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revision 1.14 by cnh, Tue Sep 29 18:57:53 1998 UTC revision 1.261 by heimbach, Thu Feb 26 19:36:38 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 mask vorticity at the corner ; affects global_ocean.cs output
7    o fix ini_curvilinear_grid ; test CS experiments with mpi
8    o aim.5l_cs: modify sea-ice fraction input file ; update output
9    o exf: Adding simple range check routine for exf fields after read
10    
11    checkpoint52k_post
12    o removed top-level directory "diags"
13      - we migrated these functions to pkg/timeave a long time ago
14    o fixed bug introduced in pkg/monitor
15    o accuracy ctrlprec = 32 insuffient for gradient checks using
16      averaged fields (I/O via cost_averages)
17      -> use ctrl.h in active_file*.F to control I/O precision.
18    o paramter list of CALL ADTHE_MAIN_LOOP
19    o added initial do_the_model_io to ecco
20    o set all ...Freq to zero after cost_final
21      taveFreq, dumpFreq, pChkptFreq
22    o MAIN and ECCO differentiability restored
23    
24    checkpoint52j_post
25    o fix nchklev in tamc.h for global_ocean...
26    o Bringing flow and store directives up-to-date
27    o Really weird thing!
28      call do_the_model_io from the_main_loop with parameters
29      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
30      TAF places a faulty re-call of initialise_varia
31      after cost_final call which should not be there!
32    checkpoint52j_pre
33    
34    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
35      error messages
36    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
37    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
38      debug output
39    o modfied mdsio_writefield.F to handle non-global files under exch2
40    o update AIM Cubed-Sphere exp (aim.5l_cs):
41      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
42    o update AIM Equatorial Channel exp:
43      use standard aim_v23 pkg and change the SST fields to be more realistic.
44    o globalFile now works with exch2
45    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
46      mon_vort3.F to make exch2 friendly with >1 tile per cube face
47    o limit timeave output for hi-res integrations
48    
49    checkpoint52i_post
50    o removed CPP_EEOPTIONS.h from verification/*/code
51    o updated the tiling for global_ocean_pressure
52    checkpoint52i_pre
53    
54    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
55      the old pkg/aim).
56    
57    checkpoint52h_pre
58    o shortened offending lines in exch2_send_rx?.template
59    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
60    o genmake2: add build & execute test for NetCDF code
61    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
62      old grid files, moved CPP_EEMACROS.h to pkg/exch2
63    o added useSingleCPUIO flag to monitor.F and mon_out.F
64    o added temporary hack for sea-ice dynamics on the cube:
65      metric terms are ignored and it is assumed that
66      there is no sea-ice on cube faces 1, 2, 4, and 5.
67    
68    checkpoint52f_post
69    o added exch2 cube routines to pkg/exch2
70    o modified hs94.cs-32x32x5 to use it
71    o added new grid files to hs94.cs-32x32x5
72    checkpoint52f_pre
73    
74    checkpoint52e_post
75    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
76      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
77    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
78      to work with implicit vertical advection and AB ;
79    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
80    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
81     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
82    checkpoint52e_pre
83    
84    o fix bug in impldiff when Nr=1 or Nr=2.
85    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
86    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
87    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
88      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
89    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
90    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
91    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
92    
93    checkpoint52d_post
94    o re-tiled many expts to allow comparison in multi-processor mode
95      - updated output accordingly
96      - changed hs94.128x64x5 to use intial T from file rather than use the
97        random number generator
98    o add infrastructure in model routines for fizhi and gridalt packages
99    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
100    o changes to permit hi-res, cubed-sphere, configuration
101      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
102      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
103      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
104        of surface winds for the cube
105      (A verification experiment, based on global_ocean.cs32x15, but with
106       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
107       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
108       complete with example surface forcing files and matlab scripts to look
109       at the output and compare it with that of global_ocean.cs32x15.)
110    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
111       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
112       to conform to the common rule.
113    o check-in the first version of the coupler + interfaces for multi-components
114       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
115       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
116       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
117       - ocean and atmos. share the same horizontal grid (no interpolation).
118       - exchanges between component and coupler is done in forward_step
119    o new verification experiment, cpl_aim+ocn:
120       coupled ocean - AIM atmosphere on cs32 grid.
121    
122    checkpoint52d_pre
123    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
124    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
125    
126    checkpoint52c_post
127    o Fixing OPTIONS files for use of exf:
128      - ALLOW_ECCO not needed
129      - ECCO_CPPOPTIONS.h should not be included from
130        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
131        as has been the case in the past
132      - All cal/exf related options are currently set in
133        single header file. Should remain so until we
134        agree on a consistent new policy.
135    o Removed all CPP options for cal package.
136      cal has no more CPP options.
137    o modified STOREs in GAD_ADVECTION
138    o corrected key comp. for passkey
139    
140    checkpoint52b_post
141    o new version: "thsice" of thermodynamic sea-ice pkg:
142     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
143     - modify fluxes but do not change theta directly;
144     - light cleaning of bulk_force pkg (still needed with thsice).
145     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
146       + output_thsice.txt to test thsice & bulk_force pkgs.
147    o put back grid & coriolis monitor output.
148    checkpoint52b_pre
149    
150    o call "do_the_model_io" at the beginning (=> dump initial state)
151    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
152    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
153      (need info on NUMBER_OF_PTRACERS)
154    o missing PTRACERS headers in some routines
155    o default tamc.h in pkg/autodiff supposed to crash
156      to ensure proper customization
157    
158    checkpoint52a_post
159    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
160      - moved surfaceTendencyTice from pkg/seaice to main code
161      - subroutine FREEZE_SURFACE now limits only surface temperature
162        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
163        => new output.txt for global_ocean.cs32x15 & global_with_exf
164      - keep the old version of FREEZE for backward compatibility;
165        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
166      - corresponding modifs for TAF directives
167    o added surface flux output variables to TIMEAVE_STATVARS
168    o time-averaged output for pkg/ptracers
169    o fix problem with ECCO-related divided adjoint
170      snapshot file was missing some ad-variables,
171      but no warning issued by TAF
172    
173    checkpoint52a_pre
174    o some bug fixes for #undef REAL4_IS_SLOW
175    
176    checkpoint52 = ecco_c52_e35
177    o after testing adjoints of checkpoint51u_post
178    
179    checkpoint51u_post
180    o this is the post-merge tag of the ecco-branch
181      (needs another clean checkout and re-testing)
182    o various natl_box_adjoint configs and results
183      but no input fields
184    o obcs adjoint not yet merged!
185    o adding ECCO global 1x1 and 2x2 degree configs
186    o updated/extended some store directives for seaice
187    o pkg/ecco now containes ecco-specific part of cost function
188    o top level routines the_main_loop, forward_step
189      supersede those in model/src/
190      previous input data.cost now in data.ecco
191      (new namelist ecco_cost_nml)
192    o in ctrl/ cleaned some cross-dependencies and updated CPP options
193    
194    checkpoint51t_post
195    o this is the pre-merge tag of the ecco-branch
196    
197    checkpoint51s_post
198    o cleanup: removed various obsolete #define-s
199    o pkg/grdchk
200      - renamed 'ph-grd 3' to 'grad-res'
201      - merged from ecco-branch
202        (remaining bug fixes for obcs gradient checks)
203      - additional high-precision output for testreport
204        (grep for 'precision_grdchk_result')
205    
206    checkpoint51r_post
207    o cleaned up or removed CPP_OPTIONS.h files
208    o updated results for some of the tests to reflect the new
209      optfiles (-ieee: -O0 instead of -O3)
210    
211    checkpoint51q_post
212    o cd_code:
213      - moved cd_scheme.F -> cd_code_scheme.F
214      - separate read_checkpoint from cd_code_ini_vars.F
215      - separated cd_code part from write_checkpoint
216      - updated AD_SOURCE, generated .flow
217      - added CD_CODE_VARS.h to the_main_loop
218      - Moving cd_code specific store dir.s to pkg/cd_code
219    o ctrl package totally restructured
220      - pack/unpack now optional and decoupled from
221        xx_/adxx_ I/O
222      - ctrl_pack/unpack cleaned
223        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
224      - confined inclusion of AD_CONFIG.h to where necessary.
