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revision 1.1522 by mlosch, Wed Oct 26 09:30:32 2011 UTC revision 1.1668 by heimbach, Fri Jun 8 17:58:50 2012 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o verification/bottom_ctrl_5x5/
8      update reference output (results changed quite some time ago,
9      not sure when; but new reference results look ok in terms of grdchk)
10    o verification/1D_ocean_ice_column/
11      For verification purposes, the exact adjoint rather than an approx.
12      should be used (e.g., to comare against F.D. or TLM).
13      removed autodiff_inadmode*_ad.F routines in code_ad/
14      Update results/ accordingly.
15    o pkg/cal:
16      - change cal_getdate.F so that output date is function of input time only
17        (less ambiguous, not mixed up with input iteration number).
18      - fix calendarDumps for non-zero phase-lag (S/R CAL_TIME2DUMP).
19    o pkg/diagnostics:
20      - implement calendarDumps also for stats-diags
21      - implement calendarDumps also for snap-shot output (negative freq)
22      - for now, ignores calendarDumps if non-zero phase-lag.
23    
24    checkpoint63n (2012/06/04)
25    o model/src:
26      - recompute rSurfW & S to ensure consistent column thickness (needed for rStar)
27        between Sum_k(hFac*drF) and rSurf-rLow, for now only when using pkg/shelfice;
28      - use h0FacC, W & S to compute hFac_surfC, W & S in calc_surf_dr.F (more
29        similar to calc_r_star.F); update results of experiment internal_wave and
30        tutorial_global_oce_in_p (affected @ truncation level).
31    o pkg/shelfice:
32      - add parameterisation of advective-diffusive flux into the ice shelf
33        according to Holland and Jenkins (1999), eq.22-33, as suggested by Jan De Ryd
34      - simply eps3/3a computation
35    o eesupp:
36     - add new CPP option (DISCONNECTED_TILES) to disconnect tiles (no exchange
37       between tiles, just fill-in edges assuming locally periodic subdomain) and
38       add corresponding exchange subroutines (EXCH0);
39     - new CG-solver version (_EX0) for disconnected-tiles special case.
40    o model/src (CG-solvers):
41     - modify Single-Reduction version (CG2D_SR) in case cg2dMaxIters is reached
42       (similar final residual output and max-Iter number as with standard version);
43     - allows to store and use lowest-residual solution (standard & _SR versions);
44     - cleaning up (remove old, commented out code, LETS_MAKE_JAM ...).
45     - by default, also compile CG2D_SR version (define ALLOW_SRCG in CPP_OPTIONS.h)
46    o eesup/src:
47     - global_vec_sum.F cleaning: add a BARRIER ; update comments ; remove ndef
48       ALWAYS_USE_MPI (no longer needed after fixing usingMPI settings - March 2012)
49    o pkg/salt_plume added to lab_sea/input_ad.noseaicedyn
50    
51    checkpoint63m (2012/04/27)
52    o pkg/shelfice:
53     - account for partical cells in surface level below ice-shelf for hydrostatic
54       pressure calculion (set uniformFreeSurfLev to F); update isomip experiments.
55    o ad test experiments:
56     - update and rename to "ad_optfile.local" local AD-optfile specific to a
57       particular adjoint verification experiment (in verification/*/code_ad/)
58    o pkg/seaice & pkg/exf:
59     - Part two of ECCO-CLIVAR code merges.
60       Completes merge of seaice area relax. code.
61       Requires unified CPP option EXF_ALLOW_SEAICE_RELAX
62       to be set in EXF_OPTIONS.h since this pkg controls its I/O
63       (and avoids second CPP option in SEAICE_OPTIONS.h)
64     - change default value of costIceStart & costIceEnd to a valid date.
65     - add snowPrecip to HSNOW in seaice_growth
66    o pkg/ptracers:
67     - move ptracers summary and setup check into separated S/R ; add a check for
68       valid PTRACERS_Iter0 value (error+stop or just warning).
69    o pkg/cal (+ pkg/ecco):
70     - avoid calling a S/R with 2 times the same arg (FWD: unless both are only used
71       as input; and for AD, unless both are not differentiable (e.g., k index)).
72    o model/src:
73     - define internal flag "uniformFreeSurfLev" (=T when free-surface level-index
74       is everywhere k=1) to speed-up some calculations (by pass kSurf reference);
75       temporary set to usingZCoords value (to be changed to F when using shelfice).
76     - hydrostatic pressure: implement partial cell near the surface also for
77       Z-coordinates (for the case where uniformFreeSurfLev=F); replace test on
78       usingZCoords with test on uniformFreeSurfLev where needed (in NonHyd code).
79    o pkg/ctrl/ctrl_init.F:
80     - add a formal parameter to s/r ctrl_init_rec to print
81       xx_$(ctrl_valiable)_file for easier debugging
82     - move call of cal_* routines into the if-block where they are really
83       needed so that xx_$(ctrl_variable)_period can be 0 or -12 without having
84       to specify a startdate
85    o pkg/seaice:
86     - update comments in SEAICE_OPTIONS.h (+ similar update of lab_sea/code and
87       global_ocean.cs32x15/code versions).
88     - turn on seaice Multi-category (in data.seaice, SEAICE_multDim=7) for
89       verification experiment global_ocean.cs32x15.seaice and update results.
90    o pkg/exf:
91     - new S/R EXF_GETFIELD_START to return starting-time of a forcing field
92       (according to useExfYearlyFields).
93    o pkg/cal:
94     - move calendar setting & summary (previously in cal_readparams.F) into new
95       S/R CAL_INIT_FIXED to be called later in the initialisation process, once
96       length of the simulation is set (after SET_PARMS call); This is an attempt
97       to fix Pb when, e.g.: pkg/longstep, modifies the length of the run.
98     - For safety: keep a record of pkg/cal parameter settings status
99               to allow to STOP if one pkg/cal S/R is called too early.
100     - add a stop in all basic pkg/cal subroutines if called before setting is done.
101     - modify cal_getdate.F: stop when nothing was returned;
102       if called with myIter=-1, simply retrun modelBaseDate (1,2 = startDate_1,_2);
103       this allows to remove "cal.h" from seaice_read_parms.F & init_mnc_vars.F.
