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revision 1.17 by cnh, Mon Nov 30 16:46:45 1998 UTC revision 1.491 by edhill, Wed May 25 04:03:09 2005 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 for mnc output, fill the 'T' coordinate var with myTime and create a
8      separate 'iter' variable for iteration count
9    o pkg/diagnostics:
10      add new capability: output of Global/Regional & per-level statistics ;
11      tested against monitor output (including land & thSIce) on various exp.
12    o make seaice-pkg I/O type flags (MNC/MDS) more standard.
13    
14    checkpoint57h_done
15      tag after changing user customized files (DIAGNOSTICS_SIZE.h,
16      data.diagnostics, data.gchem, data.ptracers) is done.
17    
18    o pkg/diagnostics: prepare for Global/Regional statistics.
19      add 2nd namelist in data.diagnostics and update DIAGNOSTICS_SIZE.h
20    o remove "baseTime" (no used) from arg. list of DIFF_BASE_MULTIPLE
21      and rename it: DIFFERENT_MULTIPLE
22    
23    checkpoint57h_post
24    o move tIter0 from data.gchem to PTRACERS_Iter0 in data.ptracers
25    o pkg/diagnostics: change output frequency, now in seconds (instead
26      of Nb of iterations). This requires to change data.diagnostics.
27    checkpoint57h_pre
28    
29    o in mnc, let the user create the output dir if both mnc_outdir_date
30      and mnc_outdir_num are false
31    o add fflags() to pkg/diagnostics which allows one to specify, on a
32      per-file basis, the file precision [default behavior is unchanged]
33    o added diagnostics to pkg/kpp, including computation of mixed layer
34      depth based on a temperature/density criterion
35    o updated verification/natl_box to test the new pkg/kpp diagnostics
36    o bugs fixed (with useAbsVorticity=T & with useJamartMomAdv=T)
37    o test AB-3 code with 4th.Order advection scheme (advect_xy/input.ab3_c4)
38    o fix mnc flags in pkg/seaice so that they are "owned" by seaice,
39      not mnc -- this mistake was found by JMC and is now corrected
40    
41    checkpoint57g_post
42    o add Adams-Bashforth 3rd Order time stepping:
43      - default remains AB-2 (#undef ALLOW_ADAMSBASHFORTH_3)
44      - not yet implemented with NH, CD_Scheme, pTracers, MNC_pickup ...
45    checkpoint57g_pre
46    
47    o make lambda[Theta,Salt]ClimRelax spatially varying
48      (default remains spatially uniform constant based on tau)
49    o added new control variables
50      * init. uVel, vVel, etanN
51      * lambda[Theta,Salt]ClimRelax
52    o separate masks used for ctrl_pack/unpack 'from write_grid' output
53      (suggested by G. Forget)
54    
55    checkpoint57f_post
56    o add parameter "baseTime" = model base time = time at iteration zero
57      new function DIFF_BASE_MULTIPLE (replace DIFFERENT_MULTIPLE) to
58      account for baseTime shift
59    o move Coriolis arrays from PARAMS.h to GRID.h
60    checkpoint57f_pre
61    
62    o mnc-ifying the seaice package
63    o introduced an alternative length scale calculation for use in the limiting
64      maximum viscosity (off by default, see mom_vi_hdissip.F for details)
65    o S/R ptracers_calc_diff: argument list bug for CALL KPP_CALC_DIFF_S
66    o added modified Leith scheme with viscosity proportional to grad(Hdiv)
67      as well as grad(vort3).  Made it compatible with both approximate form
68      for the cubed sphere and full form of these gradients.  Added flag
69      useFullLeith to select between approximate and full form.  
70    o add "d0" in getcon.F to reduce differences between compilers/platforms
71      update output.txt of exp. fizhi-gridalt-hs
72    o change port_rand funtion to allow to set the seed.
73    o fix obscure MNC bug involving conversion between reals and integers
74      - it caused no problems with certain (eg. gcc, ifc) compilers but the
75        new version is now more standards-compliant
76    o adjoint-related modifications
77      * gad_dst3_adv_?: to be able to use advscheme=30 in adjoint
78      * gad_calc_rhs: fool adjoint, revert to advscheme=30 in reverse when using 33
79      * mom_vi_hdissip: to be able to use Leith scheme in adjoint
80    
81    checkpoint57e_post
82    o Adding eddy stress controls a la Ferreira et al.
83    checkpoint57e_pre (actually was tagged: eckpoint57e_pre)
84    
85    o fizhi pkg: fix AtoC and CtoA when called with same input & output array
86      update output.txt of exp. fizhi-gridalt-hs
87    o add more "Z" dimensions and associated coordinate vars to MNC
88    o pkg/exf: added twoDigitYear capability for option useExfYearlyFields
89    o parameter calendarDumps: when set, approximate months (30-31 days) and years
90      (360-372 days) for parameters chkPtFreq, pChkPtFreq, taveFreq, SEAICE_taveFreq,
91      KPP_taveFreq, and freq in pkg/diagnostics are converted to exact calendar
92      months and years.  Requires pkg/cal.
93    o diagnostics: add pickup functionality
94      - off by default for backwards compatibility
95      - current version only uses MDSIO -- MNC will be added
96    o allow to use pkg diagnostics for LAND pkg output & Shapiro Tendencies.
97    o pkg/shap_filt: fix for multi-tiles per face (CS-grid with EXCH2)
98    
99    checkpoint57d_post
100    o pkg/thsice used in the ocean: fix tile Pb related to sIceLoad forcing
101    o modify verification/ideal_2D_oce so that it tests the creation of mnc
102      output from the diagnostics package
103    o temporary fix in EXCH2_UV: add a 3rd call to fix the 24.tiles CS-grid set-up
104    o make genmake2 more portable by using ".$FS" instead of ".f" for more
105      of the test compilations (eg. IBM xlf on Mac OSX w/HFS filesys)
106    o add coordinate variables to the MNC output from the diagnostics package
107    o change MNC-flags default value: true when useMNC=TRUE
108    o add a "readgrid_mnc" flag to MNC and give model/src/ini_curvilinear_grid.F
109      the ability (off by default) to read the grid information using MNC
110    o lab_sea: use LSR_ERROR=1.E-12 for testing ; update output.txt
111    o diagnostics: fix a bug (sub-set of levels); keep full precision when averaging
112    o do snap-shot diagnostics at the middle of the time-interval (instead of
113      at the end).
114    o update exp. aim.5l_cs (use default LAND_OPTIONS.h file) and add
115      new test for AIM with thSIce + slab-ocean
116    o cpl_aim+ocn test: update output (optfile & default GMREDI_OPTIONS.h)
117    o move state variable diagnostics to the beginning of the time step ;
118      (note: still needs some work specially for snap-shot diagnostics)
119      duplicate & replace UVELVVEL diagnostics with UV_VEL_C & UV_VEL_Z
120    
121    checkpoint57c_post
122    o Change testing option (-ieee) to get closer agreement between g77 & ifort
123    o generate new output.txt files on faulks with g77 & the new -ieee option
124    checkpoint57c_pre
125    
126    o add "_d 0" in freeze ; change some "FLOAT" to "DFLOAT" and went back (TAF);
127      update output.txt of exp. global_ocean.90x40x15
128    o fix in ini_eos.F (one "_d 0" was missing): now g77 & ifc give much closer
129      results; update global_ocean_pressure & global_ocean.cs32x15 output.txt
130    o add saltFlux(+File) forcing capability with periodicExternalForcing
131    o allow to use pkg diagnostics for GM-Redi & ThSIce output
132    o diagnostics_fill: fill in up to sNx+1 or sNy+1 (if U,V or Z pt) for mnc.
133    o improvements for the MNC output from DIAGNOSTICS:
134      - correct handling of the unlimitied dimension
135      - all dims now have associated coordinate variables
136      - variables located at U, V, and Corner ("Z") points are now written
137        with the correct horzontal dimensions (eg. 'Xp1', 'Yp1') so that
138        *all* data points are output
139    o added seaice_summary.F and removed obsolete ALLOW_SEAICE's from pkg/seaice
140    o added pkg/seaice/seaice_monitor.F
141    o mdsio_readfield.F can now read files visible only to master MPI process.
142    o pkg/seaice: some test code for ice-modified ocean stress
143    o exf_getffields interpolation defaults to bilinear for all scalar forcing
144      fields (remains bicubic for wind velocity and stress).  This avoids, e.g.,
145      spurious negative numbers for precipitation and humidity.  Will cause
146      some small numerical differences for integrations using pkg/exf/exf_interp.F.
147    o pkg/ctrl/
148      * Add ctrlvec diagnostics in pack/unpack for nondimensional I/O
149        May be enabled via doPackDiag
150      *  introduce z-scaling of
151         + gradient (doZscalePack) and
152         + control (doZscaleUnpack)
153    o pkg/mdsio/
154      * enable useSingleCpuIO for state estimation (ctrl_pack/unpack) mdsio_gl.F
155      * N.B.: leave tiled I/O for tapelev (i.e. mds...vector)
156    
157    checkpoint57b_post
158    o simplify options in diagnostics_fill arguments (remove weird combinations)
159    o fix MNC coordinate variables so that they now contain per-face index
160      values (instead of xC,xG,yC,yG values) when run with EXCH2 since, in
161      general, EXCH2 grids are only aligned to a "local" coordinate system
162    o test diagnostics pkg in dic_example (no output) and ideal_2D_oce (with ouput)
163    o Implement instantaneous output within pkg diagnostics:
164      setting a negative frequency in data.diagnostics produces
165     "snap-shot" output (as opposed to time-average if freq > 0)
166    o move out off EQUIVALENCE all diagnostics that fizhi does not use ;
167      NOTE: change ptracer diagnostics name: use 2 characters to work with
168            more than 9 tracers. Add also diagnostics of advect & diffus flux.
169    o more CF compliance: convert all MNC 'iter' variables to 'T' so that it
170      becomes the coordinate variable for the 'T' dimension
171    o add CF-style coordinate variables to MNC
172      - just a first cut:  numbers are meaningless on the cubesphere and
173        missing along the T axis but otherwise it works!
174    o add surface flux diagnostics: TAUX, TAUY, TFLUX, TRELAX, TICE, SFLUX, SRELAX
175    o pkg/thSIce: read initial state from 6 files ; allow monitor to use MNC.
176    o add diagnostics of advective & diffusive flux for T & S (pTracers coming soon)
177      this is based directly on what the model compute, so that the content of
178      each diagnostics might be affected by switching options (e.g., implicitDiffusion)
179    o small changes for diagnostics (gad_biharm_?.F, arguments of S/R impldiff.F)
180    o clean up build options files for SunOS, in particular
181      - remove -traditional from xmakedepend
182      - change -xarch=v9 to -xarch=native for f77
183      - restore use of make (not gmake)
184      - add CC=gcc if using g77
185    o changes per discussion of AM, JMC, & EH3 today:
186      - move redundant "grid" variables out of "state" -- in preparation of
187        creating proper CF-style coordinate variables and in recognition
188        that any/all grid variables can be easily copied (eg. w/NCO) from
189        the grid files into any of the other NetCDF files
190      - *always* output grid variables with MDSIO (this will eventually be
191        changed)
192      - output MNC grid file if useMNC is true
193    o every instance of _END_MASTER() has been found and replaced with
194      _END_MASTER( myThid ) in order to satisfy certain picky Sun
195      preprocessors
196    o re-arrange diagnostics pkg initialisation:
197     - allow each package to extend the available diagnostics list
198     - add some checking and fix small problems (multi-threaded, ...)
