              + check whether kSurfC (from model/inc/SURFACE.h) can be used
317                instead of new field kTopC
318              + can we use topoFile, Ro_surf and existing code in ini_depth.F
319                instead of new field R_shelfIce and new code in ini_depth.F
320                and ini_mask_etc.F?
321              + adjust vertical mixing schemes?
322    o seaice pkg:
323     - add a cpp-flag to include a simple formula for a salinity dependent
324       freezing point of sea water at the surface
325     - change the contents of SEAICE_TEST_ICE_STRESS_1 so that zonal and
326       meridional stresses are now different (and hopefully correct)
327    o AIM pkg: change threshold on large-scale condensation to conserve Heat.
328       update results of aim.5l_LatLon test ; fix title & units of AIM diagnostics
329       and  change 3 diagnostics names (OSR,OSRCLR,KM -> TSR,TSRCLR,DRAG)
330    o pkg/diagnostics: add options and parameters for regional-statistics
331       diagnostics ; define regions by reading a region-mask from a file
332       (might add other options later)
333    o pkg/bulk_force:
334     - add option and parameters to use AIM surface-flux formulae.
335     - Change loading part: S/R BULKF_FIELDS_LOAD only take care of bulkf_fields ;
336       others forcing fields (defined in PARM05, parameter file "data") are loaded
337       from S/R EXTERNAL_FIELDS_LOAD, as usually (with useBulkforce = T or F).
338     - initialise all bulkf_fields in bulkf_init.F ; do in-lining of exf_bulkcdn.F
339     - use the right EXCH call for uwind,vwind (to work on CS-grid).
340     - re-arrange header files (move parameters from BULKF.h to BULKF_PARAMS.h)
341       and parameters (note: calcWindStress replaces .NOT.readwindstress).
342     - cleaner interface with pkg/thSIce (new S/R THSICE_GET_PRECIP).
343    
344    checkpoint58
345    o add "--embed-source" option to genmake2 which, when the supporting
346      tools can be compiled (as determined by genmake2) will turn on the
347      embed_files package which then embeds the entire MITgcm source code
348      (*.[fFhc] + Makefile) used for the build within the executable
349      - requested by CNH but off by default
350      - adds a paltry <9MB to the mitgcmuv executable in most cases
351      - only writes the output when useEMBEDSRC in eedata is true
352    o clean up 3-dim. relaxation codes:
353      * Fix I/O inconsistency in pkg/rbcs: replace precFloat32 by readBinaryPrec
354      * Remove 3-dim. relaxation code from pkg/exf (now use only pkg/rbcs)
355      * Thanks to Tom Haine for testing!
356    
357    checkpoint57z_post
358    o make CG3D solver compatible with Free-surface at k > 1 (p-coordinate):
359      affects output (@ truncation level) of exp. plume_on_slope ; updated.
360    o fix the pickup behavior for obcs in combination with ptracers
361    o fix a bug in ptracers_external_fields_load
362    o no AB-2 at the first iteration for Gw (consistent with Gu,Gv,Gt,Gs ...)
363      affects results of NH experiments (but all our NH tests have Gw[it=1]==0 !!)
364    o transfered surface NH pressure to eta field (if exactConserv).
365    o gmredi: fix bugs in slope tapering ldd97 (depthZ had the wrong sign)
366         and update lab_sea output.txt file.
367    o completing 3-dim. relaxation code: additional term
368         1/tau*( theta(i,j,k) - thetaStar(i,j,k) )
369      in S/R EXTERNAL_FORCING_T (file external_forcing.F)
370      * At compile time, in "EXF_OPTIONS.h" set
371          #define  ALLOW_CLIMTEMP_RELAXATION
372          #define  ALLOW_CLIMSALT_RELAXATION
373      * At runtime in "data", under &PARM03 set (e.g., units in seconds)
374          tauThetaClimRelax3Dim = 15552000.0,
375          tauSaltClimRelax3Dim  = 15552000.0,
376      * 3 cases:
377          1) Use a constant-in-time 3-dim. field
378          2) Provide 12 3-dim. fields corresponding to Jan., ... , Dec.
379          3) Real-time relax. to time-evolving prescribed field
380    o Adding Laplacian-type smoothness constraint on
381      initial and boundary (forcing) controls (ic, bc)
382      * enable at compile-time via
383        ALLOW_SMOOTH_IC_COST_CONTRIBUTION, ALLOW_SMOOTH_BC_COST_CONTRIBUTION
384      * enable at run-time via mult_smooth_ic = 1, mult_smooth_bc = 1
385      * Absolute scale somewhat unclear so far
386      * no area weighting was included since no other cost term does so far
387    
388    checkpoint57y_post
389    First step for a NLFS adjoint
390    o initially suppress rStar (new flag DISABLE_RSTAR_CODE)
391    o new init. routines for calc_r_star, calc_surf_dr
392    o still need to deal with ini_masks_etc
393    o testreport seemed happy
394    checkpoint57y_pre
395    
396    o obcs: always reset wVel & eta (to zero or prescribe it) at the OBs.
397    o add new package rbcs (for relaxing ptracers at boundaries/depth/surface etc)
398    o add new offset feature to offline pkg (plus minor cleanup)
399    o cfc fixes for final year of integration
400    o clean up GCHEM_OPTIONS.h/DIC_OPTIONS.h (all options should
401      be in GCHEM_OPTIONS).
402    
403    checkpoint57x_post
404    o fix testreport Pb in multiple test experiment.
405    o cleanup our namelist syntax in verification:
406      - make it more F95 standards compliant (some work still needed)
407      - allows the vast majority of our tests to work with gfortran
408    o Non-Hydrostatic:
409     - put all NH variables (formerly in DYNVARS.h & GW.h) in NH_VARS.h
410     - fix exchange calls for CS-grid using the new EXCH_S3D_RL.
411    o Allow to apply AB on T,S rather than on AB(gT,gS):
412     - implemented within #ifdef ALLOW_ADAMSBASHFORTH_3
413     - use the same arrays (gtNm,gsNm) to hold tracer field at previous
414       time-steps (if AB(T,S)) and tendencies (if AB(gT,gS)).
415     - need a "clever" read_pickup to restart from the other AB formulation
416    o move local commom bloc /GlobalLo/ (used for singleCpuIO) in EESUPPORT.h
417    o remove some unused variables (reduces number of compiler warnings)
418    o adjoint
419      * Disable useVariableViscosity for adjoint for time being
420        (there are a number of extensive recomputations)
421      * Initialize certain variables needed for adjoint
422    
423    checkpoint57w_post
424    o pkg/mdsio: use MAX_LEN_FNAM (instead of hard coded 80) for file-names
425                 fix the singleCpuIO RS version of MDSWRITEFIELD
426       and add a WARNING if using globalFiles=T with multi-processors.
427    o write grid-file(s) in only one format (MDS or MNC): default=MNC (if
428      using MNC); can force MDS output by setting writegrid_mnc=F in data.mnc
429    o tracer advection scheme:
430      add DST-2 (=Lax-Wendroff) & 1rst order upwind schemes (the way to get
431       those 2 schemes before, changing GAD_FLUX_LIMITER.h + to recompile,
432       was not very convenient).
433      add implicit version for DST-3 & DST3_Flux_Limit vertical advection;  
434       (further tests needed for the implicit DST & Flux-Limiter schemes).
435    o PTRACERS: added namelist parameter PTRACERS_ref in analogy to tRef
436      and sRef for convenience, handy, when you want to initialize
437      ptracers in a large domain with a constant non-zero value. Also,
438      untangle ptracers_init.F a little.
439    
440    checkpoint57v_post
441    o change dome exp. to use variable viscosity in side-drag terms.
442    o remove all the files from the cfc_offline test since they are now
443      incorporated into tutorial_cfc_offline which has been producing
444      identical results for a few days of testing
445    o add new parameter: sideDragFactor to enable half-slip-side BC
446      and change side-drag S/R to use viscosity from mom_calc_visc
447      (can switch back by setting sideDragFactor=0.); affects results at
448      truncation level; regenerate output for exp.: global_ocean.cs32x10(x3),
449       global_ocean_ebm, global_ocean_pressure, matrix_example & MLAdjust(x5).
450    o vorticity & strain are now computed without masking, to account for
451      no-slip-side BC in variable viscosity calculation ; mask is applied
452      anyway later on, before computing advection/coriolis terms.
453    o modify exp4 to test new obcs support for reading from external files
454      and for passive tracers
455    o fix behavior of ptracers_monitor when monitor output is written to a
456      netcdf-file; still not independent of monitor.F (writes in the same
457      file).
458    o change default value of tRef (put a uniform, meaningful value for ocean
459      & atmos) and initialize sRef (was missing, as Martin mentioned).
460    o Redefine viscC?Leith*.  Change the coefficients of Leith viscosity
461      to be proportional to enstrophy dissipation length.  Thus,
462       viscC?leith?_new=pi*(viscC?leith?_old)^(1/3)
463      This is now consistent with Smagorinsky and with the manual.
464    
465    checkpoint57u_post
466    o OBCS and PTRACERS: add open boundary support for passive tracers
467      - either use homogenous (pseudo) v.Neumann conditions or prescribe
468        OB-values from file; this is not different from the way theta and salinity
469        are treated
470      - however, Orlanski-radiation conditions are not supported, and the model
471        will stop if you use pTracers and Orlanski at the same time.
472      - beefed up the rountine obcs_external_fields_load: now only those open
473        boundary values are overwritten with values from files for which there
474        are really files, otherwise the OB-fields remain untouched. This makes
475        it possible to use different OBs at different ends of the domain (as
476        with EXF)
477    o reduce number of exch calls in shap_filt (s2).
478    o CS-grid: fix divergence contribution to Leith viscosity. Affects (@
479      truncation level) 4/5 MLAdjust test results (11&12 digits match).
480    
481    checkpoint57t_post
482    o test biharmonic viscosity + no-slip with exp: global_ocean.cs32x15.viscA4
483    o finish adding brackets (coriolis S/R, vecinv) in multi-terms sum to get
484      same truncation, independent of the face number: affects affects several
485      test. exp.: Update global_ocean.cs32x15 (+.thsice) & MLAdjust (all 5).
486    o fix bug in mom_v_sidedrag (biharmonic viscosity was counted 2 times);
487      note that biharmonic viscosity + no-slip was not tested in any experiment.
488    o fix bug in non-linear free-surf side-drag ; generate new output for
489      global_ocean.cs32x15(+.thsice) & global_ocean_pressure.
490    o make mnc honor the writeBinaryPrec flag for most kinds of output
491    o eesupp: split EEPARAMS into EESIZE/EEPARAMS and add a vector global sum
492    o minor change in averaging W (mom_vi_?_vertshear.F) that affects truncation
493      error; update output from global_ocean.cs32x15(+.thsice) & MLAdjust (all 5).
494    o add brackets in multi-terms sum to get same truncation, independent of
495      the face number (manage to get exactly same value of gU,gV at the cs-edge)
496      affects several test. exp. Update global_ocean.cs32x15 (+.thsice).
497    o Clean, new version of mom_calc_visc.  Adds a new feature, viscAhRemax
498      and viscA4Remax, which allow one to limit the minimum viscosity by specifying
499      a maximum grid-scale Reynolds number.  Also, changes all length calculations
500      in the case of grid anisotropy to geometric mean of dx**2 and dy**2.
501      Suggested values of viscosity parameters found in mom_calc_visc.
502      Many new viscosity diagnostics available.
503    
504    checkpoint57s_post
505    o Add clearing-house for viscosity calculations, mom_calc_visc and
506      correct numerous bugs in LeithD and Smagorinsky discretizations.  
507      mom_calc_visc now allows for Smagorinsky, Leith and LeithD to be
508      used simultaneously, and to be used in mom_vecinv and mom_fluxform.
509      Mom_vecinv can be used with standard viscous calculation (mom_vi_hdissip.F)
510      and with Strain-Tension viscous term calculation (mom_hdissip.F).  
511      The Strain-Tension form is now called with useStrainTensonVisc=.true.
512      ViscAhStrain and viscAhTension are now retired.
513    o diagnostics "VISCAHD" & "VISCA4D" replace "VISCAH" & "VISCA4".
514    o In response to JMC's bug report, genmake2 now ignores any soft-links
515      that it finds in the *current* directory when searching for files.
516      Soft-links found in any other source directories will still work as
517      they did before.
518    o add HAVE_SETRLSTK define and useSETRLSTK flag (eedata) which calls
519      a C routine to unlimit the stack size
520    o mnc-ify pkg/aim snapshot vars
521    o mnc-ify pkg/land as requested by Daniel
522    o various changes to mnc including:
523      - all files use the new "BASENAME[[.ITER].{t|f}NUM].nc" format
524      - output can now be grouped so that all files within a group
525          change the ITER portion of their names in lock-step together
526      - can now read ("global") PER-FACE (in addition to PER-TILE) files
527          and works with both EXCH1 and EXCH2 (but needs more testing)
528      - writing works for all verification test cases w/ g77 on Linux
529    
530    checkpoint57r_post
531    o make MNC variable initialization happen earlier
532    o add diagnostics for (almost) each term of the momentum Eq.
533    o remove SST,SSS,UVEL_k2,VVEL_k2 diagnostics.
534    o move pkg timeave out of pkg-groups "oceanic" & "atmospheric" (pkg/pkg_groups)
535    o remove MINIMAL_TAVE_OUTPUT option ;
536      add "dumpInitAndLast" to replace "nodumps" (and MINIMAL_TAVE_OUTPUT).
537    o move some basic S/R (used elsewhere in the code) from pkg/mdsio to eesupp/src
538      allows to compile without pkg/mdsio (& test successfully hs94.1x64x5)
539    o add MNC output for adjoint of EXF (adexf), SEAICE (adseaice)
540    o add time-dependent SST, SSS control
541    o cost terms in ecco/ modularized (new cost_generic.F)
542    o cost_averages routines are modularized (new cost_averagesgeneric.F)
543    o new infrastructure for seaice model vs. obs misfits in seaice/
544      * driver from the_main_loop.F is seaice_cost_driver.F
545      * first term is AREA vs. SMR observation misfit (ALLOW_SEAICE_COST_SMR_AREA)
546      * gradient check in Exp. 6a of natl_box_adjoint/
547    o natl_box_adjoint input_seaice for Lab. Sea now available online via wget
548      (see README file)
549    
550    checkpoint57q_post
551    o fix initialisation Pb in calc_gw (get NANs in exp5 with g77)
552    o fix annoying months-old bug in mnc/mdsio output for seaice pkg
553      - bug was reported by Jean-Michel and Ian Fenty
554    o fix initialization Pb in AIM-Ocean coupled model (aim_sice2aim.F)
555      update exp. cpl_aim+ocn output.
556    o Implement 4-level checkpointing: AUTODIFF_4_LEVEL_CHECKPOINT
557      Needed for high-res. runs with large global files
558      to be able to limit tapelev size
559    o Changed some tests for adjoint:
560      * carbon/ now tests AUTODIFF_2_LEVEL_CHECKPOINT
561      * natl_box_adjoint/code_bulk/ tests AUTODIFF_4_LEVEL_CHECKPOINT
562      * global_ocean.90x40x15/ back to default 3-level checkpointing
563    o Modifications to enable scripted COMMON to MODULE conversion
564      * verification/OpenAD/code/ has necessary scripts and description;
565      * converts, compiles and runs successfully;
566    
567    checkpoint57p_post
568    o reading of delXfile & delYfile moved from ini_parms.F to ini_grid.F
569    o move ${PKG}_MNC_INIT from ${PKG}_READ_PARAMS to ${PKG}_INIT_FIXED
570      (already the case for some pkgs, including recent MNC_init, e.g. thsice)
571    o call CALC_GW from DYNAMICS (instead of from FORWARD_STEP)
572    o Dissipation & phiHyd gradient are always added to gU,gV in timestep.F
573      (was already the case for dissipation with mom_vecinv,
574       and also the case for grad.PhiHyd when staggered-timeStep)
575      This will allow to put dissipation out-off the AB time-stepping.
576     Unfortunately, affects truncation error. Update output of exp. that "fails"
577      (cg2d matching number) and leave the others for later: front_relax(10),
578      global_ocean_pressure(10),ideal_2D_oce(10),internal_wave(9),lab_sea(12),
579      matrix_example(7!),natl_box(12),plume_on_slope(11),vermix(12x3,11x2).
