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revision 1.1442 by gforget, Wed May 25 23:56:29 2011 UTC revision 1.1512 by jmc, Wed Oct 12 03:05:43 2011 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o pkg/exf:
8      - fix previous modif in exf_readparms.F (revision 1.66: treatment of
9        optional namelist EXF_NML_OBCS).
10      - add many debug-print (to trace down where pkg/cal error msg comes from)
11    o pkg/mom_vecinv/mom_vi_hdissip.F
12      - rearrange loops so that vectorization is improved and in particular
13        the adjoint routine vectorizes. The code is a little longer now, but I
14        think easier to read.
15        Note: CPP-flag MOM_VI_ORIGINAL_VISCA4 is not tested.
16  o pkg/seaice:  o pkg/seaice:
17   - seaice_growth.F : in EVOLUTION branch, always include    - allow to specify initial seaice velocity from files (uIceFile,vIceFile)
18    o pkg/exch2:
19      - alternative code (without tile x tile matrix) for cumulated (global) sum;
20        used as default; keep using matrix version in adjustment.cs-32x32x1.
21    o tools/build_options:
22      - after merging some MPI and/or multi-threads specific optfiles so that
23        the modified default optfile support both built (using genmake2 -mpi
24        for the MPI built, using genmake2 -omp for OpenMP built),
25        move now obsolete optfiles to tools/build_options/unsupported/
26       (add copy of email sent to support list in doc/optfiles_changes.txt)
27    
28    checkpoint63c (2011/09/28)
29    o pkg/ebm:
30      - fix ebm_zonalmean.F for several procs in Ydir (nPy > 1); update output of
31        test exp. global_ocean_ebm (affects machine truncation, 12 digits for cg2d)
32    o pkg/seaice (SItracer pickup)
33    * Simple code for pickup of SItracer fields (#define ALLOW_SITRACER)
34      To be done:
35      - thorough testing of missing fields in S/R seaice_read_pickup
36      - thorough matching between generic tracers and specific fields used
37        (e.g. volume-weighted age, area-weighted age, salinity, ...)
38    o pkg/grdchk:
39      - all procs calculate and print finite-difference gradient (for testreport)
40      - change description output used by testreport;
41      - AD testing: also compare and report Finite-difference gradient;
42        => update all output_adm*.txt
43    o test exp. global_ocean_ebm:
44      - switch back useRealFreshWaterFlux (no problem anymore with run-off);
45        and turn on exactConserve; update (fwd) output.
46    o pkg/seaice (LSR):
47      - print to STDOUT number of solver iterations at SEAICE_monFreq interval.
48      - modify solver to deal cleanly with u/v switch at face edges (CS-grid):
49        * identical results with non-CS topology (but save up to half of EXCH calls)
50        * no much changes in cs-32 verification tests since no ice at face edges
51         (differences due to convergence criteria, since nb of iterations changed)
52        * expect some differences on lat-lon-cap grid.
53        update FWD results of global_ocean.cs32x15 test exp. (icedyn & seaice)
54    o pkg/exch2:
55      - add new CPP option to disable Cumul-Sum matrix (to save storage when using
56        many tiles); until alternative coding is added, just add a stop.
57    o pkg/kpp:
58      - move ptracer/salt correction to KPP diffusivity from calc_3d_diffusivity.F
59        to S/R KPP_CALC_DIFF_PTR (+ add tracer-index to argument list).
60    o optfiles:
61      - merged few MPI specific (*+mpi*) and multi-threads specific (*+mth) optfiles
62        into corresponding standard one, which now support different build:
63        (when using "genmake2 -mpi" for MPI built, "genmake2 -omp" for OpenMP built)
64      - add "darwin_amd64_gfortran" optfile (initially from Constantinos, tested by Gael)
65    o pkg/obcs (seaice):
66      - add missing EXCH for uIce,vIce after applying OBCS;
67      - remove S/R EXF_SWAPFFIELDS_X/Y , disable S/R EXF_SET_OBCS_X/Y by adding
68        argument = number of levels to S/R EXF_SWAPFFIELDS_XZ/YZ and S/R
69        EXF_SET_OBCS_XZ/YZ ; update obcs_exf_load.F;
70      - fix EXF_SET_OBCS_XZ/YZ for multi-threaded (assuming loaded arrays are shared)
71      - verification exp. seaice_obcs: split domain in 2 tiles ; add SIZE.h_mpi
72        and eedata.mth for MPI and mutlti-threaded testing.