104    
105    checkpoint63l (2012/04/04)
106    o pkg/bbl:
107      - fix call to FIND_RHO_2D in bbl_calc_rho.F (case multi-tiles per proc);
108        update global_with_exf output.yearly.txt file.
109    o pkg/cal:
110      - start to clean-up cal_set.F ; fix for the case where baseTime is non-zero.
111      - remove 2 unsused and very short (1 line only) functions ;
112      - remove unsused subroutines from AD-Diff list.
113    o model/src:
114      - start to implement clean wait to stop in initialization S/R (config_check.F,
115         packages_check.F, ini_parms.F and pkg/obcs/obcs_check.F + pkg/mypackage)
116    o folowing PRINT_MESSAGE changes:
117      - remove reminder multiple print to the same file (STDOUT) when multi-threads.
118    o pkg/bbl:
119      - modification so it can work with z*
120      - replace deltaT with dTtracerLev(k) for asynchronous time stepping
121      - global_with_exf/input.yearly verification; changes output.yearly.txt
122    o eesupp/src:
123      - PRINT_MESSAGE: use OpenMP critical instruction (similar to PRINT_ERROR);
124        writing to unit 0 (if unit=errorMessageUnit) extended to the case myThid=1
125      - CHECK_THREADS: specific code if using OpenMP threading: improve checking of
126        # of threads across processors (e.g., different env OMP_NUM_THREADS setting)
127      - improve special preliminary call to EESET_PARMS (if eedata is read 2 times).
128      - when using MPI, always set usingMPI=T ; set default accordingly and stop
129        if not consistent.
130      - ALL_PROC_DIE: add a BARRIER after MPI_FINALIZE call ; skip this when thread
131        argument is zero (in case called within single-thread section).
132    o pkg/fizhi:
133        clean-up turbulence cold-start switch: decided in fizhi_init_vars.F, stored
134        in common bloc (fizhi_coms.h) and then passed as argument up to S/R TURBIO.
135    o pkg/exch2:
136      - add argument "updateCorners" to S/R exch2_get_uv_bounds (enable to
137        activate EXCH_IGNORE_CORNERS in vector EXCH S/R).
138      - switch 1rst EXCH call to IGNORE_CORNERS (instead of UPDATE_CORNERS)
139        but keep the 2nd with UPDATE_CORNERS: this prevents overwriting good data
140        with bad ones coming from a not-yet-updated halo.
141        This should fix the problem when sNx <> sNy and GCD(sNx,sNy) < 2*Olx.
142    o pkg/frazil:
143        move FrzForcT diag from frazil_diagnostics_state.F to frazil_calc_rhs.F
144        http://mitgcm.org/pipermail/mitgcm-devel/2012-March/005384.html
145    o model/src/config_check.F: add a check for OLx>sNx/OLy>sNy
146    o verification/lab_sea
147      * #undef SEAICE_EXCLUDE_FOR_EXACT_AD_TESTING
148      * #define ALLOW_SST_CONTROL & ALLOW_SST_CONTROL
149      * nTimeSteps 3 -> 4
150      * changed reference output accordingly
151    o pkg/ctrl:
152      * fix ctrl_get_gen for xx_sst, xx_sss
153    o pkg/fizhi:
154      - fix 2 calls to S/R GRD2MSC (argument igrd) in update_earth_exports.F
155        update results of exp. fizhi-cs-32x32x40 (fail with only 6 digits for cg2d)
156      - by default, use new version of S/R GETPWHERE (#define TRY_NEW_GETPWHERE);
157        fix few out-of-bounds indices in referencing vars (initialise igrd to 1);
158        clean-up fizhi_turb.F (remove unused & uninitialised qdiaglsm array).
159    o pkg/gmredi:
160      - add diagnostic of Redi (main diagnonal) vertical diffusive flux of Temp
161    o pkg/fizhi:
162      - fix few initialisation and multi-tile Pb: aqualev & gridalt now pass the
163        (old)aces open64 tuv test.
164    o pkg/icefront: fix bug and reorder loop in icefront_init_varia.F
165    o pkg/mom_vecinv:
166      - fix 1 loop range in mom_vecinv.F to be like all the other loops which
167        set/update gu,gv/Diss (fix Pb of uninitialised fVerUkp in admom_vecinv
168        with non-lin free-surf).
169    o model/src: move k-loop outside of i/j-loops when (re-)computing R_low
170      in ini/update_masks_etc.F in order to avoid -O3 optimization problems with
171      some compilers (gfortran 4.6.0 on MacOS)
172    o momentum:
173      - separate fVer?(:,:,kUp) & fVer?(:,:,kDown) in argument list of MOM_FLUXFORM
174        & MOM_VECINV subroutines (to help TAF). This fixes Pb of uninitialised
175        fVer?(kUp) in admom_fluxform with non-lin free-surf or bottom control.
176    
177    checkpoint63k (2012/03/17)
178    o model/src:
179       - selectAddFluid (ALLOW_ADDFLUID): add missing term in horizontal momentum
180         flux-form (mom_fluxform.F) and vertical momentum (calc_gw.F) equations.
181       - SOLVE_DIAGONAL: switch default to use adjoinable & vectorized version
182         (#undef SOLVE_DIAGONAL_LOWMEMORY); update output of exp. front_relax.bvp.
183    o model/src: solve_*diagonal.F
184       - replace division with multiplication by inverse (similar to original version)
185         update output of AD exp. global_ocean.90x40x15.
186       - fix pkg/gmredi/gmredi_calc_psi_bvp.F & pkg/ggl90/ggl90_calc.F
187         to enable the use of the vectorized & differentiable solve_tridiagonal.F
188       - test exp. global_ocean.90x40x15/input_ad: switch to advection scheme 20 for
189         vertical advection (to get solve_tridiagonal tested in AD mode).