199     - new S/R diagnostics_fill (replace fill_diagnostics):
200       look through the short list of active diag. (instead of the long list)
201       create function DIAGNOSTICS_IS_ON to tell if a diagnostics is active
202    
203    checkpoint57a_post
204    o this set of changes restores TAMC compatibility
205      tested for global_ocean.90x40x15 adjoint on trough
206      (what a pain)
207    
208    checkpoint57a_pre
209    o some modifs in tools/build_options for sunos
210    o call ctrl_pack for ctrl at end for optimcycle=0
211    
212    checkpoint57
213    o add horizontal bi-harmonic viscosity for vertical velocity
214      - new parameter viscA4W (defaults to viscA4)
215      - affects only non-hydrostatic code
216      - to be done: no-slip lateral boundary conditions
217    o switch back to "sflux = sflux - runoff" in exf_getforcing.F
218    o implement Implicit Vertical advection for pTracers
219    o depth convergence accelerator: replace deltaTtracer by dTtracerLev(k)
220      (implemented also for implicit vertical diffusion & advection)
221    o OBCS: extend application of tracer open boundary conditions
222      to a strip beyond the boundary of width Olx/Oly
223    o add call monitor to TAF set of required calls (flow directives)
224      and include in natl_box_adjoint
225    o untangle a few ifdefs related to cost, ctrl, autodiff
226      untangel a few ALLOW_ECCO_OPTIMIZATION
227    o Apply Cooper & Haines representative estimates also at sub-surface (k=Nr)
228      (theta2, salt2 in ecco_cost_weights)
229    
230    checkpoint56c_post
231    o OBCS as control variables
232      - update ctrl_ad_diff.list, obcs_ad_diff.list
233      - remove balance of obcs controls from default
234      - fix index bug nobcs in ctrl_init
235      - fix dummy fields filen in ctrl_pack
236      - add dummy weights for obcs
237    o lsopt: comment out fort.94 output
238    o optim:
239      - remove unnecessary header files
240      - adjusted namelists
241      - add xerbla.F to Makefile
242    o exf:
243      - multiple modifications of exf_check_range
244      - unit change in exf_init_runoff from [m/year] to [m/s]
245    o mdsio:
246      - i/o-vector change debugLevel from debLevA to debLevB
247    
248    checkpoint56b_post
249    o collect all ptracers output in an new routine (PTRACERS_OUTPUT) that
250      is called from DO_THE_MODEL_IO
251      - rename PTRACERS_STATV_WRITE to PTRACERS_WRITE_TIMEAVE
252      - introduce new parameter PTRACERS_dumpFreq (defaults to dumpFreq)
253      - clean up PTRACERS_WRITE_TIMEAVE a little
254    o add another verification experiment that tests both the cfc-pkg and
255      the gchem-pkg with GCHEM_SEPARATE_FORCING undefined, that is with
256      reactive tendencies treated inline with regular timestepping
257    o testreport previously did a lousy job of comparing small numbers, so
258      we (Ed and Martin) changed the  way the cut-off of 1.e-12 is
259      implemented in the little c-progam tmp_cmpnum.c which is embedded in
260      testreport.
261    o ptracers_monitor: bug fix for MPI
262    
263    checkpoint56a_post
264    o GCHEM: finish reorganizating the package
265      - forward_step calls GCHEM_CALC_TENDENDY, which computes gchemTendency
266        (introduces another 3D-array for each passive tracer, but only if
267        GCHEM_SEPARATE_FORCING is undefined. For GCHEM_SEPARATE_FORCING
268        gchemTendency is not needed because the timestep is done separately)
269      - gchemTendency is added to gPtr in GCHEM_ADD_TENDENCY
270      - GCHEM is now---more or less cleanly---separate from PTRACERS
271      - to bo done: handling of surfaceForcingPtr that is needed for KPP not
272        so clear to me how that should be done in a general way.
273    o CFC: improve formatting of output in CFC_ATMOS
274    o PTRACERS:
275      - rename GCHEM_MONITOR to PTRACERS_MONITOR and call it from MONITOR, so
276        that ALL experiments with ptracers enable can be checked. This makes
277        GCHEM_MONITOR obsolete.
278      - include a runtime parameter PTRACERS_monitorFreq that defaults to
279        monitorFreq
280      - set default PTRACERS_write_mdsio to false if PTRACERS_write_mnc is true
281    o add PTRACERS (PTR0[1-5]) to testreport output
282    o exf_check_range:
283      * default changed to .TRUE.
284      * will check values for niter0 if debLevA, every timestep if debLevB
285      * STOP in exf_check_range if 'out of range'
286      * range chosen generous to allow for potential extema
287      TBD: a version with stricter range
288           permitted range would be runtime parameters
289    o GMredi:
290      - fix ldd97 slope limit ; extend valid domain of Psi-Bolus ;
291      - change S/R GRAD_SIGMA to be valid in the overlap on CS-grid.
292      - change the default GMREDI_OPTIONS.h: compile everything except Visbeck
293    o GCHEM:
294      - move call to GCHEM_FORCING_SEP, so that it is now called before
295        the blocking exchanges to avoid computing halos in GCHEM_FORCING_SEP
296      - introduced a useGCHEM runtime flag and applied it everywhere.
297      - renamed PTRACERS_SEPARATE_FORCING to GCHEM_SEPARATE_FORCING;
298        this flag is now only visible within GCHEM-pkg routines.
299      - moved gchem_forcing_int temporarily into ptracers_forcing, this will
300        be replaced by a 3D array that is computed before thermodynamics; for
301        this, the tracer ID iTracer had to be included into the parameter list
302        of ptracers_forcing
303      - set up forward_step to call gchem_forcing, that will replace
304        gchem_forcing_int in ptracers_forcing
305      - cleaning up
306    o small cleaning of exch2: remove files that are also in eesupp/src
307    
308    checkpoint56
309    o AIM: read land-Fraction earlier (from ini-fixed) and monitor land at nIter0
310    o mnc: cleanup "full" files--fixes out-of-memory problem
311    o ECCO-GODAE
312      * model/, pkg/, code/, input/ now complete w.r.t. ECCO-GODAE production setup
313      * fully merged and updated from SIO code
314        windstress sign change affects
315        - exf_inscal_[u/v]stress
316        - sign of xx_tau[u/v] adjustments
317        - signs in cost_scat
318      * ctrl_get_gen: avoid update of tau[u/v] for first few days
319      * natl_box_adjoint updated and compressed
320      * 2-level checkpoint switch added
321        (tested in EXP. 1 of natl_box_adjoint)
322      * new switch doInitXX to avoid init. of xx_... in optimcycle=0
323    o SVD
324      * first complete, non-hacked version for SVD calculations
325      * all interfaces clean w.r.t to handling of xx_..., adxx_..., g_xx_...
326        performed via direct access files admtlm_vector.it????
327        (via ctrl_[un]pack)
328      * optimcycle is used for ARPACK iteration counter
329        (note: adxx_... is iterated, rather than xx_...; latter is constant!)
330      * EV problem ok w.r.t. L2-norm in tangent space; need to check other norms
331        and add linear transforms where necessary
332      * controls are initial/final SST, SSS (can be extended; need to check
333        ctrl_set_[un]pack_xyz.F according to ctrl_set_[un]pack_xy.F
334    o mdsio: filename info to both stderr, stdout
335    o exf: exf_inscal_runoff: separated default conversion [m/year] -> [m/sec]
336      from sign change
337    
338    checkpoint55j_post
339    o isolate dissipation tendency (allow to keep it out off AB) in V.I form.
340      affects (truncation level) output.txt of global_ocean.cs32x15(&.thsice)
341    o add consistent build directories and .cvsignore files to verification
342    o added viscA4GridMin and viscA4GridMax for more control on biharmonic viscosity
343    o make all subroutines 30 or less characters in length for certain older
344      compilers to work (a thorough search only turns up two routines in
345      pkg/ptracers)
346    o allow (vecinv only) a different horiz. viscosity for Divergence and Vorticity;
347      affects (truncation level) output.txt of global_ocean.cs32x15(&.thsice)
348    
349    checkpoint55i_post
350    o change arrays for total vertical diffusivity (2.D if explicit,
351      3.D if implicit) ; each ptracer uses its own background value.
352    o added mnc/NetCDF output capability to ocn_compon_interf
353      - added bits to verification/cpl_aim+ocn so that it can run on
354        ITRDA and other clusters without the mpirun "-wd" option
355    o fixed wayward endif in mom_fluxform.F that messed up cyclindrical
356      configuration
357    o give MNC the ability to create additional files rather than
358      exceeding a specified file size limit "MNC_MAX_FILESIZE"
359      - the default is just less than 2GB which is a practical limit
360        on many systems
361    o Compute the non-local term using either KPP vertical diffusivity (=default)
362       or the total vertical diffusivity (when KPP_ghatUseTotalDiffus=T)
363    
364    checkpoint55h_post
365    o add verification test "vermix"
366    o remove all the *_ioinc flags and replace with the single global
367      outputTypesInclusive flag
368    o allow to set a vertical profile of vertical diffusivity for T & S
369    o call PACKAGE_BOOT & PACKAGES_READPARMS just after INI_PARMS
370    o useMNC moved from data.mnc to data.pkg
371    
372    checkpoint55g_post
373    o Renaming carbon AD experiments to comply with testreport conventions
374    o Updating adjoint of Held-Suarez hs94.1x64x5
375    o Fixing directives for non-ECCO forward_step, after ECCO directives
376      have been fixed to avoid recomp. of do_oceanic_phys
377      Works well for global_ocean.90x40x15,
378      but recomp. issue remains for carbon
379    o Updating adjoint output for natl_box_adjoint after
380      pkg/ecco has been modified (see taga c55d_post)
381    
382    checkpoint55f_post
383    o rename to timeave_init_fixed
384    
385    checkpoint55e_post
386    o some delicate re-shuffle of store directives to avoid one
387      extra call of do_oceanic_physics
388      affects ecco_the_main_loop.F, do_oceanic_physics.F
389      checkpoint_lev1_directives.h
390    o NB: this may break global_ocean adjoint temporarily,
391      but it is clear how to fix it. Will do later, need this now.
392    
393    checkpoint55d_post
394    o ECCO specific cost function terms (up-to-date with 1x1 runs)
395    o ecco_cost_weights is modified to 1x1 runs
396    o modifs to allow observations to be read in as
397      single file or yearly files
398    o enable to read exf forcing fields as either
399      single file or yearly files (flag useExfYearlyFields)
400    checkpoint55d_pre
401    
402    o switch between 2-level and 3-level checkpointing
403    o add ability of MNC to write local and "partial" (eg. 2D slices where
404      the full 3D field is never actually stored) arrays to NetCDF files
405      with the correct (that is, the complete multi-dimensional) set of
406      array indicies
407      - used in mom_vecinv() to write the diagFreq output
408      - tested (demonstrated) in verification/aim.5l_cs
409    o further mnc-ification
410      - add verification/lab_sea to the list with mnc setups
411      - fix undefined mnc v-names in cd_code
412      - add kpp to mnc output (both snapshot and timeave)
413    o non-hydrostatic code
414      - added horizontal viscosity parameter viscAhW for w, that replaces viscAh
415        in calc_gw.F
416      - defaults to viscAh
417      - this is useful, when I want to use viscAh=0 (e.g., only biharmonic
418        friction or Leith) in non-hydrostatic mode, as long as there is
419        no biharmonic friction and/or Leigth or equivalent for vertical velocity.
420    o pkg/cost
421      extend simple cost functions to treat time mean quantities
422      (T,U,V) via cost_accumulate_state from cost_tile
423    o multidimAdvection on CS-grid: implement the full 3 pass ; overlap needs to
424        be 2 times larger than the minimum size the advection scheme requires.
425        now get a perfect conservation of salt in advect_cs test-exp (updated)
426    o GGL90 (Gaspar's TKE mixed layer)
427      - add horizontal diffusion of TKE, requires exchanges in
428        do_fields_blocking_exchanges, horizontal diffusivity is zero by
429        default. In OPA there is no horizontal diffusion of TKE but the
430        mixing coefficients are computed from a horizontal average of TKE of
431        6 points or so. I think that diffusion has a little more physical
432        justification.
433      - clean up ggl90_calc in the hope of reducing memory usage (this hope
434        was in vain)
435      - mask tke-variable in ggl90_init
436    o fix mask Pb in multidimAdvection on CS-grid (still a small Pb with ipass)
437    o fix biharmonic diffusion on CS-grid.
438    o more obcs stuff
439      - added obcs_external_fields_load as an alternative to the EXF-pkg option
440        for reading boundary values. This routine is called from
441        obcs_prescribe_read
442      - updated obcs_check
443      - changed sponge layer relaxation parameter units for days to seconds
444      - turned off sponge layer by default
445      - changed argument list of OBCS_CALC to myTime+deltaTclock
446      - fixed about 35 bugs in obcs_external_fields_load
447    
448    checkpoint55c_post
449    o obcs stuff
450      - new runtime flags useOBCSprescribe, useOBCSbalance
451      - re-arranged obcs_calc
452      - moved exf_getobcs to obcs_prescibe_read
453        obcs_prescibe_read is called after ORLANSKI stuff
454        and independent of it (executable can contain all).
455      - updated obcs_check
456      - added exchanges for U,V,gU,gV for useOBCSprescribe=.TRUE.
457        These may be necessary only if tangential velocities are
458        prescribed at OB, not sure, needs testing.
459    o make the MNC_CW_ADD_VATTR_* subroutines all take scalar arguments
460      which simplifies the calls and passes the ifc check-bounds test
461    
462    checkpoint55b_post
463    o add a 2D scalar, Z location, exchange_2 routine.