73    o pkg/flt:
74      - make FLT EXCH working with multi-threads (and MPI + multi-threads);
75      - use buffer for floats IO (trajectories & profiles); size set in FLT_SIZE.h;
76      - fix pickup and trajectories + profiles output with multi-threads;
77      - add parameter to select group of fields to write along trajectory and
78        profile (default unchanged);
79      - only call PORT_RAND* function when flt_noise <> 0;
80      - add multi-threaded test for verification exp. flt_example.
81    o eesupp/src:
82      - fix S/R ALL_PROC_DIE for MPI+multi-threads.
83      - USE_OMP_THREADING: check that number of threads (from eedata) matches
84        actual number (from env.var. setting).
85    o pkg/ebm:
86      - fix multi-threading in ebm_area_t.F ; clean-up EBM.h header file.
87      - add multi-threaded test for verification exp. global_ocean_ebm
88    
89    checkpoint63b (2011/08/29)
90    o pkg/ebm:
91      - fix sign of runoff;
92      - update directly forcing fields (Qnet,EmPmR) to use standard
93        external_forcing_surf.F (remove ebm_forcing_surf.F);
94      - avoid loading forcing fields a 2nd time (1rst time from ini_forcing.F);
95      - set either tauThetaClimRelax (in data) or tauThetaZonRelax (in data.ebm)
96        and apply relaxation towards corresponding SST field (2-D map or ZonAver).
97      - update global_ocean_ebm parameters file data and update output (fwd+ad).
98    o verification/matrix_example:
99      - split domain in 8 tiles (2x4); add SIZE.h_mpi and eedata.mth for
100        MPI and mutlti-threaded testing.
101    o pkg/matrix:
102      - change name of S/R MATRIX_INIT to S/R MATRIX_INIT_VARIA ;
103      - fix for multi-tiles (add bi,bj indices to exp/impMatrixCounter);
104      - fix for multi-threaded (remove DATA statement);
105      - use standard DIFFERENT_MULTIPLE function;
106      - add MATRIX_OPTIONS.h
107    o verification/matrix_example:
108       To allow to split the domain in several tiles, change the domain size
109        from 31x31 to 32x32 by adding 1 row (on Southern side) + 1 column (on
110        Western side) of land points.
111    o (*_)write_pickup:
112      - fix few bugs in mypackage_read/write_pickup.F
113      - in MDS_WR_METAFILES calls, replace "myTime" by a local copy into
114        array of length 1 (was caught by compiler syntax-check).
115    o pkg/diagnostics (velocity potential solver):
116      - fix initialisation of main diagonal matrix (for overlap values)
117    o tools/build_options:
118      - towards single optfile for MPI and non-MPI built: merge few +mpi optfile
119        into previously non MPI one (linux_am64 pgf77,open64,pathf90,ifort11)
120      - linux_amd64_gfortran: merge +mpi_generic version into standard optfile:
121        * move IEEE flags to DEVEL section; take IEEE flags from +mpi_generic ;
122        * FAST case: for now, keep -O3 with ini_masks_etc.F in NOOPTFILES list;
123        and use "-devel" testreport option for standard testing on baudelaire.
124    o pkg/grdchk:
125      - Assume that all gradient-check position are within the same tile
126        corresponding to global indices (iGloTile,jGloTile) and that
127        positions (i,j indices or nbeg) are local to this tile;
128      - set tile local-indices and proc. number according to tile global-indices;
129      - remove grdchkwhichproc from namelist (retired param);
130      - send adjoint gradient to all procs so that all procs print it to STDOUT;
131      - switch on MPI test for global_ocean.90x40x15 AD test experiment.