225    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
226    
227    checkpoint51p_post
228    o create initial cd_code package
229      - WARNING: the initialization of fields within packages
230        is broken because INI_FIELDS (where READ_CHECKPOINT is
231        called) is called *before* PACKAGES_INIT_VARIABLES.
232        This seems to be backwards since
233        1) its important to initially zero the entire field including
234           the "halo" region
235        2) zeroing needs to be done *before* reading pickup info
236           and the pickup call might or might not happen in any
237           particular run
238      - this needs an overhaul for R2
239    o cleanup verification/*/code/GMREDI_OPTIONS.h
240    o cleanup testreport
241    
242    checkpoint51o_post
243    o bringing AD-related verif's up to date with genmake2
244      - carbon/
245      - global_ocean.90x40x15/
246      - hs.94.1x64x5/
247      - (front_relax/ )
248    o (more) consistent directory structure for AD-related verif.'s
249    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
250    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
251    o bug fix in find_alpha.F for MDJWF:
252      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
253        change rho -> rho-rhoConst
254      - replace call find_rho to find_rhonum
255    o initialisation of rFlx extended to full array (required by TAF)
256      and shifted to thermodynamics
257    o removed PTRACERS.h in ptracers routine
258    o added surfacetendencyPtr to S/R parameter list pracers_forcing
259    o Correcting initialisations for fVerU, fVerV.
260    o helping TAF to recognize dependency on kUp for
261      fVerU, fVerV
262    o Replacing delZ by delR in pkg/ctrl/
263    checkpoint51o_pre
264    
265    o undid all of cp51 pending some cleanups and discussion
266    o added the [#include "AD_CONFIG.h"] statement to all files that need
267       it for adjoint/tl #defines
268     o re-worked the build logic in genmake2 to support AD_CONFIG.h
269     o removed tools/genmake since it no longer works
270    
271    checkpoint51n_post
272    o modifications to make FREEZE flux visible to pkg/kpp
273      - moved surfaceTendencyTice from pkg/seaice to main code
274      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
275      - subroutine FREEZE now limits only surface temperature
276        (this means new output.txt for global_ocean.90x40x15,
277         global_ocean.cs32x15, and global_with_exf)
278    o added surface flux output variables to TIMEAVE_STATVARS
279    
280    checkpoint51n_pre
281    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
282    o added [#include "AD_CONFIG.h"] to all files that use the following
283      defines:
284      - ALLOW_ADJOINT_RUN
285      - ALLOW_TANGENTLINEAR_RUN
286      - ALLOW_ECCO_OPTIMIZATION
287    
288    checkpoint51m_post
289    o incorporating changes to get TAMC/TAF working in genmake2
290      - added new TAMC/TAF targets to the Makefile
291      - various cleanups related to package handling
292      - these changes should have no impact on the forward model
293    
294    checkpoint51l_post
295    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
296     - faster algorithm for cal_addtime.F
297     - higher precision arithmetic, where needed
298     - pkg/exf *startdate variables changed from calendar date to
299       model integration time
300    
301    checkpoint51l_pre
302    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
303    o enable to apply restoring on S & T only in a latitude band.
304    o update output (external_forcing_surf modif. change truncation errors)
305       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
306    
307    checkpoint51k_post
308    o change default to: useNHMTerms=.FALSE.
309     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
310       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
311     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
312        exp1, ideal_2D_oce
313     - change data file of oceanic exp (leave the results unchanged for now)
314       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
315    o set gravitySign automatically according to the vertical coordinate used
316      (and change sign: back to "logical" value: +1 when R increases downward)
317    o added an include barrier to the default CPP_OPTIONS.h and
318      removed the #include "PACKAGES_CONFIG.h" from it
319    o fix a bug in mom_fluxform (from chk51j_post)
320    
321    checkpoint51j_post
322    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
323    o adjusted some flow directives (dynamics, thermodynamics)
324    o added cubed-sphere case to test cost function
325    o heckpoint_lev?_directives.h now include
326      pkg-specific directives, whenever those are enabled.
327    o Moving pkg-specific flow directives to corresponding pkg
328      Moving pkg-specific differentiation list to corresponding pkg
329      Moving pkg-specific checkpoint-lev storing to corresponding pkg
330      ---> conventions are
331           - pkg_ad.flow
332           - pkg_ad_diff.list
333           - pkg_ad_check_lev?_dir.h
334    
335    checkpoint51i_post
336    o merge of the branch-genmake2
337      - knowingly breaks the older genmake
338      - automatic generation of all ALLOW_${PKG_NAME} defines
339      - new testreport supersedes older testscript
340    o large number of package inclusion and header cleanups
341    checkpoint51i_pre
342    
343    o new output for adjoin of global ocean vector invariant
344    o fix for checkpoint of thermodynamic seaice and bulk_force
345    o Steph gchem various cleanups
346    
347    checkpoint 51h_pre
348    o fixed some single quotes
349    o modify gchem pkg to be more versatile
350    o modifications to clean up dic pkg
351    o add pkg/cfc
352    
353    checkpoint51g_post
354    o provide links for ARPACK and ADM*TLM
355    o start removing verification/vero/
356    o update AD-related stuff
357      (in particular some IF-statements in model/src/ routines)
358    o adding to verification/global_ocean.90x40x15/ adjoint of
359      vector invariant setup
360    
361    checkpoint51f_post
362    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
363    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
364      of tracer Green's fucntions for ocean inversion project.
365    
366    checkpoint51f_pre
367    o Added on-the-fly spatial interpolation capability
368        "USE_EXF_INTERPOLATION" to pkg/exf.
369      - This is a temporary Cartesian-grid hack until
370        the super-duper ESMF coupler becomes available.
371      - See verification/global_with_exf/README for usage example.
372      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
373        flags and modified pkg/seaice accordingly.
374    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
375        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
376        non-local transport term.
377    
378    checkpoint51e_post
379    o pkg/mom_vecinv:
380      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
381      - add time-ave diagnostic of vorticity advection.
382    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
383    o atmospheric geopotential: - include water vapor effect;
384                                - use p^kappa in p* scaling.
385    o land pkg: read initial state from files.
386    o AIM : add stratospheric drag in the upper level
387    
388    checkpoint51d_post
389    o change function ILNBLNK (=> last non-blank char.) to return zero
390      (instead of the string length) when the string. char is empty
391    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
392    o modif's to restore TAMC compatibility
393      - avoid "_d" constructs in PARAMETER declarations
394      - avoid interrupting lines by comment lines
395    o Use cluster local disks for purely local I/O
396      vs. globally visible disks needed for ctrl stuff
397      (merged from ecco-branch)
398      - new active_file_loc... and mdsio_..._loc routines
399      - affected packages: autodiff, ctrl, grdchk, mdsio
400    
401    checkpoint51c_post
402    o introducing integer flag debugLevel
403      - debLevZero: suppress all output
404      - debLevA: standard
405      - debLevB: equivalent to current debugMode=.TRUE.
