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revision 1.4 by cnh, Mon Jun 8 22:38:51 1998 UTC revision 1.272 by edhill, Mon Mar 29 22:10:28 2004 UTC
# Line 3  $Header$ Line 3  $Header$
3      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
4      ==============================      ==============================
5    
6    o doc/api_reference added
7      - a framework for building an API Reference Manual using all
8        the "protex" comments embedded in the code
9      - see pkg/generic_advdiff, pkg/mnc for examples
10    o MNC:
11      - make myThid the last argument for all subroutines
12      - new default for the grid files: NO halos
13      - add useMNC and other run-time flags
14      - separate per-file-group handling of the unlimited dimension
15      - early initialization of MNC w/ flags read at the eeboot stage
16        and lookup tables set in initialize_fixed
17      - write all MNC output to a freshly-created directory
18    o thermodynamics sea-ice (thsice) is now tested with testreport.
19    o test exp. advect_cs: use the standard cs32 grid ; update output.
20    o Added functionality to grdchk:
21      pick global i,j,k position (or nearest wet) where to perform check.
22    
23    checkpoint52l_post
24    o new land formulation:
25      a) use ground enthalpy as prognostic variable to ensure exact
26         energy conservation.
27      b) account for water temperature and for latent heat of freezing
28         in all processes (rain, run-off, ground storage)
29      c) compute surface and ground temperature implicitly.
30    o aim_v23 modification for new land model:
31      a) Treat separately land / ocean / sea-ice surface fluxes
32         to allow implicit computation of land & sea-ice surface temp.
33      b) add snow precipitation.
34    checkpoint52l_pre
35    
36    o fix problem (when 1 tile is empty) in min/max monitor.
37    o fix bug in timeAve (u,vZetatave in common block)
38    o no restoring terms under ice for pkg/seaice
39    o moved SEAICE_DO_DIAGS to S/R do_the_model_io
40    o bug fix for pkg/seaice pickups
41    o change MNC call locations and add coordinate attributes
42    o mask vorticity at the corner ; affects global_ocean.cs output
43    o fix ini_curvilinear_grid ; test CS experiments with mpi
44    o aim.5l_cs: modify sea-ice fraction input file ; update output
45    o exf: Adding simple range check routine for exf fields after read
46    
47    checkpoint52k_post
48    o removed top-level directory "diags"
49      - we migrated these functions to pkg/timeave a long time ago
50    o fixed bug introduced in pkg/monitor
51    o accuracy ctrlprec = 32 insuffient for gradient checks using
52      averaged fields (I/O via cost_averages)
53      -> use ctrl.h in active_file*.F to control I/O precision.
54    o paramter list of CALL ADTHE_MAIN_LOOP
55    o added initial do_the_model_io to ecco
56    o set all ...Freq to zero after cost_final
57      taveFreq, dumpFreq, pChkptFreq
58    o MAIN and ECCO differentiability restored
59    
60    checkpoint52j_post
61    o fix nchklev in tamc.h for global_ocean...
62    o Bringing flow and store directives up-to-date
63    o Really weird thing!
64      call do_the_model_io from the_main_loop with parameters
65      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
66      TAF places a faulty re-call of initialise_varia
67      after cost_final call which should not be there!
68    checkpoint52j_pre
69    
70    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
71      error messages
72    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
73    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
74      debug output
75    o modfied mdsio_writefield.F to handle non-global files under exch2
76    o update AIM Cubed-Sphere exp (aim.5l_cs):
77      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
78    o update AIM Equatorial Channel exp:
79      use standard aim_v23 pkg and change the SST fields to be more realistic.
80    o globalFile now works with exch2
81    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
82      mon_vort3.F to make exch2 friendly with >1 tile per cube face
83    o limit timeave output for hi-res integrations
84    
85    checkpoint52i_post
86    o removed CPP_EEOPTIONS.h from verification/*/code
87    o updated the tiling for global_ocean_pressure
88    checkpoint52i_pre
89    
90    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
91      the old pkg/aim).
92    
93    checkpoint52h_pre
94    o shortened offending lines in exch2_send_rx?.template
95    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
96    o genmake2: add build & execute test for NetCDF code
97    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
98      old grid files, moved CPP_EEMACROS.h to pkg/exch2
99    o added useSingleCPUIO flag to monitor.F and mon_out.F
100    o added temporary hack for sea-ice dynamics on the cube:
101      metric terms are ignored and it is assumed that
102      there is no sea-ice on cube faces 1, 2, 4, and 5.
103    
104    checkpoint52f_post
105    o added exch2 cube routines to pkg/exch2
106    o modified hs94.cs-32x32x5 to use it
107    o added new grid files to hs94.cs-32x32x5
108    checkpoint52f_pre
109    
110    checkpoint52e_post
111    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
112      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
113    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
114      to work with implicit vertical advection and AB ;
115    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
116    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
117     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
118    checkpoint52e_pre
119    
120    o fix bug in impldiff when Nr=1 or Nr=2.
121    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
122    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
123    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
124      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
125    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
126    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
127    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
128    
129    checkpoint52d_post
130    o re-tiled many expts to allow comparison in multi-processor mode
131      - updated output accordingly
132      - changed hs94.128x64x5 to use intial T from file rather than use the
133        random number generator
134    o add infrastructure in model routines for fizhi and gridalt packages
135    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
136    o changes to permit hi-res, cubed-sphere, configuration
137      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
138      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
139      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
140        of surface winds for the cube
141      (A verification experiment, based on global_ocean.cs32x15, but with
142       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
143       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
144       complete with example surface forcing files and matlab scripts to look
145       at the output and compare it with that of global_ocean.cs32x15.)
146    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
147       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
148       to conform to the common rule.
149    o check-in the first version of the coupler + interfaces for multi-components
150       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
151       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
152       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
153       - ocean and atmos. share the same horizontal grid (no interpolation).
154       - exchanges between component and coupler is done in forward_step
155    o new verification experiment, cpl_aim+ocn:
156       coupled ocean - AIM atmosphere on cs32 grid.
157    
158    checkpoint52d_pre
159    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
160    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
161    
162    checkpoint52c_post
163    o Fixing OPTIONS files for use of exf:
164      - ALLOW_ECCO not needed
165      - ECCO_CPPOPTIONS.h should not be included from
166        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
167        as has been the case in the past
168      - All cal/exf related options are currently set in
169        single header file. Should remain so until we
170        agree on a consistent new policy.
171    o Removed all CPP options for cal package.
172      cal has no more CPP options.
173    o modified STOREs in GAD_ADVECTION
174    o corrected key comp. for passkey
175    
176    checkpoint52b_post
177    o new version: "thsice" of thermodynamic sea-ice pkg:
178     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
179     - modify fluxes but do not change theta directly;
180     - light cleaning of bulk_force pkg (still needed with thsice).
181     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
182       + output_thsice.txt to test thsice & bulk_force pkgs.
183    o put back grid & coriolis monitor output.
184    checkpoint52b_pre
185    
186    o call "do_the_model_io" at the beginning (=> dump initial state)
187    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
188    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
189      (need info on NUMBER_OF_PTRACERS)
190    o missing PTRACERS headers in some routines
191    o default tamc.h in pkg/autodiff supposed to crash
192      to ensure proper customization
193    
194    checkpoint52a_post
195    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
196      - moved surfaceTendencyTice from pkg/seaice to main code
197      - subroutine FREEZE_SURFACE now limits only surface temperature
198        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
199        => new output.txt for global_ocean.cs32x15 & global_with_exf
200      - keep the old version of FREEZE for backward compatibility;
201        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
202      - corresponding modifs for TAF directives
203    o added surface flux output variables to TIMEAVE_STATVARS
204    o time-averaged output for pkg/ptracers
205    o fix problem with ECCO-related divided adjoint
206      snapshot file was missing some ad-variables,
207      but no warning issued by TAF
208    
209    checkpoint52a_pre
210    o some bug fixes for #undef REAL4_IS_SLOW
211    
212    checkpoint52 = ecco_c52_e35
213    o after testing adjoints of checkpoint51u_post
214    
215    checkpoint51u_post
216    o this is the post-merge tag of the ecco-branch
217      (needs another clean checkout and re-testing)
218    o various natl_box_adjoint configs and results
219      but no input fields
220    o obcs adjoint not yet merged!