580    
581    checkpoint57o_post
582    o fix MNC/MDSIO flags in PTRACERS so that (1) it works, and
583      (2) its ready to be documented during the 20050801 DocFest
584    o MNC-ify the gmredi package -- tested and works w/ and w/o mnc
585      for ideal_2D_oce and lab_sea on linux_ia32_g77
586    o set to #undef CTRL_SET_OLD_MAXCVARS_30
587      in global1x1_tot/code_seaice_adj to access indices 32, 33
588      (worth another tag)
589    
590    checkpoint57n_post
591    o adding precip control xx_precip 32
592    o adding swflux control xx_swflux 33
593    o Replacing 10 forcing penalty cost routines by 1 generic.
594    o Implementing partitioning in time-mean and variable adjustment
595      for atmos. state.
596    o Time-mean constant error is now read in data.ecco (instead of hard-coded)
597    o in natl_box_adjoint:
598      * updated exp 1 to 10
599        (but does not have time-mean vs. variable split results yet)
600    o updated global1x1/*_seaice_adj/
601      to incorporate latest changes
602    o enable useSingleCpuIO for mdsio vector routines
603      (applies in particular to tapelev I/O)
604    o removed inefficient K-loop in all active_file*control*.F
605    
606    checkpoint57m_post
607    o re-arrange exp. adjustment.cs-32x32x1 (adjust_nlfs.cs-32x32x1 merge into)
608      and advect_cs (use EXCH-2 and standard cs-32 grid files).
609    o pkg/exch2: filling of face-corner halo regions is optional
610      (ifdef W2_FILL_NULL_REGIONS) and is turned off by default.
611    
612    checkpoint57l_post
613     tag before updating tutorials (pre-release-2)
614    o add cos & sin of grid-direction orientation angle (curvilinear grid only,
615       for output and interpolation of input fields onto model grid)
616    o fix radius in mom_v_metric_cylinder.F (wrong by dy/2).
617       Affects results of exp. rotating_tank ; update output.txt.
618    o pkg/diagnostics: 2 new S/R to fill a diagnostics using a scaling factor
619          and taking the square quantity and/or using a fraction-weight field.
620    o fix aim_diagnostics_init.F mate numbers.
621    o add mnc output capability to diagnostics/diagstat and update
622      our cvsignore files for the ACSII output generated
623    
624    checkpoint57k_post
625    o lab_sea now uses diagnostics package and provides a suite of
626      new EXF diagnostics output.
627    
628    checkpoint57j_post
629    o exf
630      * bug fix in exf_bulkformulae for psimh (spotted by Eliyahu Biton):
631        Bracket missing in eqn. for psimh (eqn. 7 of Large & Pond, 1982);
632        terms -2*ATAN(x) + pi/2 were added to both stable and unstable case.
633      * extended diagnostics output
634        - now includes all EXF variables
635        - hs, hl moved to common block
636        - separate S/R for diagnostics, called after ctrl vector is added
637        - name changed for EXFsw -> EXFswnet, EXFlw -> EXFlwnet
638        - EXFqnet contains true Qnet (i.e. includes qsw)
639      * updated verif. lab_sea, global_with_exf
640      * Rearranging hflux (exf_mapfields -> exf_getforcing)
641        to ensure that diagnostics sees a true EXFqnet
642    o add matlab scripts for CS-grid vectors (in utils/cs_grid)
643    o diagnostics pkg: change pointers so that 1 diagnostic can be used
644      several times with different frequencies.
645    o mnc-ify the thsice package as requested by Daniel Enderton
646      - the monitor--MNC output needs work
647      - many attributes need to be added (most are currently blank)
648    o mnc-ify theaim_v23 package as requested by Daniel Enderton
649      - many attributes need to be added (most are currently blank)
650    o remove "groundAtK1" & "rkFac" (replaced by usingPCoords & -rkSign)
651    o add Sadourny like discretization to the 4th.O vorticity advection scheme
652    o fix bug in rStar code (calc_r_star.F) when used with topo/bathy.
653      update output.txt from: aim.5l_cs (& .thSI), cpl_aim+ocn,
654         fizhi-gridalt-hs and global_ocean.cs32x15 (& .thsice).
655    o fix few little things to avoid floating error with -ftrapuv (ifort v9)
656     (ini_spherical_polar_grid.F, calc_r_star.F, monitor/mon_surfcor.F)
657    
658    checkpoint57i_post
659    o Diagnostics package was changed: diagnostic allocation is now deactivated
660      by setting an empty file name in the namelist (used to be by setting 0 frequency)
661    o momentum advection (VI form) options: activate 4th.O vorticity Coriolis ;
662      add 1rst Order upwind vertical Shear.
663    o add a quick fix for A/B checkpointing in OFFLINE mode
664    o add IGNORE_TIME define and -ignore_time option to genmake2 as an
665      end-run around the C/Fortran linking horror in eesup/src/timers.F
666    o added pkg/runclock: allows user to terminate run based on wall clock
667    o added non-hydrostatic scaling parameter: nh_am2
668    o pkg/my82: futile attempt to make results compiler-independent by adding
669      some "_d 0", etc. no effect.
670    o for mnc output, fill the 'T' coordinate var with myTime and create a
671      separate 'iter' variable for iteration count
672    o pkg/diagnostics:
673      add new capability: output of Global/Regional & per-level statistics ;
674      tested against monitor output (including land & thSIce) on various exp.
675    o make seaice-pkg I/O type flags (MNC/MDS) more standard.
676    
677    checkpoint57h_done
678      tag after changing user customized files (DIAGNOSTICS_SIZE.h,
679      data.diagnostics, data.gchem, data.ptracers) is done.
680    
681    o pkg/diagnostics: prepare for Global/Regional statistics.
682      add 2nd namelist in data.diagnostics and update DIAGNOSTICS_SIZE.h
683    o remove "baseTime" (no used) from arg. list of DIFF_BASE_MULTIPLE
684      and rename it: DIFFERENT_MULTIPLE
685    
686    checkpoint57h_post
687    o move tIter0 from data.gchem to PTRACERS_Iter0 in data.ptracers
688    o pkg/diagnostics: change output frequency, now in seconds (instead
689      of Nb of iterations). This requires to change data.diagnostics.
690    checkpoint57h_pre
691    
692    o in mnc, let the user create the output dir if both mnc_outdir_date
693      and mnc_outdir_num are false
694    o add fflags() to pkg/diagnostics which allows one to specify, on a
695      per-file basis, the file precision [default behavior is unchanged]
696    o added diagnostics to pkg/kpp, including computation of mixed layer
697      depth based on a temperature/density criterion
698    o updated verification/natl_box to test the new pkg/kpp diagnostics
699    o bugs fixed (with useAbsVorticity=T & with useJamartMomAdv=T)
700    o test AB-3 code with 4th.Order advection scheme (advect_xy/input.ab3_c4)
701    o fix mnc flags in pkg/seaice so that they are "owned" by seaice,
702      not mnc -- this mistake was found by JMC and is now corrected
703    
704    checkpoint57g_post
705    o add Adams-Bashforth 3rd Order time stepping:
706      - default remains AB-2 (#undef ALLOW_ADAMSBASHFORTH_3)
707      - not yet implemented with NH, CD_Scheme, pTracers, MNC_pickup ...
708    checkpoint57g_pre
709    
710    o make lambda[Theta,Salt]ClimRelax spatially varying
711      (default remains spatially uniform constant based on tau)
712    o added new control variables
713      * init. uVel, vVel, etanN
714      * lambda[Theta,Salt]ClimRelax
715    o separate masks used for ctrl_pack/unpack 'from write_grid' output
716      (suggested by G. Forget)
717    
718    checkpoint57f_post
719    o add parameter "baseTime" = model base time = time at iteration zero
720      new function DIFF_BASE_MULTIPLE (replace DIFFERENT_MULTIPLE) to
721      account for baseTime shift
722    o move Coriolis arrays from PARAMS.h to GRID.h
723    checkpoint57f_pre
724    
725    o mnc-ifying the seaice package
726    o introduced an alternative length scale calculation for use in the limiting
727      maximum viscosity (off by default, see mom_vi_hdissip.F for details)
728    o S/R ptracers_calc_diff: argument list bug for CALL KPP_CALC_DIFF_S
729    o added modified Leith scheme with viscosity proportional to grad(Hdiv)
730      as well as grad(vort3).  Made it compatible with both approximate form
731      for the cubed sphere and full form of these gradients.  Added flag
732      useFullLeith to select between approximate and full form.  
733    o add "d0" in getcon.F to reduce differences between compilers/platforms
734      update output.txt of exp. fizhi-gridalt-hs
735    o change port_rand funtion to allow to set the seed.
736    o fix obscure MNC bug involving conversion between reals and integers
737      - it caused no problems with certain (eg. gcc, ifc) compilers but the
738        new version is now more standards-compliant
739    o adjoint-related modifications
740      * gad_dst3_adv_?: to be able to use advscheme=30 in adjoint
741      * gad_calc_rhs: fool adjoint, revert to advscheme=30 in reverse when using 33
742      * mom_vi_hdissip: to be able to use Leith scheme in adjoint
743    
744    checkpoint57e_post
745    o Adding eddy stress controls a la Ferreira et al.
746    checkpoint57e_pre (actually was tagged: eckpoint57e_pre)
747    
748    o fizhi pkg: fix AtoC and CtoA when called with same input & output array
749      update output.txt of exp. fizhi-gridalt-hs
750    o add more "Z" dimensions and associated coordinate vars to MNC
751    o pkg/exf: added twoDigitYear capability for option useExfYearlyFields
752    o parameter calendarDumps: when set, approximate months (30-31 days) and years
753      (360-372 days) for parameters chkPtFreq, pChkPtFreq, taveFreq, SEAICE_taveFreq,
754      KPP_taveFreq, and freq in pkg/diagnostics are converted to exact calendar
755      months and years.  Requires pkg/cal.
756    o diagnostics: add pickup functionality
757      - off by default for backwards compatibility
758      - current version only uses MDSIO -- MNC will be added
759    o allow to use pkg diagnostics for LAND pkg output & Shapiro Tendencies.
760    o pkg/shap_filt: fix for multi-tiles per face (CS-grid with EXCH2)
761    
762    checkpoint57d_post
763    o pkg/thsice used in the ocean: fix tile Pb related to sIceLoad forcing
764    o modify verification/ideal_2D_oce so that it tests the creation of mnc
765      output from the diagnostics package
766    o temporary fix in EXCH2_UV: add a 3rd call to fix the 24.tiles CS-grid set-up
767    o make genmake2 more portable by using ".$FS" instead of ".f" for more
768      of the test compilations (eg. IBM xlf on Mac OSX w/HFS filesys)
769    o add coordinate variables to the MNC output from the diagnostics package
770    o change MNC-flags default value: true when useMNC=TRUE
771    o add a "readgrid_mnc" flag to MNC and give model/src/ini_curvilinear_grid.F
772      the ability (off by default) to read the grid information using MNC
773    o lab_sea: use LSR_ERROR=1.E-12 for testing ; update output.txt
774    o diagnostics: fix a bug (sub-set of levels); keep full precision when averaging
775    o do snap-shot diagnostics at the middle of the time-interval (instead of
776      at the end).
777    o update exp. aim.5l_cs (use default LAND_OPTIONS.h file) and add
778      new test for AIM with thSIce + slab-ocean
779    o cpl_aim+ocn test: update output (optfile & default GMREDI_OPTIONS.h)
780    o move state variable diagnostics to the beginning of the time step ;
781      (note: still needs some work specially for snap-shot diagnostics)
782      duplicate & replace UVELVVEL diagnostics with UV_VEL_C & UV_VEL_Z
783    
784    checkpoint57c_post
785    o Change testing option (-ieee) to get closer agreement between g77 & ifort
786    o generate new output.txt files on faulks with g77 & the new -ieee option
787    checkpoint57c_pre
788    
789    o add "_d 0" in freeze ; change some "FLOAT" to "DFLOAT" and went back (TAF);
790      update output.txt of exp. global_ocean.90x40x15
791    o fix in ini_eos.F (one "_d 0" was missing): now g77 & ifc give much closer
792      results; update global_ocean_pressure & global_ocean.cs32x15 output.txt
793    o add saltFlux(+File) forcing capability with periodicExternalForcing
794    o allow to use pkg diagnostics for GM-Redi & ThSIce output
795    o diagnostics_fill: fill in up to sNx+1 or sNy+1 (if U,V or Z pt) for mnc.
796    o improvements for the MNC output from DIAGNOSTICS:
797      - correct handling of the unlimitied dimension
798      - all dims now have associated coordinate variables
799      - variables located at U, V, and Corner ("Z") points are now written
800        with the correct horzontal dimensions (eg. 'Xp1', 'Yp1') so that
801        *all* data points are output
802    o added seaice_summary.F and removed obsolete ALLOW_SEAICE's from pkg/seaice
803    o added pkg/seaice/seaice_monitor.F
804    o mdsio_readfield.F can now read files visible only to master MPI process.
805    o pkg/seaice: some test code for ice-modified ocean stress
806    o exf_getffields interpolation defaults to bilinear for all scalar forcing
807      fields (remains bicubic for wind velocity and stress).  This avoids, e.g.,
808      spurious negative numbers for precipitation and humidity.  Will cause
809      some small numerical differences for integrations using pkg/exf/exf_interp.F.
810    o pkg/ctrl/
811      * Add ctrlvec diagnostics in pack/unpack for nondimensional I/O
812        May be enabled via doPackDiag
813      *  introduce z-scaling of
814         + gradient (doZscalePack) and
815         + control (doZscaleUnpack)
816    o pkg/mdsio/
817      * enable useSingleCpuIO for state estimation (ctrl_pack/unpack) mdsio_gl.F
818      * N.B.: leave tiled I/O for tapelev (i.e. mds...vector)
819    
820    checkpoint57b_post
821    o simplify options in diagnostics_fill arguments (remove weird combinations)
822    o fix MNC coordinate variables so that they now contain per-face index
823      values (instead of xC,xG,yC,yG values) when run with EXCH2 since, in
824      general, EXCH2 grids are only aligned to a "local" coordinate system
825    o test diagnostics pkg in dic_example (no output) and ideal_2D_oce (with ouput)
826    o Implement instantaneous output within pkg diagnostics:
827      setting a negative frequency in data.diagnostics produces
828     "snap-shot" output (as opposed to time-average if freq > 0)
829    o move out off EQUIVALENCE all diagnostics that fizhi does not use ;
830      NOTE: change ptracer diagnostics name: use 2 characters to work with
831            more than 9 tracers. Add also diagnostics of advect & diffus flux.
832    o more CF compliance: convert all MNC 'iter' variables to 'T' so that it
833      becomes the coordinate variable for the 'T' dimension
834    o add CF-style coordinate variables to MNC
835      - just a first cut:  numbers are meaningless on the cubesphere and
836        missing along the T axis but otherwise it works!