464    o EXCH_UV for CS-grid: add one u,v in the corner-halo region, allows
465      to compute vorticity on a wider stencil [e.g., vort3(0,1)&(1,0)]
466      affects advect_cs results (for the wrong reason): update output.txt
467    o use a more standard discretization for biharmonic viscosity ;
468     (original version still available with #define MOM_VI_ORIGINAL_VISCA4 )
469      affects results of dome set-up: update output.txt
470    o fix gad_advection.F (CubedSphere part), back to version 1.23
471    o fix bug in mom_vi_del2uv.F (CubedSphere part).
472    
473    checkpoint55a_post
474    o merged code to
475      * prescribe/read time-dependent open boundaries
476        (works in conjunction with exf, cal)
477      * sponge layer code for open boundaries
478      * each boundary N/S/E/W now has its own CPP option
479        (healthy for the adjoint)
480    
481    checkpoint55
482    o up-to-date adjoint of previous breaks
483      - natl_box_adjoint: problem for exp 12, 13: cost = 0. needs fix
484      - global_ocean_ebm: adjoint still needs fix (TLM ok)
485      - global_ocean.90x40x15: extended GMREDI_OPTIONS.h
486      - carbon: * remove tr1-related adjoint verification
487                * add ptracer as control variable
488    o remove all tr1-related code (ALLOW_PASSIVE_TRACER)
489      (adjoint stuff still has some tr1 'names', but all use ptracer arrays)
490    
491    checkpoint54f_post
492    o in verification/carbin/ remove experiment related to
493      ALLOW_PASSIVE_TRACER (array tr1 etc)
494      code_ad/ input_ad/ results_ad
495    
496    o add two new packages
497      - ggl90, TKE-model of Gaspar et al. (1990), Blanke+Delecluse (1993)
498        + subject to optimization (memory)
499      - opps, OPPS (ocean penetrative plume scheme) of Paluszkiewicz+Romea (1997)
500        + subject to reordering (many GOTOs in the original code)
501        + so far opps is called for every (i,j) point, and then operates in
502          the vertical; one may want to reorder the scheme in order operate in
503          horizontal slabs at the cost of (a lot of) memory, at least ten new 3D
504          fields)
505    o overhaul of IO so that we now have flags for MDSIO and/or MNC
506      - all verification tests compile and run with linux_ia32_g77
507      - defaults are compatible with current input files--nothing
508        should change if you were not previously using MNC
509      - MNC output has been added in numerous places (eg. timeave)
510        but there are still a few writes not yet do-able with MNC
511        (this is in progress)
512      - flags now allow for either/or/both use of MDSIO and MNC and
513        documentation will soon follow
514      - numerous small formatting cleanups for ProTeX
515    o add version info (via BUILD_INFO.h) to MNC and stdout
516    
517    checkpoint54e_post
518    o add two new packages
519      - pp81 (Packanowski and Philander, 1981), Richardson number and
520        stratification dependent mixing
521      - my82 (Mellor and Yamada, 1982) level 2 turbulence closure scheme
522      - these scheme operate in a similar manner as KPP (without ghat, of
523        course), however there is only one diffusivity that is used for both
524        temperature and salinity (and passive tracers)ç
525    o add offline package
526    o add "verification/dic_example" which contains a dic-gchem-ptracer setup
527      provided by Stephanie Dutkiewicz
528    o genmake2: add ability to search for C compilers and cleanup test output
529      - fixes recent SX-6 problems and should help with others (eg. HP-UX)
530    
531    checkpoint54d_post
532    o data.diagnostics: if levels() is unspecified then ALL levels are diagnosed
533    o bug fix in pkg/cal/cal_addtime.F for TheCalendar='model' day count is wrong,
534      leading to additional shift by 5 days each year of integration
535       (i.e. leading to considerable offset over the years)
536    o update global_ocean.cs32x15/thsice: use z* + RealFW + staggerTimeStep
537    o start with no AB and no initial filtering (staggerTimeStep):
538      change the results of test-exp: hs94.128x64x5, hs94.1x64x5 & hs94.cs-32x32x5
539    o move ocean specific S/R calls from forward_step.F to do_oceanic_phys.F
540      (external loading & cpl import/export stay in forward_step.F)
541    o update coupling interface to work with new staggerTimeStep
542    o change MDSIO ptracers_pickup.
543    o fix a bug in Flux deriv. vs Ts (pkg/aim_v23/phy_suflux_sice.F);
544    o genmake2 fixes so netcdf now works on halem ("osf1_alpha_*")
545    o bugs fixed in kpp_calc.F (ustarY) and external_forcing.F (Qsw & Partial-cell)
546    
547    checkpoint54c_post
548    o replace surfaceTendency U,V,S,T,Tice,Ptr by surfaceForcing U,V,S,T,Tice,Ptr
549      this affects (truncation error) output.txt of test-exp:
550       global_ocean_ebm,_pressure,.cs32x15(&.thsice), lab_sea & natl_box
551    o pkg/kpp: replace pMask by maskC to reduce memory size (one 3.D array)
552    o change Qnet to always be the net heat flux, (+upward).
553      affects (truncation error) output of natl_box exp.: updated
554    o define the max number of passive tracers in PTRACERS_SIZE.h
555    o start to test mnc routinely in exp0
556    o add sea-ice loading (sIceLoad) as a new forcing field.
557    
558    checkpoint54b_post
559    o add testreport "-j JOBS" option for parallel builds (tested and pretty
560       impressive on Altix and Opteron systems)
561    o diagnostics can now write NetCDF files through the mnc package
562    o staggerTimeStep & NLFS: update pkg aim_v23 & thsice; update aim.5l_cs output
563    o staggerTimeStep & multi-Dim-Advec: Exch(U,V) added
564    o staggerTimeStep & NLFS: rescale T & S surface tendencies.
565      affects (truncation error) output of lab_sea & natl_box exp.: updated
566    o change pickup _cd & _ptracers (old pickup restart: usePickupBeforeC54=.T.)
567    
568    checkpoint54a_post
569    o re-write staggerTimeStep: step fwd U,V and then T,S (reverse the order).
570    o change pickup file (to restart from old pickup, set usePickupBeforeC54=.T.)
571    o get a perfect restart when using RealFreshWaterFlux + NLFS (not finished)
572    o update output of all exp. that use staggerTimeStep (except hs94.cs & 2D)
573      + internal_wave (shift in writing cg2d_ini_res)
574    checkpoint54a_pre
575    
576    o require forcing_In_AB=.FALSE. and remove surfaceTendencyTice from pkg/seaice
577      - modified verification/lab_sea and natl_box_adjoint accordingly
578    
579    checkpoint54
580    checkpoint53g_post
581    o prepare splitting of thermodynamics: store convect.counter in common block
582    o store d.etaH/dt (instead of Div.hV) in common ; affects (truncation error)
583      output of: global_ocean.cs32x15, global_ocean_pressure & internal_wave
584    o cnh's modifs to gad_advection.F for cube-sphere multi-dim advection
585    o new parameter "nShapS": allow to treat differently S from T (nShapT)
586    o separate Vert.Advec.Scheme from horizontal Advec.Scheme (T & S)
587    o restore adjointability
588    
589    checkpoint53f_post
590    o modifications that affect AIM experiment results (update output.txt):
591      - no advection of S at top interface Nr (pkg/generic_advdiff)
592      - air surf. temp: use lower value between T0 & T1 (phy_suflux_prep.F)
593    o AIM pkg:
594      - include stability function into surf.Flux derivative relative to Tsurf
595      - calculate clear-sky radiation & surface temp. change (for diagnostics)
596    
597    checkpoint53e_post
598    o merged cylindrical coord configuration
599    o added rotating_tank experiment
600    checkpoint53e_pre
601    
602    checkpoint53d_post
603    o faulks upgraded: re-generate output.txt that have changed:
604       global_ocean.cs32x15(.thsice), global_ocean_ebm, lab_sea, natl_box
605    o Added Bryan and Lewis, 1979, vertical diffusivity profile
606    o pkg/land: fix problem in land_impl_temp.F when Ts arround freezing.
607    o added Sadourny discretization of Coriolis
608      - moved some PARAMETERS from mom_*_coriolis.F to PARAMS.h
609      - re-enabled use of omega3 (useAbsVorticity)
610    o added Leith (Phys. Fluids, 1968, 10, 1409-1416) variable viscosity for
611      vector-invariant equations
612      - note: does *NOT* yet use same variable visc. for no-slip BC's.
613    o recoded the lateral boundary conditions for non-hydrostatic w, this time
614      hopefully without new bugs
615      - still to do: biharmonic friction for non-hydrostatic w
616    o bug fix for mom_*_sidedrag: rA -> rAs,rAw
617    o regenerated output for global_ocean_ebm (using -ieee)
618    o fix mom_common/mom_*_sidedrag.F to recover numeric output prior to creation
619      of mom_common/
620      - simple re-arrangement of instructions within computing loop
621    checkpoint53d_pre
622    
623    checkpoint53c_post
624    o new version of coupler for AIM+thSIce and Ocean models
625     - new fields (SSS,h_MixLayer ...) are exchanged through the coupler
626     - land: change Evaporation of snow
627     - aim with thSIce: fix bug in snow-precip.
628    o changes to calc_gw.F
629     - bug fix for w^2 term near the bottom boundary
630     - (hopefully) improve the lateral slip boundary condtions for use with
631        partial/looped cells
632      - because the bug fix changes two verification experiments anyway (exp5
633        and plume on slope), change the lateral boundary condition from half slip
634        to the value of no_slip_sides
635    o ebm package wasnt quite up to the parallel task. Fixed that.
636    o Adjoint of EBM package + verification
637      * TLM OK
638      * ADM not sufficient accuracy yet (needs further testing)
639    
640    checkpoint53b_post
641    o Commiting new energy balance model to repository
642      * package is pkg/ebm
643      * verif. is verification/global_ocean_ebm
644      * references are in ebm_driver.F
645    C      * X. Wang, P. Stone and J. Marotzke, 1999:
646    C        Global thermohaline circulation. Part I:
647    C        Sensitivity to atmospheric moisture transport.
648    C        J. Climate 12(1), 71-82
649    C      * X. Wang, P. Stone and J. Marotzke, 1999:
650    C        Global thermohaline circulation. Part II:
651    C        Sensitivity with interactive transport.
652    C        J. Climate 12(1), 83-91
653    C      * M. Nakamura, P. Stone and J. Marotzke, 1994:
654    C        Destabilization of the thermohaline circulation
655    C        by atmospheric eddy transports.
656    C        J. Climate 7(12), 1870-1882
657    o Will need long integration testing.
658    checkpoint53b_pre
659    
660    o created pkg/mom_common in preparation for variable viscosity code
661    o renamed and split ini_mnc_io
662    o pkg/land: only liquid water can diffuse or run-off
663    o AIM using land: soil wetness availability account for snow
664    o added printMapIncludesZeros to EEPARMS namelist
665    
666    checkpoint53a_post
667    o restore TAMC compatiility for exf_constants.h
668      (no usage of _d in .h)
669    o Additional storing in KPP in an attempt to fix
670      TAMC problem with adjoint of KPP code.
671      (no success...)
672      Identical code works fine with TAF.
673    o Fixed verification/natl_box_adjoint experiments.
674      Initial conditions for Experiments 4 and 5 are now
675      set to "SEAICE_initialHEFF=0", which is more reasonable,
676      and hence gives results closer to that of Experiment 2.
677      Experiment 6 requires "SEAICE_initialHEFF=1" and is working once again.
678    
679    checkpoint53
680    o stable checkpoint with up to date adjoint
681      TLM tests only run for 1st grdchk at the moment. Its unclear if
682      this is a code problem or a problem with resetting code for g_
683      variables that is being autogenerated wrong.
684      Otherwise:
685       o code is testing well on Linux (P4 and AMD), SGI Alitix and Irix.
686       o IBM and HPQ tests could not be run because NCAR (IBM) and NCCS (HPQ)
687         are both still in chaos following their security messes.
688    
689    checkpoint52n_post
690    o various build (mostly genmake2) changes including:
691      - ability to build/run more easily within Cygwin and MacOS X
692      - more complicated Makefiles with a stronger dependence on Gnu Make
693    o pkg/seaice modifications
694      - added SEAICE_deltaTtherm and SEAICE_deltaTdyn in order to reduce cost
695        of pkg/seaice.  For time being, SEAICE_deltaTtherm = deltaTtracer
696        and SEAICE_deltaTdyn must be integer multiple of SEAICE_deltaTtherm
697      - changed proxy for geostrophic velocity and updated
698        verification/lab_sea/results/* accordingly
699      - removed ADI dynamic solver from pkg/seaice
700      - replaced all occurrences of 1/CSTICE or 1/CSUICE
701        they caused a segmentation fault under certain circumstances
702      - removed unused field WATR
703    o bug fix in exf-package:
704      -  u/vwind are defined at tracer/pressure points. The values of u/vwindmask
705         now reflect that.