221    o adding ECCO global 1x1 and 2x2 degree configs
222    o updated/extended some store directives for seaice
223    o pkg/ecco now containes ecco-specific part of cost function
224    o top level routines the_main_loop, forward_step
225      supersede those in model/src/
226      previous input data.cost now in data.ecco
227      (new namelist ecco_cost_nml)
228    o in ctrl/ cleaned some cross-dependencies and updated CPP options
229    
230    checkpoint51t_post
231    o this is the pre-merge tag of the ecco-branch
232    
233    checkpoint51s_post
234    o cleanup: removed various obsolete #define-s
235    o pkg/grdchk
236      - renamed 'ph-grd 3' to 'grad-res'
237      - merged from ecco-branch
238        (remaining bug fixes for obcs gradient checks)
239      - additional high-precision output for testreport
240        (grep for 'precision_grdchk_result')
241    
242    checkpoint51r_post
243    o cleaned up or removed CPP_OPTIONS.h files
244    o updated results for some of the tests to reflect the new
245      optfiles (-ieee: -O0 instead of -O3)
246    
247    checkpoint51q_post
248    o cd_code:
249      - moved cd_scheme.F -> cd_code_scheme.F
250      - separate read_checkpoint from cd_code_ini_vars.F
251      - separated cd_code part from write_checkpoint
252      - updated AD_SOURCE, generated .flow
253      - added CD_CODE_VARS.h to the_main_loop
254      - Moving cd_code specific store dir.s to pkg/cd_code
255    o ctrl package totally restructured
256      - pack/unpack now optional and decoupled from
257        xx_/adxx_ I/O
258      - ctrl_pack/unpack cleaned
259        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
260      - confined inclusion of AD_CONFIG.h to where necessary.
261    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
262    
263    checkpoint51p_post
264    o create initial cd_code package
265      - WARNING: the initialization of fields within packages
266        is broken because INI_FIELDS (where READ_CHECKPOINT is
267        called) is called *before* PACKAGES_INIT_VARIABLES.
268        This seems to be backwards since
269        1) its important to initially zero the entire field including
270           the "halo" region
271        2) zeroing needs to be done *before* reading pickup info
272           and the pickup call might or might not happen in any
273           particular run
274      - this needs an overhaul for R2
275    o cleanup verification/*/code/GMREDI_OPTIONS.h
276    o cleanup testreport
277    
278    checkpoint51o_post
279    o bringing AD-related verif's up to date with genmake2
280      - carbon/
281      - global_ocean.90x40x15/
282      - hs.94.1x64x5/
283      - (front_relax/ )
284    o (more) consistent directory structure for AD-related verif.'s
285    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
286    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
287    o bug fix in find_alpha.F for MDJWF:
288      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
289        change rho -> rho-rhoConst
290      - replace call find_rho to find_rhonum
291    o initialisation of rFlx extended to full array (required by TAF)
292      and shifted to thermodynamics
293    o removed PTRACERS.h in ptracers routine
294    o added surfacetendencyPtr to S/R parameter list pracers_forcing
295    o Correcting initialisations for fVerU, fVerV.
296    o helping TAF to recognize dependency on kUp for
297      fVerU, fVerV
298    o Replacing delZ by delR in pkg/ctrl/
299    checkpoint51o_pre
300    
301    o undid all of cp51 pending some cleanups and discussion
302    o added the [#include "AD_CONFIG.h"] statement to all files that need
303       it for adjoint/tl #defines
304     o re-worked the build logic in genmake2 to support AD_CONFIG.h
305     o removed tools/genmake since it no longer works
306    
307    checkpoint51n_post
308    o modifications to make FREEZE flux visible to pkg/kpp
309      - moved surfaceTendencyTice from pkg/seaice to main code
310      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
311      - subroutine FREEZE now limits only surface temperature
312        (this means new output.txt for global_ocean.90x40x15,
313         global_ocean.cs32x15, and global_with_exf)
314    o added surface flux output variables to TIMEAVE_STATVARS
315    
316    checkpoint51n_pre
317    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
318    o added [#include "AD_CONFIG.h"] to all files that use the following
319      defines:
320      - ALLOW_ADJOINT_RUN
321      - ALLOW_TANGENTLINEAR_RUN
322      - ALLOW_ECCO_OPTIMIZATION
323    
324    checkpoint51m_post
325    o incorporating changes to get TAMC/TAF working in genmake2
326      - added new TAMC/TAF targets to the Makefile
327      - various cleanups related to package handling
328      - these changes should have no impact on the forward model
329    
330    checkpoint51l_post
331    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
332     - faster algorithm for cal_addtime.F
333     - higher precision arithmetic, where needed
334     - pkg/exf *startdate variables changed from calendar date to
335       model integration time
336    
337    checkpoint51l_pre
338    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
339    o enable to apply restoring on S & T only in a latitude band.
340    o update output (external_forcing_surf modif. change truncation errors)
341       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
342    
343    checkpoint51k_post
344    o change default to: useNHMTerms=.FALSE.
345     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
346       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
347     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
348        exp1, ideal_2D_oce
349     - change data file of oceanic exp (leave the results unchanged for now)
350       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
351    o set gravitySign automatically according to the vertical coordinate used
352      (and change sign: back to "logical" value: +1 when R increases downward)
353    o added an include barrier to the default CPP_OPTIONS.h and
354      removed the #include "PACKAGES_CONFIG.h" from it
355    o fix a bug in mom_fluxform (from chk51j_post)
356    
357    checkpoint51j_post
358    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
359    o adjusted some flow directives (dynamics, thermodynamics)
360    o added cubed-sphere case to test cost function
361    o heckpoint_lev?_directives.h now include
362      pkg-specific directives, whenever those are enabled.
363    o Moving pkg-specific flow directives to corresponding pkg
364      Moving pkg-specific differentiation list to corresponding pkg
365      Moving pkg-specific checkpoint-lev storing to corresponding pkg
366      ---> conventions are
367           - pkg_ad.flow
368           - pkg_ad_diff.list
369           - pkg_ad_check_lev?_dir.h
370    
371    checkpoint51i_post
372    o merge of the branch-genmake2
373      - knowingly breaks the older genmake
374      - automatic generation of all ALLOW_${PKG_NAME} defines
375      - new testreport supersedes older testscript
376    o large number of package inclusion and header cleanups
377    checkpoint51i_pre
378    
379    o new output for adjoin of global ocean vector invariant
380    o fix for checkpoint of thermodynamic seaice and bulk_force
381    o Steph gchem various cleanups
382    
383    checkpoint 51h_pre
384    o fixed some single quotes
385    o modify gchem pkg to be more versatile
386    o modifications to clean up dic pkg
387    o add pkg/cfc
388    
389    checkpoint51g_post
390    o provide links for ARPACK and ADM*TLM
391    o start removing verification/vero/
392    o update AD-related stuff
393      (in particular some IF-statements in model/src/ routines)
394    o adding to verification/global_ocean.90x40x15/ adjoint of
395      vector invariant setup
396    
397    checkpoint51f_post
398    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
399    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
400      of tracer Green's fucntions for ocean inversion project.
401    
402    checkpoint51f_pre
403    o Added on-the-fly spatial interpolation capability
404        "USE_EXF_INTERPOLATION" to pkg/exf.
405      - This is a temporary Cartesian-grid hack until
406        the super-duper ESMF coupler becomes available.
407      - See verification/global_with_exf/README for usage example.
408      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
409        flags and modified pkg/seaice accordingly.
410    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
411        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
412        non-local transport term.
413    
414    checkpoint51e_post
415    o pkg/mom_vecinv:
416      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
417      - add time-ave diagnostic of vorticity advection.
418    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
419    o atmospheric geopotential: - include water vapor effect;
420                                - use p^kappa in p* scaling.