837    o add surface flux diagnostics: TAUX, TAUY, TFLUX, TRELAX, TICE, SFLUX, SRELAX
838    o pkg/thSIce: read initial state from 6 files ; allow monitor to use MNC.
839    o add diagnostics of advective & diffusive flux for T & S (pTracers coming soon)
840      this is based directly on what the model compute, so that the content of
841      each diagnostics might be affected by switching options (e.g., implicitDiffusion)
842    o small changes for diagnostics (gad_biharm_?.F, arguments of S/R impldiff.F)
843    o clean up build options files for SunOS, in particular
844      - remove -traditional from xmakedepend
845      - change -xarch=v9 to -xarch=native for f77
846      - restore use of make (not gmake)
847      - add CC=gcc if using g77
848    o changes per discussion of AM, JMC, & EH3 today:
849      - move redundant "grid" variables out of "state" -- in preparation of
850        creating proper CF-style coordinate variables and in recognition
851        that any/all grid variables can be easily copied (eg. w/NCO) from
852        the grid files into any of the other NetCDF files
853      - *always* output grid variables with MDSIO (this will eventually be
854        changed)
855      - output MNC grid file if useMNC is true
856    o every instance of _END_MASTER() has been found and replaced with
857      _END_MASTER( myThid ) in order to satisfy certain picky Sun
858      preprocessors
859    o re-arrange diagnostics pkg initialisation:
860     - allow each package to extend the available diagnostics list
861     - add some checking and fix small problems (multi-threaded, ...)
862     - new S/R diagnostics_fill (replace fill_diagnostics):
863       look through the short list of active diag. (instead of the long list)
864       create function DIAGNOSTICS_IS_ON to tell if a diagnostics is active
865    
866    checkpoint57a_post
867    o this set of changes restores TAMC compatibility
868      tested for global_ocean.90x40x15 adjoint on trough
869      (what a pain)
870    
871    checkpoint57a_pre
872    o some modifs in tools/build_options for sunos
873    o call ctrl_pack for ctrl at end for optimcycle=0
874    
875    checkpoint57
876    o add horizontal bi-harmonic viscosity for vertical velocity
877      - new parameter viscA4W (defaults to viscA4)
878      - affects only non-hydrostatic code
879      - to be done: no-slip lateral boundary conditions
880    o switch back to "sflux = sflux - runoff" in exf_getforcing.F
881    o implement Implicit Vertical advection for pTracers
882    o depth convergence accelerator: replace deltaTtracer by dTtracerLev(k)
883      (implemented also for implicit vertical diffusion & advection)
884    o OBCS: extend application of tracer open boundary conditions
885      to a strip beyond the boundary of width Olx/Oly
886    o add call monitor to TAF set of required calls (flow directives)
887      and include in natl_box_adjoint
888    o untangle a few ifdefs related to cost, ctrl, autodiff
889      untangel a few ALLOW_ECCO_OPTIMIZATION
890    o Apply Cooper & Haines representative estimates also at sub-surface (k=Nr)
891      (theta2, salt2 in ecco_cost_weights)
892    
893    checkpoint56c_post
894    o OBCS as control variables
895      - update ctrl_ad_diff.list, obcs_ad_diff.list
896      - remove balance of obcs controls from default
897      - fix index bug nobcs in ctrl_init
898      - fix dummy fields filen in ctrl_pack
899      - add dummy weights for obcs
900    o lsopt: comment out fort.94 output
901    o optim:
902      - remove unnecessary header files
903      - adjusted namelists
904      - add xerbla.F to Makefile
905    o exf:
906      - multiple modifications of exf_check_range
907      - unit change in exf_init_runoff from [m/year] to [m/s]
908    o mdsio:
909      - i/o-vector change debugLevel from debLevA to debLevB
910    
911    checkpoint56b_post
912    o collect all ptracers output in an new routine (PTRACERS_OUTPUT) that
913      is called from DO_THE_MODEL_IO
914      - rename PTRACERS_STATV_WRITE to PTRACERS_WRITE_TIMEAVE
915      - introduce new parameter PTRACERS_dumpFreq (defaults to dumpFreq)
916      - clean up PTRACERS_WRITE_TIMEAVE a little
917    o add another verification experiment that tests both the cfc-pkg and
918      the gchem-pkg with GCHEM_SEPARATE_FORCING undefined, that is with
919      reactive tendencies treated inline with regular timestepping
920    o testreport previously did a lousy job of comparing small numbers, so
921      we (Ed and Martin) changed the  way the cut-off of 1.e-12 is
922      implemented in the little c-progam tmp_cmpnum.c which is embedded in
923      testreport.
924    o ptracers_monitor: bug fix for MPI
925    
926    checkpoint56a_post
927    o GCHEM: finish reorganizating the package
928      - forward_step calls GCHEM_CALC_TENDENDY, which computes gchemTendency
929        (introduces another 3D-array for each passive tracer, but only if
930        GCHEM_SEPARATE_FORCING is undefined. For GCHEM_SEPARATE_FORCING
931        gchemTendency is not needed because the timestep is done separately)
932      - gchemTendency is added to gPtr in GCHEM_ADD_TENDENCY
933      - GCHEM is now---more or less cleanly---separate from PTRACERS
934      - to bo done: handling of surfaceForcingPtr that is needed for KPP not
935        so clear to me how that should be done in a general way.
936    o CFC: improve formatting of output in CFC_ATMOS
937    o PTRACERS:
938      - rename GCHEM_MONITOR to PTRACERS_MONITOR and call it from MONITOR, so
939        that ALL experiments with ptracers enable can be checked. This makes
940        GCHEM_MONITOR obsolete.
941      - include a runtime parameter PTRACERS_monitorFreq that defaults to
942        monitorFreq
943      - set default PTRACERS_write_mdsio to false if PTRACERS_write_mnc is true
944    o add PTRACERS (PTR0[1-5]) to testreport output
945    o exf_check_range:
946      * default changed to .TRUE.
947      * will check values for niter0 if debLevA, every timestep if debLevB
948      * STOP in exf_check_range if 'out of range'
949      * range chosen generous to allow for potential extema
950      TBD: a version with stricter range
951           permitted range would be runtime parameters
952    o GMredi:
953      - fix ldd97 slope limit ; extend valid domain of Psi-Bolus ;
954      - change S/R GRAD_SIGMA to be valid in the overlap on CS-grid.
955      - change the default GMREDI_OPTIONS.h: compile everything except Visbeck
956    o GCHEM:
957      - move call to GCHEM_FORCING_SEP, so that it is now called before
958        the blocking exchanges to avoid computing halos in GCHEM_FORCING_SEP
959      - introduced a useGCHEM runtime flag and applied it everywhere.
960      - renamed PTRACERS_SEPARATE_FORCING to GCHEM_SEPARATE_FORCING;
961        this flag is now only visible within GCHEM-pkg routines.
962      - moved gchem_forcing_int temporarily into ptracers_forcing, this will
963        be replaced by a 3D array that is computed before thermodynamics; for
964        this, the tracer ID iTracer had to be included into the parameter list
965        of ptracers_forcing
966      - set up forward_step to call gchem_forcing, that will replace
967        gchem_forcing_int in ptracers_forcing
968      - cleaning up
969    o small cleaning of exch2: remove files that are also in eesupp/src
970    
971    checkpoint56
972    o AIM: read land-Fraction earlier (from ini-fixed) and monitor land at nIter0
973    o mnc: cleanup "full" files--fixes out-of-memory problem
974    o ECCO-GODAE
975      * model/, pkg/, code/, input/ now complete w.r.t. ECCO-GODAE production setup
976      * fully merged and updated from SIO code
977        windstress sign change affects
978        - exf_inscal_[u/v]stress
979        - sign of xx_tau[u/v] adjustments
980        - signs in cost_scat
981      * ctrl_get_gen: avoid update of tau[u/v] for first few days
982      * natl_box_adjoint updated and compressed
983      * 2-level checkpoint switch added
984        (tested in EXP. 1 of natl_box_adjoint)
985      * new switch doInitXX to avoid init. of xx_... in optimcycle=0
986    o SVD
987      * first complete, non-hacked version for SVD calculations
988      * all interfaces clean w.r.t to handling of xx_..., adxx_..., g_xx_...
989        performed via direct access files admtlm_vector.it????
990        (via ctrl_[un]pack)
991      * optimcycle is used for ARPACK iteration counter
992        (note: adxx_... is iterated, rather than xx_...; latter is constant!)
993      * EV problem ok w.r.t. L2-norm in tangent space; need to check other norms
994        and add linear transforms where necessary
995      * controls are initial/final SST, SSS (can be extended; need to check
996        ctrl_set_[un]pack_xyz.F according to ctrl_set_[un]pack_xy.F
997    o mdsio: filename info to both stderr, stdout
998    o exf: exf_inscal_runoff: separated default conversion [m/year] -> [m/sec]
999      from sign change
1000    
1001    checkpoint55j_post
1002    o isolate dissipation tendency (allow to keep it out off AB) in V.I form.
1003      affects (truncation level) output.txt of global_ocean.cs32x15(&.thsice)
1004    o add consistent build directories and .cvsignore files to verification
1005    o added viscA4GridMin and viscA4GridMax for more control on biharmonic viscosity
1006    o make all subroutines 30 or less characters in length for certain older
1007      compilers to work (a thorough search only turns up two routines in
1008      pkg/ptracers)
1009    o allow (vecinv only) a different horiz. viscosity for Divergence and Vorticity;
1010      affects (truncation level) output.txt of global_ocean.cs32x15(&.thsice)
1011    
1012    checkpoint55i_post
1013    o change arrays for total vertical diffusivity (2.D if explicit,
1014      3.D if implicit) ; each ptracer uses its own background value.
1015    o added mnc/NetCDF output capability to ocn_compon_interf
1016      - added bits to verification/cpl_aim+ocn so that it can run on
1017        ITRDA and other clusters without the mpirun "-wd" option
1018    o fixed wayward endif in mom_fluxform.F that messed up cyclindrical
1019      configuration
1020    o give MNC the ability to create additional files rather than
1021      exceeding a specified file size limit "MNC_MAX_FILESIZE"
1022      - the default is just less than 2GB which is a practical limit
1023        on many systems
1024    o Compute the non-local term using either KPP vertical diffusivity (=default)
1025       or the total vertical diffusivity (when KPP_ghatUseTotalDiffus=T)
1026    
1027    checkpoint55h_post
1028    o add verification test "vermix"
1029    o remove all the *_ioinc flags and replace with the single global
1030      outputTypesInclusive flag
1031    o allow to set a vertical profile of vertical diffusivity for T & S
1032    o call PACKAGE_BOOT & PACKAGES_READPARMS just after INI_PARMS
1033    o useMNC moved from data.mnc to data.pkg
1034    
1035    checkpoint55g_post
1036    o Renaming carbon AD experiments to comply with testreport conventions
1037    o Updating adjoint of Held-Suarez hs94.1x64x5
1038    o Fixing directives for non-ECCO forward_step, after ECCO directives
1039      have been fixed to avoid recomp. of do_oceanic_phys
1040      Works well for global_ocean.90x40x15,
1041      but recomp. issue remains for carbon
1042    o Updating adjoint output for natl_box_adjoint after
1043      pkg/ecco has been modified (see taga c55d_post)
1044    
1045    checkpoint55f_post
1046    o rename to timeave_init_fixed
1047    
1048    checkpoint55e_post
1049    o some delicate re-shuffle of store directives to avoid one
1050      extra call of do_oceanic_physics
1051      affects ecco_the_main_loop.F, do_oceanic_physics.F
1052      checkpoint_lev1_directives.h
1053    o NB: this may break global_ocean adjoint temporarily,
1054      but it is clear how to fix it. Will do later, need this now.
1055    
1056    checkpoint55d_post
1057    o ECCO specific cost function terms (up-to-date with 1x1 runs)
1058    o ecco_cost_weights is modified to 1x1 runs
1059    o modifs to allow observations to be read in as
1060      single file or yearly files
1061    o enable to read exf forcing fields as either
1062      single file or yearly files (flag useExfYearlyFields)
1063    checkpoint55d_pre
1064    
1065    o switch between 2-level and 3-level checkpointing
1066    o add ability of MNC to write local and "partial" (eg. 2D slices where
1067      the full 3D field is never actually stored) arrays to NetCDF files
1068      with the correct (that is, the complete multi-dimensional) set of
1069      array indicies
1070      - used in mom_vecinv() to write the diagFreq output
1071      - tested (demonstrated) in verification/aim.5l_cs
1072    o further mnc-ification
1073      - add verification/lab_sea to the list with mnc setups
1074      - fix undefined mnc v-names in cd_code
1075      - add kpp to mnc output (both snapshot and timeave)
1076    o non-hydrostatic code
1077      - added horizontal viscosity parameter viscAhW for w, that replaces viscAh
1078        in calc_gw.F
1079      - defaults to viscAh
1080      - this is useful, when I want to use viscAh=0 (e.g., only biharmonic
1081        friction or Leith) in non-hydrostatic mode, as long as there is
1082        no biharmonic friction and/or Leigth or equivalent for vertical velocity.
1083    o pkg/cost
1084      extend simple cost functions to treat time mean quantities
1085      (T,U,V) via cost_accumulate_state from cost_tile
1086    o multidimAdvection on CS-grid: implement the full 3 pass ; overlap needs to
1087        be 2 times larger than the minimum size the advection scheme requires.
1088        now get a perfect conservation of salt in advect_cs test-exp (updated)
1089    o GGL90 (Gaspar's TKE mixed layer)
1090      - add horizontal diffusion of TKE, requires exchanges in
1091        do_fields_blocking_exchanges, horizontal diffusivity is zero by
1092        default. In OPA there is no horizontal diffusion of TKE but the
1093        mixing coefficients are computed from a horizontal average of TKE of
1094        6 points or so. I think that diffusion has a little more physical
1095        justification.
1096      - clean up ggl90_calc in the hope of reducing memory usage (this hope
1097        was in vain)
1098      - mask tke-variable in ggl90_init
1099    o fix mask Pb in multidimAdvection on CS-grid (still a small Pb with ipass)
1100    o fix biharmonic diffusion on CS-grid.
1101    o more obcs stuff
1102      - added obcs_external_fields_load as an alternative to the EXF-pkg option
1103        for reading boundary values. This routine is called from
1104        obcs_prescribe_read
1105      - updated obcs_check
1106      - changed sponge layer relaxation parameter units for days to seconds
1107      - turned off sponge layer by default
1108      - changed argument list of OBCS_CALC to myTime+deltaTclock
1109      - fixed about 35 bugs in obcs_external_fields_load
1110    
1111    checkpoint55c_post
1112    o obcs stuff
1113      - new runtime flags useOBCSprescribe, useOBCSbalance
1114      - re-arranged obcs_calc
1115      - moved exf_getobcs to obcs_prescibe_read
1116        obcs_prescibe_read is called after ORLANSKI stuff
1117        and independent of it (executable can contain all).
1118      - updated obcs_check
1119      - added exchanges for U,V,gU,gV for useOBCSprescribe=.TRUE.
1120        These may be necessary only if tangential velocities are
1121        prescribed at OB, not sure, needs testing.
1122    o make the MNC_CW_ADD_VATTR_* subroutines all take scalar arguments
1123      which simplifies the calls and passes the ifc check-bounds test
1124    
1125    checkpoint55b_post
1126    o add a 2D scalar, Z location, exchange_2 routine.