706    o small fixes in the cal-package:
707      - set reference date to first of January for the 'model'-calendar
708      - failing of cal_CheckDate in cal_FullDate now actually results in a
709        warning
710    o small modifications in exf-package to increase flexibility:
711      - change climtempfreeze from a constant to a runtime parameter that
712        is specified in data.exf_clim (default = -1.9)
713      - introduce runtime parameter windstressmax (default = 2.0) that is
714        specified in data.exf
715    o fix in pkg/thsice:
716      - update Evap (Tsf changes) to be consistent with Latent heat flux
717      - maintain snow precipitation unchanged (even if Tsf >=0).
718     both affect global_ocean.cs32x15/(.thsice) results ; update output.txt.thsice
719    
720    checkpoint52m_post
721    o commented out call to cal_GetMonthsRec in swfrac.F and added some comments;
722      this does not change any of the results, because myIter=0 in swfrac always
723      lead to jwtype=2 (the default anyway), but the call makes little sense
724      as a default
725    o no SHORTWAVE HEATING lost at the bottom; affects lab_sea output; updated
726    o re-work pkg/thsice interface with ocean & bulk_force pkg to allow
727      atmospheric model (AIM) to use it ; add a "slab ocean" component.
728    o pkg/aim_v23 : add interface to call thermodynamic sea-ice (thsice)
729    o update global_ocean.cs32x15/output (.thsice) after changes in pkg/thsice
730    o extending useSingleCpuIO option to work with new exch2 I/O format
731      - old-style, missing-tile I/O is still accessible by defining CPP
732        option MISSING_TILE_IO in pkg/mdsio/MDSIO_OPTIONS.h
733    o monitor package can write to NetCDF files and/or STDOUT
734    o fix re-definition bug in MNC_GRID_INIT_ALL()
735    o doc/api_reference added
736      - a framework for building an API Reference Manual using all
737        the "protex" comments embedded in the code
738      - see pkg/generic_advdiff, pkg/mnc for examples
739    o MNC:
740      - make myThid the last argument for all subroutines
741      - new default for the grid files: NO halos
742      - add useMNC and other run-time flags
743      - separate per-file-group handling of the unlimited dimension
744      - early initialization of MNC w/ flags read at the eeboot stage
745        and lookup tables set in initialize_fixed
746      - write all MNC output to a freshly-created directory
747    o thermodynamics sea-ice (thsice) is now tested with testreport.
748    o test exp. advect_cs: use the standard cs32 grid ; update output.
749    o Added functionality to grdchk:
750      pick global i,j,k position (or nearest wet) where to perform check.
751    
752    checkpoint52l_post
753    o new land formulation:
754      a) use ground enthalpy as prognostic variable to ensure exact
755         energy conservation.
756      b) account for water temperature and for latent heat of freezing
757         in all processes (rain, run-off, ground storage)
758      c) compute surface and ground temperature implicitly.
759    o aim_v23 modification for new land model:
760      a) Treat separately land / ocean / sea-ice surface fluxes
761         to allow implicit computation of land & sea-ice surface temp.
762      b) add snow precipitation.
763    checkpoint52l_pre
764    
765    o fix problem (when 1 tile is empty) in min/max monitor.
766    o fix bug in timeAve (u,vZetatave in common block)
767    o no restoring terms under ice for pkg/seaice
768    o moved SEAICE_DO_DIAGS to S/R do_the_model_io
769    o bug fix for pkg/seaice pickups
770    o change MNC call locations and add coordinate attributes
771    o mask vorticity at the corner ; affects global_ocean.cs output
772    o fix ini_curvilinear_grid ; test CS experiments with mpi
773    o aim.5l_cs: modify sea-ice fraction input file ; update output
774    o exf: Adding simple range check routine for exf fields after read
775    
776    checkpoint52k_post
777    o removed top-level directory "diags"
778      - we migrated these functions to pkg/timeave a long time ago
779    o fixed bug introduced in pkg/monitor
780    o accuracy ctrlprec = 32 insuffient for gradient checks using
781      averaged fields (I/O via cost_averages)
782      -> use ctrl.h in active_file*.F to control I/O precision.
783    o paramter list of CALL ADTHE_MAIN_LOOP
784    o added initial do_the_model_io to ecco
785    o set all ...Freq to zero after cost_final
786      taveFreq, dumpFreq, pChkptFreq
787    o MAIN and ECCO differentiability restored
788    
789    checkpoint52j_post
790    o fix nchklev in tamc.h for global_ocean...
791    o Bringing flow and store directives up-to-date
792    o Really weird thing!
793      call do_the_model_io from the_main_loop with parameters
794      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
795      TAF places a faulty re-call of initialise_varia
796      after cost_final call which should not be there!
797    checkpoint52j_pre
798    
799    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
800      error messages
801    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
802    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
803      debug output
804    o modfied mdsio_writefield.F to handle non-global files under exch2
805    o update AIM Cubed-Sphere exp (aim.5l_cs):
806      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
807    o update AIM Equatorial Channel exp:
808      use standard aim_v23 pkg and change the SST fields to be more realistic.
809    o globalFile now works with exch2
810    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
811      mon_vort3.F to make exch2 friendly with >1 tile per cube face
812    o limit timeave output for hi-res integrations
813    
814    checkpoint52i_post
815    o removed CPP_EEOPTIONS.h from verification/*/code
816    o updated the tiling for global_ocean_pressure
817    checkpoint52i_pre
818    
819    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
820      the old pkg/aim).
821    
822    checkpoint52h_pre
823    o shortened offending lines in exch2_send_rx?.template
824    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
825    o genmake2: add build & execute test for NetCDF code
826    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
827      old grid files, moved CPP_EEMACROS.h to pkg/exch2
828    o added useSingleCPUIO flag to monitor.F and mon_out.F
829    o added temporary hack for sea-ice dynamics on the cube:
830      metric terms are ignored and it is assumed that
831      there is no sea-ice on cube faces 1, 2, 4, and 5.
832    
833    checkpoint52f_post
834    o added exch2 cube routines to pkg/exch2
835    o modified hs94.cs-32x32x5 to use it
836    o added new grid files to hs94.cs-32x32x5
837    checkpoint52f_pre
838    
839    checkpoint52e_post
840    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
841      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
842    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
843      to work with implicit vertical advection and AB ;
844    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
845    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
846     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
847    checkpoint52e_pre
848    
849    o fix bug in impldiff when Nr=1 or Nr=2.
850    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
851    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
852    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
853      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
854    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
855    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
856    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
857    
858    checkpoint52d_post
859    o re-tiled many expts to allow comparison in multi-processor mode
860      - updated output accordingly
861      - changed hs94.128x64x5 to use intial T from file rather than use the
862        random number generator
863    o add infrastructure in model routines for fizhi and gridalt packages
864    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
865    o changes to permit hi-res, cubed-sphere, configuration
866      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
867      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
868      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
869        of surface winds for the cube
870      (A verification experiment, based on global_ocean.cs32x15, but with
871       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
872       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
873       complete with example surface forcing files and matlab scripts to look
874       at the output and compare it with that of global_ocean.cs32x15.)
875    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
876       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
877       to conform to the common rule.
878    o check-in the first version of the coupler + interfaces for multi-components
879       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
880       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
881       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
882       - ocean and atmos. share the same horizontal grid (no interpolation).
883       - exchanges between component and coupler is done in forward_step
884    o new verification experiment, cpl_aim+ocn:
885       coupled ocean - AIM atmosphere on cs32 grid.
886    
887    checkpoint52d_pre
888    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
889    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
890    
891    checkpoint52c_post
892    o Fixing OPTIONS files for use of exf:
893      - ALLOW_ECCO not needed
894      - ECCO_CPPOPTIONS.h should not be included from
895        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
896        as has been the case in the past
897      - All cal/exf related options are currently set in
898        single header file. Should remain so until we
899        agree on a consistent new policy.
900    o Removed all CPP options for cal package.
901      cal has no more CPP options.
902    o modified STOREs in GAD_ADVECTION
903    o corrected key comp. for passkey
904    
905    checkpoint52b_post
906    o new version: "thsice" of thermodynamic sea-ice pkg:
907     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
908     - modify fluxes but do not change theta directly;
909     - light cleaning of bulk_force pkg (still needed with thsice).
910     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
911       + output_thsice.txt to test thsice & bulk_force pkgs.
912    o put back grid & coriolis monitor output.
913    checkpoint52b_pre
914    
915    o call "do_the_model_io" at the beginning (=> dump initial state)
916    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
917    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
918      (need info on NUMBER_OF_PTRACERS)
919    o missing PTRACERS headers in some routines
920    o default tamc.h in pkg/autodiff supposed to crash
921      to ensure proper customization
922    
923    checkpoint52a_post
924    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
925      - moved surfaceTendencyTice from pkg/seaice to main code
926      - subroutine FREEZE_SURFACE now limits only surface temperature
927        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
928        => new output.txt for global_ocean.cs32x15 & global_with_exf
929      - keep the old version of FREEZE for backward compatibility;
930        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
931      - corresponding modifs for TAF directives
932    o added surface flux output variables to TIMEAVE_STATVARS
933    o time-averaged output for pkg/ptracers
934    o fix problem with ECCO-related divided adjoint
935      snapshot file was missing some ad-variables,
936      but no warning issued by TAF
937    
938    checkpoint52a_pre
939    o some bug fixes for #undef REAL4_IS_SLOW
940    
941    checkpoint52 = ecco_c52_e35
942    o after testing adjoints of checkpoint51u_post
943    
944    checkpoint51u_post
945    o this is the post-merge tag of the ecco-branch
946      (needs another clean checkout and re-testing)
947    o various natl_box_adjoint configs and results
948      but no input fields
949    o obcs adjoint not yet merged!
950    o adding ECCO global 1x1 and 2x2 degree configs
951    o updated/extended some store directives for seaice
952    o pkg/ecco now containes ecco-specific part of cost function
953    o top level routines the_main_loop, forward_step
954      supersede those in model/src/
955      previous input data.cost now in data.ecco
956      (new namelist ecco_cost_nml)
957    o in ctrl/ cleaned some cross-dependencies and updated CPP options
958    
959    checkpoint51t_post
960    o this is the pre-merge tag of the ecco-branch
961    
962    checkpoint51s_post
963    o cleanup: removed various obsolete #define-s
964    o pkg/grdchk
965      - renamed 'ph-grd 3' to 'grad-res'
966      - merged from ecco-branch
967        (remaining bug fixes for obcs gradient checks)
968      - additional high-precision output for testreport
969        (grep for 'precision_grdchk_result')
970    
971    checkpoint51r_post
972    o cleaned up or removed CPP_OPTIONS.h files
973    o updated results for some of the tests to reflect the new
974      optfiles (-ieee: -O0 instead of -O3)
975    
976    checkpoint51q_post
977    o cd_code:
978      - moved cd_scheme.F -> cd_code_scheme.F
979      - separate read_checkpoint from cd_code_ini_vars.F
980      - separated cd_code part from write_checkpoint
981      - updated AD_SOURCE, generated .flow
982      - added CD_CODE_VARS.h to the_main_loop
983      - Moving cd_code specific store dir.s to pkg/cd_code
984    o ctrl package totally restructured
985      - pack/unpack now optional and decoupled from
986        xx_/adxx_ I/O
987      - ctrl_pack/unpack cleaned
988        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
989      - confined inclusion of AD_CONFIG.h to where necessary.
990    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
991    
992    checkpoint51p_post
993    o create initial cd_code package
994      - WARNING: the initialization of fields within packages
995        is broken because INI_FIELDS (where READ_CHECKPOINT is
996        called) is called *before* PACKAGES_INIT_VARIABLES.
997        This seems to be backwards since
998        1) its important to initially zero the entire field including
999           the "halo" region
1000        2) zeroing needs to be done *before* reading pickup info
1001           and the pickup call might or might not happen in any
1002           particular run
1003      - this needs an overhaul for R2
1004    o cleanup verification/*/code/GMREDI_OPTIONS.h
1005    o cleanup testreport
1006    
1007    checkpoint51o_post
1008    o bringing AD-related verif's up to date with genmake2
1009      - carbon/
1010      - global_ocean.90x40x15/
1011      - hs.94.1x64x5/
1012      - (front_relax/ )
1013    o (more) consistent directory structure for AD-related verif.'s
1014    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
1015    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
1016    o bug fix in find_alpha.F for MDJWF:
1017      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
1018        change rho -> rho-rhoConst
1019      - replace call find_rho to find_rhonum
1020    o initialisation of rFlx extended to full array (required by TAF)
1021      and shifted to thermodynamics
1022    o removed PTRACERS.h in ptracers routine
1023    o added surfacetendencyPtr to S/R parameter list pracers_forcing
1024    o Correcting initialisations for fVerU, fVerV.