190    o pkg/seaice: ECCO-CLIVAR merge:
191      1. seaice AREA relaxation
192         * CPP option: SEAICE_ALLOW_AREA_RELAXATION
193         * runtime flag: SEAICE_tauAreaObsRelax
194      2. modified global mean cost imbalance code: CPP option
195          ALLOW_SSH_GLOBMEAN_COST_CONTRIBUTION
196    o another iteration on solve_*diagonal.F
197       Make choices independent of AUTODIFF
198       Default will be the adjoinable vectorized version.
199       Alternative choices are:
200       * non-adjoinable original version with low memory footprint:
201         #define SOLVE_DIAGONAL_LOWMEMORY
202       * still adjoinable but does not vectorize (k as inner-most loop):
203         #define SOLVE_DIAGONAL_KINNER (keeping SOLVE_DIAGONAL_LOWMEMORY undef)
204    o testreport
205     - add option to use a home made wrapper around "make"
206     - remove MITGCM_IEEE env. variable (no longer active)
207    o pkg/shelfice
208     - improve computation of friction velocity for velocity dependent
209       exchange coefficients: include velocities into SHELFICEBoundaryLayer
210       block to average velocities vertically
211     - add TAF store directives for SHI_ALLOW_GAMMAFRICT
212    o Modify diagonal solvers, now three versions (upon request):
213      #ifndef SOLVE_DIAGONAL_AUTODIFF
214        1. default version (dating back a while ago)
215      #else /* def SOLVE_DIAGONAL_AUTODIFF */
216      # ifdef SOLVE_DIAGONAL_KINNER
217        2. adjoinable version with k-innermost loop (G. Forget)
218      # else
219        3. adjoinable vectorized version of 2.
220      # endif
221      #endif /* SOLVE_DIAGONAL_AUTODIFF */
222      All flags are currently set within routines, but could/should be moved to CPP-options.
223      Array bounds for 1. are as before, for 2.,3. cover the entire domain
224      (could be changed for 1. too).
225    o verification/lab_sea (fwd):
226      - update the 4 fwd lab_sea test experiment: no longer SEAICE_GROWTH_LEGACY,
227        use 7 categories (except hb87), new solve4temp params (except salt_plume),
228        constant salinity (=4) or variable salinity (salt_plume) done through
229        SItracer.
230    o pkg/seaice:
231      - rename parameters: SIsalFrac to SEAICE_saltFrac & SIsal0 to SEAICE_salt0;
232      - remove old parameters ( SEAICE_freeze, SEAICEturbFluxFormula, SEAICE_gamma_t,
233         SEAICE_gamma_t_frz, SEAICE_availHeatTaper & SEAICE_availHeatFracFrz)
234        from SEAICE_PARMS.h ; still need to fix seaice_cost_sst.F (broken when
235        SEAICE_freeze got retired) but already better than previously with
236        SEAICE_freeze=123456.7 deg.C;
237      - move setting of facOpenGrow/Melt from SEAICE_INIT_FIXED to SEAICE_READPARMS
238        (safer multi-threaded setting); always set SEAICEuseEVP;
239      - setting of ocean-ice turb. flux coeff: moved from SEAICE_CHECK to
240        SEAICE_READPARMS & SEAICE_INIT_FIXED (this fixes wrong summary report);
241        stop if multiple specifications for the same coeff; make sure default
242        SEAICE_mcPheePiston is compatible with drF(1) & deltaT.
243    o pkg/obcs:
244      - allow to switch to upwind 1rst order advection scheme for the advective
245        flux computation at the open-boundary; disabled for adjoint built.
246    o pkg/ptracers:
247      - rename PTRACERS_RESTART.h -> PTRACERS_START.h
248      - rename ptracers_fields_blocking_exchanges.F -> ptracers_fields_blocking_exch.F
249      - add parameter to decide when to start a tracer; use internal flag to
250        know which tracer to step-forward; switch this internal flag at the top
251        of forward_step.F (new S/R PTRACERS_SWITCH_ONOFF); for now, not enabled
252        for adjoint built.
253    o pkg/seaice:
254      - add SEAICE_SIZE.h anywhere in the code where SEAICE.h is included ;
255      - move MULTDIM declaration and setting from SEAICE.h to SEAICE_SIZE.h ;
256      - keep experiment offline_exf_seaice truly single category (set MULTDIM=1).
257    o pkg/ecco:
258      - fix writing of output file DiagnosCost_ClimSalt/Theta
259        and DiagnosCost_DriftSalt/Theta (if multi-tiles per proc).
260    o pkg/seaice:
261      - add missing initialisation of COR_ICE array in dynsolver.F
262      - merging SEAICE_MULTICATEGORY define and undef cases. Now the same code is
263        compiled either way, and is tested in all exps (multidim was only tested
264        in lab_sea ad before).
265      - cosmetic change to prepare for future addition of ITD. no change to results.
266        no defaults change.
267      - added run time param SEAICE_multDim (7 for SEAICE_MULTICATEGORY, 1 otherwise).
268      - by lack of adequate verification experiments, I further used custom versions
269        of global_ocean.cs32x15 to test multicat or not, with pickup or not. All
270        should be correct.
271      - avoid recomputations in ad.
272    o array initialisation in adjoint mode:
273      1) pkg/mom_common/mom_calc_ke.F:
274        add full array initialisation of KE inside mom_calc_ke.F (ALLOW_AUTODIFF_TAMC):
275        The S/R which calls MOM_CALC_KE initialises KE but in some recomputation
276        part this initialisation is gone, resulting in Floating Point Exception
277        (caught by open64 compiler with debug option).
278      2) model/src/convective_weights.F
279        set output convectCount over the full array range (instead of doing
280        an update): this fix a similar issue when called within recomputation (adjoint)
281        which could by-pass the initialisation (normally done in the caller S/R).