1127    o EXCH_UV for CS-grid: add one u,v in the corner-halo region, allows
1128      to compute vorticity on a wider stencil [e.g., vort3(0,1)&(1,0)]
1129      affects advect_cs results (for the wrong reason): update output.txt
1130    o use a more standard discretization for biharmonic viscosity ;
1131     (original version still available with #define MOM_VI_ORIGINAL_VISCA4 )
1132      affects results of dome set-up: update output.txt
1133    o fix gad_advection.F (CubedSphere part), back to version 1.23
1134    o fix bug in mom_vi_del2uv.F (CubedSphere part).
1135    
1136    checkpoint55a_post
1137    o merged code to
1138      * prescribe/read time-dependent open boundaries
1139        (works in conjunction with exf, cal)
1140      * sponge layer code for open boundaries
1141      * each boundary N/S/E/W now has its own CPP option
1142        (healthy for the adjoint)
1143    
1144    checkpoint55
1145    o up-to-date adjoint of previous breaks
1146      - natl_box_adjoint: problem for exp 12, 13: cost = 0. needs fix
1147      - global_ocean_ebm: adjoint still needs fix (TLM ok)
1148      - global_ocean.90x40x15: extended GMREDI_OPTIONS.h
1149      - carbon: * remove tr1-related adjoint verification
1150                * add ptracer as control variable
1151    o remove all tr1-related code (ALLOW_PASSIVE_TRACER)
1152      (adjoint stuff still has some tr1 'names', but all use ptracer arrays)
1153    
1154    checkpoint54f_post
1155    o in verification/carbin/ remove experiment related to
1156      ALLOW_PASSIVE_TRACER (array tr1 etc)
1157      code_ad/ input_ad/ results_ad
1158    
1159    o add two new packages
1160      - ggl90, TKE-model of Gaspar et al. (1990), Blanke+Delecluse (1993)
1161        + subject to optimization (memory)
1162      - opps, OPPS (ocean penetrative plume scheme) of Paluszkiewicz+Romea (1997)
1163        + subject to reordering (many GOTOs in the original code)
1164        + so far opps is called for every (i,j) point, and then operates in
1165          the vertical; one may want to reorder the scheme in order operate in
1166          horizontal slabs at the cost of (a lot of) memory, at least ten new 3D
1167          fields)
1168    o overhaul of IO so that we now have flags for MDSIO and/or MNC
1169      - all verification tests compile and run with linux_ia32_g77
1170      - defaults are compatible with current input files--nothing
1171        should change if you were not previously using MNC
1172      - MNC output has been added in numerous places (eg. timeave)
1173        but there are still a few writes not yet do-able with MNC
1174        (this is in progress)
1175      - flags now allow for either/or/both use of MDSIO and MNC and
1176        documentation will soon follow
1177      - numerous small formatting cleanups for ProTeX
1178    o add version info (via BUILD_INFO.h) to MNC and stdout
1179    
1180    checkpoint54e_post
1181    o add two new packages
1182      - pp81 (Packanowski and Philander, 1981), Richardson number and
1183        stratification dependent mixing
1184      - my82 (Mellor and Yamada, 1982) level 2 turbulence closure scheme
1185      - these scheme operate in a similar manner as KPP (without ghat, of
1186        course), however there is only one diffusivity that is used for both
1187        temperature and salinity (and passive tracers)ç
1188    o add offline package
1189    o add "verification/dic_example" which contains a dic-gchem-ptracer setup
1190      provided by Stephanie Dutkiewicz
1191    o genmake2: add ability to search for C compilers and cleanup test output
1192      - fixes recent SX-6 problems and should help with others (eg. HP-UX)
1193    
1194    checkpoint54d_post
1195    o data.diagnostics: if levels() is unspecified then ALL levels are diagnosed
1196    o bug fix in pkg/cal/cal_addtime.F for TheCalendar='model' day count is wrong,
1197      leading to additional shift by 5 days each year of integration
1198       (i.e. leading to considerable offset over the years)
1199    o update global_ocean.cs32x15/thsice: use z* + RealFW + staggerTimeStep
1200    o start with no AB and no initial filtering (staggerTimeStep):
1201      change the results of test-exp: hs94.128x64x5, hs94.1x64x5 & hs94.cs-32x32x5
1202    o move ocean specific S/R calls from forward_step.F to do_oceanic_phys.F
1203      (external loading & cpl import/export stay in forward_step.F)
1204    o update coupling interface to work with new staggerTimeStep
1205    o change MDSIO ptracers_pickup.
1206    o fix a bug in Flux deriv. vs Ts (pkg/aim_v23/phy_suflux_sice.F);
1207    o genmake2 fixes so netcdf now works on halem ("osf1_alpha_*")
1208    o bugs fixed in kpp_calc.F (ustarY) and external_forcing.F (Qsw & Partial-cell)
1209    
1210    checkpoint54c_post
1211    o replace surfaceTendency U,V,S,T,Tice,Ptr by surfaceForcing U,V,S,T,Tice,Ptr
1212      this affects (truncation error) output.txt of test-exp:
1213       global_ocean_ebm,_pressure,.cs32x15(&.thsice), lab_sea & natl_box
1214    o pkg/kpp: replace pMask by maskC to reduce memory size (one 3.D array)
1215    o change Qnet to always be the net heat flux, (+upward).
1216      affects (truncation error) output of natl_box exp.: updated
1217    o define the max number of passive tracers in PTRACERS_SIZE.h
1218    o start to test mnc routinely in exp0
1219    o add sea-ice loading (sIceLoad) as a new forcing field.
1220    
1221    checkpoint54b_post
1222    o add testreport "-j JOBS" option for parallel builds (tested and pretty
1223       impressive on Altix and Opteron systems)
1224    o diagnostics can now write NetCDF files through the mnc package
1225    o staggerTimeStep & NLFS: update pkg aim_v23 & thsice; update aim.5l_cs output
1226    o staggerTimeStep & multi-Dim-Advec: Exch(U,V) added
1227    o staggerTimeStep & NLFS: rescale T & S surface tendencies.
1228      affects (truncation error) output of lab_sea & natl_box exp.: updated
1229    o change pickup _cd & _ptracers (old pickup restart: usePickupBeforeC54=.T.)
1230    
1231    checkpoint54a_post
1232    o re-write staggerTimeStep: step fwd U,V and then T,S (reverse the order).
1233    o change pickup file (to restart from old pickup, set usePickupBeforeC54=.T.)
1234    o get a perfect restart when using RealFreshWaterFlux + NLFS (not finished)
1235    o update output of all exp. that use staggerTimeStep (except hs94.cs & 2D)
1236      + internal_wave (shift in writing cg2d_ini_res)
1237    checkpoint54a_pre
1238    
1239    o require forcing_In_AB=.FALSE. and remove surfaceTendencyTice from pkg/seaice
1240      - modified verification/lab_sea and natl_box_adjoint accordingly
1241    
1242    checkpoint54
1243    checkpoint53g_post
1244    o prepare splitting of thermodynamics: store convect.counter in common block
1245    o store d.etaH/dt (instead of Div.hV) in common ; affects (truncation error)
1246      output of: global_ocean.cs32x15, global_ocean_pressure & internal_wave
1247    o cnh's modifs to gad_advection.F for cube-sphere multi-dim advection
1248    o new parameter "nShapS": allow to treat differently S from T (nShapT)
1249    o separate Vert.Advec.Scheme from horizontal Advec.Scheme (T & S)
1250    o restore adjointability
1251    
1252    checkpoint53f_post
1253    o modifications that affect AIM experiment results (update output.txt):
1254      - no advection of S at top interface Nr (pkg/generic_advdiff)
1255      - air surf. temp: use lower value between T0 & T1 (phy_suflux_prep.F)
1256    o AIM pkg:
1257      - include stability function into surf.Flux derivative relative to Tsurf
1258      - calculate clear-sky radiation & surface temp. change (for diagnostics)
1259    
1260    checkpoint53e_post
1261    o merged cylindrical coord configuration
1262    o added rotating_tank experiment
1263    checkpoint53e_pre
1264    
1265    checkpoint53d_post
1266    o faulks upgraded: re-generate output.txt that have changed:
1267       global_ocean.cs32x15(.thsice), global_ocean_ebm, lab_sea, natl_box
1268    o Added Bryan and Lewis, 1979, vertical diffusivity profile
1269    o pkg/land: fix problem in land_impl_temp.F when Ts arround freezing.
1270    o added Sadourny discretization of Coriolis
1271      - moved some PARAMETERS from mom_*_coriolis.F to PARAMS.h
1272      - re-enabled use of omega3 (useAbsVorticity)
1273    o added Leith (Phys. Fluids, 1968, 10, 1409-1416) variable viscosity for
1274      vector-invariant equations
1275      - note: does *NOT* yet use same variable visc. for no-slip BC's.
1276    o recoded the lateral boundary conditions for non-hydrostatic w, this time
1277      hopefully without new bugs
1278      - still to do: biharmonic friction for non-hydrostatic w
1279    o bug fix for mom_*_sidedrag: rA -> rAs,rAw
1280    o regenerated output for global_ocean_ebm (using -ieee)
1281    o fix mom_common/mom_*_sidedrag.F to recover numeric output prior to creation
1282      of mom_common/
1283      - simple re-arrangement of instructions within computing loop
1284    checkpoint53d_pre
1285    
1286    checkpoint53c_post
1287    o new version of coupler for AIM+thSIce and Ocean models
1288     - new fields (SSS,h_MixLayer ...) are exchanged through the coupler
1289     - land: change Evaporation of snow
1290     - aim with thSIce: fix bug in snow-precip.
1291    o changes to calc_gw.F
1292     - bug fix for w^2 term near the bottom boundary
1293     - (hopefully) improve the lateral slip boundary condtions for use with
1294        partial/looped cells
1295      - because the bug fix changes two verification experiments anyway (exp5
1296        and plume on slope), change the lateral boundary condition from half slip
1297        to the value of no_slip_sides
1298    o ebm package wasnt quite up to the parallel task. Fixed that.
1299    o Adjoint of EBM package + verification
1300      * TLM OK
1301      * ADM not sufficient accuracy yet (needs further testing)
1302    
1303    checkpoint53b_post
1304    o Commiting new energy balance model to repository
1305      * package is pkg/ebm
1306      * verif. is verification/global_ocean_ebm
1307      * references are in ebm_driver.F
1308    C      * X. Wang, P. Stone and J. Marotzke, 1999:
1309    C        Global thermohaline circulation. Part I:
1310    C        Sensitivity to atmospheric moisture transport.
1311    C        J. Climate 12(1), 71-82
1312    C      * X. Wang, P. Stone and J. Marotzke, 1999:
1313    C        Global thermohaline circulation. Part II:
1314    C        Sensitivity with interactive transport.
1315    C        J. Climate 12(1), 83-91
1316    C      * M. Nakamura, P. Stone and J. Marotzke, 1994:
1317    C        Destabilization of the thermohaline circulation
1318    C        by atmospheric eddy transports.
1319    C        J. Climate 7(12), 1870-1882
1320    o Will need long integration testing.
1321    checkpoint53b_pre
1322    
1323    o created pkg/mom_common in preparation for variable viscosity code
1324    o renamed and split ini_mnc_io
1325    o pkg/land: only liquid water can diffuse or run-off
1326    o AIM using land: soil wetness availability account for snow
1327    o added printMapIncludesZeros to EEPARMS namelist
1328    
1329    checkpoint53a_post
1330    o restore TAMC compatiility for exf_constants.h
1331      (no usage of _d in .h)
1332    o Additional storing in KPP in an attempt to fix
1333      TAMC problem with adjoint of KPP code.
1334      (no success...)
1335      Identical code works fine with TAF.
1336    o Fixed verification/natl_box_adjoint experiments.
1337      Initial conditions for Experiments 4 and 5 are now
1338      set to "SEAICE_initialHEFF=0", which is more reasonable,
1339      and hence gives results closer to that of Experiment 2.
1340      Experiment 6 requires "SEAICE_initialHEFF=1" and is working once again.
1341    
1342    checkpoint53
1343    o stable checkpoint with up to date adjoint
1344      TLM tests only run for 1st grdchk at the moment. Its unclear if
1345      this is a code problem or a problem with resetting code for g_
1346      variables that is being autogenerated wrong.
1347      Otherwise:
1348       o code is testing well on Linux (P4 and AMD), SGI Alitix and Irix.
1349       o IBM and HPQ tests could not be run because NCAR (IBM) and NCCS (HPQ)
1350         are both still in chaos following their security messes.
1351    
1352    checkpoint52n_post
1353    o various build (mostly genmake2) changes including:
1354      - ability to build/run more easily within Cygwin and MacOS X
1355      - more complicated Makefiles with a stronger dependence on Gnu Make
1356    o pkg/seaice modifications
1357      - added SEAICE_deltaTtherm and SEAICE_deltaTdyn in order to reduce cost
1358        of pkg/seaice.  For time being, SEAICE_deltaTtherm = deltaTtracer
1359        and SEAICE_deltaTdyn must be integer multiple of SEAICE_deltaTtherm
1360      - changed proxy for geostrophic velocity and updated
1361        verification/lab_sea/results/* accordingly
1362      - removed ADI dynamic solver from pkg/seaice
1363      - replaced all occurrences of 1/CSTICE or 1/CSUICE
1364        they caused a segmentation fault under certain circumstances
1365      - removed unused field WATR
1366    o bug fix in exf-package:
1367      -  u/vwind are defined at tracer/pressure points. The values of u/vwindmask
1368         now reflect that.
1369    o small fixes in the cal-package:
1370      - set reference date to first of January for the 'model'-calendar
1371      - failing of cal_CheckDate in cal_FullDate now actually results in a
1372        warning
1373    o small modifications in exf-package to increase flexibility:
1374      - change climtempfreeze from a constant to a runtime parameter that
1375        is specified in data.exf_clim (default = -1.9)
1376      - introduce runtime parameter windstressmax (default = 2.0) that is
1377        specified in data.exf
1378    o fix in pkg/thsice:
1379      - update Evap (Tsf changes) to be consistent with Latent heat flux
1380      - maintain snow precipitation unchanged (even if Tsf >=0).
1381     both affect global_ocean.cs32x15/(.thsice) results ; update output.txt.thsice
1382    
1383    checkpoint52m_post
1384    o commented out call to cal_GetMonthsRec in swfrac.F and added some comments;
1385      this does not change any of the results, because myIter=0 in swfrac always
1386      lead to jwtype=2 (the default anyway), but the call makes little sense
1387      as a default
1388    o no SHORTWAVE HEATING lost at the bottom; affects lab_sea output; updated
1389    o re-work pkg/thsice interface with ocean & bulk_force pkg to allow
1390      atmospheric model (AIM) to use it ; add a "slab ocean" component.
1391    o pkg/aim_v23 : add interface to call thermodynamic sea-ice (thsice)
1392    o update global_ocean.cs32x15/output (.thsice) after changes in pkg/thsice
1393    o extending useSingleCpuIO option to work with new exch2 I/O format
1394      - old-style, missing-tile I/O is still accessible by defining CPP
1395        option MISSING_TILE_IO in pkg/mdsio/MDSIO_OPTIONS.h
1396    o monitor package can write to NetCDF files and/or STDOUT
1397    o fix re-definition bug in MNC_GRID_INIT_ALL()
1398    o doc/api_reference added
1399      - a framework for building an API Reference Manual using all
1400        the "protex" comments embedded in the code
1401      - see pkg/generic_advdiff, pkg/mnc for examples
1402    o MNC:
1403      - make myThid the last argument for all subroutines
1404      - new default for the grid files: NO halos
1405      - add useMNC and other run-time flags
1406      - separate per-file-group handling of the unlimited dimension
1407      - early initialization of MNC w/ flags read at the eeboot stage
1408        and lookup tables set in initialize_fixed
1409      - write all MNC output to a freshly-created directory
1410    o thermodynamics sea-ice (thsice) is now tested with testreport.