1025    o helping TAF to recognize dependency on kUp for
1026      fVerU, fVerV
1027    o Replacing delZ by delR in pkg/ctrl/
1028    checkpoint51o_pre
1029    
1030    o undid all of cp51 pending some cleanups and discussion
1031    o added the [#include "AD_CONFIG.h"] statement to all files that need
1032       it for adjoint/tl #defines
1033     o re-worked the build logic in genmake2 to support AD_CONFIG.h
1034     o removed tools/genmake since it no longer works
1035    
1036    checkpoint51n_post
1037    o modifications to make FREEZE flux visible to pkg/kpp
1038      - moved surfaceTendencyTice from pkg/seaice to main code
1039      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
1040      - subroutine FREEZE now limits only surface temperature
1041        (this means new output.txt for global_ocean.90x40x15,
1042         global_ocean.cs32x15, and global_with_exf)
1043    o added surface flux output variables to TIMEAVE_STATVARS
1044    
1045    checkpoint51n_pre
1046    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
1047    o added [#include "AD_CONFIG.h"] to all files that use the following
1048      defines:
1049      - ALLOW_ADJOINT_RUN
1050      - ALLOW_TANGENTLINEAR_RUN
1051      - ALLOW_ECCO_OPTIMIZATION
1052    
1053    checkpoint51m_post
1054    o incorporating changes to get TAMC/TAF working in genmake2
1055      - added new TAMC/TAF targets to the Makefile
1056      - various cleanups related to package handling
1057      - these changes should have no impact on the forward model
1058    
1059    checkpoint51l_post
1060    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
1061     - faster algorithm for cal_addtime.F
1062     - higher precision arithmetic, where needed
1063     - pkg/exf *startdate variables changed from calendar date to
1064       model integration time
1065    
1066    checkpoint51l_pre
1067    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
1068    o enable to apply restoring on S & T only in a latitude band.
1069    o update output (external_forcing_surf modif. change truncation errors)
1070       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
1071    
1072    checkpoint51k_post
1073    o change default to: useNHMTerms=.FALSE.
1074     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
1075       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
1076     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
1077        exp1, ideal_2D_oce
1078     - change data file of oceanic exp (leave the results unchanged for now)
1079       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
1080    o set gravitySign automatically according to the vertical coordinate used
1081      (and change sign: back to "logical" value: +1 when R increases downward)
1082    o added an include barrier to the default CPP_OPTIONS.h and
1083      removed the #include "PACKAGES_CONFIG.h" from it
1084    o fix a bug in mom_fluxform (from chk51j_post)
1085    
1086    checkpoint51j_post
1087    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
1088    o adjusted some flow directives (dynamics, thermodynamics)
1089    o added cubed-sphere case to test cost function
1090    o heckpoint_lev?_directives.h now include
1091      pkg-specific directives, whenever those are enabled.
1092    o Moving pkg-specific flow directives to corresponding pkg
1093      Moving pkg-specific differentiation list to corresponding pkg
1094      Moving pkg-specific checkpoint-lev storing to corresponding pkg
1095      ---> conventions are
1096           - pkg_ad.flow
1097           - pkg_ad_diff.list
1098           - pkg_ad_check_lev?_dir.h
1099    
1100    checkpoint51i_post
1101    o merge of the branch-genmake2
1102      - knowingly breaks the older genmake
1103      - automatic generation of all ALLOW_${PKG_NAME} defines
1104      - new testreport supersedes older testscript
1105    o large number of package inclusion and header cleanups
1106    checkpoint51i_pre
1107    
1108    o new output for adjoin of global ocean vector invariant
1109    o fix for checkpoint of thermodynamic seaice and bulk_force
1110    o Steph gchem various cleanups
1111    
1112    checkpoint 51h_pre
1113    o fixed some single quotes
1114    o modify gchem pkg to be more versatile
1115    o modifications to clean up dic pkg
1116    o add pkg/cfc
1117    
1118    checkpoint51g_post
1119    o provide links for ARPACK and ADM*TLM
1120    o start removing verification/vero/
1121    o update AD-related stuff
1122      (in particular some IF-statements in model/src/ routines)
1123    o adding to verification/global_ocean.90x40x15/ adjoint of
1124      vector invariant setup
1125    
1126    checkpoint51f_post
1127    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
1128    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
1129      of tracer Green's fucntions for ocean inversion project.
1130    
1131    checkpoint51f_pre
1132    o Added on-the-fly spatial interpolation capability
1133        "USE_EXF_INTERPOLATION" to pkg/exf.
1134      - This is a temporary Cartesian-grid hack until
1135        the super-duper ESMF coupler becomes available.
1136      - See verification/global_with_exf/README for usage example.
1137      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
1138        flags and modified pkg/seaice accordingly.
1139    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
1140        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
1141        non-local transport term.
1142    
1143    checkpoint51e_post
1144    o pkg/mom_vecinv:
1145      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
1146      - add time-ave diagnostic of vorticity advection.
1147    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
1148    o atmospheric geopotential: - include water vapor effect;
1149                                - use p^kappa in p* scaling.
1150    o land pkg: read initial state from files.
1151    o AIM : add stratospheric drag in the upper level
1152    
1153    checkpoint51d_post
1154    o change function ILNBLNK (=> last non-blank char.) to return zero
1155      (instead of the string length) when the string. char is empty
1156    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
1157    o modif's to restore TAMC compatibility
1158      - avoid "_d" constructs in PARAMETER declarations
1159      - avoid interrupting lines by comment lines
1160    o Use cluster local disks for purely local I/O
1161      vs. globally visible disks needed for ctrl stuff
1162      (merged from ecco-branch)
1163      - new active_file_loc... and mdsio_..._loc routines
1164      - affected packages: autodiff, ctrl, grdchk, mdsio
1165    
1166    checkpoint51c_post
1167    o introducing integer flag debugLevel
1168      - debLevZero: suppress all output
1169      - debLevA: standard
1170      - debLevB: equivalent to current debugMode=.TRUE.
1171    o introducing pathname variable mdsioLocalDir for mdsio
1172      that can be specified at runtime
1173      (relevant for cluster I/O to local disk)
1174    `
1175    >>>checkpoint51b_post
1176    adjoint of ptracers
1177    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
1178    o extended state in checkpoint_lev?, etc.
1179    o alternative ctrl/cost with tr1 or ptracer
1180    o new comlev1_bibj_ptracers
1181    o new ptracers.flow
1182    o made ptracers_forcing same as external_forcing_s
1183    o added verification for adjoint with ptracers
1184      - adm. grdchk fail so far
1185      - tlm. grdchk OK
1186      - checked tapelev/comlev recomputations: OK
1187    <<<checkpoint51b_pre
1188    
1189    checkpoint51a_post
1190    o added code for biogeochemistry package
1191      - new pkgs: dic, gchem
1192      - new subroutine in ptracers
1193    o modify code for biogeo packages
1194      - in model/src and pkg/ptracers
1195    
1196    checkpoint51
1197    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
1198      - autodiff, ctrl, exf, grdchk, seaice
1199      kept separate packages
1200      - cost, ecco, obcs
1201    o updating verification/internal_wave, verification/lab_sea
1202      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
1203    
1204    checkpoint50i_post
1205    o Preparing next differentiable checkpoint and sync
1206      of MAIN vs. ecco-branch
1207      - 1st step: this one is differentiable
1208      - 2nd step: next(! not this) checkpoint will have updated packages
1209                  from ecco-branch)
1210    
1211    checkpoint50h_post
1212    o new package "land": provide surface BC for AIM.
1213    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
1214    o AIM: use true log-P extrapolation for near surface temp (= as in
1215        F.Molteni paper) ; update aim.5l_cs output.
1216    o New variable in PARM03 for more flexible pickups
1217    o somewhat cleaned package initialisation sequence for
1218      ctrl/ cost/ ecco/ in packages_... routines
1219    
1220    checkpoint50g_post
1221    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
1222      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
1223      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
1224        made the default because of faster convergence than ADI
1225    
1226    checkpoint50f_post
1227    o exf totally restructured
1228      - replaced all exf_set_ routines by one generic exf_set_gen.F
1229        and made sure it's still differentiable
1230      - split exf_getffields.F into new exf_bulkformulae.F
1231      - exf_inscal_/exf_outscal_ suffixes consistent with field names
1232      - updated adjoint/makefile and relevant verif. accordingly
1233    
1234    checkpoint50f_pre
1235     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
1236          + change Evap over land. (update aim.5l_cs output)
1237     o added missing .cvsignores and made uniform across expts
1238     o changed configuration of tidal_basin_2d expt
1239     o added pkg/debug functions for tracing code in fatal crashes
1240     o tidied pkg/monitor to use MONITOR_OPTIONS.h
1241     o new fn in pkg/monitor to stop model if solution grows too big
1242     o removed lots of single quotes from comments
1243    
1244    checkpoint50e_post
1245    o make KPP work with PTRACERS
1246     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
1247       nearly a copy of kpp_transport_s
1248     - there is no analogue to SurfaceTendencyS, so I have to use
1249       gPtr(of the surface layer) instead
1250    o add a new platform SunFire+mpi (SunFire 15000) to genmake
1251    checkpoint50e_pre
1252    
1253    checkpoint50d_post
1254    o change kpp output from multiple-record state files to single-record state
1255      files analogous to write_state.F
1256    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
1257      analogous to the cg2d-related output.
1258    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
1259      so that writing to internal file fn (with length 512) fails.
1260    checkpoint50d_pre
1261    
1262    checkpoint50c_post
1263    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
1264    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
1265    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
1266    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
1267    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
1268    
1269    checkpoint50c_pre
1270    Merging from release1_p13:
1271    o bug fix for pkg/seaice dynamic solver
1272    o Added SEAICE_initialHEFF to pkg/seaice
1273    
1274    checkpoint50b_post
1275    o store u*,v* in gU,V instead of in guNm1,gvNm1
1276    o in order to put the momForcing out of the Adams-Bashforth:
1277      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
1278      to timestep.F
1279    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
1280    o re-generate output for highly sensitive test-exp:
1281       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
1282    
1283    checkpoint50b_pre
1284    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
1285    o corrected CPP option mismatch in exf_Bulk... functions for case
1286      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
1287    
1288    checkpoint50a_post
1289    o Bug fix for merging between c50 and KPP.
1290      ikey was passed from thermodynamics to kpp_calc via
1291      common block rather than being recomputed in kpp_calc,
1292      in contradiction with new key itdkey.
1293      New key ikppkey created, and tamc.h headers updated.
1294    
1295    checkpoint50
1296    - 2nd step of merge with ecco-branch:
1297      merge changes in ecco-branch back into main trunk
1298    - bug fix in find_alpha
1299    - more storing in gmredi_calc_tensor.F, kpp_routines.F
1300    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
1301    - merged some sliced AD support routines
1302    
1303    checkpoint49
1304    merged from ecco-branch:
1305    o exf:
1306      - Enable initialisation of forcing fields to constant
1307        (runtime) values.
1308      - in exf_getffields.F
1309        Reduce i-/j-loop to interior domain, discarding overlaps.
1310        That also fixes wrong TAF-key computations for key_1, key_2
1311        with bulf formulae.
1312      - exf_init.F modify #ifdef for exf_init_evap
1313      - exf_getffieldrec.F, ctrl_getrec.F
1314        The following INT-usages are not safe:
1315          fldsecs  = int(fldsecs/fldperiod)*fldperiod
1316          fldcount = int(fldsecs/fldperiod) + 1
1317        and were modified.
1318    o autodiff: checkpoint_lev...
1319      - updated storing for bulk formulae (some arrays were missing)
1320      - added state for seaice package
1321      - synchronized with main branch
1322    o DIVA:
1323      Modif.s in
1324      - the_main_loop.F
1325      - the_model_main.F
1326      and added cost_final_restore.F cost_final_store.F
1327      o With these changes, it is possible to fully separate
1328        the first forward run to compute the cost function (mdthe_main_loop)
1329        and adjoint runs over individual DIVA intervals (adthe_main_loop)
1330        into separate model executions.
1331        This enables better tuning of DIVA to given queue sizes.
1332      o Loss of cost function value in consecutive DIVA runs is
1333        fixed by storing to 'costfinal' file.
1334      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
1335        beginning/end of adjoint integration is accounted for.
1336      The current changes apply to TAF-1.4.26.
1337      TAF has one remaining bug, requiring one manual change
1338      (see MITgcm manual).
1339    o cal: synchronized between MAIN and ecco-branch
1340    
1341    checkpoint48i_post
1342    o Changes to restore differentiability of code w.r.t. previous tag
1343      (mostly adding new routines to make list and replacing
1344      pressure by totPhiHyd).
1345    o Updated and merged grdchk package
1346      - has both ADM and TLM checks
1347      - works for single- and multi-proc.