421    o land pkg: read initial state from files.
422    o AIM : add stratospheric drag in the upper level
423    
424    checkpoint51d_post
425    o change function ILNBLNK (=> last non-blank char.) to return zero
426      (instead of the string length) when the string. char is empty
427    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
428    o modif's to restore TAMC compatibility
429      - avoid "_d" constructs in PARAMETER declarations
430      - avoid interrupting lines by comment lines
431    o Use cluster local disks for purely local I/O
432      vs. globally visible disks needed for ctrl stuff
433      (merged from ecco-branch)
434      - new active_file_loc... and mdsio_..._loc routines
435      - affected packages: autodiff, ctrl, grdchk, mdsio
436    
437    checkpoint51c_post
438    o introducing integer flag debugLevel
439      - debLevZero: suppress all output
440      - debLevA: standard
441      - debLevB: equivalent to current debugMode=.TRUE.
442    o introducing pathname variable mdsioLocalDir for mdsio
443      that can be specified at runtime
444      (relevant for cluster I/O to local disk)
445    `
446    >>>checkpoint51b_post
447    adjoint of ptracers
448    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
449    o extended state in checkpoint_lev?, etc.
450    o alternative ctrl/cost with tr1 or ptracer
451    o new comlev1_bibj_ptracers
452    o new ptracers.flow
453    o made ptracers_forcing same as external_forcing_s
454    o added verification for adjoint with ptracers
455      - adm. grdchk fail so far
456      - tlm. grdchk OK
457      - checked tapelev/comlev recomputations: OK
458    <<<checkpoint51b_pre
459    
460    checkpoint51a_post
461    o added code for biogeochemistry package
462      - new pkgs: dic, gchem
463      - new subroutine in ptracers
464    o modify code for biogeo packages
465      - in model/src and pkg/ptracers
466    
467    checkpoint51
468    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
469      - autodiff, ctrl, exf, grdchk, seaice
470      kept separate packages
471      - cost, ecco, obcs
472    o updating verification/internal_wave, verification/lab_sea
473      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
474    
475    checkpoint50i_post
476    o Preparing next differentiable checkpoint and sync
477      of MAIN vs. ecco-branch
478      - 1st step: this one is differentiable
479      - 2nd step: next(! not this) checkpoint will have updated packages
480                  from ecco-branch)
481    
482    checkpoint50h_post
483    o new package "land": provide surface BC for AIM.
484    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
485    o AIM: use true log-P extrapolation for near surface temp (= as in
486        F.Molteni paper) ; update aim.5l_cs output.
487    o New variable in PARM03 for more flexible pickups
488    o somewhat cleaned package initialisation sequence for
489      ctrl/ cost/ ecco/ in packages_... routines
490    
491    checkpoint50g_post
492    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
493      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
494      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
495        made the default because of faster convergence than ADI
496    
497    checkpoint50f_post
498    o exf totally restructured
499      - replaced all exf_set_ routines by one generic exf_set_gen.F
500        and made sure it's still differentiable
501      - split exf_getffields.F into new exf_bulkformulae.F
502      - exf_inscal_/exf_outscal_ suffixes consistent with field names
503      - updated adjoint/makefile and relevant verif. accordingly
504    
505    checkpoint50f_pre
506     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
507          + change Evap over land. (update aim.5l_cs output)
508     o added missing .cvsignores and made uniform across expts
509     o changed configuration of tidal_basin_2d expt
510     o added pkg/debug functions for tracing code in fatal crashes
511     o tidied pkg/monitor to use MONITOR_OPTIONS.h
512     o new fn in pkg/monitor to stop model if solution grows too big
513     o removed lots of single quotes from comments
514    
515    checkpoint50e_post
516    o make KPP work with PTRACERS
517     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
518       nearly a copy of kpp_transport_s
519     - there is no analogue to SurfaceTendencyS, so I have to use
520       gPtr(of the surface layer) instead
521    o add a new platform SunFire+mpi (SunFire 15000) to genmake
522    checkpoint50e_pre
523    
524    checkpoint50d_post
525    o change kpp output from multiple-record state files to single-record state
526      files analogous to write_state.F
527    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
528      analogous to the cg2d-related output.
529    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
530      so that writing to internal file fn (with length 512) fails.
531    checkpoint50d_pre
532    
533    checkpoint50c_post
534    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
535    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
536    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
537    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
538    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
539    
540    checkpoint50c_pre
541    Merging from release1_p13:
542    o bug fix for pkg/seaice dynamic solver
543    o Added SEAICE_initialHEFF to pkg/seaice
544    
545    checkpoint50b_post
546    o store u*,v* in gU,V instead of in guNm1,gvNm1
547    o in order to put the momForcing out of the Adams-Bashforth:
548      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
549      to timestep.F
550    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
551    o re-generate output for highly sensitive test-exp:
552       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
553    
554    checkpoint50b_pre
555    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
556    o corrected CPP option mismatch in exf_Bulk... functions for case
557      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
558    
559    checkpoint50a_post
560    o Bug fix for merging between c50 and KPP.
561      ikey was passed from thermodynamics to kpp_calc via
562      common block rather than being recomputed in kpp_calc,
563      in contradiction with new key itdkey.
564      New key ikppkey created, and tamc.h headers updated.
565    
566    checkpoint50
567    - 2nd step of merge with ecco-branch:
568      merge changes in ecco-branch back into main trunk
569    - bug fix in find_alpha
570    - more storing in gmredi_calc_tensor.F, kpp_routines.F
571    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
572    - merged some sliced AD support routines
573    
574    checkpoint49
575    merged from ecco-branch:
576    o exf:
577      - Enable initialisation of forcing fields to constant
578        (runtime) values.
579      - in exf_getffields.F
580        Reduce i-/j-loop to interior domain, discarding overlaps.
581        That also fixes wrong TAF-key computations for key_1, key_2
582        with bulf formulae.
583      - exf_init.F modify #ifdef for exf_init_evap
584      - exf_getffieldrec.F, ctrl_getrec.F
585        The following INT-usages are not safe:
586          fldsecs  = int(fldsecs/fldperiod)*fldperiod
587          fldcount = int(fldsecs/fldperiod) + 1
588        and were modified.
589    o autodiff: checkpoint_lev...
590      - updated storing for bulk formulae (some arrays were missing)
591      - added state for seaice package
592      - synchronized with main branch
593    o DIVA:
594      Modif.s in
595      - the_main_loop.F
596      - the_model_main.F
597      and added cost_final_restore.F cost_final_store.F
598      o With these changes, it is possible to fully separate
599        the first forward run to compute the cost function (mdthe_main_loop)
600        and adjoint runs over individual DIVA intervals (adthe_main_loop)
601        into separate model executions.
602        This enables better tuning of DIVA to given queue sizes.
603      o Loss of cost function value in consecutive DIVA runs is
604        fixed by storing to 'costfinal' file.
605      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
606        beginning/end of adjoint integration is accounted for.
607      The current changes apply to TAF-1.4.26.
608      TAF has one remaining bug, requiring one manual change
609      (see MITgcm manual).
610    o cal: synchronized between MAIN and ecco-branch
611    
612    checkpoint48i_post
613    o Changes to restore differentiability of code w.r.t. previous tag
614      (mostly adding new routines to make list and replacing
615      pressure by totPhiHyd).
616    o Updated and merged grdchk package
617      - has both ADM and TLM checks
618      - works for single- and multi-proc.
619      - output cleaned
620      - worked successfully for parallel DIVA
621    o genmake:
622      - Adding -platform=SP4
623      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
624    o Modif. for DIVA:
625      ctrl_unpack should not be called in intermediate DIVA interval.
626      (similar thing would apply for active files such as
627      tbar, sbar, psbar, which should not be reinitialised;
628      only relevant for ecco-branch)
629    
630    checkpoint48h_post
631    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
632    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
633    o Added SEAICE_initialHEFF to pkg/seaice
634    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
635    
636    checkpoint48g_post
637    --- EOS:
638    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
639      store total Potential in totPhyHyd for diagnostics & EOS.