282    o pkg/seaice:
283      - final version of turbulent flux params, as agreed at MIT ice meet:
284           SEAICE_mcPheePiston (default is ~ 0.000875)
285           SEAICE_mcPheeTaper (default is 0.)
286           SEAICE_frazilFrac (defualt is 1.)
287           SEAICE_mcPheeStepFunc (default is false)
288      - changes results at trunction error level
289      - ifdef SEAICE_EXTERNAL_FLUXES, disallow SEAICE_waterAlbedo
290    o added pkg/frazil:
291      - see frazil_description.tex for details
292      - verification experiment is global_with_exf/input.yearly; changes output.yearly.txt
293    o pkg/shelfice/shelfice_thermodynamics.F
294      - fix exponents for velocity dependent exchange coefficients: change
295        from 2/3(=0) to 0.66666666666666667
296      - move computation of velocity dependent exchange coefficients into
297        separate loop, so that it applies to both thermodynamics
298      - move some divisions by constants out of loops
299    
300    checkpoint63j (2012/02/16)
301    o pkg/seaice:
302      - overhaul of seaice_summary.F after feb 2012 clean-up of seaice_growth.F etc.
303      - SItracer:  added run time params, and allow coupling to ocn salinity.
304    o pkg/seaice: remove (almost) all divisions by constants within loops
305      in seaice_growth.F and seaice_solve4temp.F, this changes (only) the cg2d
306      results of global_ocean.cs32x15.seaice from 16 to 11 digits (but only
307      those, caused by 1/QI -> recip_QI) -> update output.seaice.txt,
308      output_adm.seaice_dynmix.txt and also lab_sea: output_adm.evp.txt
309    o pkg/seaice :
310      - simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula
311        = 1 or 2, using newly added run time parameter SEAICE_availHeatTaper.
312      - fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148.
313      - add permanent SItflux diag that corresponds to TFLUX but includes
314        ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget.
315      - allow activation/testing of a fix for suspected missing term in
316        ocn-ice heat budget (to be confirmed). To test this, you want to
317        undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param
318        SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic.
319      - no change in results, fwd or ad.
320    o global_ocean.cs32x15/results: 3 changes following from the pkg/seaice commit below:
321      - switch to variable freezing point.
322           Results change : cg2d -> 1 digits; ad -> 3-6-6 digits.
323      - bug fix : the sublimation term that was missing is now activated.
324           Results change : cg2d -> 2 digits; ad -> 8-6-6 digits.
325      - bug fix : flooding sign term for SIsal0.NE.0.
326           Result change : cg2d -> 8 digits; ad -> 11-12-9 digits.
327    o pkg/seaice:
328      - unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT
329        is now the default, and the old default constant freezing point is recovered
330        with SEAICE_tempFrz0    = -1.96,
331             SEAICE_dTempFrz_dS = 0.,
332      - retire SEAICE_freeze (= the old way of specifycing the constant freezing point)
333      - remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there.
334      - bug fix (thanks to M. Losch) : the sublimation term that was missing is now
335        activated. To reproduce old results with this bug define SEAICE_DISABLE_SUBLIM.
336      - bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211)
337        was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail).
338      - bug fix (thanks to O. Jahn) : area loss for melting  got messed up in
339        seaice_growth r149 for legacy branch (no results change).
340      - introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code
341        from I. Fenty).
342      - results did not change except for global_ocean.cs32x15, mostly due to the
343        switch to variable freezing point (see above item for detail).
344    o pkg/thsice:
345      - fix and simplify interface to salt_plume pkg ; diagnose directly amount of
346        seawater freezing in thsice_calc_thickn (not used).
347    o pkg/seaice: turbulent flux term specification via run time params.
348      - replace CPP switches with run time switches to facilitate testing
349      - retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX,
350                       GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
351      - added runtime parameter : SEAICEturbFluxFormula
352      - move Mcphee constants to SEAICE_PARAMS.h
353      - seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula;
354                 SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply);
355                 remove seaice_summary call (moved to seaice_init_fixed)
356      - seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on
357        SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms)
358      - seaice_summary.F : add missing report of read turbulent flux term set up
359                           and SITRACER.
360      - seaice_check.F : check range; inform and stop if retired CPPs are used
361                         (incl. SEAICE_AGE).
362      - seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without
363             CPP switch, same computation as before for the different options.
364      - change results at the truncation level.
365    o pkg/seaice:
366      - remove un-used parameters LAD & MAX_TICE ; add new run-time parameters:
367        useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and
368        SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY.
369      - update verification/*/input*/data.seaice:
370        to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY
371        code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ;
372        and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code,
373        set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0.
374    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY):
375      - remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same
376        algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0);
377        difference in results only due to machine truncation.
378      - remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using
379        MaykutPolySatVap; keep MIN_LWDOWN.
380      - adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation.
381      - update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87,
382        + 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits).
383    o pkg/salt_plume:
384      - isolate saltPlumeFlux array exch into a specific S/R called from
385        do_oceanic_phys.F
386      - add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice.
387    o verification:
388      - move untested set-up to MITgcm_contrib/verification_other.
389    o pkg/seaice:
390      - retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER.
391    o pkg/seaice:
392      - seaice_solve4temp.F (keeping results unchanged):
393        * add 2 future run-time params to select which saturation vapor pressure
394          formula is used and how post-iteration fluxes are set.
395          Temporary set these 2 params according to option SOLVE4TEMP_LEGACY;
396        * New piece of code (not used) to update surf. atmos. heat flux F_ia using
397          the linearized expression to stay consistent with tsurf finding.
398      - seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x
399        can be < 0.
400    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef):
401      - remove from F_ia (and from it's derivative dFiDTs1) the contribution of
402        conductive heat flux F_c , and add it explicitly when updating tsurf as
403        solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf
404        so that now F_ia has a consistent meaning through the entire routine.
405        This causes differences at truncation level: update output of fwd exp.
406        global_ocean.cs32x15.seaice.
407    o pkg/seaice:
408      - lots of editing/cleaning in seaice_solve4temp.F + better documentation
409        of arrays, sign/direction of fluxes; no effect on results.
410      - replace hard coded 273.16 (=previous value of celsius2K) by celsius2K
411        in seaice_budget_ocean.F & seaice_solve4temp.F (SOLVE4TEMP_LEGACY part);
412        note: this should have been done before changing celsius2K default.