406    o introducing pathname variable mdsioLocalDir for mdsio
407      that can be specified at runtime
408      (relevant for cluster I/O to local disk)
409    `
410    >>>checkpoint51b_post
411    adjoint of ptracers
412    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
413    o extended state in checkpoint_lev?, etc.
414    o alternative ctrl/cost with tr1 or ptracer
415    o new comlev1_bibj_ptracers
416    o new ptracers.flow
417    o made ptracers_forcing same as external_forcing_s
418    o added verification for adjoint with ptracers
419      - adm. grdchk fail so far
420      - tlm. grdchk OK
421      - checked tapelev/comlev recomputations: OK
422    <<<checkpoint51b_pre
423    
424    checkpoint51a_post
425    o added code for biogeochemistry package
426      - new pkgs: dic, gchem
427      - new subroutine in ptracers
428    o modify code for biogeo packages
429      - in model/src and pkg/ptracers
430    
431    checkpoint51
432    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
433      - autodiff, ctrl, exf, grdchk, seaice
434      kept separate packages
435      - cost, ecco, obcs
436    o updating verification/internal_wave, verification/lab_sea
437      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
438    
439    checkpoint50i_post
440    o Preparing next differentiable checkpoint and sync
441      of MAIN vs. ecco-branch
442      - 1st step: this one is differentiable
443      - 2nd step: next(! not this) checkpoint will have updated packages
444                  from ecco-branch)
445    
446    checkpoint50h_post
447    o new package "land": provide surface BC for AIM.
448    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
449    o AIM: use true log-P extrapolation for near surface temp (= as in
450        F.Molteni paper) ; update aim.5l_cs output.
451    o New variable in PARM03 for more flexible pickups
452    o somewhat cleaned package initialisation sequence for
453      ctrl/ cost/ ecco/ in packages_... routines
454    
455    checkpoint50g_post
456    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
457      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
458      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
459        made the default because of faster convergence than ADI
460    
461    checkpoint50f_post
462    o exf totally restructured
463      - replaced all exf_set_ routines by one generic exf_set_gen.F
464        and made sure it's still differentiable
465      - split exf_getffields.F into new exf_bulkformulae.F
466      - exf_inscal_/exf_outscal_ suffixes consistent with field names
467      - updated adjoint/makefile and relevant verif. accordingly
468    
469    checkpoint50f_pre
470     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
471          + change Evap over land. (update aim.5l_cs output)
472     o added missing .cvsignores and made uniform across expts
473     o changed configuration of tidal_basin_2d expt
474     o added pkg/debug functions for tracing code in fatal crashes
475     o tidied pkg/monitor to use MONITOR_OPTIONS.h
476     o new fn in pkg/monitor to stop model if solution grows too big
477     o removed lots of single quotes from comments
478    
479    checkpoint50e_post
480    o make KPP work with PTRACERS
481     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
482       nearly a copy of kpp_transport_s
483     - there is no analogue to SurfaceTendencyS, so I have to use
484       gPtr(of the surface layer) instead
485    o add a new platform SunFire+mpi (SunFire 15000) to genmake
486    checkpoint50e_pre
487    
488    checkpoint50d_post
489    o change kpp output from multiple-record state files to single-record state
490      files analogous to write_state.F
491    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
492      analogous to the cg2d-related output.
493    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
494      so that writing to internal file fn (with length 512) fails.
495    checkpoint50d_pre
496    
497    checkpoint50c_post
498    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
499    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
500    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
501    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
502    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
503    
504    checkpoint50c_pre
505    Merging from release1_p13:
506    o bug fix for pkg/seaice dynamic solver
507    o Added SEAICE_initialHEFF to pkg/seaice
508    
509    checkpoint50b_post
510    o store u*,v* in gU,V instead of in guNm1,gvNm1
511    o in order to put the momForcing out of the Adams-Bashforth:
512      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
513      to timestep.F
514    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
515    o re-generate output for highly sensitive test-exp:
516       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
517    
518    checkpoint50b_pre
519    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
520    o corrected CPP option mismatch in exf_Bulk... functions for case
521      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
522    
523    checkpoint50a_post
524    o Bug fix for merging between c50 and KPP.
525      ikey was passed from thermodynamics to kpp_calc via
526      common block rather than being recomputed in kpp_calc,
527      in contradiction with new key itdkey.
528      New key ikppkey created, and tamc.h headers updated.
529    
530    checkpoint50
531    - 2nd step of merge with ecco-branch:
532      merge changes in ecco-branch back into main trunk
533    - bug fix in find_alpha
534    - more storing in gmredi_calc_tensor.F, kpp_routines.F
535    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
536    - merged some sliced AD support routines
537    
538    checkpoint49
539    merged from ecco-branch:
540    o exf:
541      - Enable initialisation of forcing fields to constant
542        (runtime) values.
543      - in exf_getffields.F
544        Reduce i-/j-loop to interior domain, discarding overlaps.
545        That also fixes wrong TAF-key computations for key_1, key_2
546        with bulf formulae.
547      - exf_init.F modify #ifdef for exf_init_evap
548      - exf_getffieldrec.F, ctrl_getrec.F
549        The following INT-usages are not safe:
550          fldsecs  = int(fldsecs/fldperiod)*fldperiod
551          fldcount = int(fldsecs/fldperiod) + 1
552        and were modified.
553    o autodiff: checkpoint_lev...
554      - updated storing for bulk formulae (some arrays were missing)
555      - added state for seaice package
556      - synchronized with main branch
557    o DIVA:
558      Modif.s in
559      - the_main_loop.F
560      - the_model_main.F
561      and added cost_final_restore.F cost_final_store.F
562      o With these changes, it is possible to fully separate
563        the first forward run to compute the cost function (mdthe_main_loop)
564        and adjoint runs over individual DIVA intervals (adthe_main_loop)
565        into separate model executions.
566        This enables better tuning of DIVA to given queue sizes.
567      o Loss of cost function value in consecutive DIVA runs is
568        fixed by storing to 'costfinal' file.
569      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
570        beginning/end of adjoint integration is accounted for.
571      The current changes apply to TAF-1.4.26.
572      TAF has one remaining bug, requiring one manual change
573      (see MITgcm manual).
574    o cal: synchronized between MAIN and ecco-branch
575    
576    checkpoint48i_post
577    o Changes to restore differentiability of code w.r.t. previous tag
578      (mostly adding new routines to make list and replacing
579      pressure by totPhiHyd).
580    o Updated and merged grdchk package
581      - has both ADM and TLM checks
582      - works for single- and multi-proc.
583      - output cleaned
584      - worked successfully for parallel DIVA
585    o genmake:
586      - Adding -platform=SP4
587      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
588    o Modif. for DIVA:
589      ctrl_unpack should not be called in intermediate DIVA interval.
590      (similar thing would apply for active files such as
591      tbar, sbar, psbar, which should not be reinitialised;
592      only relevant for ecco-branch)
593    
594    checkpoint48h_post
595    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
596    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
597    o Added SEAICE_initialHEFF to pkg/seaice
598    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
599    
600    checkpoint48g_post
601    --- EOS:
602    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
603      store total Potential in totPhyHyd for diagnostics & EOS.
604    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
605    --- Pressure/geopotential gradient:
606    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
607    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
608      ( changes results of global_ocean_pressure )
609    o NLFS + z-coord.: add eta*Rho' contribution.