132    o adding package bbl (Bottom Boundary Layer)
133      description in MITgcm/pkg/bbl/bbl_description.tex
134      example/test experiment in MITgcm_contrib/bbl
135    o adjoint verifications
136      - changed 5 experiments to multi-tiles
137        * global_ocean.90x40x15
138        * obcs_ctrl
139        * offline_exf_seaice
140        * tutorial_dic_adjoffline
141        * tutorial_tracer_adjsens
142        changed reference output for those that crossed tile boundaries
143        (changed choices of gradient check positions)
144      - with same tiling, switch on MPI test for the last 4 (add SIZE.h_mpi)
145      - temporary bug fix in grdchk_loc.F for obcs
146    o genmake2 & testreport
147      - add target "obj" (just for OBJFILES files) to Makefile;
148      - add option to specify FEXTRAFLAGS on command line.
149    o pkg/mypackage:
150      - remove bi,bj arguments from argument list of S/R MYPACKAGE_CALC_RHS
151    
152    checkpoint63a (2011/08/02)
153    o pkg/diagnostics (velocity potential):
154      - fix velocity-potential calculation when using OBCS: balance net inflow
155        at each level (new S/R OBCS_DIAG_BALANCE).
156      - fix some of the problems with OBCS in stream-function calculation.
157    o pkg/exf/exf_readparms.F
158      - make treatment of optional namelists (EXF_NML_04, EXF_NML_SGRUNOFF,
159        EXF_NML_OBCS) more consistent, so that you need not have these lists
160        in data.exf when they are not used.
161    o optim/optim_readdata.F:
162      - add some output about obcs variables that might help debugging
163      - add a check about nvarlength
164    o pkg/ctrl: once again, fix computation of endrec in s/r ctrl_init_rec
165    o pkg/diagnostics (velocity potential):
166      - fix mask for OBCS (still problems in stream-function with OBCS);
167      - add specific parameter (default = main code CG2D params) for solver;
168      - in case of poor convergence, use solution corresponding to lowest residual.
169    o pkg/seaice/seaice_growth.F: small changes that permit vectorizable
170      adjoint code. In general statements like tmpscal=fld(i,j) are problematic
171      and should be avoided where possible.
172    o model/src (rStar):
173      - include r* effect on reference-state (PhiRef) in totPhiHyd
174        (so that it's really the potential anomaly at the cell center);
175        affect solution only if z* with full pressure in EOS.
176      - test-exp global_ocean.90x40x15: reduce viscA4 (was not stable) and
177        update output (because of z* in totPhiHyd and viscA4 changes);
178      - keep the previous diagnostics as "PHIHYDcR" (closer to potential anomaly
179        @ constant r) until interpolation at constant r is implemented.
180    o pkg/diagnostics
181      - fix RCENTER diagnostics in case cell center is not at interface middle
182    o add code for TEOS-10 (www.teos-10.org, McDougall et al. 2011). Use
183      this eos with eosType = 'TEOS10', in data (PARM01). This eos implies
184      that THETA and SALT are "conservative temperature" and "absolute
185      salinity"
186    o pkg/ctrl
187      - fix computation of endrec in s/r ctrl_init_rec
188      - ctrl_pack/unpack_*: remove unused variables and some obsolete code
189    o pkg/seaice/seaice_growth.F
190      - fix recomputation with FENTY_AREA_EXPANSION_CONTRACTION code,
191        remove then obsolete STORE directives
192      - fix STORE directives for tice and tices, so that only the
193        appropriate part of the fields are stored (and not the entire
194        field); update global_ocean.cs32x15.seaice AD output.
