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revision 1.16 by cnh, Tue Nov 3 15:31:08 1998 UTC revision 1.265 by jmc, Fri Mar 5 02:50:25 2004 UTC
# Line 2  $Header$ Line 2  $Header$
2    
3      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
4      ==============================      ==============================
5    o fix problem (when 1 tile is empty) in min/max monitor.
6    o fix bug in timeAve (u,vZetatave in common block)
7    o no restoring terms under ice for pkg/seaice
8    o moved SEAICE_DO_DIAGS to S/R do_the_model_io
9    o bug fix for pkg/seaice pickups
10    o change MNC call locations and add coordinate attributes
11    o mask vorticity at the corner ; affects global_ocean.cs output
12    o fix ini_curvilinear_grid ; test CS experiments with mpi
13    o aim.5l_cs: modify sea-ice fraction input file ; update output
14    o exf: Adding simple range check routine for exf fields after read
15    
16    checkpoint52k_post
17    o removed top-level directory "diags"
18      - we migrated these functions to pkg/timeave a long time ago
19    o fixed bug introduced in pkg/monitor
20    o accuracy ctrlprec = 32 insuffient for gradient checks using
21      averaged fields (I/O via cost_averages)
22      -> use ctrl.h in active_file*.F to control I/O precision.
23    o paramter list of CALL ADTHE_MAIN_LOOP
24    o added initial do_the_model_io to ecco
25    o set all ...Freq to zero after cost_final
26      taveFreq, dumpFreq, pChkptFreq
27    o MAIN and ECCO differentiability restored
28    
29    checkpoint52j_post
30    o fix nchklev in tamc.h for global_ocean...
31    o Bringing flow and store directives up-to-date
32    o Really weird thing!
33      call do_the_model_io from the_main_loop with parameters
34      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
35      TAF places a faulty re-call of initialise_varia
36      after cost_final call which should not be there!
37    checkpoint52j_pre
38    
39    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
40      error messages
41    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
42    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
43      debug output
44    o modfied mdsio_writefield.F to handle non-global files under exch2
45    o update AIM Cubed-Sphere exp (aim.5l_cs):
46      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
47    o update AIM Equatorial Channel exp:
48      use standard aim_v23 pkg and change the SST fields to be more realistic.
49    o globalFile now works with exch2
50    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
51      mon_vort3.F to make exch2 friendly with >1 tile per cube face
52    o limit timeave output for hi-res integrations
53    
54    checkpoint52i_post
55    o removed CPP_EEOPTIONS.h from verification/*/code
56    o updated the tiling for global_ocean_pressure
57    checkpoint52i_pre
58    
59    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
60      the old pkg/aim).
61    
62    checkpoint52h_pre
63    o shortened offending lines in exch2_send_rx?.template
64    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
65    o genmake2: add build & execute test for NetCDF code
66    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
67      old grid files, moved CPP_EEMACROS.h to pkg/exch2
68    o added useSingleCPUIO flag to monitor.F and mon_out.F
69    o added temporary hack for sea-ice dynamics on the cube:
70      metric terms are ignored and it is assumed that
71      there is no sea-ice on cube faces 1, 2, 4, and 5.
72    
73    checkpoint52f_post
74    o added exch2 cube routines to pkg/exch2
75    o modified hs94.cs-32x32x5 to use it
76    o added new grid files to hs94.cs-32x32x5
77    checkpoint52f_pre
78    
79    checkpoint52e_post
80    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
81      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
82    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
83      to work with implicit vertical advection and AB ;
84    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
85    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
86     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
87    checkpoint52e_pre
88    
89    o fix bug in impldiff when Nr=1 or Nr=2.
90    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
91    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
92    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
93      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
94    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
95    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
96    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
97    
98    checkpoint52d_post
99    o re-tiled many expts to allow comparison in multi-processor mode
100      - updated output accordingly
101      - changed hs94.128x64x5 to use intial T from file rather than use the
102        random number generator
103    o add infrastructure in model routines for fizhi and gridalt packages
104    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
105    o changes to permit hi-res, cubed-sphere, configuration
106      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
107      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
108      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
109        of surface winds for the cube
110      (A verification experiment, based on global_ocean.cs32x15, but with
111       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
112       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
113       complete with example surface forcing files and matlab scripts to look
114       at the output and compare it with that of global_ocean.cs32x15.)
115    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
116       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
117       to conform to the common rule.
118    o check-in the first version of the coupler + interfaces for multi-components
119       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
120       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
121       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
122       - ocean and atmos. share the same horizontal grid (no interpolation).
123       - exchanges between component and coupler is done in forward_step
124    o new verification experiment, cpl_aim+ocn:
125       coupled ocean - AIM atmosphere on cs32 grid.
126    
127    checkpoint52d_pre
128    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
129    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
130    
131    checkpoint52c_post
132    o Fixing OPTIONS files for use of exf:
133      - ALLOW_ECCO not needed
134      - ECCO_CPPOPTIONS.h should not be included from
135        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
136        as has been the case in the past
137      - All cal/exf related options are currently set in
138        single header file. Should remain so until we
139        agree on a consistent new policy.
140    o Removed all CPP options for cal package.
141      cal has no more CPP options.
142    o modified STOREs in GAD_ADVECTION
143    o corrected key comp. for passkey
144    
145    checkpoint52b_post
146    o new version: "thsice" of thermodynamic sea-ice pkg:
147     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
148     - modify fluxes but do not change theta directly;
149     - light cleaning of bulk_force pkg (still needed with thsice).
150     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
151       + output_thsice.txt to test thsice & bulk_force pkgs.
152    o put back grid & coriolis monitor output.
153    checkpoint52b_pre
154    
155    o call "do_the_model_io" at the beginning (=> dump initial state)
156    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
157    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
158      (need info on NUMBER_OF_PTRACERS)
159    o missing PTRACERS headers in some routines
160    o default tamc.h in pkg/autodiff supposed to crash
161      to ensure proper customization
162    
163    checkpoint52a_post
164    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
165      - moved surfaceTendencyTice from pkg/seaice to main code
166      - subroutine FREEZE_SURFACE now limits only surface temperature
167        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
168        => new output.txt for global_ocean.cs32x15 & global_with_exf
169      - keep the old version of FREEZE for backward compatibility;
170        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
171      - corresponding modifs for TAF directives
172    o added surface flux output variables to TIMEAVE_STATVARS
173    o time-averaged output for pkg/ptracers
174    o fix problem with ECCO-related divided adjoint
175      snapshot file was missing some ad-variables,
176      but no warning issued by TAF
177    
178    checkpoint52a_pre
179    o some bug fixes for #undef REAL4_IS_SLOW
180    
181    checkpoint52 = ecco_c52_e35
182    o after testing adjoints of checkpoint51u_post
183    
184    checkpoint51u_post
185    o this is the post-merge tag of the ecco-branch
186      (needs another clean checkout and re-testing)
187    o various natl_box_adjoint configs and results
188      but no input fields
189    o obcs adjoint not yet merged!