413      - to keep results unchanged, add back old value of celsius2K in verification
414        exp. input*/data : lab_sea (AD), offline_exf_seaice (fwd+AD) & seaice_obcs
415      - replace hard coded seawater freezing temp in seaice_solve4temp.F (part
416        SOLVE4TEMP_LEGACY) of 271.20 (=previous value of celsius2K + default
417        value of SEAICE_freeze) by celsius2K+SEAICE_freeze so that seawater
418        freezing temp is consistent with value in seaice_growth.F ; this causes
419        differences at machine truncation level: update lab_sea AD output (3/4).
420    o pkg/seaice:
421      - mask (in exf_init_fixed.F) atemp,aqh,evap,precip,runoff,lwflx,areamask
422        and climsst/sss even when using seaice (to prevent calculation that might
423        use SST on land); does not affect any verification exp.
424      - apply mask to taux,tauy (in seaice_get_dynforcing.F); update output
425        of lab_sea.fd & lab_sea.hb87 and global_ocean.cs32x15.seaice_dynmix.
426    o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness
427      over land (non-legacy code)
428    o vectorize salt_plume package:
429      - add extra code to salt_plume_frac and salt_plume_tendency_apply_s
430      - this code computes plumebk everywhere (also over land), thus requires
431        code to avoid divisions by zero and catch the case of kLev=Nr.
432      - efficiency of salt_plume_frac is still sub-optimal
433    o tools (genmake2):
434      - fix makefile NAME specification (option: -makefile NAME) by adding
435        "-f $MAKEFILE" in few places where it was missing including makedepend
436        command (contribution from Paul).
437    
438    checkpoint63i (2012/01/24)
439    o model/src:
440      - add factorized versions of some EOS code to find_rho.F,
441        define USE_FACTORIZED_EOS to turn it on (default for TARGET_NEC_SX)
442    o model/src:
443      - add celsius2K to namelist PARM01; remove unused recip_rhoNil from PARAMS.h;
444      - change default celsius2K from 273.16 to 273.15
445      - to keep results unchanged, add back old value of celsius2K in verification
446        exp. input*/data : aim.5l_cs, 1D_ocean_ice_column, lab_sea (fwd),
447         global_ocean.cs32x15(seaice) & cpl_aim+ocn(input_atm).
448    o model/src: add a little initialisation trick to find_rho.F and find_alpha.F
449      to make TAF generate vectorizable code
450    o pkg/seaice/seaice_evp.F: add code (copied from CICE) that avoids underflows.
451       Turn on by defining SEAICE_EVP_ELIMINATE_UNDERFLOWS. Most compilers
452       have flags that do this more efficiently.
453    o pkg/diagnostics/diagstats_calc.F
454      - for TARGET_NEC_SX fix the treatment of the scaling factor tmpFac=scaleFact
455    o pkg/obcs (with exch2):
456      - derive OB indices in overlap region from OB-InsideMask (in obcs_init_fixed.F)
457        and remove code (in obcs_readparms.F) which was based on EXCH of indices
458        (through buffer) and did not account for exch2 (e.g., CS-grid) topology.
459    o pkg/exf and seaice exp:
460      - change offline_exf_seaice.seaicetd test exp. to use default DIFF1 value (=0)
461        so that switching off area & heff advection flags does not affect results.
462      - change default EXF_LWDOWN_WITH_EMISSIVITY to #define in EXF_OPTIONS.h
463      - keep exp. seaice_obcs & 1D_ocean_ice_column(ad) unchanged (using #undef
464        EXF_LWDOWN_WITH_EMISSIVITY) and, using pkg/exf default emissivities, update
465        results of verification experiments: 1D_ocean_ice_column(fwd),
466        global_ocean.cs32x15.seaice(fwd+ad) & seaice_dynmix(ad), lab_sea (all 8)
467        and offline_exf_seaice (all 4).
468    o pkg/seaice:
469      - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;
470        remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.
471      - fix bug: areaNm1 & hEffNm1 are needed in seaice_growth (SEAICE_GROWTH_LEGACY)
472        but were not filled when resp. SEAICEadvArea=F & SEAICEadvHeff=F and
473        not multi-dim advection;
474      - fix seaice_growth.F to compile with both SEAICE_GROWTH_LEGACY and
475        SHORTWAVE_HEATING #undef.
476    o optim: make Makefile more robust (?)
477    o pkg/obcs:
478      * fix treatment of obcs_read_pickup for TAF
479    o pkg/shelfice:
480      * add missing initialisation of num_shifwflx
481      * new adjoint verification exp. for isomip
482      * change Prandtl and Schmidt numbers from generic formulations
483        (in terms of model diffus. and visc.) to separate runtime
484        parameters, with Holland and Jenkins (1999) default values.
485    o pkg/exf (interpolation):
486      - extended input field (2 rows) near the N & S poles:
487        * fill in with the symetric value (when even Nb of data in longitude)
488        * add average value at the poles only for scalar quantities ; for vector
489          component interpolation, skip the averaging and keep duplicated values,
490          unless the 2 components have same location (uvInterp=T) in which case
491          interpolate the 2 components together using S/R EXF_INTERP_UV.
492      - new S/R EXF_INTERP_UV to interpolate the 2 components of a vector field
493        together: this allows to account properly for local orientation when
494        averaging at N & S pole.
495      - add CPP option EXF_USE_OLD_INTERP_POLE to recover old results regarding
496        exf-interpolation near N & S poles. Undef by default.
497      - add debug check/print on 1rst iter if debugLevel >=2.
498    o pkg/exf:
499      - change masking flags definition (no longer "parameter"), put them in
500        common block and set them in S/R EXF_INIT_FIXED.
501      - change recognized masking flag from s,u,v to c,w,s since the mask
502        to use (maskC,W,S) depends on position on model grid and has little to
503        do with scalar/vector difference; fix masking if using P-coordinates.
504      - fix masking of wind-stress (was wrong if interpolated or read on A-grid)
505        and update results of exp. global_with_exf (x2).
506      - fix setting of zenith-angle table when SHORTWAVE_HEATING is undef.
507    o pkg/obcs
508      - S/R obcs_calc_stevens: fix a small bug (gammat -> gammas where appropriate)
509    o pkg/exf (interpolation):
510      - assume periodicity in X only if input field cover full longitude range.
511      - improve search for lat. index (supposed to be faster, in ~log2(ny) steps,
512        and should vectorise).