610    o accurate phiHyd when using interface-W at the middle between 2 centers
611     ( changes results of ideal_2D_oce )
612    o includes r* 2nd term in potential gradient.
613    
614    checkpoint48f_post
615    Merging from release1_p12:
616    o Modifications for using pkg/exf with pkg/seaice
617      - improved description of the various forcing configurations
618      - added basic radiation bulk formulae to pkg/exf
619      - units/sign fix for evap computation in exf_getffields.F
620      - updated verification/global_with_exf/results/output.txt
621    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
622      (SBO) core products, including oceanic mass, center-of-mass,
623      angular, and bottom pressure (see pkg/sbo/README.sbo).
624    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
625      to avoid negative values in shallow regions.
626      - updated verification/natl_box/results/output.txt
627      - updated verification/lab_sea/results/output.txt
628    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
629    o Added useSingleCpuIO option (see PARAMS.h).
630    o Updated useSingleCpuIO option in mdsio_writefield.F to
631      work with multi-field files, e.g., for single-file pickup.
632    o pkg/seaice:
633      - bug fix in growth.F: QNET for no shortwave case
634      - added HeffFile for specifying initial sea-ice thickness
635      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
636    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
637      kpp_transport_t.F, forward_step.F, and the_main_loop.F
638    o pkg/seaice:
639      - adjoint-friendly modifications
640      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
641    
642    checkpoint48e_post
643    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
644    o dynamics: change definition of computational domain & adapt mom_fluxform
645      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
646    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
647        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
648        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
649        global_ocean.90x40x15 global_with_exf global_ocean_pressure
650        inverted_barometer solid-body.cs-32x32x1
651      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
652    
653    checkpoint48d_post
654    o in preparation for r*:
655     a) use pre-computed gradient of hydrostatic potential:
656        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
657     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
658        => affects results of glob_oce_pressure (different truncation error)  
659      update output.txt of ideal_2D_oce & global_ocean_pressure
660    
661    checkpoint48d_pre
662    o in preparation for r*:
663      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
664      pass the 2 comp. of the grad. as arguments to momentum S/R.
665      but for the moment, only used if it does not change the results.
666    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
667    
668    checkpoint48c_post
669    Modifications in treatment of initial flux forcing controls
670    to avoid extra storing of flux fields.
671    
672    checkpoint48c_pre
673    o Added tidal_basin_2d experiment (currently 1D!)
674    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
675    
676    checkpoint48b_post
677    o r* coordinate added in #ifdef NONLIN_FRSURF block.
678     (modification to pressure gradient not yet implemented)
679    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
680      (for U & V) that are used for vertical advection of momentum.
681    
682    checkpoint48a_post
683    o In preparation for r*, use temp. array to compute vertical transport
684       in flux-form momentum pkg. => change results of few test-exp.
685      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
686                        lab_sea, natl_box & plume_on_slope
687    
688    checkpoint48
689    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
690    
691    checkpoint47j_post
692    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
693    o moved adexch from forward_step to addummy_in_stepping
694    o added exch in ctrl_map_...
695    o aveFreq.=0. at end of cost_final to avoid overwrite in
696      reverse checkpointing loop
697    o Yet more changes in gmredi:
698      * adgmredi_calc_tensor
699        avoiding all recomputation of gmredi_slope_limit
700      * adgmredi_x/y/rtransport
701        added flag for excessive storing to avoid recomp. of
702        u/v/rtans, dTdx/y/z
703        -> this is not really necessary and very memory-consuming
704      * adgmredi_slope_psi:
705        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
706      * gmredi_slope_limit
707        re-activated full calculation of taperfct for case 'ac02'
708    o updating verification/ adjoints of carbon, global_ocean.90x40x15
709    
710    checkpoint47i_post
711    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
712    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
713      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
714    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
715    o gmredi: fix few bugs.
716    
717    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
718    This will be a good checkpoint to plug into the ecco-branch.
719    o few modif.'s to get latest version adjointed
720      (mainly kick out code in ini_linear_phisurf)
721    o modif's to run adjoint with exactConserv
722    o case GM_BOLUS_ADVEC should be cleaned
723      S/R gmredi_slope_psi should be cleaned
724    o verification/carbon now has exactConserv=.TRUE.
725    
726    checkpoint47g_post
727    o time-average AIM output: becomes independent from statvars time-average
728      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
729    o After TAF bug fix:
730      Tested adjoint of gmredi package.
731      Tests were done with checkpoint47 rather than with latest
732      checkpoint47f_post since the latter is broken for the adjoint
733      verification/carbon/ contains both ADM and TLM gradient checks.
734    Here they are, before they get changed/lost/stolen.
735    Mostly modif.'s to fix numerical sensitivities.
736    Gradient checks OK for
737    - GM_taper_scheme:
738      * clipping
739      * ac02
740      * linear
741      * glw91
742      * dm95
743      * ldd97
744    - GMREDI_OPTIONS:
745      * GM_VISBECK_VARIABLE_K
746      * GM_NON_UNITY_DIAGONAL
747      * GM_EXTRA_DIAGONAL
748      * GM_BOLUS_ADVEC
749    in conjunction with data.gmredi parameters to be checked in
750    in a few minutes under verification/carbon/code/
751    
752    checkpoint47f_post
753    Merging from release1_p10:
754    o modifications for using pkg/exf with pkg/seaice
755      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
756        and SEAICE_EXTERNAL_FLUXES
757      - pkg/exf CPP options EXF_READ_EVAP and
758        EXF_NO_BULK_COMPUTATIONS
759      - usage examples are Experiments 8 and 9 in
760        verification/lab_sea/README
761      - verification/lab_sea default experiment now uses
762        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
763    
764    checkpoint47e_post
765    o created a tag prior to creating a branch
766    
767    checkpoint47d_post
768    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
769      at the bottom boundary had an erroneous half slip boundary condition
770    o added bottom drag and no slip boundary condition capabilities to
771      oceanic pressure coordinates code
772    o added new verification experiment global_ocean_pressure, this experiment is
773      also described in the tutorial section of the manual
774    checkpoint47d_pre
775    
776    checkpoint47c_post
777    o Added a verification experiment for a global cubed-sphere ocean run
778      -  verification/global_ocean.cubed32x32x30
779      -  uses pkg/therm_seaice and pkg/bulk_forcing
780    
781    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
782    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
783      when using P-coordinate; only implemented for atmospheric config.
784    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
785      NOTES: requires option NONLIN_FRSURF to be "#define".
786    o update advect_xz/results/output.txt (left from checkpoint44g_post)
787    
788    checkpoint47b_post
789    Merging from release1_p9:
790    o pkg/seaice
791      - removed GOTO's and added taf directives
792      - double precision constants to reduce the g77 (Linux)
793        to F77 (SGI) differences reported in release1_p8
794    o tools/genmake
795      - added SGI options
796    o verification/testscript
797      - updated to that of checkpoint47a_post
798    o verification/global_ocean.90x40x15/input/eedata
799      - modified for SGI f77 compatibility
800    o verification/lab_sea
801      - added description of sea-ice model
802      - added missing matlab routines
803      - added test of thermodynamics parallelization
804    
805    checkpoint47a_post
806    o new pkg: aim_v23
807     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
808       for now, keep the same surface forcing as before.
809     - Part-Cell implemented into AIM; check that Heat & Water are conserved
810     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
811     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
812    o add diagnostic of surface correction term in monitor output
813    
814    o bulk_force and therm_seaice
815    - Two packages:  bulk_force (Bulk forcing)
816      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
817    - Earlier integration from Stephaine Dutkiewicz
818      and Patrick Heimbach.