190    o adding ECCO global 1x1 and 2x2 degree configs
191    o updated/extended some store directives for seaice
192    o pkg/ecco now containes ecco-specific part of cost function
193    o top level routines the_main_loop, forward_step
194      supersede those in model/src/
195      previous input data.cost now in data.ecco
196      (new namelist ecco_cost_nml)
197    o in ctrl/ cleaned some cross-dependencies and updated CPP options
198    
199    checkpoint51t_post
200    o this is the pre-merge tag of the ecco-branch
201    
202    checkpoint51s_post
203    o cleanup: removed various obsolete #define-s
204    o pkg/grdchk
205      - renamed 'ph-grd 3' to 'grad-res'
206      - merged from ecco-branch
207        (remaining bug fixes for obcs gradient checks)
208      - additional high-precision output for testreport
209        (grep for 'precision_grdchk_result')
210    
211    checkpoint51r_post
212    o cleaned up or removed CPP_OPTIONS.h files
213    o updated results for some of the tests to reflect the new
214      optfiles (-ieee: -O0 instead of -O3)
215    
216    checkpoint51q_post
217    o cd_code:
218      - moved cd_scheme.F -> cd_code_scheme.F
219      - separate read_checkpoint from cd_code_ini_vars.F
220      - separated cd_code part from write_checkpoint
221      - updated AD_SOURCE, generated .flow
222      - added CD_CODE_VARS.h to the_main_loop
223      - Moving cd_code specific store dir.s to pkg/cd_code
224    o ctrl package totally restructured
225      - pack/unpack now optional and decoupled from
226        xx_/adxx_ I/O
227      - ctrl_pack/unpack cleaned
228        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
229      - confined inclusion of AD_CONFIG.h to where necessary.
230    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
231    
232    checkpoint51p_post
233    o create initial cd_code package
234      - WARNING: the initialization of fields within packages
235        is broken because INI_FIELDS (where READ_CHECKPOINT is
236        called) is called *before* PACKAGES_INIT_VARIABLES.
237        This seems to be backwards since
238        1) its important to initially zero the entire field including
239           the "halo" region
240        2) zeroing needs to be done *before* reading pickup info
241           and the pickup call might or might not happen in any
242           particular run
243      - this needs an overhaul for R2
244    o cleanup verification/*/code/GMREDI_OPTIONS.h
245    o cleanup testreport
246    
247    checkpoint51o_post
248    o bringing AD-related verif's up to date with genmake2
249      - carbon/
250      - global_ocean.90x40x15/
251      - hs.94.1x64x5/
252      - (front_relax/ )
253    o (more) consistent directory structure for AD-related verif.'s
254    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
255    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
256    o bug fix in find_alpha.F for MDJWF:
257      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
258        change rho -> rho-rhoConst
259      - replace call find_rho to find_rhonum
260    o initialisation of rFlx extended to full array (required by TAF)
261      and shifted to thermodynamics
262    o removed PTRACERS.h in ptracers routine
263    o added surfacetendencyPtr to S/R parameter list pracers_forcing
264    o Correcting initialisations for fVerU, fVerV.
265    o helping TAF to recognize dependency on kUp for
266      fVerU, fVerV
267    o Replacing delZ by delR in pkg/ctrl/
268    checkpoint51o_pre
269    
270    o undid all of cp51 pending some cleanups and discussion
271    o added the [#include "AD_CONFIG.h"] statement to all files that need
272       it for adjoint/tl #defines
273     o re-worked the build logic in genmake2 to support AD_CONFIG.h
274     o removed tools/genmake since it no longer works
275    
276    checkpoint51n_post
277    o modifications to make FREEZE flux visible to pkg/kpp
278      - moved surfaceTendencyTice from pkg/seaice to main code
279      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
280      - subroutine FREEZE now limits only surface temperature
281        (this means new output.txt for global_ocean.90x40x15,
282         global_ocean.cs32x15, and global_with_exf)
283    o added surface flux output variables to TIMEAVE_STATVARS
284    
285    checkpoint51n_pre
286    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
287    o added [#include "AD_CONFIG.h"] to all files that use the following
288      defines:
289      - ALLOW_ADJOINT_RUN
290      - ALLOW_TANGENTLINEAR_RUN
291      - ALLOW_ECCO_OPTIMIZATION
292    
293    checkpoint51m_post
294    o incorporating changes to get TAMC/TAF working in genmake2
295      - added new TAMC/TAF targets to the Makefile
296      - various cleanups related to package handling
297      - these changes should have no impact on the forward model
298    
299    checkpoint51l_post
300    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
301     - faster algorithm for cal_addtime.F
302     - higher precision arithmetic, where needed
303     - pkg/exf *startdate variables changed from calendar date to
304       model integration time
305    
306    checkpoint51l_pre
307    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
308    o enable to apply restoring on S & T only in a latitude band.
309    o update output (external_forcing_surf modif. change truncation errors)
310       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
311    
312    checkpoint51k_post
313    o change default to: useNHMTerms=.FALSE.
314     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
315       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
316     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
317        exp1, ideal_2D_oce
318     - change data file of oceanic exp (leave the results unchanged for now)
319       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
320    o set gravitySign automatically according to the vertical coordinate used
321      (and change sign: back to "logical" value: +1 when R increases downward)
322    o added an include barrier to the default CPP_OPTIONS.h and
323      removed the #include "PACKAGES_CONFIG.h" from it
324    o fix a bug in mom_fluxform (from chk51j_post)
325    
326    checkpoint51j_post
327    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
328    o adjusted some flow directives (dynamics, thermodynamics)
329    o added cubed-sphere case to test cost function
330    o heckpoint_lev?_directives.h now include
331      pkg-specific directives, whenever those are enabled.
332    o Moving pkg-specific flow directives to corresponding pkg
333      Moving pkg-specific differentiation list to corresponding pkg
334      Moving pkg-specific checkpoint-lev storing to corresponding pkg
335      ---> conventions are
336           - pkg_ad.flow
337           - pkg_ad_diff.list
338           - pkg_ad_check_lev?_dir.h
339    
340    checkpoint51i_post
341    o merge of the branch-genmake2
342      - knowingly breaks the older genmake
343      - automatic generation of all ALLOW_${PKG_NAME} defines
344      - new testreport supersedes older testscript
345    o large number of package inclusion and header cleanups
346    checkpoint51i_pre
347    
348    o new output for adjoin of global ocean vector invariant
349    o fix for checkpoint of thermodynamic seaice and bulk_force
350    o Steph gchem various cleanups
351    
352    checkpoint 51h_pre
353    o fixed some single quotes
354    o modify gchem pkg to be more versatile
355    o modifications to clean up dic pkg
356    o add pkg/cfc
357    
358    checkpoint51g_post
359    o provide links for ARPACK and ADM*TLM
360    o start removing verification/vero/
361    o update AD-related stuff
362      (in particular some IF-statements in model/src/ routines)
363    o adding to verification/global_ocean.90x40x15/ adjoint of
364      vector invariant setup
365    
366    checkpoint51f_post
367    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
368    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
369      of tracer Green's fucntions for ocean inversion project.
370    
371    checkpoint51f_pre
372    o Added on-the-fly spatial interpolation capability
373        "USE_EXF_INTERPOLATION" to pkg/exf.
374      - This is a temporary Cartesian-grid hack until
375        the super-duper ESMF coupler becomes available.
376      - See verification/global_with_exf/README for usage example.
377      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
378        flags and modified pkg/seaice accordingly.
379    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
380        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
381        non-local transport term.
382    
383    checkpoint51e_post
384    o pkg/mom_vecinv:
385      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
386      - add time-ave diagnostic of vorticity advection.
387    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
388    o atmospheric geopotential: - include water vapor effect;
389                                - use p^kappa in p* scaling.
390    o land pkg: read initial state from files.