513      - fix input lat of the 2 added row (in case we provide N.pole data).
514    
515    checkpoint63h (2011/12/30)
516    o pkg/seaice:
517      - change declaration of UVM from _RL to _RS in order to get B-grid
518        uIce,vIce monitor when _RS = real*4
519    o pkg/offline:
520      - new S/R OFFLINE_RESET_PARMS for resetting main-model params (switch off flags);
521      - compute vertical velocity if not read from file (switch on exactConserv
522        & staggerTimeStep);
523      - fix output of ptracer monitor iter & time for default PTRACERS_monitorFreq.
524    o verification:
525      - update grid-files (in tutorial_held_suarez_cs/input and fizhi-cs-32x32x40/input)
526        with grid-angle generated using "utils/matlab/cs_grid/cubeCalcAngle.m":
527        fix Pb in yG definition @ 2 missing corners (previously yG was averaged);
528      - update output of exp. global_ocean.cs32x15.viscA4 after changing
529        grid-file angles (used here for coriolis-3d);
530      - remove (or gzip) few files not needed to run fizhi-cs experiments.
531    o pkg/exf (vector interpolation):
532      - rotate vector component toward local grid-axis orientation using grid-angles
533        (stored in GRID.h) instead of locally computed rotation angle; keep old code
534        available with exf option EXF_USE_OLD_VEC_ROTATION (undef by default).
535    o pkg/seaice:
536      - allow to compile with exf options ALLOW_ATM_TEMP or ALLOW_DOWNWARD_RADIATION
537        undefined. Fix and remove the stop when ALLOW_RUNOFF is undefined.
538    o pkg/PKG_OPTIONS.h files:
539      - move #include "CPP_OPTIONS.h" just after #include "PACKAGES_CONFIG.h",
540        outside of the #ifdef ALLOW_THISPKG / #endif block.
541      - update verification/*/code/PKG_OPTIONS.h files.
542    o add a verification experiment (offline_exf_seaice/input.seaice) that test
543      the B-grid LSOR solver
544    o pkg/seaice: sort out emissivity and long wave radiation step 2:
545      - add emissivity for snow and ice as new run-time parameters
546        (unfortunately) that default to the corresponding exf values; this
547        changes results in most verification experiments so that for backward
548        compatibility these parameter have to be set explicitly to inconsistent
549        values (ugly);
550      - the exf-flag EXF_LWDOWN_WITH_EMISSIVITY then gets rid off the hard-wired
551        emissivities of 0.97 associated with lwdownloc in S/R seaice_solve4temp
552        until we agree how to handle this bug properly
553    o pkg/exf (interpolation):
554      - add a set of run-time param ({inputfield}_interpMethod), one for
555        each interpolated input field, to select the interpolation method
556        with a value of zero switching off the interpolation;
557      - print interpolation parameters to standard output;
558      - refine exf_check.F accordingly ; stop if USE_NO_INTERP_RUNOFF is defined
559        (to use instead runoff_interpMethod=0 in data.exf).
560      - simplify default setting of interpolation parameters (for all fields,
561        set position to match model grid cell-center position, leading to trivial
562        interpolation in case of regular Lat-Lon grid) and fix for the case of
563        non-uniform delY.
564    o pkg/exf/exf_radiation.F: add the factor ocean_emissivity to lwdown, for
565       within #ifdef EXF_LWDOWN_WITH_EMISSIVITY/#endif. Unless ocean_emissivity=1.
566       this factor is absolutely required, because the lw exitance (= out-going
567       long wave radiation) is emissivity*stefanBoltzmann*T^4 + rho*lwdown,
568       where the reflectivity rho = 1-emissivity for conservation reasons. Once
569       this is established, we can remove the CPP-Flag (if we want to).
570    o pkg/seaice:
571      - qualify a stop statement in S/R seaice_check: EXF_READ_EVAP and
572        ALLOW_BULKFORMULAE are only required if SEAICE_EXTERNAL_FLUXES is defined
573      - sort out emissivity and long wave radiation, step 1: make SEAICE_emissivity
574        what the name implies (and not emissivity*BoltzmannConstant), this means
575        the old default value of 5.5e-8 now means
576        5.5e-8/5.670e-8 = 0.97001763668430343479 as ocean_emissivity in
577        S/R exf_readparms
578      - FV-discretization of the B-grid LSOR solver, turn on with
579        SEAICE_LSRBNEW. This new solver also involves a slight re-organization
580        of the calling routine dynsolver, so that B and C-grid code look a
581        little more alike.
582      - fix index bugs in ostres.F (B-grid code)
583    o pkg/seaice/seaice_ocean_budget.F: change (unused) code to make it look better
584    o pkg/seaice/seaice_readparms.F: make ocean_emissivity*stefanBoltzmann the
585      default for SEAICE_emissivity, if useEXF; requires setting a wrong
586      parameter value in global_ocean.cs32x15/input.seaice/data.seaice for
587      backward compatiblity
588    o model/src: use sigmaR in calc_ivdc
589    
590    checkpoint63g (2011/12/16)
591    o pkg/seaice/seaice_growth.F:
592      fix heat conservation of the coupled ocean-seaice system.
593      when SEAICE_HEAT_CONSERV_FIX is defined, the mismatch of
594      solid vs liquid water treatment is resolved via QNET.
595    o pkg/seaice/seaice_growth.F:
596      add missing term for sublimation in saltFlux, which was breaking conservation.
597    o pkg/seaice/seaice_model.F:
598      Remove this patholigical case treatment in evolution branch,
599      where it is un-necessary and breaks conservation.
600      Update global_ocean.cs32x15/results accordingly for
601      output.seaice.txt output_adm.seaice.txt and output_adm.seaice_dynmix.txt
602    o model/src:
603      useRealFreshWaterFlux: remove masking of EmPmP (using maskInC) in
604      external_forcing_surf.F and apply mask directly in S/R SOLVE_FOR_PRESSURE.