640    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
641    --- Pressure/geopotential gradient:
642    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
643    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
644      ( changes results of global_ocean_pressure )
645    o NLFS + z-coord.: add eta*Rho' contribution.
646    o accurate phiHyd when using interface-W at the middle between 2 centers
647     ( changes results of ideal_2D_oce )
648    o includes r* 2nd term in potential gradient.
649    
650    checkpoint48f_post
651    Merging from release1_p12:
652    o Modifications for using pkg/exf with pkg/seaice
653      - improved description of the various forcing configurations
654      - added basic radiation bulk formulae to pkg/exf
655      - units/sign fix for evap computation in exf_getffields.F
656      - updated verification/global_with_exf/results/output.txt
657    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
658      (SBO) core products, including oceanic mass, center-of-mass,
659      angular, and bottom pressure (see pkg/sbo/README.sbo).
660    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
661      to avoid negative values in shallow regions.
662      - updated verification/natl_box/results/output.txt
663      - updated verification/lab_sea/results/output.txt
664    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
665    o Added useSingleCpuIO option (see PARAMS.h).
666    o Updated useSingleCpuIO option in mdsio_writefield.F to
667      work with multi-field files, e.g., for single-file pickup.
668    o pkg/seaice:
669      - bug fix in growth.F: QNET for no shortwave case
670      - added HeffFile for specifying initial sea-ice thickness
671      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
672    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
673      kpp_transport_t.F, forward_step.F, and the_main_loop.F
674    o pkg/seaice:
675      - adjoint-friendly modifications
676      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
677    
678    checkpoint48e_post
679    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
680    o dynamics: change definition of computational domain & adapt mom_fluxform
681      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
682    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
683        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
684        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
685        global_ocean.90x40x15 global_with_exf global_ocean_pressure
686        inverted_barometer solid-body.cs-32x32x1
687      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
688    
689    checkpoint48d_post
690    o in preparation for r*:
691     a) use pre-computed gradient of hydrostatic potential:
692        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
693     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
694        => affects results of glob_oce_pressure (different truncation error)  
695      update output.txt of ideal_2D_oce & global_ocean_pressure
696    
697    checkpoint48d_pre
698    o in preparation for r*:
699      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
700      pass the 2 comp. of the grad. as arguments to momentum S/R.
701      but for the moment, only used if it does not change the results.
702    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
703    
704    checkpoint48c_post
705    Modifications in treatment of initial flux forcing controls
706    to avoid extra storing of flux fields.
707    
708    checkpoint48c_pre
709    o Added tidal_basin_2d experiment (currently 1D!)
710    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
711    
712    checkpoint48b_post
713    o r* coordinate added in #ifdef NONLIN_FRSURF block.
714     (modification to pressure gradient not yet implemented)
715    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
716      (for U & V) that are used for vertical advection of momentum.
717    
718    checkpoint48a_post
719    o In preparation for r*, use temp. array to compute vertical transport
720       in flux-form momentum pkg. => change results of few test-exp.
721      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
722                        lab_sea, natl_box & plume_on_slope
723    
724    checkpoint48
725    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
726    
727    checkpoint47j_post
728    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
729    o moved adexch from forward_step to addummy_in_stepping
730    o added exch in ctrl_map_...
731    o aveFreq.=0. at end of cost_final to avoid overwrite in
732      reverse checkpointing loop
733    o Yet more changes in gmredi:
734      * adgmredi_calc_tensor
735        avoiding all recomputation of gmredi_slope_limit
736      * adgmredi_x/y/rtransport
737        added flag for excessive storing to avoid recomp. of
738        u/v/rtans, dTdx/y/z
739        -> this is not really necessary and very memory-consuming
740      * adgmredi_slope_psi:
741        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
742      * gmredi_slope_limit
743        re-activated full calculation of taperfct for case 'ac02'
744    o updating verification/ adjoints of carbon, global_ocean.90x40x15
745    
746    checkpoint47i_post
747    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
748    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
749      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
750    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
751    o gmredi: fix few bugs.
752    
753    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
754    This will be a good checkpoint to plug into the ecco-branch.
755    o few modif.'s to get latest version adjointed
756      (mainly kick out code in ini_linear_phisurf)
757    o modif's to run adjoint with exactConserv
758    o case GM_BOLUS_ADVEC should be cleaned
759      S/R gmredi_slope_psi should be cleaned
760    o verification/carbon now has exactConserv=.TRUE.
761    
762    checkpoint47g_post
763    o time-average AIM output: becomes independent from statvars time-average
764      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
765    o After TAF bug fix:
766      Tested adjoint of gmredi package.
767      Tests were done with checkpoint47 rather than with latest
768      checkpoint47f_post since the latter is broken for the adjoint
769      verification/carbon/ contains both ADM and TLM gradient checks.
770    Here they are, before they get changed/lost/stolen.
771    Mostly modif.'s to fix numerical sensitivities.
772    Gradient checks OK for
773    - GM_taper_scheme:
774      * clipping
775      * ac02
776      * linear
777      * glw91
778      * dm95
779      * ldd97
780    - GMREDI_OPTIONS:
781      * GM_VISBECK_VARIABLE_K
782      * GM_NON_UNITY_DIAGONAL
783      * GM_EXTRA_DIAGONAL
784      * GM_BOLUS_ADVEC
785    in conjunction with data.gmredi parameters to be checked in
786    in a few minutes under verification/carbon/code/
787    
788    checkpoint47f_post
789    Merging from release1_p10:
790    o modifications for using pkg/exf with pkg/seaice
791      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
792        and SEAICE_EXTERNAL_FLUXES
793      - pkg/exf CPP options EXF_READ_EVAP and
794        EXF_NO_BULK_COMPUTATIONS
795      - usage examples are Experiments 8 and 9 in
796        verification/lab_sea/README
797      - verification/lab_sea default experiment now uses
798        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
799    
800    checkpoint47e_post
801    o created a tag prior to creating a branch
802    
803    checkpoint47d_post
804    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
805      at the bottom boundary had an erroneous half slip boundary condition
806    o added bottom drag and no slip boundary condition capabilities to
807      oceanic pressure coordinates code
808    o added new verification experiment global_ocean_pressure, this experiment is
809      also described in the tutorial section of the manual
810    checkpoint47d_pre
811    
812    checkpoint47c_post
813    o Added a verification experiment for a global cubed-sphere ocean run
814      -  verification/global_ocean.cubed32x32x30
815      -  uses pkg/therm_seaice and pkg/bulk_forcing
816    
817    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
818    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
819      when using P-coordinate; only implemented for atmospheric config.
820    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
821      NOTES: requires option NONLIN_FRSURF to be "#define".
822    o update advect_xz/results/output.txt (left from checkpoint44g_post)
823    
824    checkpoint47b_post
825    Merging from release1_p9:
826    o pkg/seaice
827      - removed GOTO's and added taf directives
828      - double precision constants to reduce the g77 (Linux)
829        to F77 (SGI) differences reported in release1_p8
830    o tools/genmake
831      - added SGI options
832    o verification/testscript
833      - updated to that of checkpoint47a_post
834    o verification/global_ocean.90x40x15/input/eedata
835      - modified for SGI f77 compatibility
836    o verification/lab_sea
837      - added description of sea-ice model
838      - added missing matlab routines
839      - added test of thermodynamics parallelization
840    
841    checkpoint47a_post
842    o new pkg: aim_v23
843     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
844       for now, keep the same surface forcing as before.
845     - Part-Cell implemented into AIM; check that Heat & Water are conserved
846     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
847     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
848    o add diagnostic of surface correction term in monitor output
849    
850    o bulk_force and therm_seaice
851    - Two packages:  bulk_force (Bulk forcing)
852      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
853    - Earlier integration from Stephaine Dutkiewicz
854      and Patrick Heimbach.