391    o AIM : add stratospheric drag in the upper level
392    
393    checkpoint51d_post
394    o change function ILNBLNK (=> last non-blank char.) to return zero
395      (instead of the string length) when the string. char is empty
396    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
397    o modif's to restore TAMC compatibility
398      - avoid "_d" constructs in PARAMETER declarations
399      - avoid interrupting lines by comment lines
400    o Use cluster local disks for purely local I/O
401      vs. globally visible disks needed for ctrl stuff
402      (merged from ecco-branch)
403      - new active_file_loc... and mdsio_..._loc routines
404      - affected packages: autodiff, ctrl, grdchk, mdsio
405    
406    checkpoint51c_post
407    o introducing integer flag debugLevel
408      - debLevZero: suppress all output
409      - debLevA: standard
410      - debLevB: equivalent to current debugMode=.TRUE.
411    o introducing pathname variable mdsioLocalDir for mdsio
412      that can be specified at runtime
413      (relevant for cluster I/O to local disk)
414    `
415    >>>checkpoint51b_post
416    adjoint of ptracers
417    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
418    o extended state in checkpoint_lev?, etc.
419    o alternative ctrl/cost with tr1 or ptracer
420    o new comlev1_bibj_ptracers
421    o new ptracers.flow
422    o made ptracers_forcing same as external_forcing_s
423    o added verification for adjoint with ptracers
424      - adm. grdchk fail so far
425      - tlm. grdchk OK
426      - checked tapelev/comlev recomputations: OK
427    <<<checkpoint51b_pre
428    
429    checkpoint51a_post
430    o added code for biogeochemistry package
431      - new pkgs: dic, gchem
432      - new subroutine in ptracers
433    o modify code for biogeo packages
434      - in model/src and pkg/ptracers
435    
436    checkpoint51
437    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
438      - autodiff, ctrl, exf, grdchk, seaice
439      kept separate packages
440      - cost, ecco, obcs
441    o updating verification/internal_wave, verification/lab_sea
442      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
443    
444    checkpoint50i_post
445    o Preparing next differentiable checkpoint and sync
446      of MAIN vs. ecco-branch
447      - 1st step: this one is differentiable
448      - 2nd step: next(! not this) checkpoint will have updated packages
449                  from ecco-branch)
450    
451    checkpoint50h_post
452    o new package "land": provide surface BC for AIM.
453    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
454    o AIM: use true log-P extrapolation for near surface temp (= as in
455        F.Molteni paper) ; update aim.5l_cs output.
456    o New variable in PARM03 for more flexible pickups
457    o somewhat cleaned package initialisation sequence for
458      ctrl/ cost/ ecco/ in packages_... routines
459    
460    checkpoint50g_post
461    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
462      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
463      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
464        made the default because of faster convergence than ADI
465    
466    checkpoint50f_post
467    o exf totally restructured
468      - replaced all exf_set_ routines by one generic exf_set_gen.F
469        and made sure it's still differentiable
470      - split exf_getffields.F into new exf_bulkformulae.F
471      - exf_inscal_/exf_outscal_ suffixes consistent with field names
472      - updated adjoint/makefile and relevant verif. accordingly
473    
474    checkpoint50f_pre
475     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
476          + change Evap over land. (update aim.5l_cs output)
477     o added missing .cvsignores and made uniform across expts
478     o changed configuration of tidal_basin_2d expt
479     o added pkg/debug functions for tracing code in fatal crashes
480     o tidied pkg/monitor to use MONITOR_OPTIONS.h
481     o new fn in pkg/monitor to stop model if solution grows too big
482     o removed lots of single quotes from comments
483    
484    checkpoint50e_post
485    o make KPP work with PTRACERS
486     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
487       nearly a copy of kpp_transport_s
488     - there is no analogue to SurfaceTendencyS, so I have to use
489       gPtr(of the surface layer) instead
490    o add a new platform SunFire+mpi (SunFire 15000) to genmake
491    checkpoint50e_pre
492    
493    checkpoint50d_post
494    o change kpp output from multiple-record state files to single-record state
495      files analogous to write_state.F
496    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
497      analogous to the cg2d-related output.
498    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
499      so that writing to internal file fn (with length 512) fails.
500    checkpoint50d_pre
501    
502    checkpoint50c_post
503    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
504    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
505    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
506    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
507    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
508    
509    checkpoint50c_pre
510    Merging from release1_p13:
511    o bug fix for pkg/seaice dynamic solver
512    o Added SEAICE_initialHEFF to pkg/seaice
513    
514    checkpoint50b_post
515    o store u*,v* in gU,V instead of in guNm1,gvNm1
516    o in order to put the momForcing out of the Adams-Bashforth:
517      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
518      to timestep.F
519    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
520    o re-generate output for highly sensitive test-exp:
521       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
522    
523    checkpoint50b_pre
524    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
525    o corrected CPP option mismatch in exf_Bulk... functions for case
526      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
527    
528    checkpoint50a_post
529    o Bug fix for merging between c50 and KPP.
530      ikey was passed from thermodynamics to kpp_calc via
531      common block rather than being recomputed in kpp_calc,
532      in contradiction with new key itdkey.
533      New key ikppkey created, and tamc.h headers updated.
534    
535    checkpoint50
536    - 2nd step of merge with ecco-branch:
537      merge changes in ecco-branch back into main trunk
538    - bug fix in find_alpha
539    - more storing in gmredi_calc_tensor.F, kpp_routines.F
540    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
541    - merged some sliced AD support routines
542    
543    checkpoint49
544    merged from ecco-branch:
545    o exf:
546      - Enable initialisation of forcing fields to constant
547        (runtime) values.
548      - in exf_getffields.F
549        Reduce i-/j-loop to interior domain, discarding overlaps.
550        That also fixes wrong TAF-key computations for key_1, key_2
551        with bulf formulae.
552      - exf_init.F modify #ifdef for exf_init_evap
553      - exf_getffieldrec.F, ctrl_getrec.F
554        The following INT-usages are not safe:
555          fldsecs  = int(fldsecs/fldperiod)*fldperiod
556          fldcount = int(fldsecs/fldperiod) + 1
557        and were modified.
558    o autodiff: checkpoint_lev...
559      - updated storing for bulk formulae (some arrays were missing)
560      - added state for seaice package
561      - synchronized with main branch
562    o DIVA:
563      Modif.s in
564      - the_main_loop.F
565      - the_model_main.F
566      and added cost_final_restore.F cost_final_store.F
567      o With these changes, it is possible to fully separate
568        the first forward run to compute the cost function (mdthe_main_loop)
569        and adjoint runs over individual DIVA intervals (adthe_main_loop)
570        into separate model executions.
571        This enables better tuning of DIVA to given queue sizes.
572      o Loss of cost function value in consecutive DIVA runs is
573        fixed by storing to 'costfinal' file.
574      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
575        beginning/end of adjoint integration is accounted for.
576      The current changes apply to TAF-1.4.26.
577      TAF has one remaining bug, requiring one manual change
578      (see MITgcm manual).
579    o cal: synchronized between MAIN and ecco-branch
580    
581    checkpoint48i_post
582    o Changes to restore differentiability of code w.r.t. previous tag
583      (mostly adding new routines to make list and replacing
584      pressure by totPhiHyd).
585    o Updated and merged grdchk package
586      - has both ADM and TLM checks
587      - works for single- and multi-proc.
588      - output cleaned
589      - worked successfully for parallel DIVA
590    o genmake:
591      - Adding -platform=SP4
592      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
593    o Modif. for DIVA:
594      ctrl_unpack should not be called in intermediate DIVA interval.