1348      - output cleaned
1349      - worked successfully for parallel DIVA
1350    o genmake:
1351      - Adding -platform=SP4
1352      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
1353    o Modif. for DIVA:
1354      ctrl_unpack should not be called in intermediate DIVA interval.
1355      (similar thing would apply for active files such as
1356      tbar, sbar, psbar, which should not be reinitialised;
1357      only relevant for ecco-branch)
1358    
1359    checkpoint48h_post
1360    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
1361    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
1362    o Added SEAICE_initialHEFF to pkg/seaice
1363    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
1364    
1365    checkpoint48g_post
1366    --- EOS:
1367    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
1368      store total Potential in totPhyHyd for diagnostics & EOS.
1369    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
1370    --- Pressure/geopotential gradient:
1371    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
1372    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
1373      ( changes results of global_ocean_pressure )
1374    o NLFS + z-coord.: add eta*Rho' contribution.
1375    o accurate phiHyd when using interface-W at the middle between 2 centers
1376     ( changes results of ideal_2D_oce )
1377    o includes r* 2nd term in potential gradient.
1378    
1379    checkpoint48f_post
1380    Merging from release1_p12:
1381    o Modifications for using pkg/exf with pkg/seaice
1382      - improved description of the various forcing configurations
1383      - added basic radiation bulk formulae to pkg/exf
1384      - units/sign fix for evap computation in exf_getffields.F
1385      - updated verification/global_with_exf/results/output.txt
1386    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
1387      (SBO) core products, including oceanic mass, center-of-mass,
1388      angular, and bottom pressure (see pkg/sbo/README.sbo).
1389    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
1390      to avoid negative values in shallow regions.
1391      - updated verification/natl_box/results/output.txt
1392      - updated verification/lab_sea/results/output.txt
1393    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
1394    o Added useSingleCpuIO option (see PARAMS.h).
1395    o Updated useSingleCpuIO option in mdsio_writefield.F to
1396      work with multi-field files, e.g., for single-file pickup.
1397    o pkg/seaice:
1398      - bug fix in growth.F: QNET for no shortwave case
1399      - added HeffFile for specifying initial sea-ice thickness
1400      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
1401    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
1402      kpp_transport_t.F, forward_step.F, and the_main_loop.F
1403    o pkg/seaice:
1404      - adjoint-friendly modifications
1405      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
1406    
1407    checkpoint48e_post
1408    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
1409    o dynamics: change definition of computational domain & adapt mom_fluxform
1410      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
1411    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
1412        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
1413        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
1414        global_ocean.90x40x15 global_with_exf global_ocean_pressure
1415        inverted_barometer solid-body.cs-32x32x1
1416      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
1417    
1418    checkpoint48d_post
1419    o in preparation for r*:
1420     a) use pre-computed gradient of hydrostatic potential:
1421        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
1422     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
1423        => affects results of glob_oce_pressure (different truncation error)  
1424      update output.txt of ideal_2D_oce & global_ocean_pressure
1425    
1426    checkpoint48d_pre
1427    o in preparation for r*:
1428      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
1429      pass the 2 comp. of the grad. as arguments to momentum S/R.
1430      but for the moment, only used if it does not change the results.
1431    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
1432    
1433    checkpoint48c_post
1434    Modifications in treatment of initial flux forcing controls
1435    to avoid extra storing of flux fields.
1436    
1437    checkpoint48c_pre
1438    o Added tidal_basin_2d experiment (currently 1D!)
1439    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
1440    
1441    checkpoint48b_post
1442    o r* coordinate added in #ifdef NONLIN_FRSURF block.
1443     (modification to pressure gradient not yet implemented)
1444    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
1445      (for U & V) that are used for vertical advection of momentum.
1446    
1447    checkpoint48a_post
1448    o In preparation for r*, use temp. array to compute vertical transport
1449       in flux-form momentum pkg. => change results of few test-exp.
1450      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
1451                        lab_sea, natl_box & plume_on_slope
1452    
1453    checkpoint48
1454    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
1455    
1456    checkpoint47j_post
1457    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
1458    o moved adexch from forward_step to addummy_in_stepping
1459    o added exch in ctrl_map_...
1460    o aveFreq.=0. at end of cost_final to avoid overwrite in
1461      reverse checkpointing loop
1462    o Yet more changes in gmredi:
1463      * adgmredi_calc_tensor
1464        avoiding all recomputation of gmredi_slope_limit
1465      * adgmredi_x/y/rtransport
1466        added flag for excessive storing to avoid recomp. of
1467        u/v/rtans, dTdx/y/z
1468        -> this is not really necessary and very memory-consuming
1469      * adgmredi_slope_psi:
1470        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
1471      * gmredi_slope_limit
1472        re-activated full calculation of taperfct for case 'ac02'
1473    o updating verification/ adjoints of carbon, global_ocean.90x40x15
1474    
1475    checkpoint47i_post
1476    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
1477    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
1478      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
1479    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
1480    o gmredi: fix few bugs.
1481    
1482    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
1483    This will be a good checkpoint to plug into the ecco-branch.
1484    o few modif.'s to get latest version adjointed
1485      (mainly kick out code in ini_linear_phisurf)
1486    o modif's to run adjoint with exactConserv
1487    o case GM_BOLUS_ADVEC should be cleaned
1488      S/R gmredi_slope_psi should be cleaned
1489    o verification/carbon now has exactConserv=.TRUE.
1490    
1491    checkpoint47g_post
1492    o time-average AIM output: becomes independent from statvars time-average
1493      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
1494    o After TAF bug fix:
1495      Tested adjoint of gmredi package.
1496      Tests were done with checkpoint47 rather than with latest
1497      checkpoint47f_post since the latter is broken for the adjoint
1498      verification/carbon/ contains both ADM and TLM gradient checks.
1499    Here they are, before they get changed/lost/stolen.
1500    Mostly modif.'s to fix numerical sensitivities.
1501    Gradient checks OK for
1502    - GM_taper_scheme:
1503      * clipping
1504      * ac02
1505      * linear
1506      * glw91
1507      * dm95
1508      * ldd97
1509    - GMREDI_OPTIONS:
1510      * GM_VISBECK_VARIABLE_K
1511      * GM_NON_UNITY_DIAGONAL
1512      * GM_EXTRA_DIAGONAL
1513      * GM_BOLUS_ADVEC
1514    in conjunction with data.gmredi parameters to be checked in
1515    in a few minutes under verification/carbon/code/
1516    
1517    checkpoint47f_post
1518    Merging from release1_p10:
1519    o modifications for using pkg/exf with pkg/seaice
1520      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
1521        and SEAICE_EXTERNAL_FLUXES
1522      - pkg/exf CPP options EXF_READ_EVAP and
1523        EXF_NO_BULK_COMPUTATIONS
1524      - usage examples are Experiments 8 and 9 in
1525        verification/lab_sea/README
1526      - verification/lab_sea default experiment now uses
1527        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
1528    
1529    checkpoint47e_post
1530    o created a tag prior to creating a branch
1531    
1532    checkpoint47d_post
1533    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
1534      at the bottom boundary had an erroneous half slip boundary condition
1535    o added bottom drag and no slip boundary condition capabilities to
1536      oceanic pressure coordinates code
1537    o added new verification experiment global_ocean_pressure, this experiment is
1538      also described in the tutorial section of the manual
1539    checkpoint47d_pre
1540    
1541    checkpoint47c_post
1542    o Added a verification experiment for a global cubed-sphere ocean run
1543      -  verification/global_ocean.cubed32x32x30
1544      -  uses pkg/therm_seaice and pkg/bulk_forcing
1545    
1546    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
1547    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
1548      when using P-coordinate; only implemented for atmospheric config.
1549    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
1550      NOTES: requires option NONLIN_FRSURF to be "#define".
1551    o update advect_xz/results/output.txt (left from checkpoint44g_post)
1552    
1553    checkpoint47b_post
1554    Merging from release1_p9:
1555    o pkg/seaice
1556      - removed GOTO's and added taf directives
1557      - double precision constants to reduce the g77 (Linux)
1558        to F77 (SGI) differences reported in release1_p8
1559    o tools/genmake
1560      - added SGI options
1561    o verification/testscript
1562      - updated to that of checkpoint47a_post
1563    o verification/global_ocean.90x40x15/input/eedata
1564      - modified for SGI f77 compatibility
1565    o verification/lab_sea
1566      - added description of sea-ice model
1567      - added missing matlab routines
1568      - added test of thermodynamics parallelization
1569    
1570    checkpoint47a_post
1571    o new pkg: aim_v23
1572     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
1573       for now, keep the same surface forcing as before.
1574     - Part-Cell implemented into AIM; check that Heat & Water are conserved
1575     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
1576     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
1577    o add diagnostic of surface correction term in monitor output
1578    
1579    o bulk_force and therm_seaice
1580    - Two packages:  bulk_force (Bulk forcing)
1581      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
1582    - Earlier integration from Stephaine Dutkiewicz
1583      and Patrick Heimbach.
1584    - Two ifdef statements for compile time,
1585       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
1586    
1587    checkpoint47
1588    differentiable version of checkpoint46n_post
1589    o bug fix in quasihydrostaticterms
1590    o * "clean" adjoint code (in terms of extensive recomputations)
1591        can now be obtained for all GMREDI options (i.e. for
1592        - GM_VISBECK_VARIABLE_K
1593        - GM_NON_UNITY_DIAGONAL
1594        - GM_EXTRA_DIAGONAL
1595        - GM_BOLUS_ADVEC )
1596      * However, wrong gradient check problem remains unsolved.
1597      * New CPP options have been introduced for different
1598        tapering schemes
1599    o external_fields_load now part of differentiation list
1600    o pressure needs multiple storing;
1601      would be nice to have store_pressure at beginning or
1602      end of forward_step, e.g. by having phiHyd global (5-dim.)
1603      (NB: pressure is needed for certain cases in find_rho,
1604      which is also invoked through convective_adjustment).
1605    o recomputations in find_rho for cases
1606     'JMD95'/'UNESCO' or 'MDJWF' are OK.
1607    o #define ATMOSPHERIC_LOADING should be differentiable
1608    o ini_forcing shifted to begining of initialise_varia
1609    o Incorporating QNVS line search routines into MITgcm
1610      (this is separate code, and therefore not under pkg)
1611      lsopt/, optim/
1612    o Updated verification/carbon/
1613      - #define GM_VISBECK_VARIABLE_K
1614      - GM_taper_scheme    = 'ldd97'    
1615    
1616    checkpoint46n_post
1617    Merging from release1_p8:
1618    o verification/natl_box:
1619      updating new external_fields_load routine
1620    o New package: pkg/seaice
1621      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
1622      The sea-ice code is based on Hibler (1979-1980).
1623      Two sea-ice dynamic solvers, ADI and LSR, are included.
1624      In addition to computing prognostic sea-ice variables and diagnosing
1625      the forcing/external data fields that drive the ocean model,
1626      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
1627      The implied surface heat flux is then stored in variable
1628      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
1629      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
1630      non-local transport term.  Because this call precedes model
1631      thermodynamics, temperature under sea-ice may not be "exactly" at
1632      the freezing point by the time theta is dumped or time-averaged.
1633      N.B.: fairly large differences in accuracy occur across
1634            different platforms/compilers; comparison between
1635            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
1636            generated output gives:
1637       T           S           U           V
1638      C D M    c        m  s        m  s        m  s        m  s
1639      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
1640      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
1641      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
1642    
1643      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
1644    o GAD:
1645      - generated new common blocks to account for call of
1646        same gad routines with differing traceridentities
1647        (needed to modify tracerIdentity indices in GAD.h)
1648      - generated separate common blocks for case useCubedSphereExchange
1649        (Department of Futurology)
1650      - parameter lists to gmredi_?transport: added tracerIdentity
1651      - added new key indices to tamc.h
1652    o external_fields_load:
1653      - added this routine to TAF list
1654      - needed to make some common blocks global and additional storing
1655        along the same lines as exf package (checkpoint_lev?_directives.h)
1656    o exf:
1657      updated external forcing package
1658      - bug fixes carried over from ecco-branch
1659        (missing OBCS_OPTIONS.h in two routines)
1660      - enable easy to use "no forcing".
1661      - added exf I/O for atmospheric loading
1662      - added exf I/O for runoff data
1663      - transfered scaling between exf <-> MITgcm to exf namelist
1664    o Adding new verification experiment global_with_exf.
1665      This verification experiment is almost identical to the
1666      global_ocean.90x40x15 experiment, except that it uses
1667      the exf (and cal) package instead of the
1668      external_fields_load routine (cf README file).