195      - cosmetic changes: adjust CPP flags and indentation for better
196        legibilty
197    o pkg/autodiff: add mnc-output of adBottomDragFld (code contributed by
198      Chris Wilson)
199    o pkg/gmredi:
200       Add Sub-Meso Eddies parameterisation from Baylor (for now, disabled with TAF),
201       and test it in verification exp. "front_relax.bvp" (update output.bvp.txt)
202    
203    checkpoint63  (2011/07/11)
204    o pkg/exch2:
205     - rename+move: nTiles in W2_EXCH2_PARAMS.h --> exch2_nTiles in W2_EXCH2_TOPOLOGY.h
206     - exch2 version of Cumul-Sum routine: S/R W2_SET_MAP_CUMSUM set up the
207       (2*nTiles)x(nTiles) Cumul-Sum matrix and Master Proc collects all tiles X,Y
208       increments, calculates Cumul-Sum @ tile origin and sends results to each tile.
209    o pkg/diagnostics:
210     - deal with pairs of post-processed diags which are computed together; in
211       particular, re-order list of diags within 1 file to save 2nd computation.
212     - add S/R to compute velocity stream-function (called after velocity-potential
213       calculation) from divergence free transport -> new diagnostics "PsiVEL".
214     - add parameter to select grid-point location where PsiVEL == 0.
215    o eesupp/src:
216       new S/R to calculate cumulated sum on tiled array, corner grid-cell location
217       (specific S/R needed with exch2 topology - for now, just print an error msg)
218    o pkg/shelfice
219     - Implement friction velocity-dependent transfer coefficients following
220       Holland and Jenkins, JPO, 1999
221       Original code by M. Losch with small modifs.
222       Enable with CPP option SHI_ALLOW_GAMMAFRICT
223       and runtime flag SHELFICEuseGammaFrict
224    o verification lab_sea & global_ocean.cs32x15:
225     - use tools/xmakedepend (instead of cyrus_makedepend, in genmake_local):
226       does not miss some dependencies (but is slower) and also works with many files
227       (default makedepend limitation for AD built).
228     - use cyrus_makedepend in adjustment.128x64x1 (so that it still tested).
229    o pkg/diagnostics:
230     - add run-time parameter "useMissingValue" (def=False) to fill land-point
231        (i.e., where mask=0) with MissingValue ; used only in MNC output file.
232       This replaces CPP-option DIAGNOSTICS_MISSING_VALUE.
233     - Extend the use of "missing_value" setting from data.diagnostics for the case
234       of counter-diagnostics (where fraction-weight is zero). This applies both to
235       MNC and MDS output files.
236    o pkg/seaice/seaice_growth.F:
237      - add 'a priori' cap of latent heat flux based on actual mass considerations
238        when SEAICE_ADD_SUBLIMATION_TO_FWBUDGET is used in conjunction with the
239        non-legacy seaice_solve4temp.
240      - add diagnostic of the residual sublimation freshwater flux (the freshwater
241        flux taken from the ocean if the total actual latent heat fluxes exceed
242        the maximum)
243      - remove the CPP switch around the *_FWbySublim unit change and move diagnostic
244       fill for SIatmQnt, SIfwSubl, SIatmFW to the end of seaice_growth.F.
245      - add diagnostic of the actual sublimation freshwater flux (that is 0. ifndef
246       SEAICE_ADD_SUBLIMATION_TO_FWBUDGET) and of the latent heat flux (evap+sublim).
247      - bug fix : frWtrAtm needs a_FWbySublim ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET.
248      - bug fix : missing part to Martin's r_FWbySublim pathological case fix.
249    o verification 1D_ocean_ice_column:
250       made model domain truly 1x1x23 instead of 5x5x23 with only center cell (3,3,:) wet
251       update results
252    o pkg/diagnostics:
253     - Implement setting of "Post-Processed" diagnostics (corresponding to gdiag(5)='P')
254       which are not filled-up but computed from other diags ; In this case, the mate
255       diag points to the primary (filled-up) diag to used for post processing.
256     - Update Velocity-potential computation using post-processed diag framework.