855    - Two ifdef statements for compile time,
856       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
857    
858    checkpoint47
859    differentiable version of checkpoint46n_post
860    o bug fix in quasihydrostaticterms
861    o * "clean" adjoint code (in terms of extensive recomputations)
862        can now be obtained for all GMREDI options (i.e. for
863        - GM_VISBECK_VARIABLE_K
864        - GM_NON_UNITY_DIAGONAL
865        - GM_EXTRA_DIAGONAL
866        - GM_BOLUS_ADVEC )
867      * However, wrong gradient check problem remains unsolved.
868      * New CPP options have been introduced for different
869        tapering schemes
870    o external_fields_load now part of differentiation list
871    o pressure needs multiple storing;
872      would be nice to have store_pressure at beginning or
873      end of forward_step, e.g. by having phiHyd global (5-dim.)
874      (NB: pressure is needed for certain cases in find_rho,
875      which is also invoked through convective_adjustment).
876    o recomputations in find_rho for cases
877     'JMD95'/'UNESCO' or 'MDJWF' are OK.
878    o #define ATMOSPHERIC_LOADING should be differentiable
879    o ini_forcing shifted to begining of initialise_varia
880    o Incorporating QNVS line search routines into MITgcm
881      (this is separate code, and therefore not under pkg)
882      lsopt/, optim/
883    o Updated verification/carbon/
884      - #define GM_VISBECK_VARIABLE_K
885      - GM_taper_scheme    = 'ldd97'    
886    
887    checkpoint46n_post
888    Merging from release1_p8:
889    o verification/natl_box:
890      updating new external_fields_load routine
891    o New package: pkg/seaice
892      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
893      The sea-ice code is based on Hibler (1979-1980).
894      Two sea-ice dynamic solvers, ADI and LSR, are included.
895      In addition to computing prognostic sea-ice variables and diagnosing
896      the forcing/external data fields that drive the ocean model,
897      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
898      The implied surface heat flux is then stored in variable
899      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
900      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
901      non-local transport term.  Because this call precedes model
902      thermodynamics, temperature under sea-ice may not be "exactly" at
903      the freezing point by the time theta is dumped or time-averaged.
904      N.B.: fairly large differences in accuracy occur across
905            different platforms/compilers; comparison between
906            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
907            generated output gives:
908       T           S           U           V
909      C D M    c        m  s        m  s        m  s        m  s
910      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
911      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
912      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
913    
914      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
915    o GAD:
916      - generated new common blocks to account for call of
917        same gad routines with differing traceridentities
918        (needed to modify tracerIdentity indices in GAD.h)
919      - generated separate common blocks for case useCubedSphereExchange
920        (Department of Futurology)
921      - parameter lists to gmredi_?transport: added tracerIdentity
922      - added new key indices to tamc.h
923    o external_fields_load:
924      - added this routine to TAF list
925      - needed to make some common blocks global and additional storing
926        along the same lines as exf package (checkpoint_lev?_directives.h)
927    o exf:
928      updated external forcing package
929      - bug fixes carried over from ecco-branch
930        (missing OBCS_OPTIONS.h in two routines)
931      - enable easy to use "no forcing".
932      - added exf I/O for atmospheric loading
933      - added exf I/O for runoff data
934      - transfered scaling between exf <-> MITgcm to exf namelist
935    o Adding new verification experiment global_with_exf.
936      This verification experiment is almost identical to the
937      global_ocean.90x40x15 experiment, except that it uses
938      the exf (and cal) package instead of the
939      external_fields_load routine (cf README file).
940    
941    checkpoint46m_post
942    o modified testscript to return -- when there are no lines of "%MON" output
943    o added new flag "quasiHydrostatic" for QH mode
944      and new routine quasihydrostaticterms()
945    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
946      New routine: mom_u_coriolis_nh()
947    o fixed sign of non-hydrostatic metric terms in u and v equations.
948      Depend on correct sign of gravitySign.
949    o added work.pc* to .cvsignore in aim directories using ifc
950    o introduced flag for controllin non-hydrostatic metric terms
951    o removed gravitySign from PARM04
952    o switched to g77/ifc from pgf77 in aim experiments
953    
954    checkpoint46l_post
955    o made convective adjustment work with pressure coordinates:
956     - changed the direction of k-loop in convective_adjustment.F for the
957       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
958     - adjusted the reference pressure k-index in convective_adjustment.F
959     - adjusted the convection condition in convect.F (in analogy to
960       calc_ivdc.F)
961     - convective_adjustment no longer computes anything on the halos
962     - removed the warnings about negative salinity from find_rho.F and
963       find_alpha.F; instead the new routine look_for_neg_salinity, called
964       at the beginning of find_rho, find_alpha, and find_beta, does a
965       check of the entire slice, if CPP-option
966       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
967    checkpoint46l_pre
968    
969    checkpoint46k_post
970    o fixed the verification/global_ocean.90x40x15 experiment:
971     - new bathymetry (the world according to A., JMC, and M.)
972     - new initial fields and forcing fields (*.bin files)
973     - new POLY3.COEFFS (for the next release one should switch to a full
974       equation of state: JMD95P or MDJWF)
975     - fixed several errors and redundancies in the data file
976     - experiment uses looped cells
977     - added matlab directory with diagnostic scripts for plotting of output
978    
979    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
980     - read AIM physics parameters from a file (data.aimphys)
981     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
982    
983    checkpoint46j_post
984    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
985    o move wVel computation at the end of the time step, in S/R integr_continuity
986    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
987    o update timeave pkg for wVel diagnostic.
988    checkpoint46j_pre
989    
990    checkpoint46i_post
991    o Clean up AIM package (and keep the results unchanged):
992      include CPP_OPTION and use IMPLICT NONE in all routines ;
993      declare all the variables _RL ; use _d 0 for all numerical constants.
994      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
995    
996    checkpoint46h_post
997    o cleaned up the use of rhoNil and rhoConst.
998      - rhoNil should only appear in the LINEAR equation of state, everywhere
999        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
1000        and the dynamical equations are all divided by rhoConst
1001    o introduced new parameter rhoConstFresh, a reference density of fresh
1002      water, to remove the fresh water flux's dependence on rhoNil. The default
1003      value is 999.8 kg/m^3
1004    o cleanup up external_forcing.F and external_forcing_surf.F
1005      - can now be used by both OCEANIC and OCEANICP
1006    checkpoint46h_pre
1007    
1008     Added code to convert surface volume flux (fresh water) into
1009     a mass flux when using P coordinates in the ocean (OCEANICP).
1010     Note: It assumes you have set rho0=rhoConst=density of fresh water.
1011    
1012    checkpoint46g_post
1013    o Include a new diagnostic variable phiHydLow for the ocean model
1014      - in z-coordinates, it is the bottom pressure anomaly
1015      - in p-coordinates, it is the sea surface elevation
1016      - in both cases, these variable have global drift, reflecting the mass
1017        drift in z-coordinates and the volume drift in p-coordinates
1018      - included time averaging for phiHydLow, be aware of the drift!
1019    o depth-dependent computation of Bo_surf for pressure coordinates
1020      in the ocean (buoyancyRelation='OCEANICP')
1021      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
1022        Theta, Salinity, and Pressure in the parameter list. This routine is
1023        presently contained in find_rho.F. This routine does not give the
1024        correct density for 'POLY3', which would be a z-dependent reference
1025        density.
1026    o cleaned up find_rho
1027      - removed obsolete 'eqn' from the parameter list.
1028    o added two new verification experiments: gop and goz
1029      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
1030    checkpoint46g_pre
1031    
1032    checkpoint46f_post
1033    o Enable tangent linear (forward mode) gradient checks:
1034      - extended active file handling to g_... files
1035      - added TANGENT_SIMULATION to theSimulationMode
1036      - extended grdchk package accordingly
1037    o added tangent linear setup in verification/carbon/code_ftl
1038    o added adjoint setup in verification/front_relax/code_ad
1039    
1040    checkpoint46e_post
1041    o Added new equation of state -> MDJWF
1042      - EOS of McDougall et al., 2002, JAOT, submitted
1043      - caveat: the equation of state is only valid for a smaller (more
1044        realistic?) range of values than JMD95P/Z and UNESCO
1045      - added masks to the calculation of pressure in store_pressure
1046      - added more check values for density in check_eos (ini_eos.F), some of
1047        the old check values are out of the range of the MDJWF-eos, so don't
1048        expect perfect matches for those
1049    checkpoint46e_pre
1050    
1051    checkpoint46d_post
1052    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
1053      'OCEANICP', also initialised field pressure correctly in ini_eos in the
1054      case of pressure coordinates. eosType='JMD95Z' in
1055      combination with buoyancyRelation='OCEANICP' now causes an error.