1669    
1670    checkpoint46m_post
1671    o modified testscript to return -- when there are no lines of "%MON" output
1672    o added new flag "quasiHydrostatic" for QH mode
1673      and new routine quasihydrostaticterms()
1674    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
1675      New routine: mom_u_coriolis_nh()
1676    o fixed sign of non-hydrostatic metric terms in u and v equations.
1677      Depend on correct sign of gravitySign.
1678    o added work.pc* to .cvsignore in aim directories using ifc
1679    o introduced flag for controllin non-hydrostatic metric terms
1680    o removed gravitySign from PARM04
1681    o switched to g77/ifc from pgf77 in aim experiments
1682    
1683    checkpoint46l_post
1684    o made convective adjustment work with pressure coordinates:
1685     - changed the direction of k-loop in convective_adjustment.F for the
1686       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
1687     - adjusted the reference pressure k-index in convective_adjustment.F
1688     - adjusted the convection condition in convect.F (in analogy to
1689       calc_ivdc.F)
1690     - convective_adjustment no longer computes anything on the halos
1691     - removed the warnings about negative salinity from find_rho.F and
1692       find_alpha.F; instead the new routine look_for_neg_salinity, called
1693       at the beginning of find_rho, find_alpha, and find_beta, does a
1694       check of the entire slice, if CPP-option
1695       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
1696    checkpoint46l_pre
1697    
1698    checkpoint46k_post
1699    o fixed the verification/global_ocean.90x40x15 experiment:
1700     - new bathymetry (the world according to A., JMC, and M.)
1701     - new initial fields and forcing fields (*.bin files)
1702     - new POLY3.COEFFS (for the next release one should switch to a full
1703       equation of state: JMD95P or MDJWF)
1704     - fixed several errors and redundancies in the data file
1705     - experiment uses looped cells
1706     - added matlab directory with diagnostic scripts for plotting of output
1707    
1708    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
1709     - read AIM physics parameters from a file (data.aimphys)
1710     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
1711    
1712    checkpoint46j_post
1713    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
1714    o move wVel computation at the end of the time step, in S/R integr_continuity
1715    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
1716    o update timeave pkg for wVel diagnostic.
1717    checkpoint46j_pre
1718    
1719    checkpoint46i_post
1720    o Clean up AIM package (and keep the results unchanged):
1721      include CPP_OPTION and use IMPLICT NONE in all routines ;
1722      declare all the variables _RL ; use _d 0 for all numerical constants.
1723      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
1724    
1725    checkpoint46h_post
1726    o cleaned up the use of rhoNil and rhoConst.
1727      - rhoNil should only appear in the LINEAR equation of state, everywhere
1728        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
1729        and the dynamical equations are all divided by rhoConst
1730    o introduced new parameter rhoConstFresh, a reference density of fresh
1731      water, to remove the fresh water flux's dependence on rhoNil. The default
1732      value is 999.8 kg/m^3
1733    o cleanup up external_forcing.F and external_forcing_surf.F
1734      - can now be used by both OCEANIC and OCEANICP
1735    checkpoint46h_pre
1736    
1737     Added code to convert surface volume flux (fresh water) into
1738     a mass flux when using P coordinates in the ocean (OCEANICP).
1739     Note: It assumes you have set rho0=rhoConst=density of fresh water.
1740    
1741    checkpoint46g_post
1742    o Include a new diagnostic variable phiHydLow for the ocean model
1743      - in z-coordinates, it is the bottom pressure anomaly
1744      - in p-coordinates, it is the sea surface elevation
1745      - in both cases, these variable have global drift, reflecting the mass
1746        drift in z-coordinates and the volume drift in p-coordinates
1747      - included time averaging for phiHydLow, be aware of the drift!
1748    o depth-dependent computation of Bo_surf for pressure coordinates
1749      in the ocean (buoyancyRelation='OCEANICP')
1750      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
1751        Theta, Salinity, and Pressure in the parameter list. This routine is
1752        presently contained in find_rho.F. This routine does not give the
1753        correct density for 'POLY3', which would be a z-dependent reference
1754        density.
1755    o cleaned up find_rho
1756      - removed obsolete 'eqn' from the parameter list.
1757    o added two new verification experiments: gop and goz
1758      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
1759    checkpoint46g_pre
1760    
1761    checkpoint46f_post
1762    o Enable tangent linear (forward mode) gradient checks:
1763      - extended active file handling to g_... files
1764      - added TANGENT_SIMULATION to theSimulationMode
1765      - extended grdchk package accordingly
1766    o added tangent linear setup in verification/carbon/code_ftl
1767    o added adjoint setup in verification/front_relax/code_ad
1768    
1769    checkpoint46e_post
1770    o Added new equation of state -> MDJWF
1771      - EOS of McDougall et al., 2002, JAOT, submitted
1772      - caveat: the equation of state is only valid for a smaller (more
1773        realistic?) range of values than JMD95P/Z and UNESCO
1774      - added masks to the calculation of pressure in store_pressure
1775      - added more check values for density in check_eos (ini_eos.F), some of
1776        the old check values are out of the range of the MDJWF-eos, so don't
1777        expect perfect matches for those
1778    checkpoint46e_pre
1779    
1780    checkpoint46d_post
1781    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
1782      'OCEANICP', also initialised field pressure correctly in ini_eos in the
1783      case of pressure coordinates. eosType='JMD95Z' in
1784      combination with buoyancyRelation='OCEANICP' now causes an error.
1785    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1786      in find_alpha/beta.
1787    checkpoint46d_pre
1788    
1789    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1790      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
1791    
1792    checkpoint46c_post
1793    o Changes necessary for ocean in p-coordinates
1794     -  Added new buoyancy relation = 'OCEANICP'
1795     -  Added new parameters = gravitySign (this used to be contained inside
1796        the factor dRdZ which I added when we first switched to R coordinates).
1797     X GM/Redi is not compatible (yet)
1798     X bottom drag and no-slip need to be debugged.
1799    checkpoint46c_pre
1800    
1801    checkpoint46b_post
1802    o Added new equation of state -> JMD95Z and JMD95P
1803      - EOS of Jackett and McDougall, 1995, JAOT
1804      - moved all EOS parameters into EOS.h
1805      - new routines ini_eos.F, store_pressure.F
1806    o Added UNESCO EOS, but not recommended because it requires
1807      in-situ temperature (see JMD95)
1808    o Modified formatting for knudsen2.f in utils/knudsen2 and added
1809      unesco.f to be used with POLY3
1810    checkpoint46b_pre
1811    
1812    checkpoint46a_post
1813    o Added (atmospheric) pressure loading
1814      - new field in FFIELDS.h, etc...
1815      - new cpp flag ATMOSPHERIC_LOADING
1816    o Changed hFacC to _hFacC in calc_phi_hyd.F
1817    o Added SHORTWAVE_HEATING to some files for consistency
1818    checkpoint46a_pre
1819    
1820    checkpoint46
1821    further merges from release1_p5
1822    o new ctrl package
1823      - adopted from ECCO environment to enable optimization
1824      - added Eliassen Palm fluxes to controls
1825    o added Eliassen Palm flux controls to gradient check package
1826    o cost package
1827      - Compatible with new ctrl package
1828      - added Eliassen Palm cost hooks
1829      - modif's of existing cost functions
1830    o Adjoint-related bug fixes in kpp:
1831      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
1832      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
1833    o autodiff package
1834      - flow directives:
1835        + new for S/R do_the_model_io
1836        + enhanced for S/R checkpoint
1837        + new gmredi.flow
1838      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
1839        disable adcommon.h/g_common.h by default.
1840      - fixed problem for adjoint of global_max
1841    o modified verification/carbon/
1842    o New setup for adjoint of global_ocean
1843    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
1844    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
1845    o incorporated hooks for sponge layer code (external_forcing.F)
1846    
1847    checkpoint45d_post
1848    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
1849    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
1850      (affects plume_on_slope "cg2d" output)
1851    o add new parameter deltaTfreesurf for free-surface time stepping
1852    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
1853    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
1854    o change phiMin in exp1 (to agree with documentation)
1855    o add new flags:
1856     - T,S forcing inside/outside Adams-Bashforth
1857     - turn off temp,salt advection and/or forcing
1858     - for each tracer, define internal flag for multiDimAdvection & A-B
1859    o monitor: change definition of KE to check conservation of Energy
1860    
1861    checkpoint45c_post
1862    o Removed f90 comments ("!")
1863    o Modified initialisations to enable exf package for MITgcm
1864      (without invoking ECCO_PACKAGE).
1865    o modifications to gradient check package (Martin Losch)
1866      - enable centered differences
1867      - modified format of standard output
1868    
1869    checkpoint45b_post
1870    o cleaned exchange calls in cg2d
1871    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
1872    o included CPP option SINGLE_LAYER_MODE in thermodynamics
1873      to configure barotropic setup (Martin Losch)
1874    o moved some initialisations within bi,bj loop in dynamics
1875      (TAF flow dependency)
1876    o in initialise_varia, moved call packages_init_variables
1877      before convective_adjustment_init
1878      (corresponding adjustment of TAF tape initialisation).
1879    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
1880    
1881    checkpoint45a_post
1882    o compute Rho over the whole domain (extend iMin,jMin indices)
1883    o specific exchange for X-slice domain (case Ny=1)
1884    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
1885    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
1886    
1887    checkpoint44h_post = checkpoint45
1888    o Fix to restore differentiability:
1889      place at which packages_init_variables is called in
1890      initialise_varia is crucial for reverse control flow.
1891    o modifications in GMRedi to enable stable adjoint
1892      (corresponding modif's in thermodynamics, dynamics)
1893    o added missing hook for sponge layer code in external_forcing
1894    o modified test cost functions
1895    o storing in gad_advection (plus removal of write(0,*)!
1896    o missing headers TR1.h added in convective_adjustment routines
1897    o errorMessageUnit set non-equal zero in eeboot
1898      (conflict on some platforms, e.g. IBM SP3)
1899    o modified carbon verif.
1900    
1901    checkpoint44h_pre
1902    o vertical grid option: allow to put the Interface at the middle between
1903      2 cell-centers ; replace delZ in pkg/kpp by drF.
1904    o GM Advective form: Tracers are advected using the residual transport (=
1905      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
1906    
1907    checkpoint44g_post
1908    o fix surface correction term in multiDimAdvection (affects plume_on_slope
1909      results) ; ifdef missing in thermodynamics.F
1910    
1911    checkpoint44f_pre,checkpoint44f_post
1912    o added PTRACERS package
1913      This allows an arbitrary number of passive tracers to be integrated
1914      forward simultaneously with the dynamicaly model.
1915      + Implemented so far:
1916        - basic forward algorithm (time-stepping, advection, diffusion, convection)
1917        - I/O and checkpointing
1918        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
1919      + Not implemented so far:
1920        - KPP
1921        - OBCS
1922      + No specific example supplied (yet) but global_ocean.90x40x15 has the
1923        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
1924        line in data.pkg.
1925      + This package is disabled by default since it increases storage.
1926    
1927    
1928    o testscript: added -cleanup option
1929    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
1930                 b) enable to filter 2D fields.
1931    
1932    checkpoint44e_pre,post
1933    o re-wrote convective adjustment to use pre-calculated weights
1934      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
1935      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
1936      Original calls to convect() still in place.
1937    
1938    chkpt44d_pre,post
1939    o added missing EXCLUDE_MONITOR flags
1940    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
1941      (incompatible typ in MIN/MAX expressions caused problems
1942      on IBM SP3)
1943    o in genmake added variable MAKEDEPEND
1944      plus resetting for case SunOS
1945    o added timer_stats.c routine for IBM SP3
1946    o removed variables in dynamics
1947    !!! I forgot to create tag chkpt44d_pre !!!
1948    !!! But chkpt44d_pre = chkpt44c_post    !!!
1949    
1950    o real fresh water flux implemented with non-linear free-surface.
1951    
1952    chkpt44c_pre,post
1953    o few fix (mask in shap_s2, EmPmR in external_field_load,
1954      USE_NATURAL_BCS in solve_for_P);
1955    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
1956    
1957    checkpoint44b_pre/_post
1958    o merge of relevant stuff from the ecco-branch:
1959      - genmake: removed $S64 overwrite for case SunOS
1960      - pkg/exf: update and corrections for field swapping and obcs
1961      - pkg/ecco: parameter lists for the_model_main, the_main_loop
1962                  harmonized between ECCO and MITgcm
1963      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
1964                      updated checkpointing_lev... lists for obcs
1965      - model/src: minor changes in forward_step, plot_field
1966                   added directive for divided adjoint in the_main_loop
1967      - pkg/mdsio: added mdsio_gl_slice
1968    
1969    o check parameters & config (chkpt44a_pre,post)
1970    o OBC and NonLin_FrSurf.