257     ==> Change the ordering of fields and time-periods in MDS output file
258       when using periodic averaging: now writes one time record with the full set
259       of fields for this time period, then the next time reccord (it used to be
260       one field with the full set of time records then the next field).
261         Note: this is now similar to NetCDF (MNC) output file. <==
262    
263    checkpoint62z (2011/06/21)
264    o adjoint monitor:
265     - Add adjoint monitor output for packages exf, seaice
266       and update relevant testreport output
267    o pkg/seaice:
268     - re-order diags inits so that they appear in order in available_diagnostics.log
269     - added diags: hsnow thermo. rates of change, area preceeding ridiging process,
270       area/heff/hsnow preceeding thermodynamic growth/melt.
271     - modified diag: SIdA; output actual effect, as the description states.
272     - modified description: SIqneti, SIqneto, SIuheff, SIvheff, SIdAb*, HSNOW.
273     - retired redundant diags: SIyneg, SIfice, SIsnwice, SIthdgrh.
274       (SIyneg->SIdHbOCN; SIfice->SIdHbATC; SIsnwice->SIdHbFLO;
275        and SIthdgrh->SIdHbOCN+SIdHbATC+SIdHbATO)
276     - modified diags (2) : switch all SIdA*, SIdH*, SIdS* from delta to rates.
277     - added diagnostics for seaice generic tracers (SItr*).
278     - added SItrUnit and SItrNameLong run time param (for SItr* diags).
279     - in diag names, replaced 'PrTh' abbrev. of 'preceeding thermo' with 'PT'.
280     I. Fenty: 18-Jun-2011:
281     Minor changes to seaice package:
282     1) Retired old variables (A22, SEAICE_lhsublim, areaMax, areaMin, hiceMin) and
283        added some new ones (SEAICE_area_reg, SEAICE_hice_reg, SEAICE_area_floor)
284       - Differentiated "regularization variables" from "floor variables"
285        * areaMin became SEAICE_area_reg (old A22) and SEAICE_area_floor
286        * hiceMin became SEAICE_hice_reg (old hiceMin)
287          (with _reg meaning regularization variable)
288       - SEAICE_lhSublim becomes lhSublim, the sum of SEAICE_lhEvap and SEAICE_lhFusion
289        so as to ensure energy conservation when going between phases
290      - A22 was not used anywhere
291     2) Changed regularization procedure for heffActual and hsnowActual to ensure
292        well-boundedness and smooth adjoint in seaice_growth.F
293     3) Fixed a bug where seaice_solve4temp would not recognize ice-free grid cells
294        because the old regularization always set heffActual >= 0.05 cm
295     4) Changed the model so that the default behavior is to put a small (10^-5) "floor"
296        on AREA when HEFF > 0.
297      - went from requiring ALLOW_PRECLUDE_INFINITESIMAL_AREA to be defined to
298        requiring that DISABLE_AREA_FLOOR *not* be defined
299     Affected verifications:
300      - 1D_ocean_ice_column (output.txt output_adm.txt)
301      - global_ocean.cs32x15 (output.seaice.txt output_adm.seaice.txt)
302    o pkg/diagnostics:
303      - move MNC code from diagnostics_out.F into new diagnostics_mnc_out.F (2 S/R).
304      - rename S/R GETDIAG to DIAGNOSTICS_GET_DIAG and change type of 1rst argument
305        (was _RL, now integer) with option = 0 to retrieve all levels.
306      - add pieces of code to compute velocity potential at each level (new diagnostics
307        PhiVEL, works only when UVELMASS & VVELMASS are also turned on);
308        for now, using same params as CG2D (target-resisual, max Nb of iter ...).
309      - fix few issues with counter diagnostics in diagnostics_setdiag.F &
310        diagstats_setdiag.F (if diagnostic counter is itself a counter diag)
311        and in diagnostics_fract_fill.F (do not need a valid pointer for the
312        diagnostics counter-mate); check that definition of counter-diagnostic
313        includes a valid counter-mate (in diagnostics_set_levels.F).