819    - Two ifdef statements for compile time,
820       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
821    
822    checkpoint47
823    differentiable version of checkpoint46n_post
824    o bug fix in quasihydrostaticterms
825    o * "clean" adjoint code (in terms of extensive recomputations)
826        can now be obtained for all GMREDI options (i.e. for
827        - GM_VISBECK_VARIABLE_K
828        - GM_NON_UNITY_DIAGONAL
829        - GM_EXTRA_DIAGONAL
830        - GM_BOLUS_ADVEC )
831      * However, wrong gradient check problem remains unsolved.
832      * New CPP options have been introduced for different
833        tapering schemes
834    o external_fields_load now part of differentiation list
835    o pressure needs multiple storing;
836      would be nice to have store_pressure at beginning or
837      end of forward_step, e.g. by having phiHyd global (5-dim.)
838      (NB: pressure is needed for certain cases in find_rho,
839      which is also invoked through convective_adjustment).
840    o recomputations in find_rho for cases
841     'JMD95'/'UNESCO' or 'MDJWF' are OK.
842    o #define ATMOSPHERIC_LOADING should be differentiable
843    o ini_forcing shifted to begining of initialise_varia
844    o Incorporating QNVS line search routines into MITgcm
845      (this is separate code, and therefore not under pkg)
846      lsopt/, optim/
847    o Updated verification/carbon/
848      - #define GM_VISBECK_VARIABLE_K
849      - GM_taper_scheme    = 'ldd97'    
850    
851    checkpoint46n_post
852    Merging from release1_p8:
853    o verification/natl_box:
854      updating new external_fields_load routine
855    o New package: pkg/seaice
856      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
857      The sea-ice code is based on Hibler (1979-1980).
858      Two sea-ice dynamic solvers, ADI and LSR, are included.
859      In addition to computing prognostic sea-ice variables and diagnosing
860      the forcing/external data fields that drive the ocean model,
861      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
862      The implied surface heat flux is then stored in variable
863      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
864      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
865      non-local transport term.  Because this call precedes model
866      thermodynamics, temperature under sea-ice may not be "exactly" at
867      the freezing point by the time theta is dumped or time-averaged.
868      N.B.: fairly large differences in accuracy occur across
869            different platforms/compilers; comparison between
870            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
871            generated output gives:
872       T           S           U           V
873      C D M    c        m  s        m  s        m  s        m  s
874      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
875      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
876      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
877    
878      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
879    o GAD:
880      - generated new common blocks to account for call of
881        same gad routines with differing traceridentities
882        (needed to modify tracerIdentity indices in GAD.h)
883      - generated separate common blocks for case useCubedSphereExchange
884        (Department of Futurology)
885      - parameter lists to gmredi_?transport: added tracerIdentity
886      - added new key indices to tamc.h
887    o external_fields_load:
888      - added this routine to TAF list
889      - needed to make some common blocks global and additional storing
890        along the same lines as exf package (checkpoint_lev?_directives.h)
891    o exf:
892      updated external forcing package
893      - bug fixes carried over from ecco-branch
894        (missing OBCS_OPTIONS.h in two routines)
895      - enable easy to use "no forcing".
896      - added exf I/O for atmospheric loading
897      - added exf I/O for runoff data
898      - transfered scaling between exf <-> MITgcm to exf namelist
899    o Adding new verification experiment global_with_exf.
900      This verification experiment is almost identical to the
901      global_ocean.90x40x15 experiment, except that it uses
902      the exf (and cal) package instead of the
903      external_fields_load routine (cf README file).
904    
905    checkpoint46m_post
906    o modified testscript to return -- when there are no lines of "%MON" output
907    o added new flag "quasiHydrostatic" for QH mode
908      and new routine quasihydrostaticterms()
909    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
910      New routine: mom_u_coriolis_nh()
911    o fixed sign of non-hydrostatic metric terms in u and v equations.
912      Depend on correct sign of gravitySign.
913    o added work.pc* to .cvsignore in aim directories using ifc
914    o introduced flag for controllin non-hydrostatic metric terms
915    o removed gravitySign from PARM04
916    o switched to g77/ifc from pgf77 in aim experiments
917    
918    checkpoint46l_post
919    o made convective adjustment work with pressure coordinates:
920     - changed the direction of k-loop in convective_adjustment.F for the
921       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
922     - adjusted the reference pressure k-index in convective_adjustment.F
923     - adjusted the convection condition in convect.F (in analogy to
924       calc_ivdc.F)
925     - convective_adjustment no longer computes anything on the halos
926     - removed the warnings about negative salinity from find_rho.F and
927       find_alpha.F; instead the new routine look_for_neg_salinity, called
928       at the beginning of find_rho, find_alpha, and find_beta, does a
929       check of the entire slice, if CPP-option
930       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
931    checkpoint46l_pre
932    
933    checkpoint46k_post
934    o fixed the verification/global_ocean.90x40x15 experiment:
935     - new bathymetry (the world according to A., JMC, and M.)
936     - new initial fields and forcing fields (*.bin files)
937     - new POLY3.COEFFS (for the next release one should switch to a full
938       equation of state: JMD95P or MDJWF)
939     - fixed several errors and redundancies in the data file
940     - experiment uses looped cells
941     - added matlab directory with diagnostic scripts for plotting of output
942    
943    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
944     - read AIM physics parameters from a file (data.aimphys)
945     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
946    
947    checkpoint46j_post
948    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
949    o move wVel computation at the end of the time step, in S/R integr_continuity
950    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
951    o update timeave pkg for wVel diagnostic.
952    checkpoint46j_pre
953    
954    checkpoint46i_post
955    o Clean up AIM package (and keep the results unchanged):
956      include CPP_OPTION and use IMPLICT NONE in all routines ;
957      declare all the variables _RL ; use _d 0 for all numerical constants.
958      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
959    
960    checkpoint46h_post
961    o cleaned up the use of rhoNil and rhoConst.
962      - rhoNil should only appear in the LINEAR equation of state, everywhere
963        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
964        and the dynamical equations are all divided by rhoConst
965    o introduced new parameter rhoConstFresh, a reference density of fresh
966      water, to remove the fresh water flux's dependence on rhoNil. The default
967      value is 999.8 kg/m^3
968    o cleanup up external_forcing.F and external_forcing_surf.F
969      - can now be used by both OCEANIC and OCEANICP
970    checkpoint46h_pre
971    
972     Added code to convert surface volume flux (fresh water) into
973     a mass flux when using P coordinates in the ocean (OCEANICP).
974     Note: It assumes you have set rho0=rhoConst=density of fresh water.
975    
976    checkpoint46g_post
977    o Include a new diagnostic variable phiHydLow for the ocean model
978      - in z-coordinates, it is the bottom pressure anomaly
979      - in p-coordinates, it is the sea surface elevation
980      - in both cases, these variable have global drift, reflecting the mass
981        drift in z-coordinates and the volume drift in p-coordinates
982      - included time averaging for phiHydLow, be aware of the drift!
983    o depth-dependent computation of Bo_surf for pressure coordinates
984      in the ocean (buoyancyRelation='OCEANICP')
985      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
986        Theta, Salinity, and Pressure in the parameter list. This routine is
987        presently contained in find_rho.F. This routine does not give the
988        correct density for 'POLY3', which would be a z-dependent reference
989        density.
990    o cleaned up find_rho
991      - removed obsolete 'eqn' from the parameter list.