1411    o test exp. advect_cs: use the standard cs32 grid ; update output.
1412    o Added functionality to grdchk:
1413      pick global i,j,k position (or nearest wet) where to perform check.
1414    
1415    checkpoint52l_post
1416    o new land formulation:
1417      a) use ground enthalpy as prognostic variable to ensure exact
1418         energy conservation.
1419      b) account for water temperature and for latent heat of freezing
1420         in all processes (rain, run-off, ground storage)
1421      c) compute surface and ground temperature implicitly.
1422    o aim_v23 modification for new land model:
1423      a) Treat separately land / ocean / sea-ice surface fluxes
1424         to allow implicit computation of land & sea-ice surface temp.
1425      b) add snow precipitation.
1426    checkpoint52l_pre
1427    
1428    o fix problem (when 1 tile is empty) in min/max monitor.
1429    o fix bug in timeAve (u,vZetatave in common block)
1430    o no restoring terms under ice for pkg/seaice
1431    o moved SEAICE_DO_DIAGS to S/R do_the_model_io
1432    o bug fix for pkg/seaice pickups
1433    o change MNC call locations and add coordinate attributes
1434    o mask vorticity at the corner ; affects global_ocean.cs output
1435    o fix ini_curvilinear_grid ; test CS experiments with mpi
1436    o aim.5l_cs: modify sea-ice fraction input file ; update output
1437    o exf: Adding simple range check routine for exf fields after read
1438    
1439    checkpoint52k_post
1440    o removed top-level directory "diags"
1441      - we migrated these functions to pkg/timeave a long time ago
1442    o fixed bug introduced in pkg/monitor
1443    o accuracy ctrlprec = 32 insuffient for gradient checks using
1444      averaged fields (I/O via cost_averages)
1445      -> use ctrl.h in active_file*.F to control I/O precision.
1446    o paramter list of CALL ADTHE_MAIN_LOOP
1447    o added initial do_the_model_io to ecco
1448    o set all ...Freq to zero after cost_final
1449      taveFreq, dumpFreq, pChkptFreq
1450    o MAIN and ECCO differentiability restored
1451    
1452    checkpoint52j_post
1453    o fix nchklev in tamc.h for global_ocean...
1454    o Bringing flow and store directives up-to-date
1455    o Really weird thing!
1456      call do_the_model_io from the_main_loop with parameters
1457      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
1458      TAF places a faulty re-call of initialise_varia
1459      after cost_final call which should not be there!
1460    checkpoint52j_pre
1461    
1462    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
1463      error messages
1464    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
1465    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
1466      debug output
1467    o modfied mdsio_writefield.F to handle non-global files under exch2
1468    o update AIM Cubed-Sphere exp (aim.5l_cs):
1469      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
1470    o update AIM Equatorial Channel exp:
1471      use standard aim_v23 pkg and change the SST fields to be more realistic.
1472    o globalFile now works with exch2
1473    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
1474      mon_vort3.F to make exch2 friendly with >1 tile per cube face
1475    o limit timeave output for hi-res integrations
1476    
1477    checkpoint52i_post
1478    o removed CPP_EEOPTIONS.h from verification/*/code
1479    o updated the tiling for global_ocean_pressure
1480    checkpoint52i_pre
1481    
1482    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
1483      the old pkg/aim).
1484    
1485    checkpoint52h_pre
1486    o shortened offending lines in exch2_send_rx?.template
1487    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
1488    o genmake2: add build & execute test for NetCDF code
1489    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
1490      old grid files, moved CPP_EEMACROS.h to pkg/exch2
1491    o added useSingleCPUIO flag to monitor.F and mon_out.F
1492    o added temporary hack for sea-ice dynamics on the cube:
1493      metric terms are ignored and it is assumed that
1494      there is no sea-ice on cube faces 1, 2, 4, and 5.
1495    
1496    checkpoint52f_post
1497    o added exch2 cube routines to pkg/exch2
1498    o modified hs94.cs-32x32x5 to use it
1499    o added new grid files to hs94.cs-32x32x5
1500    checkpoint52f_pre
1501    
1502    checkpoint52e_post
1503    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
1504      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
1505    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
1506      to work with implicit vertical advection and AB ;
1507    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
1508    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
1509     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
1510    checkpoint52e_pre
1511    
1512    o fix bug in impldiff when Nr=1 or Nr=2.
1513    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
1514    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
1515    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
1516      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
1517    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
1518    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
1519    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
1520    
1521    checkpoint52d_post
1522    o re-tiled many expts to allow comparison in multi-processor mode
1523      - updated output accordingly
1524      - changed hs94.128x64x5 to use intial T from file rather than use the
1525        random number generator
1526    o add infrastructure in model routines for fizhi and gridalt packages
1527    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
1528    o changes to permit hi-res, cubed-sphere, configuration
1529      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
1530      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
1531      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
1532        of surface winds for the cube
1533      (A verification experiment, based on global_ocean.cs32x15, but with
1534       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
1535       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
1536       complete with example surface forcing files and matlab scripts to look
1537       at the output and compare it with that of global_ocean.cs32x15.)
1538    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
1539       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
1540       to conform to the common rule.
1541    o check-in the first version of the coupler + interfaces for multi-components
1542       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
1543       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
1544       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
1545       - ocean and atmos. share the same horizontal grid (no interpolation).
1546       - exchanges between component and coupler is done in forward_step
1547    o new verification experiment, cpl_aim+ocn:
1548       coupled ocean - AIM atmosphere on cs32 grid.
1549    
1550    checkpoint52d_pre
1551    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
1552    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
1553    
1554    checkpoint52c_post
1555    o Fixing OPTIONS files for use of exf:
1556      - ALLOW_ECCO not needed
1557      - ECCO_CPPOPTIONS.h should not be included from
1558        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
1559        as has been the case in the past
1560      - All cal/exf related options are currently set in
1561        single header file. Should remain so until we
1562        agree on a consistent new policy.
1563    o Removed all CPP options for cal package.
1564      cal has no more CPP options.
1565    o modified STOREs in GAD_ADVECTION
1566    o corrected key comp. for passkey
1567    
1568    checkpoint52b_post
1569    o new version: "thsice" of thermodynamic sea-ice pkg:
1570     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
1571     - modify fluxes but do not change theta directly;
1572     - light cleaning of bulk_force pkg (still needed with thsice).
1573     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
1574       + output_thsice.txt to test thsice & bulk_force pkgs.
1575    o put back grid & coriolis monitor output.
1576    checkpoint52b_pre
1577    
1578    o call "do_the_model_io" at the beginning (=> dump initial state)
1579    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
1580    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
1581      (need info on NUMBER_OF_PTRACERS)
1582    o missing PTRACERS headers in some routines
1583    o default tamc.h in pkg/autodiff supposed to crash
1584      to ensure proper customization
1585    
1586    checkpoint52a_post
1587    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
1588      - moved surfaceTendencyTice from pkg/seaice to main code
1589      - subroutine FREEZE_SURFACE now limits only surface temperature
1590        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
1591        => new output.txt for global_ocean.cs32x15 & global_with_exf
1592      - keep the old version of FREEZE for backward compatibility;
1593        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
1594      - corresponding modifs for TAF directives
1595    o added surface flux output variables to TIMEAVE_STATVARS
1596    o time-averaged output for pkg/ptracers
1597    o fix problem with ECCO-related divided adjoint
1598      snapshot file was missing some ad-variables,
1599      but no warning issued by TAF
1600    
1601    checkpoint52a_pre
1602    o some bug fixes for #undef REAL4_IS_SLOW
1603    
1604    checkpoint52 = ecco_c52_e35
1605    o after testing adjoints of checkpoint51u_post
1606    
1607    checkpoint51u_post
1608    o this is the post-merge tag of the ecco-branch
1609      (needs another clean checkout and re-testing)
1610    o various natl_box_adjoint configs and results
1611      but no input fields
1612    o obcs adjoint not yet merged!
1613    o adding ECCO global 1x1 and 2x2 degree configs
1614    o updated/extended some store directives for seaice
1615    o pkg/ecco now containes ecco-specific part of cost function
1616    o top level routines the_main_loop, forward_step
1617      supersede those in model/src/
1618      previous input data.cost now in data.ecco
1619      (new namelist ecco_cost_nml)
1620    o in ctrl/ cleaned some cross-dependencies and updated CPP options
1621    
1622    checkpoint51t_post
1623    o this is the pre-merge tag of the ecco-branch
1624    
1625    checkpoint51s_post
1626    o cleanup: removed various obsolete #define-s
1627    o pkg/grdchk
1628      - renamed 'ph-grd 3' to 'grad-res'
1629      - merged from ecco-branch
1630        (remaining bug fixes for obcs gradient checks)
1631      - additional high-precision output for testreport
1632        (grep for 'precision_grdchk_result')
1633    
1634    checkpoint51r_post
1635    o cleaned up or removed CPP_OPTIONS.h files
1636    o updated results for some of the tests to reflect the new
1637      optfiles (-ieee: -O0 instead of -O3)
1638    
1639    checkpoint51q_post
1640    o cd_code:
1641      - moved cd_scheme.F -> cd_code_scheme.F
1642      - separate read_checkpoint from cd_code_ini_vars.F
1643      - separated cd_code part from write_checkpoint
1644      - updated AD_SOURCE, generated .flow
1645      - added CD_CODE_VARS.h to the_main_loop
1646      - Moving cd_code specific store dir.s to pkg/cd_code
1647    o ctrl package totally restructured
1648      - pack/unpack now optional and decoupled from
1649        xx_/adxx_ I/O
1650      - ctrl_pack/unpack cleaned
1651        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
1652      - confined inclusion of AD_CONFIG.h to where necessary.
1653    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
1654    
1655    checkpoint51p_post
1656    o create initial cd_code package
1657      - WARNING: the initialization of fields within packages
1658        is broken because INI_FIELDS (where READ_CHECKPOINT is
1659        called) is called *before* PACKAGES_INIT_VARIABLES.
1660        This seems to be backwards since
1661        1) its important to initially zero the entire field including
1662           the "halo" region
1663        2) zeroing needs to be done *before* reading pickup info
1664           and the pickup call might or might not happen in any
1665           particular run
1666      - this needs an overhaul for R2
1667    o cleanup verification/*/code/GMREDI_OPTIONS.h
1668    o cleanup testreport
1669    
1670    checkpoint51o_post
1671    o bringing AD-related verif's up to date with genmake2
1672      - carbon/
1673      - global_ocean.90x40x15/
1674      - hs.94.1x64x5/
1675      - (front_relax/ )
1676    o (more) consistent directory structure for AD-related verif.'s
1677    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
1678    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
1679    o bug fix in find_alpha.F for MDJWF:
1680      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
1681        change rho -> rho-rhoConst
1682      - replace call find_rho to find_rhonum
1683    o initialisation of rFlx extended to full array (required by TAF)
1684      and shifted to thermodynamics
1685    o removed PTRACERS.h in ptracers routine
1686    o added surfacetendencyPtr to S/R parameter list pracers_forcing
1687    o Correcting initialisations for fVerU, fVerV.
1688    o helping TAF to recognize dependency on kUp for
1689      fVerU, fVerV
1690    o Replacing delZ by delR in pkg/ctrl/
1691    checkpoint51o_pre
1692    
1693    o undid all of cp51 pending some cleanups and discussion
1694    o added the [#include "AD_CONFIG.h"] statement to all files that need
1695       it for adjoint/tl #defines
1696     o re-worked the build logic in genmake2 to support AD_CONFIG.h
1697     o removed tools/genmake since it no longer works
1698    
1699    checkpoint51n_post
1700    o modifications to make FREEZE flux visible to pkg/kpp
1701      - moved surfaceTendencyTice from pkg/seaice to main code
1702      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
1703      - subroutine FREEZE now limits only surface temperature
1704        (this means new output.txt for global_ocean.90x40x15,
1705         global_ocean.cs32x15, and global_with_exf)
1706    o added surface flux output variables to TIMEAVE_STATVARS
1707    
1708    checkpoint51n_pre
1709    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
1710    o added [#include "AD_CONFIG.h"] to all files that use the following
1711      defines:
1712      - ALLOW_ADJOINT_RUN
1713      - ALLOW_TANGENTLINEAR_RUN
1714      - ALLOW_ECCO_OPTIMIZATION
1715    
1716    checkpoint51m_post
1717    o incorporating changes to get TAMC/TAF working in genmake2
1718      - added new TAMC/TAF targets to the Makefile
1719      - various cleanups related to package handling
1720      - these changes should have no impact on the forward model
1721    
1722    checkpoint51l_post
1723    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
1724     - faster algorithm for cal_addtime.F
1725     - higher precision arithmetic, where needed
1726     - pkg/exf *startdate variables changed from calendar date to
1727       model integration time
1728    
1729    checkpoint51l_pre
1730    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
1731    o enable to apply restoring on S & T only in a latitude band.
1732    o update output (external_forcing_surf modif. change truncation errors)
1733       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
1734    
1735    checkpoint51k_post
1736    o change default to: useNHMTerms=.FALSE.
1737     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
1738       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
1739     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
1740        exp1, ideal_2D_oce
1741     - change data file of oceanic exp (leave the results unchanged for now)
1742       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
1743    o set gravitySign automatically according to the vertical coordinate used
1744      (and change sign: back to "logical" value: +1 when R increases downward)
1745    o added an include barrier to the default CPP_OPTIONS.h and
1746      removed the #include "PACKAGES_CONFIG.h" from it
1747    o fix a bug in mom_fluxform (from chk51j_post)
1748    
1749    checkpoint51j_post
1750    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
1751    o adjusted some flow directives (dynamics, thermodynamics)
1752    o added cubed-sphere case to test cost function
1753    o heckpoint_lev?_directives.h now include
1754      pkg-specific directives, whenever those are enabled.
1755    o Moving pkg-specific flow directives to corresponding pkg
1756      Moving pkg-specific differentiation list to corresponding pkg
1757      Moving pkg-specific checkpoint-lev storing to corresponding pkg
1758      ---> conventions are
1759           - pkg_ad.flow
1760           - pkg_ad_diff.list
1761           - pkg_ad_check_lev?_dir.h
1762    
1763    checkpoint51i_post
1764    o merge of the branch-genmake2
1765      - knowingly breaks the older genmake
1766      - automatic generation of all ALLOW_${PKG_NAME} defines
1767      - new testreport supersedes older testscript
1768    o large number of package inclusion and header cleanups
1769    checkpoint51i_pre
1770    
1771    o new output for adjoin of global ocean vector invariant
1772    o fix for checkpoint of thermodynamic seaice and bulk_force
1773    o Steph gchem various cleanups
1774    
1775    checkpoint 51h_pre
1776    o fixed some single quotes
1777    o modify gchem pkg to be more versatile
1778    o modifications to clean up dic pkg
1779    o add pkg/cfc
1780    
1781    checkpoint51g_post
1782    o provide links for ARPACK and ADM*TLM
1783    o start removing verification/vero/
1784    o update AD-related stuff
1785      (in particular some IF-statements in model/src/ routines)
1786    o adding to verification/global_ocean.90x40x15/ adjoint of
1787      vector invariant setup
1788    
1789    checkpoint51f_post
1790    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
1791    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
1792      of tracer Green's fucntions for ocean inversion project.
1793    
1794    checkpoint51f_pre
1795    o Added on-the-fly spatial interpolation capability
1796        "USE_EXF_INTERPOLATION" to pkg/exf.
1797      - This is a temporary Cartesian-grid hack until
1798        the super-duper ESMF coupler becomes available.
1799      - See verification/global_with_exf/README for usage example.