314    o model/src (rStar):
315      - add rStar scaling factor in diags_phi_hyd.F (similar to calc_grad_phi_hyd.F);
316        affect solution only if z* with full pressure in EOS;
317        update output of test-exp global_ocean.90x40x15.
318    o pkg/seaice:
319      - introduce siEps=1e-5 parameter
320      - use areaMax in AREA update (part 4), consistent with ridging step (part 2.5).
321      - re-organize SEAICE_ADD_SUBLIMATION_TO_FWBUDGET code.
322      - introduce ALLOW_SITRACER and seaice_tracer_phys.F to handle generic seaice tracer.
323        For now it covers, and was tested for, ice salinity and age (attached to HEFF),
324        as well as ice cover age and ridging index (attached to AREA).
325        For now the run time parameters (in data.seaice/SEAICE_PARM03) are
326        SItrName (e.g. 'age') and SItrMate ('HEFF', which is the default, or 'AREA').
327        Up to SItrMaxNum=3 tracers can be used simultaneously.
328    o pkg/salt_plume:
329      -introduce SPsalFRAC run time parameter that sets the fraction of the
330       salt by-product of ice growth (SPsalFRAC*(1-SIsalFRAC)*salt typically)
331       that gets vertically redistributed (fluxed down) by pkg/salt_plume.
332    o model debug options:
333      - Switch reading of debugMode from S/R INI_PARMS (parameter file "data", stored
334        in PARAMS.h) to S/R EESET_PARMS (parameter file "eedata", stored in EEPARAMS.h).
335      - Refine debug-msg printing selection (3 new levels):
336        debugMode  : controls printing of debug messages (sequence of S/R calls).
337        debugLevel : controls printing of algorithm-relevant auxiliary/debug messages
338         debLevZero =  0 ; /* level of disabled aux. msg printing */
339         debLevA =  1 ; /* level of minimum  aux. msg printing */
340         debLevB =  2 ; /* level of low aux. print (report read-file opening)*/
341         debLevC =  3 ; /* level of moderate debug prt (most pkgs debug msg) */
342         debLevD =  4 ; /* level of enhanced debug prt (add DEBUG_STATS prt) */
343         debLevE =  5 ; /* level of extensive debug printing */
344        New debugLevel default: with default debugMode value (=F),
345          = 2 (debLevB) or = 1 (debLevA) in case ALLOW_AUTODIFF is defined.;
346          and if debugMode=T, default debugLevel = 4 (debLevD).
347        Relation with previous settings:
348         debLevB (=2) corresponds to former debLevA (=1)
349         debLevD (=4) corresponds to former debLevB (=2)
350        Note:
351         a) if debugLevel=0, skip WRITE_GRID call when nIter0 > 0 (same as before);
352         b) default debugLevel=1 is convenient in AD runs (avoid many file opening msgs);
353            to recover previous default, set debugLevel=2 (e.g. AD-test hs94.1x64x5)
354      - Add new parameter (printResidualFreq, read from PARM02 namelist) to print
355        detailed CG solvers convergence; off (=0) by default, except if debugLevel=5.
356    o pkg/obcs:
357      - change OBCSfixTopo default from True to False (should not change the results);
358        keep OBCSfixTopo=T in verification-exp. seaice_obcs.
359    o pkg/thsice:
360      - fix bug in thsice_calc_thickn.F (was introduced in version 1.18) in
361        2nd layer seaice sublimation (unlikely to happen)
362      - use Interior mask for OBCS in thsice_advection.F (similar to what is
363        done in gad_advection & seaice_advection).
364    o adjoint:
365      bug fix spotted by Gael Forget:
366      seaice_advection and thsice_advection still had
367      legacy CPP options to avoid CS corner updates for adjoint
368    o pkg/seaice:
369      => Change some of the defaults (2011/05/29):
370         - change SEAICEuseFluxForm default (from False to True)
371         - change DIFF1 default (from 0.004 m/s to 0. m/s)
372         And print warnings if DIFF1 is not set in data.seaice and centered
373          avection scheme is used without any diffusion.