992    o added two new verification experiments: gop and goz
993      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
994    checkpoint46g_pre
995    
996    checkpoint46f_post
997    o Enable tangent linear (forward mode) gradient checks:
998      - extended active file handling to g_... files
999      - added TANGENT_SIMULATION to theSimulationMode
1000      - extended grdchk package accordingly
1001    o added tangent linear setup in verification/carbon/code_ftl
1002    o added adjoint setup in verification/front_relax/code_ad
1003    
1004    checkpoint46e_post
1005    o Added new equation of state -> MDJWF
1006      - EOS of McDougall et al., 2002, JAOT, submitted
1007      - caveat: the equation of state is only valid for a smaller (more
1008        realistic?) range of values than JMD95P/Z and UNESCO
1009      - added masks to the calculation of pressure in store_pressure
1010      - added more check values for density in check_eos (ini_eos.F), some of
1011        the old check values are out of the range of the MDJWF-eos, so don't
1012        expect perfect matches for those
1013    checkpoint46e_pre
1014    
1015    checkpoint46d_post
1016    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
1017      'OCEANICP', also initialised field pressure correctly in ini_eos in the
1018      case of pressure coordinates. eosType='JMD95Z' in
1019      combination with buoyancyRelation='OCEANICP' now causes an error.
1020    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1021      in find_alpha/beta.
1022    checkpoint46d_pre
1023    
1024    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1025      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
1026    
1027    checkpoint46c_post
1028    o Changes necessary for ocean in p-coordinates
1029     -  Added new buoyancy relation = 'OCEANICP'
1030     -  Added new parameters = gravitySign (this used to be contained inside
1031        the factor dRdZ which I added when we first switched to R coordinates).
1032     X GM/Redi is not compatible (yet)
1033     X bottom drag and no-slip need to be debugged.
1034    checkpoint46c_pre
1035    
1036    checkpoint46b_post
1037    o Added new equation of state -> JMD95Z and JMD95P
1038      - EOS of Jackett and McDougall, 1995, JAOT
1039      - moved all EOS parameters into EOS.h
1040      - new routines ini_eos.F, store_pressure.F
1041    o Added UNESCO EOS, but not recommended because it requires
1042      in-situ temperature (see JMD95)
1043    o Modified formatting for knudsen2.f in utils/knudsen2 and added
1044      unesco.f to be used with POLY3
1045    checkpoint46b_pre
1046    
1047    checkpoint46a_post
1048    o Added (atmospheric) pressure loading
1049      - new field in FFIELDS.h, etc...
1050      - new cpp flag ATMOSPHERIC_LOADING
1051    o Changed hFacC to _hFacC in calc_phi_hyd.F
1052    o Added SHORTWAVE_HEATING to some files for consistency
1053    checkpoint46a_pre
1054    
1055    checkpoint46
1056    further merges from release1_p5
1057    o new ctrl package
1058      - adopted from ECCO environment to enable optimization
1059      - added Eliassen Palm fluxes to controls
1060    o added Eliassen Palm flux controls to gradient check package
1061    o cost package
1062      - Compatible with new ctrl package
1063      - added Eliassen Palm cost hooks
1064      - modif's of existing cost functions
1065    o Adjoint-related bug fixes in kpp:
1066      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
1067      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
1068    o autodiff package
1069      - flow directives:
1070        + new for S/R do_the_model_io
1071        + enhanced for S/R checkpoint
1072        + new gmredi.flow
1073      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
1074        disable adcommon.h/g_common.h by default.
1075      - fixed problem for adjoint of global_max
1076    o modified verification/carbon/
1077    o New setup for adjoint of global_ocean
1078    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
1079    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
1080    o incorporated hooks for sponge layer code (external_forcing.F)
1081    
1082    checkpoint45d_post
1083    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
1084    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
1085      (affects plume_on_slope "cg2d" output)
1086    o add new parameter deltaTfreesurf for free-surface time stepping
1087    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
1088    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
1089    o change phiMin in exp1 (to agree with documentation)
1090    o add new flags:
1091     - T,S forcing inside/outside Adams-Bashforth
1092     - turn off temp,salt advection and/or forcing
1093     - for each tracer, define internal flag for multiDimAdvection & A-B
1094    o monitor: change definition of KE to check conservation of Energy
1095    
1096    checkpoint45c_post
1097    o Removed f90 comments ("!")
1098    o Modified initialisations to enable exf package for MITgcm
1099      (without invoking ECCO_PACKAGE).
1100    o modifications to gradient check package (Martin Losch)
1101      - enable centered differences
1102      - modified format of standard output
1103    
1104    checkpoint45b_post
1105    o cleaned exchange calls in cg2d
1106    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
1107    o included CPP option SINGLE_LAYER_MODE in thermodynamics
1108      to configure barotropic setup (Martin Losch)
1109    o moved some initialisations within bi,bj loop in dynamics
1110      (TAF flow dependency)
1111    o in initialise_varia, moved call packages_init_variables
1112      before convective_adjustment_init
1113      (corresponding adjustment of TAF tape initialisation).
1114    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
1115    
1116    checkpoint45a_post
1117    o compute Rho over the whole domain (extend iMin,jMin indices)
1118    o specific exchange for X-slice domain (case Ny=1)
1119    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
1120    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
1121    
1122    checkpoint44h_post = checkpoint45
1123    o Fix to restore differentiability:
1124      place at which packages_init_variables is called in
1125      initialise_varia is crucial for reverse control flow.
1126    o modifications in GMRedi to enable stable adjoint
1127      (corresponding modif's in thermodynamics, dynamics)
1128    o added missing hook for sponge layer code in external_forcing
1129    o modified test cost functions
1130    o storing in gad_advection (plus removal of write(0,*)!
1131    o missing headers TR1.h added in convective_adjustment routines
1132    o errorMessageUnit set non-equal zero in eeboot
1133      (conflict on some platforms, e.g. IBM SP3)
1134    o modified carbon verif.
1135    
1136    checkpoint44h_pre
1137    o vertical grid option: allow to put the Interface at the middle between
1138      2 cell-centers ; replace delZ in pkg/kpp by drF.
1139    o GM Advective form: Tracers are advected using the residual transport (=
1140      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
1141    
1142    checkpoint44g_post
1143    o fix surface correction term in multiDimAdvection (affects plume_on_slope
1144      results) ; ifdef missing in thermodynamics.F
1145    
1146    checkpoint44f_pre,checkpoint44f_post
1147    o added PTRACERS package
1148      This allows an arbitrary number of passive tracers to be integrated
1149      forward simultaneously with the dynamicaly model.
1150      + Implemented so far:
1151        - basic forward algorithm (time-stepping, advection, diffusion, convection)
1152        - I/O and checkpointing
1153        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
1154      + Not implemented so far:
1155        - KPP
1156        - OBCS
1157      + No specific example supplied (yet) but global_ocean.90x40x15 has the
1158        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
1159        line in data.pkg.
1160      + This package is disabled by default since it increases storage.
1161    
1162    
1163    o testscript: added -cleanup option
1164    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
1165                 b) enable to filter 2D fields.
1166    
1167    checkpoint44e_pre,post
1168    o re-wrote convective adjustment to use pre-calculated weights
1169      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
1170      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
1171      Original calls to convect() still in place.
1172    
1173    chkpt44d_pre,post
1174    o added missing EXCLUDE_MONITOR flags
1175    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
1176      (incompatible typ in MIN/MAX expressions caused problems
1177      on IBM SP3)
1178    o in genmake added variable MAKEDEPEND
1179      plus resetting for case SunOS
1180    o added timer_stats.c routine for IBM SP3
1181    o removed variables in dynamics
1182    !!! I forgot to create tag chkpt44d_pre !!!