595      (similar thing would apply for active files such as
596      tbar, sbar, psbar, which should not be reinitialised;
597      only relevant for ecco-branch)
598    
599    checkpoint48h_post
600    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
601    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
602    o Added SEAICE_initialHEFF to pkg/seaice
603    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
604    
605    checkpoint48g_post
606    --- EOS:
607    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
608      store total Potential in totPhyHyd for diagnostics & EOS.
609    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
610    --- Pressure/geopotential gradient:
611    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
612    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
613      ( changes results of global_ocean_pressure )
614    o NLFS + z-coord.: add eta*Rho' contribution.
615    o accurate phiHyd when using interface-W at the middle between 2 centers
616     ( changes results of ideal_2D_oce )
617    o includes r* 2nd term in potential gradient.
618    
619    checkpoint48f_post
620    Merging from release1_p12:
621    o Modifications for using pkg/exf with pkg/seaice
622      - improved description of the various forcing configurations
623      - added basic radiation bulk formulae to pkg/exf
624      - units/sign fix for evap computation in exf_getffields.F
625      - updated verification/global_with_exf/results/output.txt
626    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
627      (SBO) core products, including oceanic mass, center-of-mass,
628      angular, and bottom pressure (see pkg/sbo/README.sbo).
629    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
630      to avoid negative values in shallow regions.
631      - updated verification/natl_box/results/output.txt
632      - updated verification/lab_sea/results/output.txt
633    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
634    o Added useSingleCpuIO option (see PARAMS.h).
635    o Updated useSingleCpuIO option in mdsio_writefield.F to
636      work with multi-field files, e.g., for single-file pickup.
637    o pkg/seaice:
638      - bug fix in growth.F: QNET for no shortwave case
639      - added HeffFile for specifying initial sea-ice thickness
640      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
641    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
642      kpp_transport_t.F, forward_step.F, and the_main_loop.F
643    o pkg/seaice:
644      - adjoint-friendly modifications
645      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
646    
647    checkpoint48e_post
648    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
649    o dynamics: change definition of computational domain & adapt mom_fluxform
650      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
651    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
652        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
653        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
654        global_ocean.90x40x15 global_with_exf global_ocean_pressure
655        inverted_barometer solid-body.cs-32x32x1
656      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
657    
658    checkpoint48d_post
659    o in preparation for r*:
660     a) use pre-computed gradient of hydrostatic potential:
661        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
662     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
663        => affects results of glob_oce_pressure (different truncation error)  
664      update output.txt of ideal_2D_oce & global_ocean_pressure
665    
666    checkpoint48d_pre
667    o in preparation for r*:
668      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
669      pass the 2 comp. of the grad. as arguments to momentum S/R.
670      but for the moment, only used if it does not change the results.
671    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
672    
673    checkpoint48c_post
674    Modifications in treatment of initial flux forcing controls
675    to avoid extra storing of flux fields.
676    
677    checkpoint48c_pre
678    o Added tidal_basin_2d experiment (currently 1D!)
679    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
680    
681    checkpoint48b_post
682    o r* coordinate added in #ifdef NONLIN_FRSURF block.
683     (modification to pressure gradient not yet implemented)
684    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
685      (for U & V) that are used for vertical advection of momentum.
686    
687    checkpoint48a_post
688    o In preparation for r*, use temp. array to compute vertical transport
689       in flux-form momentum pkg. => change results of few test-exp.
690      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
691                        lab_sea, natl_box & plume_on_slope
692    
693    checkpoint48
694    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
695    
696    checkpoint47j_post
697    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
698    o moved adexch from forward_step to addummy_in_stepping
699    o added exch in ctrl_map_...
700    o aveFreq.=0. at end of cost_final to avoid overwrite in
701      reverse checkpointing loop
702    o Yet more changes in gmredi:
703      * adgmredi_calc_tensor
704        avoiding all recomputation of gmredi_slope_limit
705      * adgmredi_x/y/rtransport
706        added flag for excessive storing to avoid recomp. of
707        u/v/rtans, dTdx/y/z
708        -> this is not really necessary and very memory-consuming
709      * adgmredi_slope_psi:
710        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
711      * gmredi_slope_limit
712        re-activated full calculation of taperfct for case 'ac02'
713    o updating verification/ adjoints of carbon, global_ocean.90x40x15
714    
715    checkpoint47i_post
716    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
717    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
718      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
719    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
720    o gmredi: fix few bugs.
721    
722    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
723    This will be a good checkpoint to plug into the ecco-branch.
724    o few modif.'s to get latest version adjointed
725      (mainly kick out code in ini_linear_phisurf)
726    o modif's to run adjoint with exactConserv
727    o case GM_BOLUS_ADVEC should be cleaned
728      S/R gmredi_slope_psi should be cleaned
729    o verification/carbon now has exactConserv=.TRUE.
730    
731    checkpoint47g_post
732    o time-average AIM output: becomes independent from statvars time-average
733      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
734    o After TAF bug fix:
735      Tested adjoint of gmredi package.
736      Tests were done with checkpoint47 rather than with latest
737      checkpoint47f_post since the latter is broken for the adjoint
738      verification/carbon/ contains both ADM and TLM gradient checks.
739    Here they are, before they get changed/lost/stolen.
740    Mostly modif.'s to fix numerical sensitivities.
741    Gradient checks OK for
742    - GM_taper_scheme:
743      * clipping
744      * ac02
745      * linear
746      * glw91
747      * dm95
748      * ldd97
749    - GMREDI_OPTIONS:
750      * GM_VISBECK_VARIABLE_K
751      * GM_NON_UNITY_DIAGONAL
752      * GM_EXTRA_DIAGONAL
753      * GM_BOLUS_ADVEC
754    in conjunction with data.gmredi parameters to be checked in
755    in a few minutes under verification/carbon/code/
756    
757    checkpoint47f_post
758    Merging from release1_p10:
759    o modifications for using pkg/exf with pkg/seaice
760      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
761        and SEAICE_EXTERNAL_FLUXES
762      - pkg/exf CPP options EXF_READ_EVAP and
763        EXF_NO_BULK_COMPUTATIONS
764      - usage examples are Experiments 8 and 9 in
765        verification/lab_sea/README
766      - verification/lab_sea default experiment now uses
767        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
768    
769    checkpoint47e_post
770    o created a tag prior to creating a branch
771    
772    checkpoint47d_post
773    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
774      at the bottom boundary had an erroneous half slip boundary condition
775    o added bottom drag and no slip boundary condition capabilities to
776      oceanic pressure coordinates code
777    o added new verification experiment global_ocean_pressure, this experiment is
778      also described in the tutorial section of the manual
779    checkpoint47d_pre
780    
781    checkpoint47c_post
782    o Added a verification experiment for a global cubed-sphere ocean run
783      -  verification/global_ocean.cubed32x32x30
784      -  uses pkg/therm_seaice and pkg/bulk_forcing
785    
786    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
787    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
788      when using P-coordinate; only implemented for atmospheric config.
789    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
790      NOTES: requires option NONLIN_FRSURF to be "#define".
791    o update advect_xz/results/output.txt (left from checkpoint44g_post)
792    
793    checkpoint47b_post
794    Merging from release1_p9:
795    o pkg/seaice
796      - removed GOTO's and added taf directives
797      - double precision constants to reduce the g77 (Linux)
798        to F77 (SGI) differences reported in release1_p8
799    o tools/genmake
800      - added SGI options
801    o verification/testscript
802      - updated to that of checkpoint47a_post
803    o verification/global_ocean.90x40x15/input/eedata
804      - modified for SGI f77 compatibility
805    o verification/lab_sea
806      - added description of sea-ice model
807      - added missing matlab routines
808      - added test of thermodynamics parallelization
809    
810    checkpoint47a_post
811    o new pkg: aim_v23
812     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
813       for now, keep the same surface forcing as before.