1800      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
1801        flags and modified pkg/seaice accordingly.
1802    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
1803        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
1804        non-local transport term.
1805    
1806    checkpoint51e_post
1807    o pkg/mom_vecinv:
1808      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
1809      - add time-ave diagnostic of vorticity advection.
1810    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
1811    o atmospheric geopotential: - include water vapor effect;
1812                                - use p^kappa in p* scaling.
1813    o land pkg: read initial state from files.
1814    o AIM : add stratospheric drag in the upper level
1815    
1816    checkpoint51d_post
1817    o change function ILNBLNK (=> last non-blank char.) to return zero
1818      (instead of the string length) when the string. char is empty
1819    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
1820    o modif's to restore TAMC compatibility
1821      - avoid "_d" constructs in PARAMETER declarations
1822      - avoid interrupting lines by comment lines
1823    o Use cluster local disks for purely local I/O
1824      vs. globally visible disks needed for ctrl stuff
1825      (merged from ecco-branch)
1826      - new active_file_loc... and mdsio_..._loc routines
1827      - affected packages: autodiff, ctrl, grdchk, mdsio
1828    
1829    checkpoint51c_post
1830    o introducing integer flag debugLevel
1831      - debLevZero: suppress all output
1832      - debLevA: standard
1833      - debLevB: equivalent to current debugMode=.TRUE.
1834    o introducing pathname variable mdsioLocalDir for mdsio
1835      that can be specified at runtime
1836      (relevant for cluster I/O to local disk)
1837    `
1838    >>>checkpoint51b_post
1839    adjoint of ptracers
1840    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
1841    o extended state in checkpoint_lev?, etc.
1842    o alternative ctrl/cost with tr1 or ptracer
1843    o new comlev1_bibj_ptracers
1844    o new ptracers.flow
1845    o made ptracers_forcing same as external_forcing_s
1846    o added verification for adjoint with ptracers
1847      - adm. grdchk fail so far
1848      - tlm. grdchk OK
1849      - checked tapelev/comlev recomputations: OK
1850    <<<checkpoint51b_pre
1851    
1852    checkpoint51a_post
1853    o added code for biogeochemistry package
1854      - new pkgs: dic, gchem
1855      - new subroutine in ptracers
1856    o modify code for biogeo packages
1857      - in model/src and pkg/ptracers
1858    
1859    checkpoint51
1860    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
1861      - autodiff, ctrl, exf, grdchk, seaice
1862      kept separate packages
1863      - cost, ecco, obcs
1864    o updating verification/internal_wave, verification/lab_sea
1865      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
1866    
1867    checkpoint50i_post
1868    o Preparing next differentiable checkpoint and sync
1869      of MAIN vs. ecco-branch
1870      - 1st step: this one is differentiable
1871      - 2nd step: next(! not this) checkpoint will have updated packages
1872                  from ecco-branch)
1873    
1874    checkpoint50h_post
1875    o new package "land": provide surface BC for AIM.
1876    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
1877    o AIM: use true log-P extrapolation for near surface temp (= as in
1878        F.Molteni paper) ; update aim.5l_cs output.
1879    o New variable in PARM03 for more flexible pickups
1880    o somewhat cleaned package initialisation sequence for
1881      ctrl/ cost/ ecco/ in packages_... routines
1882    
1883    checkpoint50g_post
1884    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
1885      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
1886      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
1887        made the default because of faster convergence than ADI
1888    
1889    checkpoint50f_post
1890    o exf totally restructured
1891      - replaced all exf_set_ routines by one generic exf_set_gen.F
1892        and made sure it's still differentiable
1893      - split exf_getffields.F into new exf_bulkformulae.F
1894      - exf_inscal_/exf_outscal_ suffixes consistent with field names
1895      - updated adjoint/makefile and relevant verif. accordingly
1896    
1897    checkpoint50f_pre
1898     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
1899          + change Evap over land. (update aim.5l_cs output)
1900     o added missing .cvsignores and made uniform across expts
1901     o changed configuration of tidal_basin_2d expt
1902     o added pkg/debug functions for tracing code in fatal crashes
1903     o tidied pkg/monitor to use MONITOR_OPTIONS.h
1904     o new fn in pkg/monitor to stop model if solution grows too big
1905     o removed lots of single quotes from comments
1906    
1907    checkpoint50e_post
1908    o make KPP work with PTRACERS
1909     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
1910       nearly a copy of kpp_transport_s
1911     - there is no analogue to SurfaceTendencyS, so I have to use
1912       gPtr(of the surface layer) instead
1913    o add a new platform SunFire+mpi (SunFire 15000) to genmake
1914    checkpoint50e_pre
1915    
1916    checkpoint50d_post
1917    o change kpp output from multiple-record state files to single-record state
1918      files analogous to write_state.F
1919    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
1920      analogous to the cg2d-related output.
1921    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
1922      so that writing to internal file fn (with length 512) fails.
1923    checkpoint50d_pre
1924    
1925    checkpoint50c_post
1926    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
1927    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
1928    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
1929    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
1930    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
1931    
1932    checkpoint50c_pre
1933    Merging from release1_p13:
1934    o bug fix for pkg/seaice dynamic solver
1935    o Added SEAICE_initialHEFF to pkg/seaice
1936    
1937    checkpoint50b_post
1938    o store u*,v* in gU,V instead of in guNm1,gvNm1
1939    o in order to put the momForcing out of the Adams-Bashforth:
1940      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
1941      to timestep.F
1942    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
1943    o re-generate output for highly sensitive test-exp:
1944       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
1945    
1946    checkpoint50b_pre
1947    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
1948    o corrected CPP option mismatch in exf_Bulk... functions for case
1949      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
1950    
1951    checkpoint50a_post
1952    o Bug fix for merging between c50 and KPP.
1953      ikey was passed from thermodynamics to kpp_calc via
1954      common block rather than being recomputed in kpp_calc,
1955      in contradiction with new key itdkey.
1956      New key ikppkey created, and tamc.h headers updated.
1957    
1958    checkpoint50
1959    - 2nd step of merge with ecco-branch:
1960      merge changes in ecco-branch back into main trunk
1961    - bug fix in find_alpha
1962    - more storing in gmredi_calc_tensor.F, kpp_routines.F
1963    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
1964    - merged some sliced AD support routines
1965    
1966    checkpoint49
1967    merged from ecco-branch:
1968    o exf:
1969      - Enable initialisation of forcing fields to constant
1970        (runtime) values.
1971      - in exf_getffields.F
1972        Reduce i-/j-loop to interior domain, discarding overlaps.
1973        That also fixes wrong TAF-key computations for key_1, key_2
1974        with bulf formulae.
1975      - exf_init.F modify #ifdef for exf_init_evap
1976      - exf_getffieldrec.F, ctrl_getrec.F
1977        The following INT-usages are not safe:
1978          fldsecs  = int(fldsecs/fldperiod)*fldperiod
1979          fldcount = int(fldsecs/fldperiod) + 1
1980        and were modified.
1981    o autodiff: checkpoint_lev...
1982      - updated storing for bulk formulae (some arrays were missing)
1983      - added state for seaice package
1984      - synchronized with main branch
1985    o DIVA:
1986      Modif.s in
1987      - the_main_loop.F
1988      - the_model_main.F
1989      and added cost_final_restore.F cost_final_store.F
1990      o With these changes, it is possible to fully separate
1991        the first forward run to compute the cost function (mdthe_main_loop)
1992        and adjoint runs over individual DIVA intervals (adthe_main_loop)
1993        into separate model executions.
1994        This enables better tuning of DIVA to given queue sizes.
1995      o Loss of cost function value in consecutive DIVA runs is
1996        fixed by storing to 'costfinal' file.
1997      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
1998        beginning/end of adjoint integration is accounted for.
1999      The current changes apply to TAF-1.4.26.
2000      TAF has one remaining bug, requiring one manual change
2001      (see MITgcm manual).
2002    o cal: synchronized between MAIN and ecco-branch
2003    
2004    checkpoint48i_post
2005    o Changes to restore differentiability of code w.r.t. previous tag
2006      (mostly adding new routines to make list and replacing
2007      pressure by totPhiHyd).
2008    o Updated and merged grdchk package
2009      - has both ADM and TLM checks
2010      - works for single- and multi-proc.
2011      - output cleaned
2012      - worked successfully for parallel DIVA
2013    o genmake:
2014      - Adding -platform=SP4
2015      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
2016    o Modif. for DIVA:
2017      ctrl_unpack should not be called in intermediate DIVA interval.
2018      (similar thing would apply for active files such as
2019      tbar, sbar, psbar, which should not be reinitialised;
2020      only relevant for ecco-branch)
2021    
2022    checkpoint48h_post
2023    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
2024    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
2025    o Added SEAICE_initialHEFF to pkg/seaice
2026    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
2027    
2028    checkpoint48g_post
2029    --- EOS:
2030    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
2031      store total Potential in totPhyHyd for diagnostics & EOS.
2032    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
2033    --- Pressure/geopotential gradient:
2034    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
2035    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
2036      ( changes results of global_ocean_pressure )
2037    o NLFS + z-coord.: add eta*Rho' contribution.
2038    o accurate phiHyd when using interface-W at the middle between 2 centers
2039     ( changes results of ideal_2D_oce )
2040    o includes r* 2nd term in potential gradient.
2041    
2042    checkpoint48f_post
2043    Merging from release1_p12:
2044    o Modifications for using pkg/exf with pkg/seaice
2045      - improved description of the various forcing configurations
2046      - added basic radiation bulk formulae to pkg/exf
2047      - units/sign fix for evap computation in exf_getffields.F
2048      - updated verification/global_with_exf/results/output.txt
2049    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
2050      (SBO) core products, including oceanic mass, center-of-mass,
2051      angular, and bottom pressure (see pkg/sbo/README.sbo).
2052    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
2053      to avoid negative values in shallow regions.
2054      - updated verification/natl_box/results/output.txt
2055      - updated verification/lab_sea/results/output.txt
2056    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
2057    o Added useSingleCpuIO option (see PARAMS.h).
2058    o Updated useSingleCpuIO option in mdsio_writefield.F to
2059      work with multi-field files, e.g., for single-file pickup.
2060    o pkg/seaice:
2061      - bug fix in growth.F: QNET for no shortwave case
2062      - added HeffFile for specifying initial sea-ice thickness
2063      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
2064    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
2065      kpp_transport_t.F, forward_step.F, and the_main_loop.F
2066    o pkg/seaice:
2067      - adjoint-friendly modifications
2068      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
2069    
2070    checkpoint48e_post
2071    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
2072    o dynamics: change definition of computational domain & adapt mom_fluxform
2073      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
2074    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
2075        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
2076        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
2077        global_ocean.90x40x15 global_with_exf global_ocean_pressure
2078        inverted_barometer solid-body.cs-32x32x1
2079      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
2080    
2081    checkpoint48d_post
2082    o in preparation for r*:
2083     a) use pre-computed gradient of hydrostatic potential:
2084        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
2085     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
2086        => affects results of glob_oce_pressure (different truncation error)  
2087      update output.txt of ideal_2D_oce & global_ocean_pressure
2088    
2089    checkpoint48d_pre
2090    o in preparation for r*:
2091      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
2092      pass the 2 comp. of the grad. as arguments to momentum S/R.
2093      but for the moment, only used if it does not change the results.
2094    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
2095    
2096    checkpoint48c_post
2097    Modifications in treatment of initial flux forcing controls
2098    to avoid extra storing of flux fields.
2099    
2100    checkpoint48c_pre
2101    o Added tidal_basin_2d experiment (currently 1D!)
2102    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
2103    
2104    checkpoint48b_post
2105    o r* coordinate added in #ifdef NONLIN_FRSURF block.
2106     (modification to pressure gradient not yet implemented)
2107    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
2108      (for U & V) that are used for vertical advection of momentum.
2109    
2110    checkpoint48a_post
2111    o In preparation for r*, use temp. array to compute vertical transport
2112       in flux-form momentum pkg. => change results of few test-exp.
2113      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
2114                        lab_sea, natl_box & plume_on_slope
2115    
2116    checkpoint48
2117    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
2118    
2119    checkpoint47j_post
2120    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
2121    o moved adexch from forward_step to addummy_in_stepping
2122    o added exch in ctrl_map_...
2123    o aveFreq.=0. at end of cost_final to avoid overwrite in
2124      reverse checkpointing loop
2125    o Yet more changes in gmredi:
2126      * adgmredi_calc_tensor
2127        avoiding all recomputation of gmredi_slope_limit
2128      * adgmredi_x/y/rtransport
2129        added flag for excessive storing to avoid recomp. of
2130        u/v/rtans, dTdx/y/z
2131        -> this is not really necessary and very memory-consuming
2132      * adgmredi_slope_psi:
2133        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
2134      * gmredi_slope_limit
2135        re-activated full calculation of taperfct for case 'ac02'
2136    o updating verification/ adjoints of carbon, global_ocean.90x40x15
2137    
2138    checkpoint47i_post
2139    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
2140    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
2141      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
2142    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
2143    o gmredi: fix few bugs.
2144    
2145    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
2146    This will be a good checkpoint to plug into the ecco-branch.
2147    o few modif.'s to get latest version adjointed
2148      (mainly kick out code in ini_linear_phisurf)
2149    o modif's to run adjoint with exactConserv
2150    o case GM_BOLUS_ADVEC should be cleaned
2151      S/R gmredi_slope_psi should be cleaned
2152    o verification/carbon now has exactConserv=.TRUE.
2153    
2154    checkpoint47g_post
2155    o time-average AIM output: becomes independent from statvars time-average
2156      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
2157    o After TAF bug fix:
2158      Tested adjoint of gmredi package.
2159      Tests were done with checkpoint47 rather than with latest
2160      checkpoint47f_post since the latter is broken for the adjoint
2161      verification/carbon/ contains both ADM and TLM gradient checks.
2162    Here they are, before they get changed/lost/stolen.
2163    Mostly modif.'s to fix numerical sensitivities.
2164    Gradient checks OK for
2165    - GM_taper_scheme:
2166      * clipping
2167      * ac02
2168      * linear
2169      * glw91
2170      * dm95
2171      * ldd97
2172    - GMREDI_OPTIONS:
2173      * GM_VISBECK_VARIABLE_K
2174      * GM_NON_UNITY_DIAGONAL
2175      * GM_EXTRA_DIAGONAL
2176      * GM_BOLUS_ADVEC
2177    in conjunction with data.gmredi parameters to be checked in
2178    in a few minutes under verification/carbon/code/
2179    
2180    checkpoint47f_post
2181    Merging from release1_p10:
2182    o modifications for using pkg/exf with pkg/seaice
2183      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
2184        and SEAICE_EXTERNAL_FLUXES
2185      - pkg/exf CPP options EXF_READ_EVAP and
2186        EXF_NO_BULK_COMPUTATIONS
2187      - usage examples are Experiments 8 and 9 in
2188        verification/lab_sea/README
2189      - verification/lab_sea default experiment now uses
2190        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
2191    
2192    checkpoint47e_post
2193    o created a tag prior to creating a branch
2194    
2195    checkpoint47d_post
2196    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
2197      at the bottom boundary had an erroneous half slip boundary condition
2198    o added bottom drag and no slip boundary condition capabilities to
2199      oceanic pressure coordinates code
2200    o added new verification experiment global_ocean_pressure, this experiment is
2201      also described in the tutorial section of the manual
2202    checkpoint47d_pre
2203    
2204    checkpoint47c_post
2205    o Added a verification experiment for a global cubed-sphere ocean run
2206      -  verification/global_ocean.cubed32x32x30
2207      -  uses pkg/therm_seaice and pkg/bulk_forcing
2208    
2209    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
2210    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
2211      when using P-coordinate; only implemented for atmospheric config.