1183    !!! But chkpt44d_pre = chkpt44c_post    !!!
1184    
1185    o real fresh water flux implemented with non-linear free-surface.
1186    
1187    chkpt44c_pre,post
1188    o few fix (mask in shap_s2, EmPmR in external_field_load,
1189      USE_NATURAL_BCS in solve_for_P);
1190    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
1191    
1192    checkpoint44b_pre/_post
1193    o merge of relevant stuff from the ecco-branch:
1194      - genmake: removed $S64 overwrite for case SunOS
1195      - pkg/exf: update and corrections for field swapping and obcs
1196      - pkg/ecco: parameter lists for the_model_main, the_main_loop
1197                  harmonized between ECCO and MITgcm
1198      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
1199                      updated checkpointing_lev... lists for obcs
1200      - model/src: minor changes in forward_step, plot_field
1201                   added directive for divided adjoint in the_main_loop
1202      - pkg/mdsio: added mdsio_gl_slice
1203    
1204    o check parameters & config (chkpt44a_pre,post)
1205    o OBC and NonLin_FrSurf.
1206    
1207    checkpoint44
1208    o fix bug in mom_vi_del2uv
1209    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
1210    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
1211    o update AIM experiments (NCEP input files)
1212    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
1213    o added some stuff for AD
1214    
1215    checkpoint43
1216    o added two new advection tests
1217    o added global 4x4 degree ocean test
1218    o added test of H&S94 with free surface on cube
1219    o some final mods for gradient check, adjoint,...
1220    
1221    checkpoint42
1222      Fixed AD-related problems:
1223    o Store directives up-to-date with re-arranged Adams-Bashforth
1224      (mainly thermodynamics.F)
1225    o New store directives for multi-dim. advection schemes
1226      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
1227      * new common block and key passkey
1228      (mainly gad_advection.F)
1229    o Modified store directives for split of dynamics/thermodynamics
1230      for the case ALLOW_KPP
1231    o Cleaned argument list for timestep_tracer.F
1232    
1233    checkpoint41
1234    o re-formatted/added comments in prologues of key subroutines
1235      to work with protex
1236    
1237    checkpoint40
1238    o moved calc_gs, calc_gt and calc_tr1 back to model/src
1239    o added FLT (floats) package from Arne along with demo. experiment
1240    o re-arranged Adams-Bashforth scheme for tracers to allow easier
1241      implementation of forward-in-time forcing terms
1242    o more mods for non-linear free-surface including new variable
1243    o modified multi-dim method to work on cube
1244    o bug fix in KPP (from DM)
1245    
1246    checkpoint40pre9
1247    o added DST advection schemes
1248    o fix MPI bug on SGI's
1249    o modifications for non-linear free-surface
1250    o fixed conditionals for fixed flow/passive tracer only mode
1251    o added tension/strain form of stress tensor
1252    o changes to commenting of arguments for TAF/TAMC
1253    o added/updated many matlab scripts
1254    o added multi-dimensional advection method for tracers
1255      
1256    checkpoint40pre8
1257    o new package rw/
1258      Added method for dumping intermediate local arrays:
1259      mdsio_writetile - same as mdsio_writefield except works from inside
1260                        bi,bj loop
1261      mdsio_writelocal - same as mdsio_writetile except works for local
1262                         arrays
1263      write_local_r? - higher-level wrapper for mdsio_writelocal
1264      Controlled by diagFreq. Defaults to zero (ie. no dumps)
1265      Example given at end of mom_vecinv.F that dumps some local arrays.
1266    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
1267      control flux-form versus vector invariant code.
1268      Switch is runtime flag vectorInvariantMomentum (defaults to false)
1269      or genmake -DISABLE ...
1270    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
1271      (additional storing is now needed for case vecinv;
1272      currently nothing implemented to switch this storing off
1273      in case fluxform is used since no CPP flag available).
1274    
1275    checkpoint40pre7
1276    o bug fix in dynamics.F
1277      calc_viscosity called before k=1,Nr loop.
1278    o added some #ifdef's ALLOW_PASSIVE_TRACER
1279    o cleaned initialisations in ctrl_map_ini
1280      related to TAF
1281    
1282    checkpoint40pre6
1283    o split dynamics into thermodynamics & dynamics
1284    o corresponding split of calc_diffusivity into
1285      calc_diffusivity, calc_viscosity
1286      (kpp_calc_diff, kpp_calc_visc).
1287    o Added diffkr, kapgm to control variables
1288    o bug fix in gmredi_slope_limit for ldd97
1289    
1290    checkpoint40pre5
1291    o proper initialization of Adams-Bashforth time stepping
1292      + uses forward step for very first step of model (iter=0)
1293    o re-generated *all* output since almost all output is modified by this
1294      change (sorry but we've been putting this one off for about 2 years)
1295      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
1296        *not* regenerated since they are already out of date and I don't
1297        want to create the impression that they are suddenly working.
1298    o removed KAP stuff for DEC's
1299    o modified/added many .cvsignore files in */code and */input
1300    o added new expt "solid-body.cs-32x32x1"
1301      + this uses an alternative form of ini_curvilinear_grid.F which
1302        is not necessarily any better than the current one...
1303    
1304    checkpoint40pre4
1305    o added re-initialisations of utrans,vtrans,rtrans in
1306      calc_common_factors which are crucial for TAF.
1307    o extended iMin,jMin range for calc_common_factors,
1308      calc_diffusivity
1309    o added option ALLOW_PASSIVE_TRACER
1310    o a few minor updates and fixes
1311    
1312    checkpoint40pre3
1313    o created calc_gtr1.F for gad package
1314    o split the_main_loop and re-introduced forward_step
1315    o some recomputations of nIter0 for TAMC
1316    
1317    checkpoint40pre2
1318    o Updated to latest branch of AJA, JMC
1319    o Added gradient check package
1320    o Added routines for passive tracer handling
1321    o Added carbon sequestration sensitivity experiment
1322    
1323    checkpoint39
1324     o Modifications and fixes to support TAMC
1325       (mainly missing or wrong directives)
1326     o Corrected common blocks when fooling TAMC to produce adjoint I/O
1327       in addummy_in_stepping
1328     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
1329     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
1330     o Included following packages:
1331       cal: calendar
1332       exf: external forcing
1333       ecco: essential routines to control use of cal, exf
1334             (NB: this is not the full ECCO environment)
1335     o disabled some packages by default in genmake
1336    
1337    checkpoint38
1338     o see notes_c37_adj.txt
1339     o corrected wrong layer index in external_forcing_t
1340     o replaced the_main_loop/forward_step by the_main_loop
1341     o removed forceoutput from write_state
1342       (replaced criteria for initial/final state)
1343     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
1344    
1345    checkpoint37
1346     o mdsio.F routine split and packaged in pkg/mdsio
1347       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
1348        used unless genmake -disable=mdsio)
1349     o allow a more precise surface-geopotential gradient for the atmosphere
1350       taking into account the change in space of Alpha (=1/rho) at the surface.
1351     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
1352       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
1353     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
1354       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
1355       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
1356     o Time-Average diagnostics defined as a pseudo package "timeave".
1357     o pickup files : old pickup (before c35) did not work with new code (c35
1358       and after) unless activating 2 commented lines in initialise-varia.