814     - Part-Cell implemented into AIM; check that Heat & Water are conserved
815     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
816     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
817    o add diagnostic of surface correction term in monitor output
818    
819    o bulk_force and therm_seaice
820    - Two packages:  bulk_force (Bulk forcing)
821      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
822    - Earlier integration from Stephaine Dutkiewicz
823      and Patrick Heimbach.
824    - Two ifdef statements for compile time,
825       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
826    
827    checkpoint47
828    differentiable version of checkpoint46n_post
829    o bug fix in quasihydrostaticterms
830    o * "clean" adjoint code (in terms of extensive recomputations)
831        can now be obtained for all GMREDI options (i.e. for
832        - GM_VISBECK_VARIABLE_K
833        - GM_NON_UNITY_DIAGONAL
834        - GM_EXTRA_DIAGONAL
835        - GM_BOLUS_ADVEC )
836      * However, wrong gradient check problem remains unsolved.
837      * New CPP options have been introduced for different
838        tapering schemes
839    o external_fields_load now part of differentiation list
840    o pressure needs multiple storing;
841      would be nice to have store_pressure at beginning or
842      end of forward_step, e.g. by having phiHyd global (5-dim.)
843      (NB: pressure is needed for certain cases in find_rho,
844      which is also invoked through convective_adjustment).
845    o recomputations in find_rho for cases
846     'JMD95'/'UNESCO' or 'MDJWF' are OK.
847    o #define ATMOSPHERIC_LOADING should be differentiable
848    o ini_forcing shifted to begining of initialise_varia
849    o Incorporating QNVS line search routines into MITgcm
850      (this is separate code, and therefore not under pkg)
851      lsopt/, optim/
852    o Updated verification/carbon/
853      - #define GM_VISBECK_VARIABLE_K
854      - GM_taper_scheme    = 'ldd97'    
855    
856    checkpoint46n_post
857    Merging from release1_p8:
858    o verification/natl_box:
859      updating new external_fields_load routine
860    o New package: pkg/seaice
861      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
862      The sea-ice code is based on Hibler (1979-1980).
863      Two sea-ice dynamic solvers, ADI and LSR, are included.
864      In addition to computing prognostic sea-ice variables and diagnosing
865      the forcing/external data fields that drive the ocean model,
866      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
867      The implied surface heat flux is then stored in variable
868      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
869      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
870      non-local transport term.  Because this call precedes model
871      thermodynamics, temperature under sea-ice may not be "exactly" at
872      the freezing point by the time theta is dumped or time-averaged.
873      N.B.: fairly large differences in accuracy occur across
874            different platforms/compilers; comparison between
875            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
876            generated output gives:
877       T           S           U           V
878      C D M    c        m  s        m  s        m  s        m  s
879      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
880      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
881      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
882    
883      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
884    o GAD:
885      - generated new common blocks to account for call of
886        same gad routines with differing traceridentities
887        (needed to modify tracerIdentity indices in GAD.h)
888      - generated separate common blocks for case useCubedSphereExchange
889        (Department of Futurology)
890      - parameter lists to gmredi_?transport: added tracerIdentity
891      - added new key indices to tamc.h
892    o external_fields_load:
893      - added this routine to TAF list
894      - needed to make some common blocks global and additional storing
895        along the same lines as exf package (checkpoint_lev?_directives.h)
896    o exf:
897      updated external forcing package
898      - bug fixes carried over from ecco-branch
899        (missing OBCS_OPTIONS.h in two routines)
900      - enable easy to use "no forcing".
901      - added exf I/O for atmospheric loading
902      - added exf I/O for runoff data
903      - transfered scaling between exf <-> MITgcm to exf namelist
904    o Adding new verification experiment global_with_exf.
905      This verification experiment is almost identical to the
906      global_ocean.90x40x15 experiment, except that it uses
907      the exf (and cal) package instead of the
908      external_fields_load routine (cf README file).
909    
910    checkpoint46m_post
911    o modified testscript to return -- when there are no lines of "%MON" output
912    o added new flag "quasiHydrostatic" for QH mode
913      and new routine quasihydrostaticterms()
914    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
915      New routine: mom_u_coriolis_nh()
916    o fixed sign of non-hydrostatic metric terms in u and v equations.
917      Depend on correct sign of gravitySign.
918    o added work.pc* to .cvsignore in aim directories using ifc
919    o introduced flag for controllin non-hydrostatic metric terms
920    o removed gravitySign from PARM04
921    o switched to g77/ifc from pgf77 in aim experiments
922    
923    checkpoint46l_post
924    o made convective adjustment work with pressure coordinates:
925     - changed the direction of k-loop in convective_adjustment.F for the
926       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
927     - adjusted the reference pressure k-index in convective_adjustment.F
928     - adjusted the convection condition in convect.F (in analogy to
929       calc_ivdc.F)
930     - convective_adjustment no longer computes anything on the halos
931     - removed the warnings about negative salinity from find_rho.F and
932       find_alpha.F; instead the new routine look_for_neg_salinity, called
933       at the beginning of find_rho, find_alpha, and find_beta, does a
934       check of the entire slice, if CPP-option
935       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
936    checkpoint46l_pre
937    
938    checkpoint46k_post
939    o fixed the verification/global_ocean.90x40x15 experiment:
940     - new bathymetry (the world according to A., JMC, and M.)
941     - new initial fields and forcing fields (*.bin files)
942     - new POLY3.COEFFS (for the next release one should switch to a full
943       equation of state: JMD95P or MDJWF)
944     - fixed several errors and redundancies in the data file
945     - experiment uses looped cells
946     - added matlab directory with diagnostic scripts for plotting of output
947    
948    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
949     - read AIM physics parameters from a file (data.aimphys)
950     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
951    
952    checkpoint46j_post
953    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
954    o move wVel computation at the end of the time step, in S/R integr_continuity
955    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
956    o update timeave pkg for wVel diagnostic.
957    checkpoint46j_pre
958    
959    checkpoint46i_post
960    o Clean up AIM package (and keep the results unchanged):
961      include CPP_OPTION and use IMPLICT NONE in all routines ;
962      declare all the variables _RL ; use _d 0 for all numerical constants.
963      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
964    
965    checkpoint46h_post
966    o cleaned up the use of rhoNil and rhoConst.
967      - rhoNil should only appear in the LINEAR equation of state, everywhere
968        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
969        and the dynamical equations are all divided by rhoConst
970    o introduced new parameter rhoConstFresh, a reference density of fresh
971      water, to remove the fresh water flux's dependence on rhoNil. The default
972      value is 999.8 kg/m^3
973    o cleanup up external_forcing.F and external_forcing_surf.F
974      - can now be used by both OCEANIC and OCEANICP
975    checkpoint46h_pre
976    
977     Added code to convert surface volume flux (fresh water) into
978     a mass flux when using P coordinates in the ocean (OCEANICP).
979     Note: It assumes you have set rho0=rhoConst=density of fresh water.
980    
981    checkpoint46g_post
982    o Include a new diagnostic variable phiHydLow for the ocean model
983      - in z-coordinates, it is the bottom pressure anomaly
984      - in p-coordinates, it is the sea surface elevation
985      - in both cases, these variable have global drift, reflecting the mass
986        drift in z-coordinates and the volume drift in p-coordinates
987      - included time averaging for phiHydLow, be aware of the drift!