374      also:
375      - fix seaice_diffusion calls in default AdvScheme part of seaice_advdiff.F;
376      - set SEAICEdiffKh[] default in the same way as SEAICEadvSch[]
377      - stop if DIFF1<>0 with SEAICEadvScheme <> 2, if DIFF1<>0 with any
378        other non-zero SEAICEdiffKh[] diffusivity, if SEAICEadvSalt=T with
379        #undef SEAICE_VARIABLE_SALINITY, if SEAICEadvAge=T with #undef SEAICE_AGE.
380      update results of test exp.:
381         lab_sea: output.fd (switch to AdvScheme=33 with diffKh=20)
382             output.hb87, output_adm.evp (SEAICEuseFluxForm=T and diffKh=200)
383             output_adm.noseaicedyn (SEAICEuseFluxForm=T)
384         offline_exf_seaice: output.seaicetd, output_adm (SEAICEuseFluxForm=T)
385         seaice_obcs: output (SEAICEuseFluxForm=T)
386      and prescribe old default for SEAICEuseFluxForm (=F) and DIFF1 (=0.004)
387          for standard fwd & AD lab_sea tests (to keep the same output).
388    o pkg/seaice/seaice_growth.F:
389      - use Ian Fenty's capping formulas for actual ice
390      thickness thoughout EVOLUTION branch.
391      - put treatment pathological case #2) in CPP brackets
392      (ALLOW_AVOID_INFINITESIMAL_AREA, undef by default).
393      - update global_ocean.cs32x15 and 1D_ocean_ice_colum results accordingly.
394    o pkg/seaice:
395      - seaice_diffusion.F : remove the min(DX,DY) factor permanently;
396      pass the Laplacian diffusivity (in m^2/s) diffKh as a parameter;
397      also pass fac as a param, which can be 1. (to update the tendency
398      field) or the time step (to update the field itself).
399      - seaice_advdiff.F: for multidim, call seaice_diffusion with
400      e.g. SEAICEdiffKhHeff and with fac=1; for single-dim, call
401      seaice_diffusion with e.g. SEAICEdiffKhHeff and with fac=time step.
402      - SEAICE_PARAMS.h, seaice_readparms.F, seaice_check.F :
403      hooks to handle SEAICEdiffKhHeff, SEAICEdiffKhArea, etc.
404    o pkg/seaice:
405      diffusion with centered advection scheme (diffus.F & advect.F):
406      - simplify S/R DIFFUS (put deltaT & DIFF1 factor outside, move EXCH outside)
407        to just compute the laplacian of input-field.
408      - unroll k loop (harmonic,biharmonic diff) in advect.F to save 1 exch call.
409      - fix flux-form version in diffus.F to conserve tracer.
410      update output of lab_sea.fd & lab_sea.hb87 (1rst set of modif affects
411       machine truncation) and lab_sea.salt_plume (conservative flux-form modif)
412    
413    checkpoint62y (2011/05/26)
414    o pkg/seaice:
415     - seaice_growth.F : in EVOLUTION branch, always include
416     a_QSWbyATM_cover in qnet (as it should be).     a_QSWbyATM_cover in qnet (as it should be).
417   - verification/global_ocean.cs32x15 : update results accordingly   - verification/global_ocean.cs32x15 : update results accordingly
418     (output.seaice.txt output_adm.seaice.txt).     (output.seaice.txt output_adm.seaice.txt).
419  o pkg/seaice + obcs:  o pkg/seaice + obcs:
420   - use maskInW & maskInS in multi-dim advection and biharmonic diffusion:   - use maskInW & maskInS in multi-dim advection and biharmonic diffusion:
421     equivalent of assuming no tracer gradient outside the OB region.     equivalent of assuming no tracer gradient outside the OB region.
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