1056    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1057      in find_alpha/beta.
1058    checkpoint46d_pre
1059    
1060    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1061      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
1062    
1063    checkpoint46c_post
1064    o Changes necessary for ocean in p-coordinates
1065     -  Added new buoyancy relation = 'OCEANICP'
1066     -  Added new parameters = gravitySign (this used to be contained inside
1067        the factor dRdZ which I added when we first switched to R coordinates).
1068     X GM/Redi is not compatible (yet)
1069     X bottom drag and no-slip need to be debugged.
1070    checkpoint46c_pre
1071    
1072    checkpoint46b_post
1073    o Added new equation of state -> JMD95Z and JMD95P
1074      - EOS of Jackett and McDougall, 1995, JAOT
1075      - moved all EOS parameters into EOS.h
1076      - new routines ini_eos.F, store_pressure.F
1077    o Added UNESCO EOS, but not recommended because it requires
1078      in-situ temperature (see JMD95)
1079    o Modified formatting for knudsen2.f in utils/knudsen2 and added
1080      unesco.f to be used with POLY3
1081    checkpoint46b_pre
1082    
1083    checkpoint46a_post
1084    o Added (atmospheric) pressure loading
1085      - new field in FFIELDS.h, etc...
1086      - new cpp flag ATMOSPHERIC_LOADING
1087    o Changed hFacC to _hFacC in calc_phi_hyd.F
1088    o Added SHORTWAVE_HEATING to some files for consistency
1089    checkpoint46a_pre
1090    
1091    checkpoint46
1092    further merges from release1_p5
1093    o new ctrl package
1094      - adopted from ECCO environment to enable optimization
1095      - added Eliassen Palm fluxes to controls
1096    o added Eliassen Palm flux controls to gradient check package
1097    o cost package
1098      - Compatible with new ctrl package
1099      - added Eliassen Palm cost hooks
1100      - modif's of existing cost functions
1101    o Adjoint-related bug fixes in kpp:
1102      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
1103      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
1104    o autodiff package
1105      - flow directives:
1106        + new for S/R do_the_model_io
1107        + enhanced for S/R checkpoint
1108        + new gmredi.flow
1109      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
1110        disable adcommon.h/g_common.h by default.
1111      - fixed problem for adjoint of global_max
1112    o modified verification/carbon/
1113    o New setup for adjoint of global_ocean
1114    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
1115    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
1116    o incorporated hooks for sponge layer code (external_forcing.F)
1117    
1118    checkpoint45d_post
1119    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
1120    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
1121      (affects plume_on_slope "cg2d" output)
1122    o add new parameter deltaTfreesurf for free-surface time stepping
1123    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
1124    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
1125    o change phiMin in exp1 (to agree with documentation)
1126    o add new flags:
1127     - T,S forcing inside/outside Adams-Bashforth
1128     - turn off temp,salt advection and/or forcing
1129     - for each tracer, define internal flag for multiDimAdvection & A-B
1130    o monitor: change definition of KE to check conservation of Energy
1131    
1132    checkpoint45c_post
1133    o Removed f90 comments ("!")
1134    o Modified initialisations to enable exf package for MITgcm
1135      (without invoking ECCO_PACKAGE).
1136    o modifications to gradient check package (Martin Losch)
1137      - enable centered differences
1138      - modified format of standard output
1139    
1140    checkpoint45b_post
1141    o cleaned exchange calls in cg2d
1142    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
1143    o included CPP option SINGLE_LAYER_MODE in thermodynamics
1144      to configure barotropic setup (Martin Losch)
1145    o moved some initialisations within bi,bj loop in dynamics
1146      (TAF flow dependency)
1147    o in initialise_varia, moved call packages_init_variables
1148      before convective_adjustment_init
1149      (corresponding adjustment of TAF tape initialisation).
1150    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
1151    
1152    checkpoint45a_post
1153    o compute Rho over the whole domain (extend iMin,jMin indices)
1154    o specific exchange for X-slice domain (case Ny=1)
1155    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
1156    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
1157    
1158    checkpoint44h_post = checkpoint45
1159    o Fix to restore differentiability:
1160      place at which packages_init_variables is called in
1161      initialise_varia is crucial for reverse control flow.
1162    o modifications in GMRedi to enable stable adjoint
1163      (corresponding modif's in thermodynamics, dynamics)
1164    o added missing hook for sponge layer code in external_forcing
1165    o modified test cost functions
1166    o storing in gad_advection (plus removal of write(0,*)!
1167    o missing headers TR1.h added in convective_adjustment routines
1168    o errorMessageUnit set non-equal zero in eeboot
1169      (conflict on some platforms, e.g. IBM SP3)
1170    o modified carbon verif.
1171    
1172    checkpoint44h_pre
1173    o vertical grid option: allow to put the Interface at the middle between
1174      2 cell-centers ; replace delZ in pkg/kpp by drF.
1175    o GM Advective form: Tracers are advected using the residual transport (=
1176      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
1177    
1178    checkpoint44g_post
1179    o fix surface correction term in multiDimAdvection (affects plume_on_slope
1180      results) ; ifdef missing in thermodynamics.F
1181    
1182    checkpoint44f_pre,checkpoint44f_post
1183    o added PTRACERS package
1184      This allows an arbitrary number of passive tracers to be integrated
1185      forward simultaneously with the dynamicaly model.
1186      + Implemented so far:
1187        - basic forward algorithm (time-stepping, advection, diffusion, convection)
1188        - I/O and checkpointing
1189        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
1190      + Not implemented so far:
1191        - KPP
1192        - OBCS
1193      + No specific example supplied (yet) but global_ocean.90x40x15 has the
1194        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
1195        line in data.pkg.
1196      + This package is disabled by default since it increases storage.
1197    
1198    
1199    o testscript: added -cleanup option
1200    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
1201                 b) enable to filter 2D fields.
1202    
1203    checkpoint44e_pre,post
1204    o re-wrote convective adjustment to use pre-calculated weights
1205      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
1206      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
1207      Original calls to convect() still in place.
1208    
1209    chkpt44d_pre,post
1210    o added missing EXCLUDE_MONITOR flags
1211    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
1212      (incompatible typ in MIN/MAX expressions caused problems
1213      on IBM SP3)
1214    o in genmake added variable MAKEDEPEND
1215      plus resetting for case SunOS
1216    o added timer_stats.c routine for IBM SP3
1217    o removed variables in dynamics
1218    !!! I forgot to create tag chkpt44d_pre !!!
1219    !!! But chkpt44d_pre = chkpt44c_post    !!!
1220    
1221    o real fresh water flux implemented with non-linear free-surface.
1222    
1223    chkpt44c_pre,post
1224    o few fix (mask in shap_s2, EmPmR in external_field_load,
1225      USE_NATURAL_BCS in solve_for_P);
1226    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
1227    
1228    checkpoint44b_pre/_post
1229    o merge of relevant stuff from the ecco-branch:
1230      - genmake: removed $S64 overwrite for case SunOS
1231      - pkg/exf: update and corrections for field swapping and obcs
1232      - pkg/ecco: parameter lists for the_model_main, the_main_loop
1233                  harmonized between ECCO and MITgcm
1234      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
1235                      updated checkpointing_lev... lists for obcs
1236      - model/src: minor changes in forward_step, plot_field
1237                   added directive for divided adjoint in the_main_loop
1238      - pkg/mdsio: added mdsio_gl_slice
1239    
1240    o check parameters & config (chkpt44a_pre,post)
1241    o OBC and NonLin_FrSurf.