988    o depth-dependent computation of Bo_surf for pressure coordinates
989      in the ocean (buoyancyRelation='OCEANICP')
990      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
991        Theta, Salinity, and Pressure in the parameter list. This routine is
992        presently contained in find_rho.F. This routine does not give the
993        correct density for 'POLY3', which would be a z-dependent reference
994        density.
995    o cleaned up find_rho
996      - removed obsolete 'eqn' from the parameter list.
997    o added two new verification experiments: gop and goz
998      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
999    checkpoint46g_pre
1000    
1001    checkpoint46f_post
1002    o Enable tangent linear (forward mode) gradient checks:
1003      - extended active file handling to g_... files
1004      - added TANGENT_SIMULATION to theSimulationMode
1005      - extended grdchk package accordingly
1006    o added tangent linear setup in verification/carbon/code_ftl
1007    o added adjoint setup in verification/front_relax/code_ad
1008    
1009    checkpoint46e_post
1010    o Added new equation of state -> MDJWF
1011      - EOS of McDougall et al., 2002, JAOT, submitted
1012      - caveat: the equation of state is only valid for a smaller (more
1013        realistic?) range of values than JMD95P/Z and UNESCO
1014      - added masks to the calculation of pressure in store_pressure
1015      - added more check values for density in check_eos (ini_eos.F), some of
1016        the old check values are out of the range of the MDJWF-eos, so don't
1017        expect perfect matches for those
1018    checkpoint46e_pre
1019    
1020    checkpoint46d_post
1021    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
1022      'OCEANICP', also initialised field pressure correctly in ini_eos in the
1023      case of pressure coordinates. eosType='JMD95Z' in
1024      combination with buoyancyRelation='OCEANICP' now causes an error.
1025    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1026      in find_alpha/beta.
1027    checkpoint46d_pre
1028    
1029    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1030      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
1031    
1032    checkpoint46c_post
1033    o Changes necessary for ocean in p-coordinates
1034     -  Added new buoyancy relation = 'OCEANICP'
1035     -  Added new parameters = gravitySign (this used to be contained inside
1036        the factor dRdZ which I added when we first switched to R coordinates).
1037     X GM/Redi is not compatible (yet)
1038     X bottom drag and no-slip need to be debugged.
1039    checkpoint46c_pre
1040    
1041    checkpoint46b_post
1042    o Added new equation of state -> JMD95Z and JMD95P
1043      - EOS of Jackett and McDougall, 1995, JAOT
1044      - moved all EOS parameters into EOS.h
1045      - new routines ini_eos.F, store_pressure.F
1046    o Added UNESCO EOS, but not recommended because it requires
1047      in-situ temperature (see JMD95)
1048    o Modified formatting for knudsen2.f in utils/knudsen2 and added
1049      unesco.f to be used with POLY3
1050    checkpoint46b_pre
1051    
1052    checkpoint46a_post
1053    o Added (atmospheric) pressure loading
1054      - new field in FFIELDS.h, etc...
1055      - new cpp flag ATMOSPHERIC_LOADING
1056    o Changed hFacC to _hFacC in calc_phi_hyd.F
1057    o Added SHORTWAVE_HEATING to some files for consistency
1058    checkpoint46a_pre
1059    
1060    checkpoint46
1061    further merges from release1_p5
1062    o new ctrl package
1063      - adopted from ECCO environment to enable optimization
1064      - added Eliassen Palm fluxes to controls
1065    o added Eliassen Palm flux controls to gradient check package
1066    o cost package
1067      - Compatible with new ctrl package
1068      - added Eliassen Palm cost hooks
1069      - modif's of existing cost functions
1070    o Adjoint-related bug fixes in kpp:
1071      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
1072      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
1073    o autodiff package
1074      - flow directives:
1075        + new for S/R do_the_model_io
1076        + enhanced for S/R checkpoint
1077        + new gmredi.flow
1078      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
1079        disable adcommon.h/g_common.h by default.
1080      - fixed problem for adjoint of global_max
1081    o modified verification/carbon/
1082    o New setup for adjoint of global_ocean
1083    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
1084    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
1085    o incorporated hooks for sponge layer code (external_forcing.F)
1086    
1087    checkpoint45d_post
1088    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
1089    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
1090      (affects plume_on_slope "cg2d" output)
1091    o add new parameter deltaTfreesurf for free-surface time stepping
1092    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
1093    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
1094    o change phiMin in exp1 (to agree with documentation)
1095    o add new flags:
1096     - T,S forcing inside/outside Adams-Bashforth
1097     - turn off temp,salt advection and/or forcing
1098     - for each tracer, define internal flag for multiDimAdvection & A-B
1099    o monitor: change definition of KE to check conservation of Energy
1100    
1101    checkpoint45c_post
1102    o Removed f90 comments ("!")
1103    o Modified initialisations to enable exf package for MITgcm
1104      (without invoking ECCO_PACKAGE).
1105    o modifications to gradient check package (Martin Losch)
1106      - enable centered differences
1107      - modified format of standard output
1108    
1109    checkpoint45b_post
1110    o cleaned exchange calls in cg2d
1111    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
1112    o included CPP option SINGLE_LAYER_MODE in thermodynamics
1113      to configure barotropic setup (Martin Losch)
1114    o moved some initialisations within bi,bj loop in dynamics
1115      (TAF flow dependency)
1116    o in initialise_varia, moved call packages_init_variables
1117      before convective_adjustment_init
1118      (corresponding adjustment of TAF tape initialisation).
1119    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
1120    
1121    checkpoint45a_post
1122    o compute Rho over the whole domain (extend iMin,jMin indices)
1123    o specific exchange for X-slice domain (case Ny=1)
1124    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
1125    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
1126    
1127    checkpoint44h_post = checkpoint45
1128    o Fix to restore differentiability:
1129      place at which packages_init_variables is called in
1130      initialise_varia is crucial for reverse control flow.
1131    o modifications in GMRedi to enable stable adjoint
1132      (corresponding modif's in thermodynamics, dynamics)
1133    o added missing hook for sponge layer code in external_forcing
1134    o modified test cost functions
1135    o storing in gad_advection (plus removal of write(0,*)!
1136    o missing headers TR1.h added in convective_adjustment routines
1137    o errorMessageUnit set non-equal zero in eeboot
1138      (conflict on some platforms, e.g. IBM SP3)
1139    o modified carbon verif.
1140    
1141    checkpoint44h_pre
1142    o vertical grid option: allow to put the Interface at the middle between
1143      2 cell-centers ; replace delZ in pkg/kpp by drF.
1144    o GM Advective form: Tracers are advected using the residual transport (=
1145      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
1146    
1147    checkpoint44g_post
1148    o fix surface correction term in multiDimAdvection (affects plume_on_slope
1149      results) ; ifdef missing in thermodynamics.F
1150    
1151    checkpoint44f_pre,checkpoint44f_post
1152    o added PTRACERS package
1153      This allows an arbitrary number of passive tracers to be integrated
1154      forward simultaneously with the dynamicaly model.
1155      + Implemented so far:
1156        - basic forward algorithm (time-stepping, advection, diffusion, convection)
1157        - I/O and checkpointing
1158        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
1159      + Not implemented so far:
1160        - KPP
1161        - OBCS
1162      + No specific example supplied (yet) but global_ocean.90x40x15 has the
1163        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
1164        line in data.pkg.