1359     o Non-Hydrostatic pickup file Pb fixed.
1360     o bug with Rigid-lid version (since c35) fixed.  
1361    
1362    checkpoint36
1363     o implement Crank-Nickelson barotropic time-stepping
1364     o recover Time-Average diagnostics
1365     o fix Pb in checkpoint (PR#19)
1366     o AIM become a standard package ; clean unused CPP_kees
1367    
1368    checkpoint35
1369     o subtantial rewrite of dynamics.f
1370     o allows staggered time-stepping
1371     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
1372     o added bottom drag (linear + quadratic)
1373    
1374    checkpoint34
1375     o Modified exchange routines for correct reverse simulation.
1376     o Added verification output to comply with bug fix in impldiff.F
1377       as of c33 (exp2, natl_box).
1378     o Corrected store directives in dynamics.F
1379     o Corrected array boundaries in impldiff.F
1380     o Corrected array dimensions in gmredi.
1381       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
1382     o Added routine GLOBAL_SUM_INT to global_sum.F
1383     o Added mdsio_gl.F for ECCO purposes.
1384    
1385    checkpoint33
1386     o Fixed bug in lower BC in impldiff.F
1387     o Fixed confusion about units of forcing arrays in FFIELDS.h
1388       namely Fu,Fv,Qnet,Qsw,EmPmR:
1389       - Removed verification/natl_box/code/external_fields_scale.F
1390         (did not differ from that in model/src)
1391       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
1392         (see FFIELDS.h for description)
1393       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
1394         kpp_calc.F and kpp_transport_t.F
1395       - Removed model/src/external_fields_scale.F and calls to it
1396       - verification/natl_box uses flux data with "atmospheric" sign so
1397         a special version of external_fields_load.F is used to
1398         change the data as it's read in. This way, the arrays
1399         have the right units and signs at all times tha a user could
1400         possibly use them.
1401     o Corrected genmake to delete a temporary file during configuration
1402    
1403    checkpoint32
1404     o Scaling of forcing fields moved from external_forcing.F to
1405       external_fields_scale.F, called directly after loading fields.
1406     o Surface relaxation terms added to surface tendency fields in
1407       extra subroutine.
1408     o impldiff.F changed to avoid storing by TAMC of huge intermediate
1409       fields.
1410     o Changes in GMRedi to comply with packaging structure.
1411     o Modifications and bug fixes in KPP package.
1412     o Verification experiment for KPP added (verification/nat_box/)
1413    
1414    checkpoint31
1415     o Packages interface brought in line with defined standard
1416       -> new routines packages_...F
1417       -> changes in initialise_fixed.F, initialise_varia.F
1418       -> enables initialisation interface for ECCO package
1419     o Rescaling of external forcing fields immediately after read
1420       (removed from external_forcing.F)
1421       -> new: surface_fields_scale.F
1422       -> affects ini_foorcing.F, external_fields_load.F
1423     o Computation of surface tendencies before tendency updates.
1424       -> new: external_forcing_surf.F
1425     o Change of variable names useGMRedi, useKPP, useECCO
1426     o Further changes in dynamics.F, impldiff.F for TAMC
1427     o Tested for experiments 0, 2, 4.
1428       - not yet tested for GMRedi.
1429       - not yet tested for KPP.
1430    
1431    checkpoint30
1432     o Updates for OBCs
1433     o New experiment for test OBCs (internal_wave)
1434     o New output.txt in verification/exp4/results/
1435     o Updates for KPP: calculation of viscosity corrected, new variables
1436       kpp_dumpFreq and kpp_taveFreq
1437     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
1438       and entry for T90 in genmake
1439    
1440    checkpoint29
1441     o packaged KPP and GM/Redi
1442    
1443    checkpoint28
1444     o Corrected initialization of hFacMin for difference vertical coordinates
1445     o Modified calculation of partial cell thickness to more robust algorithm
1446     o config_summary.F: replaced write_1D_... by write_0D_...
1447       read_write.F: added subroutines write_0D_...
1448     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
1449       included some initialisations required for TAMC.
1450     o routine calc_isoslopes: modified sqrt computation to make it
1451       differentiable for zero argument.
1452     o routines dynamics, impldiff:
1453       included store directives and tape key computations required for TAMC.
1454     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
1455    
1456    checkpoint27
1457     o fixed calc_isoslopes() to so that cancellation of terms in tensor
1458       formulation works properly with variable resolution.
1459     o restructured the calling tree between the_model_main() and dynamics()
1460     o split initialise() into initialise_fixed() and initialise_varia()
1461     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
1462       in new routine ini_psurf()
1463    
1464    checkpoint26
1465     o moved some #ifdef in optional routines to encompass everything
1466       except the argument declarations. This was using up some memory.
1467     o fixed macros like _ADT to work with both versions of Linux cpp
1468     o cleaned up some unused and uninitialized variables
1469       (helps when debugging with strict compile options)
1470     o split up CPP_EEOPTIONS.h into options and macros
1471       (macros are now in eesupp/inc/CPP_EEMACROS.h)
1472     o patch for 2 processor JAM mode
1473    
1474    checkpoint25
1475     o updates for OBCs and NH
1476     o dramatically reduced memory usage
1477     o added "JAM" routines for use on Artic network
1478     o parameterization of convection by implicit vertical diffusion
1479     o added a diagnostic of convective index
1480     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
1481       (this is was partly for OBCs and NH but also in anticipation of
1482        an explicit free-surface option)
1483     o initial state input files for U and V
1484    
1485    checkpoint24
1486     o Removed some spurious "REAL"s
1487     o Updated KPP to latest version from JPL
1488     o Added a COS(latitude) in horizontal viscosity
1489    
1490    checkpoint23
1491     o Added del^4 diffusion for salt and temperature
1492     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
1493    
1494    checkpoint22
1495     o Made many small changes: implicit none, format(i5), etc...
1496     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
1497    
1498    checkpoint21
1499     o Introduced new I/O package that supports direct-access records (mdsio.F)
1500     o Split-up mid-level I/O routines
1501     o Updated input data for experiments 0,1,2,4 and 5
1502     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
1503    
1504    checkpoint20
1505     o Tidied up open-boundaries some more
1506     o Added non-hydrostatic code
1507     o Fixed some input data
1508     o Modified MPI start-up to work in "coupled" context.
1509    
1510    checkpoint19
1511     o Tidied up directory structure for verification experiments.
1512     o Added new code for open boundaries.
1513     o Corrected advective terms near boundaries.
1514     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
1515     o Implemented free-slip/no-slip BCs and del^4 dissipation.
1516     o Split default parameters out of ini_parms.F into set_defaults.F.
1517    
1518    checkpoint18
1519     o Further changes for optional code generation with
1520       CPP - ugh!
1521    
1522    checkpoint17
1523     o Beginning to incorporating modularity
1524       for supporting atmos. and ocean configs.
1525     o Small changes for TAMC complinace
1526     o New ultra simple test case. Barotropic box
1527       configuration "exp0".
1528    
1529    checkpoint16
1530     o Minor changes to exchange routines to support
1531       accumulation in reverse mode. Adjoint of an
1532       assignment is an addition.
1533     o Changes to support compilation by TAMC (LR(1)
1534       syntax) and by g77 under Linux ( 72 character
1535       limit ).
1536    
1537  checkpoint15  checkpoint15
1538   Rewrote exchange routines to allow   Rewrote exchange routines to allow
1539   o General tile <-> tile connectivity.   o General tile <-> tile connectivity.

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