605    o pkg/obcs:
606      modify Stevens boundary conditions so that S/R obcs_calc_stevens computes
607      tendency for temperature and salinity that is then applied to update
608      theta and salt in S/R obcs_apply_ts; this requires proper masking of all
609      horizontal advection and diffusion contributions on the boundary (in
610      S/Rs gad_advection, gad_calc_rhs, gmredi_rtransport, gmredi_calc_diff), and
611      removing the mask in S/R timestep_tracer. The advantage of this approach is
612      that the updated tracer values include contributions from the surface
613      forcing and vertical diffusion.
614      This modification changes exp4.stevens because of vertical diffusion.
615    o model/src:
616      change non-curvilinear grid setting to also work with exch2 + blank tiles:
617      - move delX,delY to new header file (SET_GRID.h) and adjust length to 1rst
618        face dimensions.
619      - new S/R INI_LOCAL_GRID to define model tile-local grid (using same units
620        as delX,delY) and called from S/R INI_CARTESIAN_GRID, INI_CYLINDER_GRID
621        and INI_SPHERICAL_POLAR_GRID.
622      change test-experiment global_ocean.90x40x15:
623      - split the domain in many more tiles (9x4 tiles of 10x10 each);
624      - switch to exch2 and remove 1 blank-tile (but only for MPI test).
625      - update results of both test (std & dwnslp).
626    o pkg/diagnostics/diagstat_calc.F: fix problem with non-initialised halos in
627       tmp-fields for TARGET_NEC_SX at the cost of extra loops and less vectorisation
628    o model/src:
629      - take sigma-coords related code out of update_etah.F into new S/R UPDATE_ETAWS
630        and fix initialisation when using sigma-coords.
631    o model/src:
632     - improve Gael's changes from Jan 14, 2011 "addition of an 'update' of hfacc etc.
633       to their current value at the beginning of forward_step.F": add a new run-time
634       switch "doResetHFactors" (default=false) and use it to do (or not) the resetting.
635     - set doResetHFactors=T in the following test exp:
636        global_ocean.90x40x15/input (rStar) & input.dwnslp (linFS),
637        global_ocean.cs32x15/input.seaice (rStar), hs94.cs-32x32x5/input.impIGW (linFS)
638        and tutorial_global_oce_in_p (nonLinFS in p)
639    o pkg/ecco
640      - added IES cost term
641    o verification/advect_xz
642      - scale down the depth by 1/100 (from 200 km to just 2.km)
643      - add secondary test using divergent flow, r-star and implicit vertical advection.
644      - add note (check_conserve_TS.txt) and matlab script to check global
645        conservation of T & S with NonLin-FreeSurf and Adams-Bashforth.
646    o pkg/rbcs:
647      - add missing relaxUFile & relaxVFile in namelist (in rbcs_readparms.F).
648    o pkg/obcs (Stevens BCs):
649      - fix various problems in the phase speed computations of the Stevens
650        boundary conditions:
651        - sign error for western and southern boundaries,
652        - time tendencies were underestimated by factor of dTracerLev and some just
653          zero (for multidim advection schemes) -> now estimate time tendencies
654          from difference between previous (n) time level and the one before (n-1);
655          this requires storing a field per tracer per boundary, also in the pickup
656          files.
657        - replace deltaTmom in cflMer/Zon computation with dTracerLev
658        - set default phase velocity to cflMer/Zon
659      - update verification experiment exp4.stevens
660    o pkg/generic_advdiff (implicit_r):
661      - fix implicit vertical advection conservation with AB and/or NonLin-FreeSurf
662        (remove Tr*d/dz(w) in gad_implicit_r.F and add it in gad_calc_rhs.F);
663      - fix implicit vertical diffusion or advection with NonLin FreeSurf
664        (was using current recip_hFacC instead of future recip_hFacC): set future
665        recip_hFac in thermodynamics.F and pass & use it in all vertical implicit
666        solver S/R ;
667      - fill diagnostics of vertical advective fluxes (computed from tendency)
668        when using implicit vert. advection;
669      - update output of exp that uses NonLin-FreeSurf & implicit vertical diffusion:
670         global_ocean.90x40x15 (fwd+AD), global_ocean.cs32x15 (4 fwd +4 AD),
671         tutorial_global_oce_in_p (fwd), tutorial_tracer_adjsens (AD)
672         and cpl_aim+ocn (used in ocean); to be fixed: bottom_ctrl_5x5.
673    o pkg/diagnostics:
674      - add diags for T & S tendency which goes through Adams-Bashforth.
675    
676    checkpoint63f (2011/11/30)
677    o pkg/obcs/obcs_calc_stevens.F:
678      - join some loops to reduce number of if-statements
679      - fix a bug in code for northern and southern boundaries.
680    o pkg/seaice/seaice_init_varia.F
681      - undo resetting UVM=0 that has slipped in unnoticed in r1.49 and
682        caused zero ice-velocities for the B-grid code
683    o pkg/seaice/seaice_init_fixed.F
684      - fix a bug in the initialisation of the second metric terms
685        k2AtC and k2AtZ: k2AtC was set to the value of k2AtZ and k2AtZ was 0.
686      - this affects all seaice configurations with useCurviLinearGrid = .true.
687        and SEAICEuseDynamics = .true. (default) and SEAICEuseMetricTerms
688        = .true. (default)
689      - the only verification experiment affected is global_ocean.cs32x15:
690        icedyn, seaice, and seaice_dynmix (AD)
691    o pkg/thsice/thsice_diagnostics_state.F
692      - only for TARGET_NEC_SX: initialise all of tmpFld, so that overlap does
693        not contain garbage that can lead to surprises in diagstats_calc.F
694    o model/src:
695      - move bi,bj loops inside INTEGR_CONTINUITY ;
696      - call INTEGR_CONTINUITY directly from forward_step.F
697        (previously called from momentum_correction_step.F)
698      - call UPDATE_ETAH from integr_continuity.F and update initialise_varia.F,
699        forward_step.F and pkg/ecco/the_main_loop.F
700    o model/src/do_oceanic_phys.F:
701      - reset addMass to zero only if useICEFRONT ;
702      - separated k-loop for rhoInSitu calculation ;
703      - add 2 diagnostics for wVel*delta^k(Rho) at constant pressure (= WdRHO_P)
704        and at constant T,S (= WdRHOdP);
705      NOTE: change diagnostics WRHOMASS : this is now simply the Vertical transport
706        of In-Situ Density (Anomaly) (=wVel*rho^bar-k) (previously was Vertical
707        transport of locally-referenced potential density);
708        to recover old diag: (WRHOMASS)_old = (WRHOMASS)_new -1/2 * (WdRHOdP)
709    o gluemnc:
710      - replace ncrcat with ncks when adding variables to *.glob.nc
711      - change the way variables without record dimensions are handled so that
712        files that have variables with and without record variables can be glued:
713        add a record dimension with a new unique name to be able to differentiate
714        between variable with and without a-prior record dimensions. Remove
715        this record dimension before adding the variable to the *.glob.nc file.