1242    
1243    checkpoint44
1244    o fix bug in mom_vi_del2uv
1245    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
1246    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
1247    o update AIM experiments (NCEP input files)
1248    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
1249    o added some stuff for AD
1250    
1251    checkpoint43
1252    o added two new advection tests
1253    o added global 4x4 degree ocean test
1254    o added test of H&S94 with free surface on cube
1255    o some final mods for gradient check, adjoint,...
1256    
1257    checkpoint42
1258      Fixed AD-related problems:
1259    o Store directives up-to-date with re-arranged Adams-Bashforth
1260      (mainly thermodynamics.F)
1261    o New store directives for multi-dim. advection schemes
1262      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
1263      * new common block and key passkey
1264      (mainly gad_advection.F)
1265    o Modified store directives for split of dynamics/thermodynamics
1266      for the case ALLOW_KPP
1267    o Cleaned argument list for timestep_tracer.F
1268    
1269    checkpoint41
1270    o re-formatted/added comments in prologues of key subroutines
1271      to work with protex
1272    
1273    checkpoint40
1274    o moved calc_gs, calc_gt and calc_tr1 back to model/src
1275    o added FLT (floats) package from Arne along with demo. experiment
1276    o re-arranged Adams-Bashforth scheme for tracers to allow easier
1277      implementation of forward-in-time forcing terms
1278    o more mods for non-linear free-surface including new variable
1279    o modified multi-dim method to work on cube
1280    o bug fix in KPP (from DM)
1281    
1282    checkpoint40pre9
1283    o added DST advection schemes
1284    o fix MPI bug on SGI's
1285    o modifications for non-linear free-surface
1286    o fixed conditionals for fixed flow/passive tracer only mode
1287    o added tension/strain form of stress tensor
1288    o changes to commenting of arguments for TAF/TAMC
1289    o added/updated many matlab scripts
1290    o added multi-dimensional advection method for tracers
1291      
1292    checkpoint40pre8
1293    o new package rw/
1294      Added method for dumping intermediate local arrays:
1295      mdsio_writetile - same as mdsio_writefield except works from inside
1296                        bi,bj loop
1297      mdsio_writelocal - same as mdsio_writetile except works for local
1298                         arrays
1299      write_local_r? - higher-level wrapper for mdsio_writelocal
1300      Controlled by diagFreq. Defaults to zero (ie. no dumps)
1301      Example given at end of mom_vecinv.F that dumps some local arrays.
1302    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
1303      control flux-form versus vector invariant code.
1304      Switch is runtime flag vectorInvariantMomentum (defaults to false)
1305      or genmake -DISABLE ...
1306    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
1307      (additional storing is now needed for case vecinv;
1308      currently nothing implemented to switch this storing off
1309      in case fluxform is used since no CPP flag available).
1310    
1311    checkpoint40pre7
1312    o bug fix in dynamics.F
1313      calc_viscosity called before k=1,Nr loop.
1314    o added some #ifdef's ALLOW_PASSIVE_TRACER
1315    o cleaned initialisations in ctrl_map_ini
1316      related to TAF
1317    
1318    checkpoint40pre6
1319    o split dynamics into thermodynamics & dynamics
1320    o corresponding split of calc_diffusivity into
1321      calc_diffusivity, calc_viscosity
1322      (kpp_calc_diff, kpp_calc_visc).
1323    o Added diffkr, kapgm to control variables
1324    o bug fix in gmredi_slope_limit for ldd97
1325    
1326    checkpoint40pre5
1327    o proper initialization of Adams-Bashforth time stepping
1328      + uses forward step for very first step of model (iter=0)
1329    o re-generated *all* output since almost all output is modified by this
1330      change (sorry but we've been putting this one off for about 2 years)
1331      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
1332        *not* regenerated since they are already out of date and I don't
1333        want to create the impression that they are suddenly working.
1334    o removed KAP stuff for DEC's
1335    o modified/added many .cvsignore files in */code and */input
1336    o added new expt "solid-body.cs-32x32x1"
1337      + this uses an alternative form of ini_curvilinear_grid.F which
1338        is not necessarily any better than the current one...
1339    
1340    checkpoint40pre4
1341    o added re-initialisations of utrans,vtrans,rtrans in
1342      calc_common_factors which are crucial for TAF.
1343    o extended iMin,jMin range for calc_common_factors,
1344      calc_diffusivity
1345    o added option ALLOW_PASSIVE_TRACER
1346    o a few minor updates and fixes
1347    
1348    checkpoint40pre3
1349    o created calc_gtr1.F for gad package
1350    o split the_main_loop and re-introduced forward_step
1351    o some recomputations of nIter0 for TAMC
1352    
1353    checkpoint40pre2
1354    o Updated to latest branch of AJA, JMC
1355    o Added gradient check package
1356    o Added routines for passive tracer handling
1357    o Added carbon sequestration sensitivity experiment
1358    
1359    checkpoint39
1360     o Modifications and fixes to support TAMC
1361       (mainly missing or wrong directives)
1362     o Corrected common blocks when fooling TAMC to produce adjoint I/O
1363       in addummy_in_stepping
1364     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
1365     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
1366     o Included following packages:
1367       cal: calendar
1368       exf: external forcing
1369       ecco: essential routines to control use of cal, exf
1370             (NB: this is not the full ECCO environment)
1371     o disabled some packages by default in genmake
1372    
1373    checkpoint38
1374     o see notes_c37_adj.txt
1375     o corrected wrong layer index in external_forcing_t
1376     o replaced the_main_loop/forward_step by the_main_loop
1377     o removed forceoutput from write_state
1378       (replaced criteria for initial/final state)
1379     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
1380    
1381    checkpoint37
1382     o mdsio.F routine split and packaged in pkg/mdsio
1383       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
1384        used unless genmake -disable=mdsio)
1385     o allow a more precise surface-geopotential gradient for the atmosphere
1386       taking into account the change in space of Alpha (=1/rho) at the surface.
1387     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
1388       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
1389     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
1390       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
1391       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
1392     o Time-Average diagnostics defined as a pseudo package "timeave".
1393     o pickup files : old pickup (before c35) did not work with new code (c35
1394       and after) unless activating 2 commented lines in initialise-varia.
1395     o Non-Hydrostatic pickup file Pb fixed.
1396     o bug with Rigid-lid version (since c35) fixed.  
1397    
1398    checkpoint36
1399     o implement Crank-Nickelson barotropic time-stepping
1400     o recover Time-Average diagnostics
1401     o fix Pb in checkpoint (PR#19)
1402     o AIM become a standard package ; clean unused CPP_kees
1403    
1404    checkpoint35
1405     o subtantial rewrite of dynamics.f
1406     o allows staggered time-stepping
1407     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
1408     o added bottom drag (linear + quadratic)
1409    
1410    checkpoint34
1411     o Modified exchange routines for correct reverse simulation.
1412     o Added verification output to comply with bug fix in impldiff.F
1413       as of c33 (exp2, natl_box).
1414     o Corrected store directives in dynamics.F
1415     o Corrected array boundaries in impldiff.F
1416     o Corrected array dimensions in gmredi.
1417       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
1418     o Added routine GLOBAL_SUM_INT to global_sum.F
1419     o Added mdsio_gl.F for ECCO purposes.
1420    
1421    checkpoint33
1422     o Fixed bug in lower BC in impldiff.F
1423     o Fixed confusion about units of forcing arrays in FFIELDS.h
1424       namely Fu,Fv,Qnet,Qsw,EmPmR:
1425       - Removed verification/natl_box/code/external_fields_scale.F
1426         (did not differ from that in model/src)
1427       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
1428         (see FFIELDS.h for description)
1429       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
1430         kpp_calc.F and kpp_transport_t.F
1431       - Removed model/src/external_fields_scale.F and calls to it
1432       - verification/natl_box uses flux data with "atmospheric" sign so
1433         a special version of external_fields_load.F is used to
1434         change the data as it's read in. This way, the arrays
1435         have the right units and signs at all times tha a user could
1436         possibly use them.