1165      + This package is disabled by default since it increases storage.
1166    
1167    
1168    o testscript: added -cleanup option
1169    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
1170                 b) enable to filter 2D fields.
1171    
1172    checkpoint44e_pre,post
1173    o re-wrote convective adjustment to use pre-calculated weights
1174      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
1175      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
1176      Original calls to convect() still in place.
1177    
1178    chkpt44d_pre,post
1179    o added missing EXCLUDE_MONITOR flags
1180    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
1181      (incompatible typ in MIN/MAX expressions caused problems
1182      on IBM SP3)
1183    o in genmake added variable MAKEDEPEND
1184      plus resetting for case SunOS
1185    o added timer_stats.c routine for IBM SP3
1186    o removed variables in dynamics
1187    !!! I forgot to create tag chkpt44d_pre !!!
1188    !!! But chkpt44d_pre = chkpt44c_post    !!!
1189    
1190    o real fresh water flux implemented with non-linear free-surface.
1191    
1192    chkpt44c_pre,post
1193    o few fix (mask in shap_s2, EmPmR in external_field_load,
1194      USE_NATURAL_BCS in solve_for_P);
1195    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
1196    
1197    checkpoint44b_pre/_post
1198    o merge of relevant stuff from the ecco-branch:
1199      - genmake: removed $S64 overwrite for case SunOS
1200      - pkg/exf: update and corrections for field swapping and obcs
1201      - pkg/ecco: parameter lists for the_model_main, the_main_loop
1202                  harmonized between ECCO and MITgcm
1203      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
1204                      updated checkpointing_lev... lists for obcs
1205      - model/src: minor changes in forward_step, plot_field
1206                   added directive for divided adjoint in the_main_loop
1207      - pkg/mdsio: added mdsio_gl_slice
1208    
1209    o check parameters & config (chkpt44a_pre,post)
1210    o OBC and NonLin_FrSurf.
1211    
1212    checkpoint44
1213    o fix bug in mom_vi_del2uv
1214    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
1215    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
1216    o update AIM experiments (NCEP input files)
1217    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
1218    o added some stuff for AD
1219    
1220    checkpoint43
1221    o added two new advection tests
1222    o added global 4x4 degree ocean test
1223    o added test of H&S94 with free surface on cube
1224    o some final mods for gradient check, adjoint,...
1225    
1226    checkpoint42
1227      Fixed AD-related problems:
1228    o Store directives up-to-date with re-arranged Adams-Bashforth
1229      (mainly thermodynamics.F)
1230    o New store directives for multi-dim. advection schemes
1231      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
1232      * new common block and key passkey
1233      (mainly gad_advection.F)
1234    o Modified store directives for split of dynamics/thermodynamics
1235      for the case ALLOW_KPP
1236    o Cleaned argument list for timestep_tracer.F
1237    
1238    checkpoint41
1239    o re-formatted/added comments in prologues of key subroutines
1240      to work with protex
1241    
1242    checkpoint40
1243    o moved calc_gs, calc_gt and calc_tr1 back to model/src
1244    o added FLT (floats) package from Arne along with demo. experiment
1245    o re-arranged Adams-Bashforth scheme for tracers to allow easier
1246      implementation of forward-in-time forcing terms
1247    o more mods for non-linear free-surface including new variable
1248    o modified multi-dim method to work on cube
1249    o bug fix in KPP (from DM)
1250    
1251    checkpoint40pre9
1252    o added DST advection schemes
1253    o fix MPI bug on SGI's
1254    o modifications for non-linear free-surface
1255    o fixed conditionals for fixed flow/passive tracer only mode
1256    o added tension/strain form of stress tensor
1257    o changes to commenting of arguments for TAF/TAMC
1258    o added/updated many matlab scripts
1259    o added multi-dimensional advection method for tracers
1260      
1261    checkpoint40pre8
1262    o new package rw/
1263      Added method for dumping intermediate local arrays:
1264      mdsio_writetile - same as mdsio_writefield except works from inside
1265                        bi,bj loop
1266      mdsio_writelocal - same as mdsio_writetile except works for local
1267                         arrays
1268      write_local_r? - higher-level wrapper for mdsio_writelocal
1269      Controlled by diagFreq. Defaults to zero (ie. no dumps)
1270      Example given at end of mom_vecinv.F that dumps some local arrays.
1271    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
1272      control flux-form versus vector invariant code.
1273      Switch is runtime flag vectorInvariantMomentum (defaults to false)
1274      or genmake -DISABLE ...
1275    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
1276      (additional storing is now needed for case vecinv;
1277      currently nothing implemented to switch this storing off
1278      in case fluxform is used since no CPP flag available).
1279    
1280    checkpoint40pre7
1281    o bug fix in dynamics.F
1282      calc_viscosity called before k=1,Nr loop.
1283    o added some #ifdef's ALLOW_PASSIVE_TRACER
1284    o cleaned initialisations in ctrl_map_ini
1285      related to TAF
1286    
1287    checkpoint40pre6
1288    o split dynamics into thermodynamics & dynamics
1289    o corresponding split of calc_diffusivity into
1290      calc_diffusivity, calc_viscosity
1291      (kpp_calc_diff, kpp_calc_visc).
1292    o Added diffkr, kapgm to control variables
1293    o bug fix in gmredi_slope_limit for ldd97
1294    
1295    checkpoint40pre5
1296    o proper initialization of Adams-Bashforth time stepping
1297      + uses forward step for very first step of model (iter=0)
1298    o re-generated *all* output since almost all output is modified by this
1299      change (sorry but we've been putting this one off for about 2 years)
1300      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
1301        *not* regenerated since they are already out of date and I don't
1302        want to create the impression that they are suddenly working.
1303    o removed KAP stuff for DEC's
1304    o modified/added many .cvsignore files in */code and */input
1305    o added new expt "solid-body.cs-32x32x1"
1306      + this uses an alternative form of ini_curvilinear_grid.F which
1307        is not necessarily any better than the current one...
1308    
1309    checkpoint40pre4
1310    o added re-initialisations of utrans,vtrans,rtrans in
1311      calc_common_factors which are crucial for TAF.
1312    o extended iMin,jMin range for calc_common_factors,
1313      calc_diffusivity
1314    o added option ALLOW_PASSIVE_TRACER
1315    o a few minor updates and fixes
1316    
1317    checkpoint40pre3
1318    o created calc_gtr1.F for gad package
1319    o split the_main_loop and re-introduced forward_step
1320    o some recomputations of nIter0 for TAMC
1321    
1322    checkpoint40pre2
1323    o Updated to latest branch of AJA, JMC
1324    o Added gradient check package
1325    o Added routines for passive tracer handling
1326    o Added carbon sequestration sensitivity experiment
1327    
1328    checkpoint39
1329     o Modifications and fixes to support TAMC
1330       (mainly missing or wrong directives)
1331     o Corrected common blocks when fooling TAMC to produce adjoint I/O
1332       in addummy_in_stepping
1333     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
1334     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
1335     o Included following packages:
1336       cal: calendar
1337       exf: external forcing
1338       ecco: essential routines to control use of cal, exf
1339             (NB: this is not the full ECCO environment)
1340     o disabled some packages by default in genmake
1341    
1342    checkpoint38
1343     o see notes_c37_adj.txt
1344     o corrected wrong layer index in external_forcing_t
1345     o replaced the_main_loop/forward_step by the_main_loop
1346     o removed forceoutput from write_state
1347       (replaced criteria for initial/final state)
1348     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
1349    
1350    checkpoint37
1351     o mdsio.F routine split and packaged in pkg/mdsio
1352       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
1353        used unless genmake -disable=mdsio)
1354     o allow a more precise surface-geopotential gradient for the atmosphere
1355       taking into account the change in space of Alpha (=1/rho) at the surface.