716        This procedure automatically works also for grid.*.nc files that do not
717        have any record dimension.
718    o verification/cpl_aim+ocn:
719      - generate new reference output on baudelaire (gfortran, mpich2) (previously
720        from old aces-grid cluster, ao + ifort) and update 'run_cpl_test' script.
721    o pkg/obcs/obcs_calc_stevens.F:
722      - add code for northern and southern boundaries.
723      - reorder some loops to save some operations and so that drFBar can be scalar
724    o model/src:
725      - re-arrange extrapolation calculation in Adams-Bashforth S/R (affects machine
726        truncation) and add diagnostics for Adams-Bashforth tendency increment.
727      - update test-exp. AD output:
728        1D_ocean_ice_column, bottom_ctrl_5x5, lab_sea.noseaicedyn, obcs_ctrl;
729      and FWD output: exp4 (x3), fizhi-cs-32x32x40, fizhi-cs-aqualev20,
730        front_relax (x3), global_ocean.90x40x15 (x2), global_ocean.cs32x15 (x5),
731        global_ocean_ebm, ideal_2D_oce, internal_wave, isomip (x3), lab_sea (x4),
732        matrix_example, MLAdjust (x5), natl_box (x2), tutorial_advection_in_gyre,
733        tutorial_global_oce_in_p, tutorial_global_oce_latlon and
734        tutorial_plume_on_slope.
735    o pkg/diagnostics/diagstats_calc.F: add special code for TARGET_NEC_SX
736      that vectorises. This code uses 3 extra 2D fields, F90 array assignments
737      and F90 intrinsic routines SUM, MINVAL, MAXVAL, but since TARGET_NEC_SX
738      does not even come with an F77 compiler anymore, this should not be
739      a limitation
740    
741    checkpoint63e (2011/11/06)
742    o pkg/seaice adjoint of LSR:
743      - substantially rework STORE dirs.
744      - add new flag SEAICE_LSR_ADJOINT_ITER and parameter SOLV_MAX_FIXED
745        this flag will do SOLV_MAX_ITERS but only store SOLV_MAX_FIXED fields
746        and only perform SOLV_MAX_FIXED adjoint iters.
747        If flag SEAICE_LSR_ADJOINT_ITER is undef-ined, the store in the iteration
748        always goes to same record, meaning that the last forward field will be
749        the one used in the adjoint - an approximation.
750      - now produces non-zero LSR-related gradients, and acceptable gradients for
751        An's zonal (x-z) test case (to be checked in)
752      - lab_sea: produces acceptable gradients for lab_sea with forward/backward LSR
753        (but these are screwed up by the thermodynamics in the first place);
754        reduce from 4 to 3 timesteps to avoid t.d. issue as temporary solution;
755        output_adm.txt also reflects changes to seaice_lsr
756      - global_ocean.cs32x15:
757        * the "default" input_ad.seaice has been re-defined to always exclude dynamics
758          (output_adm.seaice.txt was updated)
759        * new input_ad.seaice_dynmix tests a forward LSR / backward free-drift
760          (output_adm.seaice_dynmix.txt)
761    o test-exp. exp4+stevens:
762      - switch off pTracers and nonHydrostatic (restart problems with NH); update output
763    o pkg/seaice (lsr solver):
764      - put coriolis term into FORCEX,Y (as in seaice_evp.F; previously in rhsU,V only);
765        update output (change truncation) of FWD test exp lab_sea & global_ocean.cs32x15
766      - fix SEAICEuseFREEDRIFT for new OBCS version (ndef OBCS_UVICE_OLD)
767      - new parameter "LSR_mixIniGuess" allows (if=2,4) to mix free-drift solution
768        into initial guess for linearised solver; use weight ~ (1/err)^2,4.
769      - compute (with new S/R) and print initial (+ free-driff sol. if available)
770        and final residual of linearised system.
771  o pkg/pp81: add diagnostics for vertical eddy viscosity and diffusivity  o pkg/pp81: add diagnostics for vertical eddy viscosity and diffusivity
772    (requires new subroutines pp81_init_fixed.F/pp81_diagnostics_init.F)    (requires new subroutines pp81_init_fixed.F/pp81_diagnostics_init.F)
773  o pkg/obcs: Stevens BCs (still only for east and west)  o pkg/obcs: Stevens BCs (still only for east and west)
774    - fix Stevens BCs by using intermediate velocities of previous    - fix Stevens BCs by using intermediate velocities of previous
775      time step as "baroclinic" contribution rather velocity of one grid cell      time step as "baroclinic" contribution rather velocity of one grid cell
776      inside the boundaries; more consistent but makes the entire treatment      inside the boundaries; more consistent but makes the entire treatment
777      more complicated, requires new pickup files and two new S/Rs:      more complicated, requires new pickup files and two new S/Rs:
778      obcs_copy_uv_n and obcs_save_uv_n      obcs_copy_uv_n and obcs_save_uv_n
779      keep old version with flag OBCS_STEVENS_USE_INTERIOR_VELOCITY      keep old version with flag OBCS_STEVENS_USE_INTERIOR_VELOCITY
780      (undefined by default)      (undefined by default)
781    - silently move computation of some grid factors into separate loops to    - silently move computation of some grid factors into separate loops to
782      save some recomputations      save some recomputations
783    - add a hack for non-linear free surface    - add a hack for non-linear free surface
784    - add a verification experiment to exp4 that tests this code    - add a verification experiment to exp4 that tests this code
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