1437     o Corrected genmake to delete a temporary file during configuration
1438    
1439    checkpoint32
1440     o Scaling of forcing fields moved from external_forcing.F to
1441       external_fields_scale.F, called directly after loading fields.
1442     o Surface relaxation terms added to surface tendency fields in
1443       extra subroutine.
1444     o impldiff.F changed to avoid storing by TAMC of huge intermediate
1445       fields.
1446     o Changes in GMRedi to comply with packaging structure.
1447     o Modifications and bug fixes in KPP package.
1448     o Verification experiment for KPP added (verification/nat_box/)
1449    
1450    checkpoint31
1451     o Packages interface brought in line with defined standard
1452       -> new routines packages_...F
1453       -> changes in initialise_fixed.F, initialise_varia.F
1454       -> enables initialisation interface for ECCO package
1455     o Rescaling of external forcing fields immediately after read
1456       (removed from external_forcing.F)
1457       -> new: surface_fields_scale.F
1458       -> affects ini_foorcing.F, external_fields_load.F
1459     o Computation of surface tendencies before tendency updates.
1460       -> new: external_forcing_surf.F
1461     o Change of variable names useGMRedi, useKPP, useECCO
1462     o Further changes in dynamics.F, impldiff.F for TAMC
1463     o Tested for experiments 0, 2, 4.
1464       - not yet tested for GMRedi.
1465       - not yet tested for KPP.
1466    
1467    checkpoint30
1468     o Updates for OBCs
1469     o New experiment for test OBCs (internal_wave)
1470     o New output.txt in verification/exp4/results/
1471     o Updates for KPP: calculation of viscosity corrected, new variables
1472       kpp_dumpFreq and kpp_taveFreq
1473     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
1474       and entry for T90 in genmake
1475    
1476    checkpoint29
1477     o packaged KPP and GM/Redi
1478    
1479    checkpoint28
1480     o Corrected initialization of hFacMin for difference vertical coordinates
1481     o Modified calculation of partial cell thickness to more robust algorithm
1482     o config_summary.F: replaced write_1D_... by write_0D_...
1483       read_write.F: added subroutines write_0D_...
1484     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
1485       included some initialisations required for TAMC.
1486     o routine calc_isoslopes: modified sqrt computation to make it
1487       differentiable for zero argument.
1488     o routines dynamics, impldiff:
1489       included store directives and tape key computations required for TAMC.
1490     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
1491    
1492    checkpoint27
1493     o fixed calc_isoslopes() to so that cancellation of terms in tensor
1494       formulation works properly with variable resolution.
1495     o restructured the calling tree between the_model_main() and dynamics()
1496     o split initialise() into initialise_fixed() and initialise_varia()
1497     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
1498       in new routine ini_psurf()
1499    
1500    checkpoint26
1501     o moved some #ifdef in optional routines to encompass everything
1502       except the argument declarations. This was using up some memory.
1503     o fixed macros like _ADT to work with both versions of Linux cpp
1504     o cleaned up some unused and uninitialized variables
1505       (helps when debugging with strict compile options)
1506     o split up CPP_EEOPTIONS.h into options and macros
1507       (macros are now in eesupp/inc/CPP_EEMACROS.h)
1508     o patch for 2 processor JAM mode
1509    
1510    checkpoint25
1511     o updates for OBCs and NH
1512     o dramatically reduced memory usage
1513     o added "JAM" routines for use on Artic network
1514     o parameterization of convection by implicit vertical diffusion
1515     o added a diagnostic of convective index
1516     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
1517       (this is was partly for OBCs and NH but also in anticipation of
1518        an explicit free-surface option)
1519     o initial state input files for U and V
1520    
1521    checkpoint24
1522     o Removed some spurious "REAL"s
1523     o Updated KPP to latest version from JPL
1524     o Added a COS(latitude) in horizontal viscosity
1525    
1526    checkpoint23
1527     o Added del^4 diffusion for salt and temperature
1528     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
1529    
1530    checkpoint22
1531     o Made many small changes: implicit none, format(i5), etc...
1532     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
1533    
1534    checkpoint21
1535     o Introduced new I/O package that supports direct-access records (mdsio.F)
1536     o Split-up mid-level I/O routines
1537     o Updated input data for experiments 0,1,2,4 and 5
1538     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
1539    
1540    checkpoint20
1541     o Tidied up open-boundaries some more
1542     o Added non-hydrostatic code
1543     o Fixed some input data
1544     o Modified MPI start-up to work in "coupled" context.
1545    
1546    checkpoint19
1547     o Tidied up directory structure for verification experiments.
1548     o Added new code for open boundaries.
1549     o Corrected advective terms near boundaries.
1550     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
1551     o Implemented free-slip/no-slip BCs and del^4 dissipation.
1552     o Split default parameters out of ini_parms.F into set_defaults.F.
1553    
1554    checkpoint18
1555     o Further changes for optional code generation with
1556       CPP - ugh!
1557    
1558    checkpoint17
1559     o Beginning to incorporating modularity
1560       for supporting atmos. and ocean configs.
1561     o Small changes for TAMC complinace
1562     o New ultra simple test case. Barotropic box
1563       configuration "exp0".
1564    
1565    checkpoint16
1566     o Minor changes to exchange routines to support
1567       accumulation in reverse mode. Adjoint of an
1568       assignment is an addition.
1569     o Changes to support compilation by TAMC (LR(1)
1570       syntax) and by g77 under Linux ( 72 character
1571       limit ).
1572    
1573    checkpoint15
1574     Rewrote exchange routines to allow
1575     o General tile <-> tile connectivity.
1576     o TAMC reverse mode flag ( is this really needed? )
1577     o Variable width overlap and exchange region widths.
1578     o Hooks for sharing data via DMA, Arctic, Memory Channel,
1579       shmput/shmget, VIA, SYSV shmem and every other cool
1580       communication method.
1581    
1582    checkpoint14
1583     Consistent isomorphism chages made. These allow dynamical core
1584     to support both pressure and meters as a vertical coordinate.
1585    
1586    checkpoint13
1587     Release which corrects global_max problem and a couple
1588     of KGM time-averaging diagnostic errors. Also contains
1589     a double-gyre experiment setup as well as the baseline
1590     4 degree global template. The double gyre template is
1591     organised to allow it to be applied automatically to
1592     the baseline configuration.
1593    
1594    branch-point-rdot
1595     A few tidy-ups have been made bt the real point of this
1596     check-point (excuse the pun) is to allow a branch to be
1597     made for the purposes of adding the rDot alterations.
1598     I don't want to commit the rDot to the main-trunk until
1599     we've actually tested it...
1600    
1601    checkpoint12
1602     Tidy up and added generic genmake script (formerly
1603     configure script).
1604     Released to testers.
1605    
1606    checkpoint11
1607     Re-arranged initialise() and introduced ini_vertical_grid()
1608     and ini_masks_etc().
1609    
1610    checkpoint10
1611     Introduced the configure script.
1612     Separated out the diags package.
1613     Added template for writing time-averages of tile/intermediate quantities.
1614     Updated SIZE.h in exp2 and made the data big-endian.
1615    
1616    checkpoint9
1617     MPI fix. Filename changes (meta/data). salbin*y stuff.
1618     General tidy-up.
1619     SST.bin SSS.bin added to verification/exp2
1620    
1621    checkpoint8
1622     Inludes time-dependant forcing and time-averaging.
1623     Works at 4x4 and 2.8125x2.8125 global
1624    
1625    checkpoint7-4degree-ref
1626     Branch from checkpoint7. Released for application to
1627     global modeling and general modeling - process studies, regional
1628     model etc..
1629     Configured for verification/exp2 - 4 degree global, two process.
1630    
1631    checkpoint7
1632     Created by cnh
1633     Simple 4 degree global simulation
1634     configuration.
1635     Includes climatological wind,
1636     hydrography, bathymetry etc
1637     Does not include Heat Flux and E-P
1638    
1639  checkpoint6  checkpoint6
1640   Created by cnh   Created by cnh
1641   merged checkpoint5 with CD and   merged checkpoint5 with CD and

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