2212    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
2213      NOTES: requires option NONLIN_FRSURF to be "#define".
2214    o update advect_xz/results/output.txt (left from checkpoint44g_post)
2215    
2216    checkpoint47b_post
2217    Merging from release1_p9:
2218    o pkg/seaice
2219      - removed GOTO's and added taf directives
2220      - double precision constants to reduce the g77 (Linux)
2221        to F77 (SGI) differences reported in release1_p8
2222    o tools/genmake
2223      - added SGI options
2224    o verification/testscript
2225      - updated to that of checkpoint47a_post
2226    o verification/global_ocean.90x40x15/input/eedata
2227      - modified for SGI f77 compatibility
2228    o verification/lab_sea
2229      - added description of sea-ice model
2230      - added missing matlab routines
2231      - added test of thermodynamics parallelization
2232    
2233    checkpoint47a_post
2234    o new pkg: aim_v23
2235     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
2236       for now, keep the same surface forcing as before.
2237     - Part-Cell implemented into AIM; check that Heat & Water are conserved
2238     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
2239     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
2240    o add diagnostic of surface correction term in monitor output
2241    
2242    o bulk_force and therm_seaice
2243    - Two packages:  bulk_force (Bulk forcing)
2244      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
2245    - Earlier integration from Stephaine Dutkiewicz
2246      and Patrick Heimbach.
2247    - Two ifdef statements for compile time,
2248       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
2249    
2250    checkpoint47
2251    differentiable version of checkpoint46n_post
2252    o bug fix in quasihydrostaticterms
2253    o * "clean" adjoint code (in terms of extensive recomputations)
2254        can now be obtained for all GMREDI options (i.e. for
2255        - GM_VISBECK_VARIABLE_K
2256        - GM_NON_UNITY_DIAGONAL
2257        - GM_EXTRA_DIAGONAL
2258        - GM_BOLUS_ADVEC )
2259      * However, wrong gradient check problem remains unsolved.
2260      * New CPP options have been introduced for different
2261        tapering schemes
2262    o external_fields_load now part of differentiation list
2263    o pressure needs multiple storing;
2264      would be nice to have store_pressure at beginning or
2265      end of forward_step, e.g. by having phiHyd global (5-dim.)
2266      (NB: pressure is needed for certain cases in find_rho,
2267      which is also invoked through convective_adjustment).
2268    o recomputations in find_rho for cases
2269     'JMD95'/'UNESCO' or 'MDJWF' are OK.
2270    o #define ATMOSPHERIC_LOADING should be differentiable
2271    o ini_forcing shifted to begining of initialise_varia
2272    o Incorporating QNVS line search routines into MITgcm
2273      (this is separate code, and therefore not under pkg)
2274      lsopt/, optim/
2275    o Updated verification/carbon/
2276      - #define GM_VISBECK_VARIABLE_K
2277      - GM_taper_scheme    = 'ldd97'    
2278    
2279    checkpoint46n_post
2280    Merging from release1_p8:
2281    o verification/natl_box:
2282      updating new external_fields_load routine
2283    o New package: pkg/seaice
2284      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
2285      The sea-ice code is based on Hibler (1979-1980).
2286      Two sea-ice dynamic solvers, ADI and LSR, are included.
2287      In addition to computing prognostic sea-ice variables and diagnosing
2288      the forcing/external data fields that drive the ocean model,
2289      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
2290      The implied surface heat flux is then stored in variable
2291      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
2292      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
2293      non-local transport term.  Because this call precedes model
2294      thermodynamics, temperature under sea-ice may not be "exactly" at
2295      the freezing point by the time theta is dumped or time-averaged.
2296      N.B.: fairly large differences in accuracy occur across
2297            different platforms/compilers; comparison between
2298            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
2299            generated output gives:
2300       T           S           U           V
2301      C D M    c        m  s        m  s        m  s        m  s
2302      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
2303      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
2304      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
2305    
2306      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
2307    o GAD:
2308      - generated new common blocks to account for call of
2309        same gad routines with differing traceridentities
2310        (needed to modify tracerIdentity indices in GAD.h)
2311      - generated separate common blocks for case useCubedSphereExchange
2312        (Department of Futurology)
2313      - parameter lists to gmredi_?transport: added tracerIdentity
2314      - added new key indices to tamc.h
2315    o external_fields_load:
2316      - added this routine to TAF list
2317      - needed to make some common blocks global and additional storing
2318        along the same lines as exf package (checkpoint_lev?_directives.h)
2319    o exf:
2320      updated external forcing package
2321      - bug fixes carried over from ecco-branch
2322        (missing OBCS_OPTIONS.h in two routines)
2323      - enable easy to use "no forcing".
2324      - added exf I/O for atmospheric loading
2325      - added exf I/O for runoff data
2326      - transfered scaling between exf <-> MITgcm to exf namelist
2327    o Adding new verification experiment global_with_exf.
2328      This verification experiment is almost identical to the
2329      global_ocean.90x40x15 experiment, except that it uses
2330      the exf (and cal) package instead of the
2331      external_fields_load routine (cf README file).
2332    
2333    checkpoint46m_post
2334    o modified testscript to return -- when there are no lines of "%MON" output
2335    o added new flag "quasiHydrostatic" for QH mode
2336      and new routine quasihydrostaticterms()
2337    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
2338      New routine: mom_u_coriolis_nh()
2339    o fixed sign of non-hydrostatic metric terms in u and v equations.
2340      Depend on correct sign of gravitySign.
2341    o added work.pc* to .cvsignore in aim directories using ifc
2342    o introduced flag for controllin non-hydrostatic metric terms
2343    o removed gravitySign from PARM04
2344    o switched to g77/ifc from pgf77 in aim experiments
2345    
2346    checkpoint46l_post
2347    o made convective adjustment work with pressure coordinates:
2348     - changed the direction of k-loop in convective_adjustment.F for the
2349       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
2350     - adjusted the reference pressure k-index in convective_adjustment.F
2351     - adjusted the convection condition in convect.F (in analogy to
2352       calc_ivdc.F)
2353     - convective_adjustment no longer computes anything on the halos
2354     - removed the warnings about negative salinity from find_rho.F and
2355       find_alpha.F; instead the new routine look_for_neg_salinity, called
2356       at the beginning of find_rho, find_alpha, and find_beta, does a
2357       check of the entire slice, if CPP-option
2358       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
2359    checkpoint46l_pre
2360    
2361    checkpoint46k_post
2362    o fixed the verification/global_ocean.90x40x15 experiment:
2363     - new bathymetry (the world according to A., JMC, and M.)
2364     - new initial fields and forcing fields (*.bin files)
2365     - new POLY3.COEFFS (for the next release one should switch to a full
2366       equation of state: JMD95P or MDJWF)
2367     - fixed several errors and redundancies in the data file
2368     - experiment uses looped cells
2369     - added matlab directory with diagnostic scripts for plotting of output
2370    
2371    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
2372     - read AIM physics parameters from a file (data.aimphys)
2373     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
2374    
2375    checkpoint46j_post
2376    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
2377    o move wVel computation at the end of the time step, in S/R integr_continuity
2378    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
2379    o update timeave pkg for wVel diagnostic.
2380    checkpoint46j_pre
2381    
2382    checkpoint46i_post
2383    o Clean up AIM package (and keep the results unchanged):
2384      include CPP_OPTION and use IMPLICT NONE in all routines ;
2385      declare all the variables _RL ; use _d 0 for all numerical constants.
2386      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
2387    
2388    checkpoint46h_post
2389    o cleaned up the use of rhoNil and rhoConst.
2390      - rhoNil should only appear in the LINEAR equation of state, everywhere
2391        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
2392        and the dynamical equations are all divided by rhoConst
2393    o introduced new parameter rhoConstFresh, a reference density of fresh
2394      water, to remove the fresh water flux's dependence on rhoNil. The default
2395      value is 999.8 kg/m^3
2396    o cleanup up external_forcing.F and external_forcing_surf.F
2397      - can now be used by both OCEANIC and OCEANICP
2398    checkpoint46h_pre
2399    
2400     Added code to convert surface volume flux (fresh water) into
2401     a mass flux when using P coordinates in the ocean (OCEANICP).
2402     Note: It assumes you have set rho0=rhoConst=density of fresh water.
2403    
2404    checkpoint46g_post
2405    o Include a new diagnostic variable phiHydLow for the ocean model
2406      - in z-coordinates, it is the bottom pressure anomaly
2407      - in p-coordinates, it is the sea surface elevation
2408      - in both cases, these variable have global drift, reflecting the mass
2409        drift in z-coordinates and the volume drift in p-coordinates
2410      - included time averaging for phiHydLow, be aware of the drift!
2411    o depth-dependent computation of Bo_surf for pressure coordinates
2412      in the ocean (buoyancyRelation='OCEANICP')
2413      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
2414        Theta, Salinity, and Pressure in the parameter list. This routine is
2415        presently contained in find_rho.F. This routine does not give the
2416        correct density for 'POLY3', which would be a z-dependent reference
2417        density.
2418    o cleaned up find_rho
2419      - removed obsolete 'eqn' from the parameter list.
2420    o added two new verification experiments: gop and goz
2421      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
2422    checkpoint46g_pre
2423    
2424    checkpoint46f_post
2425    o Enable tangent linear (forward mode) gradient checks:
2426      - extended active file handling to g_... files
2427      - added TANGENT_SIMULATION to theSimulationMode
2428      - extended grdchk package accordingly
2429    o added tangent linear setup in verification/carbon/code_ftl
2430    o added adjoint setup in verification/front_relax/code_ad
2431    
2432    checkpoint46e_post
2433    o Added new equation of state -> MDJWF
2434      - EOS of McDougall et al., 2002, JAOT, submitted
2435      - caveat: the equation of state is only valid for a smaller (more
2436        realistic?) range of values than JMD95P/Z and UNESCO
2437      - added masks to the calculation of pressure in store_pressure
2438      - added more check values for density in check_eos (ini_eos.F), some of
2439        the old check values are out of the range of the MDJWF-eos, so don't
2440        expect perfect matches for those
2441    checkpoint46e_pre
2442    
2443    checkpoint46d_post
2444    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
2445      'OCEANICP', also initialised field pressure correctly in ini_eos in the
2446      case of pressure coordinates. eosType='JMD95Z' in
2447      combination with buoyancyRelation='OCEANICP' now causes an error.
2448    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
2449      in find_alpha/beta.
2450    checkpoint46d_pre
2451    
2452    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
2453      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
2454    
2455    checkpoint46c_post
2456    o Changes necessary for ocean in p-coordinates
2457     -  Added new buoyancy relation = 'OCEANICP'
2458     -  Added new parameters = gravitySign (this used to be contained inside
2459        the factor dRdZ which I added when we first switched to R coordinates).
2460     X GM/Redi is not compatible (yet)
2461     X bottom drag and no-slip need to be debugged.
2462    checkpoint46c_pre
2463    
2464    checkpoint46b_post
2465    o Added new equation of state -> JMD95Z and JMD95P
2466      - EOS of Jackett and McDougall, 1995, JAOT
2467      - moved all EOS parameters into EOS.h
2468      - new routines ini_eos.F, store_pressure.F
2469    o Added UNESCO EOS, but not recommended because it requires
2470      in-situ temperature (see JMD95)
2471    o Modified formatting for knudsen2.f in utils/knudsen2 and added
2472      unesco.f to be used with POLY3
2473    checkpoint46b_pre
2474    
2475    checkpoint46a_post
2476    o Added (atmospheric) pressure loading
2477      - new field in FFIELDS.h, etc...
2478      - new cpp flag ATMOSPHERIC_LOADING
2479    o Changed hFacC to _hFacC in calc_phi_hyd.F
2480    o Added SHORTWAVE_HEATING to some files for consistency
2481    checkpoint46a_pre
2482    
2483    checkpoint46
2484    further merges from release1_p5
2485    o new ctrl package
2486      - adopted from ECCO environment to enable optimization
2487      - added Eliassen Palm fluxes to controls
2488    o added Eliassen Palm flux controls to gradient check package
2489    o cost package
2490      - Compatible with new ctrl package
2491      - added Eliassen Palm cost hooks
2492      - modif's of existing cost functions
2493    o Adjoint-related bug fixes in kpp:
2494      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
2495      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
2496    o autodiff package
2497      - flow directives:
2498        + new for S/R do_the_model_io
2499        + enhanced for S/R checkpoint
2500        + new gmredi.flow
2501      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
2502        disable adcommon.h/g_common.h by default.
2503      - fixed problem for adjoint of global_max
2504    o modified verification/carbon/
2505    o New setup for adjoint of global_ocean
2506    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
2507    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
2508    o incorporated hooks for sponge layer code (external_forcing.F)
2509    
2510    checkpoint45d_post
2511    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
2512    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
2513      (affects plume_on_slope "cg2d" output)
2514    o add new parameter deltaTfreesurf for free-surface time stepping
2515    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
2516    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
2517    o change phiMin in exp1 (to agree with documentation)
2518    o add new flags:
2519     - T,S forcing inside/outside Adams-Bashforth
2520     - turn off temp,salt advection and/or forcing
2521     - for each tracer, define internal flag for multiDimAdvection & A-B
2522    o monitor: change definition of KE to check conservation of Energy
2523    
2524    checkpoint45c_post
2525    o Removed f90 comments ("!")
2526    o Modified initialisations to enable exf package for MITgcm
2527      (without invoking ECCO_PACKAGE).
2528    o modifications to gradient check package (Martin Losch)
2529      - enable centered differences
2530      - modified format of standard output
2531    
2532    checkpoint45b_post
2533    o cleaned exchange calls in cg2d
2534    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
2535    o included CPP option SINGLE_LAYER_MODE in thermodynamics
2536      to configure barotropic setup (Martin Losch)
2537    o moved some initialisations within bi,bj loop in dynamics
2538      (TAF flow dependency)
2539    o in initialise_varia, moved call packages_init_variables
2540      before convective_adjustment_init
2541      (corresponding adjustment of TAF tape initialisation).
2542    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
2543    
2544    checkpoint45a_post
2545    o compute Rho over the whole domain (extend iMin,jMin indices)
2546    o specific exchange for X-slice domain (case Ny=1)
2547    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
2548    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
2549    
2550    checkpoint44h_post = checkpoint45
2551    o Fix to restore differentiability:
2552      place at which packages_init_variables is called in
2553      initialise_varia is crucial for reverse control flow.
2554    o modifications in GMRedi to enable stable adjoint
2555      (corresponding modif's in thermodynamics, dynamics)
2556    o added missing hook for sponge layer code in external_forcing
2557    o modified test cost functions
2558    o storing in gad_advection (plus removal of write(0,*)!
2559    o missing headers TR1.h added in convective_adjustment routines
2560    o errorMessageUnit set non-equal zero in eeboot
2561      (conflict on some platforms, e.g. IBM SP3)
2562    o modified carbon verif.
2563    
2564    checkpoint44h_pre
2565    o vertical grid option: allow to put the Interface at the middle between
2566      2 cell-centers ; replace delZ in pkg/kpp by drF.
2567    o GM Advective form: Tracers are advected using the residual transport (=
2568      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
2569    
2570    checkpoint44g_post
2571    o fix surface correction term in multiDimAdvection (affects plume_on_slope
2572      results) ; ifdef missing in thermodynamics.F
2573    
2574    checkpoint44f_pre,checkpoint44f_post
2575    o added PTRACERS package
2576      This allows an arbitrary number of passive tracers to be integrated
2577      forward simultaneously with the dynamicaly model.