1356     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
1357       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
1358     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
1359       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
1360       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
1361     o Time-Average diagnostics defined as a pseudo package "timeave".
1362     o pickup files : old pickup (before c35) did not work with new code (c35
1363       and after) unless activating 2 commented lines in initialise-varia.
1364     o Non-Hydrostatic pickup file Pb fixed.
1365     o bug with Rigid-lid version (since c35) fixed.  
1366    
1367    checkpoint36
1368     o implement Crank-Nickelson barotropic time-stepping
1369     o recover Time-Average diagnostics
1370     o fix Pb in checkpoint (PR#19)
1371     o AIM become a standard package ; clean unused CPP_kees
1372    
1373    checkpoint35
1374     o subtantial rewrite of dynamics.f
1375     o allows staggered time-stepping
1376     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
1377     o added bottom drag (linear + quadratic)
1378    
1379    checkpoint34
1380     o Modified exchange routines for correct reverse simulation.
1381     o Added verification output to comply with bug fix in impldiff.F
1382       as of c33 (exp2, natl_box).
1383     o Corrected store directives in dynamics.F
1384     o Corrected array boundaries in impldiff.F
1385     o Corrected array dimensions in gmredi.
1386       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
1387     o Added routine GLOBAL_SUM_INT to global_sum.F
1388     o Added mdsio_gl.F for ECCO purposes.
1389    
1390    checkpoint33
1391     o Fixed bug in lower BC in impldiff.F
1392     o Fixed confusion about units of forcing arrays in FFIELDS.h
1393       namely Fu,Fv,Qnet,Qsw,EmPmR:
1394       - Removed verification/natl_box/code/external_fields_scale.F
1395         (did not differ from that in model/src)
1396       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
1397         (see FFIELDS.h for description)
1398       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
1399         kpp_calc.F and kpp_transport_t.F
1400       - Removed model/src/external_fields_scale.F and calls to it
1401       - verification/natl_box uses flux data with "atmospheric" sign so
1402         a special version of external_fields_load.F is used to
1403         change the data as it's read in. This way, the arrays
1404         have the right units and signs at all times tha a user could
1405         possibly use them.
1406     o Corrected genmake to delete a temporary file during configuration
1407    
1408    checkpoint32
1409     o Scaling of forcing fields moved from external_forcing.F to
1410       external_fields_scale.F, called directly after loading fields.
1411     o Surface relaxation terms added to surface tendency fields in
1412       extra subroutine.
1413     o impldiff.F changed to avoid storing by TAMC of huge intermediate
1414       fields.
1415     o Changes in GMRedi to comply with packaging structure.
1416     o Modifications and bug fixes in KPP package.
1417     o Verification experiment for KPP added (verification/nat_box/)
1418    
1419    checkpoint31
1420     o Packages interface brought in line with defined standard
1421       -> new routines packages_...F
1422       -> changes in initialise_fixed.F, initialise_varia.F
1423       -> enables initialisation interface for ECCO package
1424     o Rescaling of external forcing fields immediately after read
1425       (removed from external_forcing.F)
1426       -> new: surface_fields_scale.F
1427       -> affects ini_foorcing.F, external_fields_load.F
1428     o Computation of surface tendencies before tendency updates.
1429       -> new: external_forcing_surf.F
1430     o Change of variable names useGMRedi, useKPP, useECCO
1431     o Further changes in dynamics.F, impldiff.F for TAMC
1432     o Tested for experiments 0, 2, 4.
1433       - not yet tested for GMRedi.
1434       - not yet tested for KPP.
1435    
1436    checkpoint30
1437     o Updates for OBCs
1438     o New experiment for test OBCs (internal_wave)
1439     o New output.txt in verification/exp4/results/
1440     o Updates for KPP: calculation of viscosity corrected, new variables
1441       kpp_dumpFreq and kpp_taveFreq
1442     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
1443       and entry for T90 in genmake
1444    
1445    checkpoint29
1446     o packaged KPP and GM/Redi
1447    
1448    checkpoint28
1449     o Corrected initialization of hFacMin for difference vertical coordinates
1450     o Modified calculation of partial cell thickness to more robust algorithm
1451     o config_summary.F: replaced write_1D_... by write_0D_...
1452       read_write.F: added subroutines write_0D_...
1453     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
1454       included some initialisations required for TAMC.
1455     o routine calc_isoslopes: modified sqrt computation to make it
1456       differentiable for zero argument.
1457     o routines dynamics, impldiff:
1458       included store directives and tape key computations required for TAMC.
1459     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
1460    
1461    checkpoint27
1462     o fixed calc_isoslopes() to so that cancellation of terms in tensor
1463       formulation works properly with variable resolution.
1464     o restructured the calling tree between the_model_main() and dynamics()
1465     o split initialise() into initialise_fixed() and initialise_varia()
1466     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
1467       in new routine ini_psurf()
1468    
1469    checkpoint26
1470     o moved some #ifdef in optional routines to encompass everything
1471       except the argument declarations. This was using up some memory.
1472     o fixed macros like _ADT to work with both versions of Linux cpp
1473     o cleaned up some unused and uninitialized variables
1474       (helps when debugging with strict compile options)
1475     o split up CPP_EEOPTIONS.h into options and macros
1476       (macros are now in eesupp/inc/CPP_EEMACROS.h)
1477     o patch for 2 processor JAM mode
1478    
1479    checkpoint25
1480     o updates for OBCs and NH
1481     o dramatically reduced memory usage
1482     o added "JAM" routines for use on Artic network
1483     o parameterization of convection by implicit vertical diffusion
1484     o added a diagnostic of convective index
1485     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
1486       (this is was partly for OBCs and NH but also in anticipation of
1487        an explicit free-surface option)
1488     o initial state input files for U and V
1489    
1490    checkpoint24
1491     o Removed some spurious "REAL"s
1492     o Updated KPP to latest version from JPL
1493     o Added a COS(latitude) in horizontal viscosity
1494    
1495    checkpoint23
1496     o Added del^4 diffusion for salt and temperature
1497     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
1498    
1499    checkpoint22
1500     o Made many small changes: implicit none, format(i5), etc...
1501     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
1502    
1503    checkpoint21
1504     o Introduced new I/O package that supports direct-access records (mdsio.F)
1505     o Split-up mid-level I/O routines
1506     o Updated input data for experiments 0,1,2,4 and 5
1507     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
1508    
1509    checkpoint20
1510     o Tidied up open-boundaries some more
1511     o Added non-hydrostatic code
1512     o Fixed some input data
1513     o Modified MPI start-up to work in "coupled" context.
1514    
1515    checkpoint19
1516     o Tidied up directory structure for verification experiments.
1517     o Added new code for open boundaries.
1518     o Corrected advective terms near boundaries.
1519     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
1520     o Implemented free-slip/no-slip BCs and del^4 dissipation.
1521     o Split default parameters out of ini_parms.F into set_defaults.F.
1522    
1523    checkpoint18
1524     o Further changes for optional code generation with
1525       CPP - ugh!
1526    
1527  checkpoint17  checkpoint17
1528   o Beginning to incorporating modularity   o Beginning to incorporating modularity

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