1971    
1972    checkpoint44
1973    o fix bug in mom_vi_del2uv
1974    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
1975    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
1976    o update AIM experiments (NCEP input files)
1977    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
1978    o added some stuff for AD
1979    
1980    checkpoint43
1981    o added two new advection tests
1982    o added global 4x4 degree ocean test
1983    o added test of H&S94 with free surface on cube
1984    o some final mods for gradient check, adjoint,...
1985    
1986    checkpoint42
1987      Fixed AD-related problems:
1988    o Store directives up-to-date with re-arranged Adams-Bashforth
1989      (mainly thermodynamics.F)
1990    o New store directives for multi-dim. advection schemes
1991      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
1992      * new common block and key passkey
1993      (mainly gad_advection.F)
1994    o Modified store directives for split of dynamics/thermodynamics
1995      for the case ALLOW_KPP
1996    o Cleaned argument list for timestep_tracer.F
1997    
1998    checkpoint41
1999    o re-formatted/added comments in prologues of key subroutines
2000      to work with protex
2001    
2002    checkpoint40
2003    o moved calc_gs, calc_gt and calc_tr1 back to model/src
2004    o added FLT (floats) package from Arne along with demo. experiment
2005    o re-arranged Adams-Bashforth scheme for tracers to allow easier
2006      implementation of forward-in-time forcing terms
2007    o more mods for non-linear free-surface including new variable
2008    o modified multi-dim method to work on cube
2009    o bug fix in KPP (from DM)
2010    
2011    checkpoint40pre9
2012    o added DST advection schemes
2013    o fix MPI bug on SGI's
2014    o modifications for non-linear free-surface
2015    o fixed conditionals for fixed flow/passive tracer only mode
2016    o added tension/strain form of stress tensor
2017    o changes to commenting of arguments for TAF/TAMC
2018    o added/updated many matlab scripts
2019    o added multi-dimensional advection method for tracers
2020      
2021    checkpoint40pre8
2022    o new package rw/
2023      Added method for dumping intermediate local arrays:
2024      mdsio_writetile - same as mdsio_writefield except works from inside
2025                        bi,bj loop
2026      mdsio_writelocal - same as mdsio_writetile except works for local
2027                         arrays
2028      write_local_r? - higher-level wrapper for mdsio_writelocal
2029      Controlled by diagFreq. Defaults to zero (ie. no dumps)
2030      Example given at end of mom_vecinv.F that dumps some local arrays.
2031    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
2032      control flux-form versus vector invariant code.
2033      Switch is runtime flag vectorInvariantMomentum (defaults to false)
2034      or genmake -DISABLE ...
2035    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
2036      (additional storing is now needed for case vecinv;
2037      currently nothing implemented to switch this storing off
2038      in case fluxform is used since no CPP flag available).
2039    
2040    checkpoint40pre7
2041    o bug fix in dynamics.F
2042      calc_viscosity called before k=1,Nr loop.
2043    o added some #ifdef's ALLOW_PASSIVE_TRACER
2044    o cleaned initialisations in ctrl_map_ini
2045      related to TAF
2046    
2047    checkpoint40pre6
2048    o split dynamics into thermodynamics & dynamics
2049    o corresponding split of calc_diffusivity into
2050      calc_diffusivity, calc_viscosity
2051      (kpp_calc_diff, kpp_calc_visc).
2052    o Added diffkr, kapgm to control variables
2053    o bug fix in gmredi_slope_limit for ldd97
2054    
2055    checkpoint40pre5
2056    o proper initialization of Adams-Bashforth time stepping
2057      + uses forward step for very first step of model (iter=0)
2058    o re-generated *all* output since almost all output is modified by this
2059      change (sorry but we've been putting this one off for about 2 years)
2060      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
2061        *not* regenerated since they are already out of date and I don't
2062        want to create the impression that they are suddenly working.
2063    o removed KAP stuff for DEC's
2064    o modified/added many .cvsignore files in */code and */input
2065    o added new expt "solid-body.cs-32x32x1"
2066      + this uses an alternative form of ini_curvilinear_grid.F which
2067        is not necessarily any better than the current one...
2068    
2069    checkpoint40pre4
2070    o added re-initialisations of utrans,vtrans,rtrans in
2071      calc_common_factors which are crucial for TAF.
2072    o extended iMin,jMin range for calc_common_factors,
2073      calc_diffusivity
2074    o added option ALLOW_PASSIVE_TRACER
2075    o a few minor updates and fixes
2076    
2077    checkpoint40pre3
2078    o created calc_gtr1.F for gad package
2079    o split the_main_loop and re-introduced forward_step
2080    o some recomputations of nIter0 for TAMC
2081    
2082    checkpoint40pre2
2083    o Updated to latest branch of AJA, JMC
2084    o Added gradient check package
2085    o Added routines for passive tracer handling
2086    o Added carbon sequestration sensitivity experiment
2087    
2088    checkpoint39
2089     o Modifications and fixes to support TAMC
2090       (mainly missing or wrong directives)
2091     o Corrected common blocks when fooling TAMC to produce adjoint I/O
2092       in addummy_in_stepping
2093     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
2094     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
2095     o Included following packages:
2096       cal: calendar
2097       exf: external forcing
2098       ecco: essential routines to control use of cal, exf
2099             (NB: this is not the full ECCO environment)
2100     o disabled some packages by default in genmake
2101    
2102    checkpoint38
2103     o see notes_c37_adj.txt
2104     o corrected wrong layer index in external_forcing_t
2105     o replaced the_main_loop/forward_step by the_main_loop
2106     o removed forceoutput from write_state
2107       (replaced criteria for initial/final state)
2108     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
2109    
2110    checkpoint37
2111     o mdsio.F routine split and packaged in pkg/mdsio
2112       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
2113        used unless genmake -disable=mdsio)
2114     o allow a more precise surface-geopotential gradient for the atmosphere
2115       taking into account the change in space of Alpha (=1/rho) at the surface.
2116     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
2117       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
2118     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
2119       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
2120       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
2121     o Time-Average diagnostics defined as a pseudo package "timeave".
2122     o pickup files : old pickup (before c35) did not work with new code (c35
2123       and after) unless activating 2 commented lines in initialise-varia.
2124     o Non-Hydrostatic pickup file Pb fixed.
2125     o bug with Rigid-lid version (since c35) fixed.  
2126    
2127    checkpoint36
2128     o implement Crank-Nickelson barotropic time-stepping
2129     o recover Time-Average diagnostics
2130     o fix Pb in checkpoint (PR#19)
2131     o AIM become a standard package ; clean unused CPP_kees
2132    
2133    checkpoint35
2134     o subtantial rewrite of dynamics.f
2135     o allows staggered time-stepping
2136     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
2137     o added bottom drag (linear + quadratic)
2138    
2139    checkpoint34
2140     o Modified exchange routines for correct reverse simulation.
2141     o Added verification output to comply with bug fix in impldiff.F
2142       as of c33 (exp2, natl_box).
2143     o Corrected store directives in dynamics.F
2144     o Corrected array boundaries in impldiff.F
2145     o Corrected array dimensions in gmredi.
2146       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
2147     o Added routine GLOBAL_SUM_INT to global_sum.F
2148     o Added mdsio_gl.F for ECCO purposes.
2149    
2150    checkpoint33
2151     o Fixed bug in lower BC in impldiff.F
2152     o Fixed confusion about units of forcing arrays in FFIELDS.h
2153       namely Fu,Fv,Qnet,Qsw,EmPmR:
2154       - Removed verification/natl_box/code/external_fields_scale.F
2155         (did not differ from that in model/src)
2156       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
2157         (see FFIELDS.h for description)
2158       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
2159         kpp_calc.F and kpp_transport_t.F
2160       - Removed model/src/external_fields_scale.F and calls to it
2161       - verification/natl_box uses flux data with "atmospheric" sign so
2162         a special version of external_fields_load.F is used to
2163         change the data as it's read in. This way, the arrays
2164         have the right units and signs at all times tha a user could
2165         possibly use them.
2166     o Corrected genmake to delete a temporary file during configuration
2167    
2168    checkpoint32
2169     o Scaling of forcing fields moved from external_forcing.F to
2170       external_fields_scale.F, called directly after loading fields.
2171     o Surface relaxation terms added to surface tendency fields in
2172       extra subroutine.
2173     o impldiff.F changed to avoid storing by TAMC of huge intermediate
2174       fields.
2175     o Changes in GMRedi to comply with packaging structure.
2176     o Modifications and bug fixes in KPP package.
2177     o Verification experiment for KPP added (verification/nat_box/)
2178    
2179    checkpoint31
2180     o Packages interface brought in line with defined standard
2181       -> new routines packages_...F
2182       -> changes in initialise_fixed.F, initialise_varia.F
2183       -> enables initialisation interface for ECCO package
2184     o Rescaling of external forcing fields immediately after read
2185       (removed from external_forcing.F)
2186       -> new: surface_fields_scale.F
2187       -> affects ini_foorcing.F, external_fields_load.F
2188     o Computation of surface tendencies before tendency updates.
2189       -> new: external_forcing_surf.F
2190     o Change of variable names useGMRedi, useKPP, useECCO
2191     o Further changes in dynamics.F, impldiff.F for TAMC
2192     o Tested for experiments 0, 2, 4.
2193       - not yet tested for GMRedi.
2194       - not yet tested for KPP.
2195    
2196    checkpoint30
2197     o Updates for OBCs
2198     o New experiment for test OBCs (internal_wave)
2199     o New output.txt in verification/exp4/results/
2200     o Updates for KPP: calculation of viscosity corrected, new variables
2201       kpp_dumpFreq and kpp_taveFreq
2202     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
2203       and entry for T90 in genmake
2204    
2205    checkpoint29
2206     o packaged KPP and GM/Redi
2207    
2208    checkpoint28
2209     o Corrected initialization of hFacMin for difference vertical coordinates
2210     o Modified calculation of partial cell thickness to more robust algorithm
2211     o config_summary.F: replaced write_1D_... by write_0D_...
2212       read_write.F: added subroutines write_0D_...
2213     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
2214       included some initialisations required for TAMC.
2215     o routine calc_isoslopes: modified sqrt computation to make it
2216       differentiable for zero argument.
2217     o routines dynamics, impldiff:
2218       included store directives and tape key computations required for TAMC.
2219     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
2220    
2221    checkpoint27
2222     o fixed calc_isoslopes() to so that cancellation of terms in tensor
2223       formulation works properly with variable resolution.
2224     o restructured the calling tree between the_model_main() and dynamics()
2225     o split initialise() into initialise_fixed() and initialise_varia()
2226     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
2227       in new routine ini_psurf()
2228    
2229    checkpoint26
2230     o moved some #ifdef in optional routines to encompass everything
2231       except the argument declarations. This was using up some memory.
2232     o fixed macros like _ADT to work with both versions of Linux cpp
2233     o cleaned up some unused and uninitialized variables
2234       (helps when debugging with strict compile options)
2235     o split up CPP_EEOPTIONS.h into options and macros
2236       (macros are now in eesupp/inc/CPP_EEMACROS.h)
2237     o patch for 2 processor JAM mode
2238    
2239    checkpoint25
2240     o updates for OBCs and NH
2241     o dramatically reduced memory usage
2242     o added "JAM" routines for use on Artic network
2243     o parameterization of convection by implicit vertical diffusion
2244     o added a diagnostic of convective index
2245     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
2246       (this is was partly for OBCs and NH but also in anticipation of
2247        an explicit free-surface option)
2248     o initial state input files for U and V
2249    
2250    checkpoint24
2251     o Removed some spurious "REAL"s
2252     o Updated KPP to latest version from JPL
2253     o Added a COS(latitude) in horizontal viscosity
2254    
2255    checkpoint23
2256     o Added del^4 diffusion for salt and temperature
2257     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
2258    
2259    checkpoint22
2260     o Made many small changes: implicit none, format(i5), etc...
2261     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
2262    
2263    checkpoint21
2264     o Introduced new I/O package that supports direct-access records (mdsio.F)
2265     o Split-up mid-level I/O routines
2266     o Updated input data for experiments 0,1,2,4 and 5
2267     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
2268    
2269    checkpoint20
2270     o Tidied up open-boundaries some more
2271     o Added non-hydrostatic code
2272     o Fixed some input data
2273     o Modified MPI start-up to work in "coupled" context.
2274    
2275    checkpoint19
2276     o Tidied up directory structure for verification experiments.
2277     o Added new code for open boundaries.
2278     o Corrected advective terms near boundaries.
2279     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
2280     o Implemented free-slip/no-slip BCs and del^4 dissipation.
2281     o Split default parameters out of ini_parms.F into set_defaults.F.
2282    
2283  checkpoint18  checkpoint18
2284   o Further changes for optional code generation with   o Further changes for optional code generation with
2285     CPP - ugh!     CPP - ugh!

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