2578      + Implemented so far:
2579        - basic forward algorithm (time-stepping, advection, diffusion, convection)
2580        - I/O and checkpointing
2581        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
2582      + Not implemented so far:
2583        - KPP
2584        - OBCS
2585      + No specific example supplied (yet) but global_ocean.90x40x15 has the
2586        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
2587        line in data.pkg.
2588      + This package is disabled by default since it increases storage.
2589    
2590    
2591    o testscript: added -cleanup option
2592    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
2593                 b) enable to filter 2D fields.
2594    
2595    checkpoint44e_pre,post
2596    o re-wrote convective adjustment to use pre-calculated weights
2597      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
2598      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
2599      Original calls to convect() still in place.
2600    
2601    chkpt44d_pre,post
2602    o added missing EXCLUDE_MONITOR flags
2603    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
2604      (incompatible typ in MIN/MAX expressions caused problems
2605      on IBM SP3)
2606    o in genmake added variable MAKEDEPEND
2607      plus resetting for case SunOS
2608    o added timer_stats.c routine for IBM SP3
2609    o removed variables in dynamics
2610    !!! I forgot to create tag chkpt44d_pre !!!
2611    !!! But chkpt44d_pre = chkpt44c_post    !!!
2612    
2613    o real fresh water flux implemented with non-linear free-surface.
2614    
2615    chkpt44c_pre,post
2616    o few fix (mask in shap_s2, EmPmR in external_field_load,
2617      USE_NATURAL_BCS in solve_for_P);
2618    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
2619    
2620    checkpoint44b_pre/_post
2621    o merge of relevant stuff from the ecco-branch:
2622      - genmake: removed $S64 overwrite for case SunOS
2623      - pkg/exf: update and corrections for field swapping and obcs
2624      - pkg/ecco: parameter lists for the_model_main, the_main_loop
2625                  harmonized between ECCO and MITgcm
2626      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
2627                      updated checkpointing_lev... lists for obcs
2628      - model/src: minor changes in forward_step, plot_field
2629                   added directive for divided adjoint in the_main_loop
2630      - pkg/mdsio: added mdsio_gl_slice
2631    
2632    o check parameters & config (chkpt44a_pre,post)
2633    o OBC and NonLin_FrSurf.
2634    
2635    checkpoint44
2636    o fix bug in mom_vi_del2uv
2637    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
2638    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
2639    o update AIM experiments (NCEP input files)
2640    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
2641    o added some stuff for AD
2642    
2643    checkpoint43
2644    o added two new advection tests
2645    o added global 4x4 degree ocean test
2646    o added test of H&S94 with free surface on cube
2647    o some final mods for gradient check, adjoint,...
2648    
2649    checkpoint42
2650      Fixed AD-related problems:
2651    o Store directives up-to-date with re-arranged Adams-Bashforth
2652      (mainly thermodynamics.F)
2653    o New store directives for multi-dim. advection schemes
2654      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
2655      * new common block and key passkey
2656      (mainly gad_advection.F)
2657    o Modified store directives for split of dynamics/thermodynamics
2658      for the case ALLOW_KPP
2659    o Cleaned argument list for timestep_tracer.F
2660    
2661    checkpoint41
2662    o re-formatted/added comments in prologues of key subroutines
2663      to work with protex
2664    
2665    checkpoint40
2666    o moved calc_gs, calc_gt and calc_tr1 back to model/src
2667    o added FLT (floats) package from Arne along with demo. experiment
2668    o re-arranged Adams-Bashforth scheme for tracers to allow easier
2669      implementation of forward-in-time forcing terms
2670    o more mods for non-linear free-surface including new variable
2671    o modified multi-dim method to work on cube
2672    o bug fix in KPP (from DM)
2673    
2674    checkpoint40pre9
2675    o added DST advection schemes
2676    o fix MPI bug on SGI's
2677    o modifications for non-linear free-surface
2678    o fixed conditionals for fixed flow/passive tracer only mode
2679    o added tension/strain form of stress tensor
2680    o changes to commenting of arguments for TAF/TAMC
2681    o added/updated many matlab scripts
2682    o added multi-dimensional advection method for tracers
2683      
2684    checkpoint40pre8
2685    o new package rw/
2686      Added method for dumping intermediate local arrays:
2687      mdsio_writetile - same as mdsio_writefield except works from inside
2688                        bi,bj loop
2689      mdsio_writelocal - same as mdsio_writetile except works for local
2690                         arrays
2691      write_local_r? - higher-level wrapper for mdsio_writelocal
2692      Controlled by diagFreq. Defaults to zero (ie. no dumps)
2693      Example given at end of mom_vecinv.F that dumps some local arrays.
2694    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
2695      control flux-form versus vector invariant code.
2696      Switch is runtime flag vectorInvariantMomentum (defaults to false)
2697      or genmake -DISABLE ...
2698    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
2699      (additional storing is now needed for case vecinv;
2700      currently nothing implemented to switch this storing off
2701      in case fluxform is used since no CPP flag available).
2702    
2703    checkpoint40pre7
2704    o bug fix in dynamics.F
2705      calc_viscosity called before k=1,Nr loop.
2706    o added some #ifdef's ALLOW_PASSIVE_TRACER
2707    o cleaned initialisations in ctrl_map_ini
2708      related to TAF
2709    
2710    checkpoint40pre6
2711    o split dynamics into thermodynamics & dynamics
2712    o corresponding split of calc_diffusivity into
2713      calc_diffusivity, calc_viscosity
2714      (kpp_calc_diff, kpp_calc_visc).
2715    o Added diffkr, kapgm to control variables
2716    o bug fix in gmredi_slope_limit for ldd97
2717    
2718    checkpoint40pre5
2719    o proper initialization of Adams-Bashforth time stepping
2720      + uses forward step for very first step of model (iter=0)
2721    o re-generated *all* output since almost all output is modified by this
2722      change (sorry but we've been putting this one off for about 2 years)
2723      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
2724        *not* regenerated since they are already out of date and I don't
2725        want to create the impression that they are suddenly working.
2726    o removed KAP stuff for DEC's
2727    o modified/added many .cvsignore files in */code and */input
2728    o added new expt "solid-body.cs-32x32x1"
2729      + this uses an alternative form of ini_curvilinear_grid.F which
2730        is not necessarily any better than the current one...
2731    
2732    checkpoint40pre4
2733    o added re-initialisations of utrans,vtrans,rtrans in
2734      calc_common_factors which are crucial for TAF.
2735    o extended iMin,jMin range for calc_common_factors,
2736      calc_diffusivity
2737    o added option ALLOW_PASSIVE_TRACER
2738    o a few minor updates and fixes
2739    
2740    checkpoint40pre3
2741    o created calc_gtr1.F for gad package
2742    o split the_main_loop and re-introduced forward_step
2743    o some recomputations of nIter0 for TAMC
2744    
2745    checkpoint40pre2
2746    o Updated to latest branch of AJA, JMC
2747    o Added gradient check package
2748    o Added routines for passive tracer handling
2749    o Added carbon sequestration sensitivity experiment
2750    
2751    checkpoint39
2752     o Modifications and fixes to support TAMC
2753       (mainly missing or wrong directives)
2754     o Corrected common blocks when fooling TAMC to produce adjoint I/O
2755       in addummy_in_stepping
2756     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
2757     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
2758     o Included following packages:
2759       cal: calendar
2760       exf: external forcing
2761       ecco: essential routines to control use of cal, exf
2762             (NB: this is not the full ECCO environment)
2763     o disabled some packages by default in genmake
2764    
2765    checkpoint38
2766     o see notes_c37_adj.txt
2767     o corrected wrong layer index in external_forcing_t
2768     o replaced the_main_loop/forward_step by the_main_loop
2769     o removed forceoutput from write_state
2770       (replaced criteria for initial/final state)
2771     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
2772    
2773    checkpoint37
2774     o mdsio.F routine split and packaged in pkg/mdsio
2775       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
2776        used unless genmake -disable=mdsio)
2777     o allow a more precise surface-geopotential gradient for the atmosphere
2778       taking into account the change in space of Alpha (=1/rho) at the surface.
2779     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
2780       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
2781     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
2782       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
2783       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
2784     o Time-Average diagnostics defined as a pseudo package "timeave".
2785     o pickup files : old pickup (before c35) did not work with new code (c35
2786       and after) unless activating 2 commented lines in initialise-varia.
2787     o Non-Hydrostatic pickup file Pb fixed.
2788     o bug with Rigid-lid version (since c35) fixed.  
2789    
2790    checkpoint36
2791     o implement Crank-Nickelson barotropic time-stepping
2792     o recover Time-Average diagnostics
2793     o fix Pb in checkpoint (PR#19)
2794     o AIM become a standard package ; clean unused CPP_kees
2795    
2796    checkpoint35
2797     o subtantial rewrite of dynamics.f
2798     o allows staggered time-stepping
2799     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
2800     o added bottom drag (linear + quadratic)
2801    
2802    checkpoint34
2803     o Modified exchange routines for correct reverse simulation.
2804     o Added verification output to comply with bug fix in impldiff.F
2805       as of c33 (exp2, natl_box).
2806     o Corrected store directives in dynamics.F
2807     o Corrected array boundaries in impldiff.F
2808     o Corrected array dimensions in gmredi.
2809       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
2810     o Added routine GLOBAL_SUM_INT to global_sum.F
2811     o Added mdsio_gl.F for ECCO purposes.
2812    
2813    checkpoint33
2814     o Fixed bug in lower BC in impldiff.F
2815     o Fixed confusion about units of forcing arrays in FFIELDS.h
2816       namely Fu,Fv,Qnet,Qsw,EmPmR:
2817       - Removed verification/natl_box/code/external_fields_scale.F
2818         (did not differ from that in model/src)
2819       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
2820         (see FFIELDS.h for description)
2821       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
2822         kpp_calc.F and kpp_transport_t.F
2823       - Removed model/src/external_fields_scale.F and calls to it
2824       - verification/natl_box uses flux data with "atmospheric" sign so
2825         a special version of external_fields_load.F is used to
2826         change the data as it's read in. This way, the arrays
2827         have the right units and signs at all times tha a user could
2828         possibly use them.
2829     o Corrected genmake to delete a temporary file during configuration
2830    
2831    checkpoint32
2832     o Scaling of forcing fields moved from external_forcing.F to
2833       external_fields_scale.F, called directly after loading fields.
2834     o Surface relaxation terms added to surface tendency fields in
2835       extra subroutine.
2836     o impldiff.F changed to avoid storing by TAMC of huge intermediate
2837       fields.
2838     o Changes in GMRedi to comply with packaging structure.
2839     o Modifications and bug fixes in KPP package.
2840     o Verification experiment for KPP added (verification/nat_box/)
2841    
2842    checkpoint31
2843     o Packages interface brought in line with defined standard
2844       -> new routines packages_...F
2845       -> changes in initialise_fixed.F, initialise_varia.F
2846       -> enables initialisation interface for ECCO package
2847     o Rescaling of external forcing fields immediately after read
2848       (removed from external_forcing.F)
2849       -> new: surface_fields_scale.F
2850       -> affects ini_foorcing.F, external_fields_load.F
2851     o Computation of surface tendencies before tendency updates.
2852       -> new: external_forcing_surf.F
2853     o Change of variable names useGMRedi, useKPP, useECCO
2854     o Further changes in dynamics.F, impldiff.F for TAMC
2855     o Tested for experiments 0, 2, 4.
2856       - not yet tested for GMRedi.
2857       - not yet tested for KPP.
2858    
2859    checkpoint30
2860     o Updates for OBCs
2861     o New experiment for test OBCs (internal_wave)
2862     o New output.txt in verification/exp4/results/
2863     o Updates for KPP: calculation of viscosity corrected, new variables
2864       kpp_dumpFreq and kpp_taveFreq
2865     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
2866       and entry for T90 in genmake
2867    
2868    checkpoint29
2869     o packaged KPP and GM/Redi
2870    
2871    checkpoint28
2872     o Corrected initialization of hFacMin for difference vertical coordinates
2873     o Modified calculation of partial cell thickness to more robust algorithm
2874     o config_summary.F: replaced write_1D_... by write_0D_...
2875       read_write.F: added subroutines write_0D_...
2876     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
2877       included some initialisations required for TAMC.
2878     o routine calc_isoslopes: modified sqrt computation to make it
2879       differentiable for zero argument.
2880     o routines dynamics, impldiff:
2881       included store directives and tape key computations required for TAMC.
2882     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
2883    
2884    checkpoint27
2885     o fixed calc_isoslopes() to so that cancellation of terms in tensor
2886       formulation works properly with variable resolution.
2887     o restructured the calling tree between the_model_main() and dynamics()
2888     o split initialise() into initialise_fixed() and initialise_varia()
2889     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
2890       in new routine ini_psurf()
2891    
2892    checkpoint26
2893     o moved some #ifdef in optional routines to encompass everything
2894       except the argument declarations. This was using up some memory.
2895     o fixed macros like _ADT to work with both versions of Linux cpp
2896     o cleaned up some unused and uninitialized variables
2897       (helps when debugging with strict compile options)
2898     o split up CPP_EEOPTIONS.h into options and macros
2899       (macros are now in eesupp/inc/CPP_EEMACROS.h)
2900     o patch for 2 processor JAM mode
2901    
2902    checkpoint25
2903     o updates for OBCs and NH
2904     o dramatically reduced memory usage
2905     o added "JAM" routines for use on Artic network
2906     o parameterization of convection by implicit vertical diffusion
2907     o added a diagnostic of convective index
2908     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
2909       (this is was partly for OBCs and NH but also in anticipation of
2910        an explicit free-surface option)
2911     o initial state input files for U and V
2912    
2913    checkpoint24
2914     o Removed some spurious "REAL"s
2915     o Updated KPP to latest version from JPL
2916     o Added a COS(latitude) in horizontal viscosity
2917    
2918    checkpoint23
2919     o Added del^4 diffusion for salt and temperature
2920     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
2921    
2922    checkpoint22
2923     o Made many small changes: implicit none, format(i5), etc...
2924     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
2925    
2926    checkpoint21
2927     o Introduced new I/O package that supports direct-access records (mdsio.F)
2928     o Split-up mid-level I/O routines
2929     o Updated input data for experiments 0,1,2,4 and 5
2930     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
2931    
2932    checkpoint20
2933     o Tidied up open-boundaries some more
2934     o Added non-hydrostatic code
2935     o Fixed some input data
2936     o Modified MPI start-up to work in "coupled" context.
2937    
2938    checkpoint19
2939     o Tidied up directory structure for verification experiments.
2940     o Added new code for open boundaries.
2941     o Corrected advective terms near boundaries.
2942     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
2943     o Implemented free-slip/no-slip BCs and del^4 dissipation.
2944     o Split default parameters out of ini_parms.F into set_defaults.F.
2945    
2946    checkpoint18
2947     o Further changes for optional code generation with
2948       CPP - ugh!
2949    
2950    checkpoint17
2951     o Beginning to incorporating modularity
2952       for supporting atmos. and ocean configs.
2953     o Small changes for TAMC complinace
2954     o New ultra simple test case. Barotropic box
2955       configuration "exp0".
2956    
2957    checkpoint16
2958     o Minor changes to exchange routines to support
2959       accumulation in reverse mode. Adjoint of an
2960       assignment is an addition.
2961     o Changes to support compilation by TAMC (LR(1)
2962       syntax) and by g77 under Linux ( 72 character
2963       limit ).
2964    
2965  checkpoint15  checkpoint15
2966   Rewrote exchange routines to allow   Rewrote exchange routines to allow
2967   o General tile <-> tile connectivity.   o General tile <-> tile connectivity.

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