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revision 1.1744 by dimitri, Tue Sep 25 16:39:20 2012 UTC revision 1.1833 by mlosch, Thu Feb 28 17:17:29 2013 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/seaice:
8      - add another averaging method for etaZ (etaZmethod=3), a mix of 2 and 0
9      - add runtime parameter SEAICE_JFNKepsilon for that finite difference
10        gradient in the Jacobian times vector operation (s/r seaice_jacvec)
11      - fix line search in seaice_jfnk.F (s/r seaice_jfnk_update)
12    o pkg/seaice: reorganize seaice_lsr.F to be able to reuse more code:
13      - new subroutines seaice_lsr_tridiagu/v
14      - introduce loop bounds i/jmin/max to be able to use a restricted
15        additive Schwarz method, but not used for now.
16      - rename SEAICE_CALC_LSR_COEFFS into SEAICE_LSR_CALC_COEFFS
17      - use new subroutines seaice_lsr_tridiagu/v in s/r seaice_preconditioner
18    o OpenAD support
19      Reorganize S/R call for overall time-stepping loop to facilitate
20      OpenAD revolve loop replacement
21      (new S/R main_do_loop.F)
22    o model/src:
23      - add 3-D array 3rd dimension to argument list of S/R ADAMS_BASHFORTH2/3;
24      - pkg/cheapaml: remove local S/R ADAMS2d and use instead standard S/R
25        ADAMS_BASHFORTH2.
26    o pkg/cheapaml:
27      - add new parameter (default=F, same as before) to disable full domain
28        (including land) periodicity in X & Y dir.
29      - new S/R CHEAPAML_COPY_EDGES to copy relaxation field into edges of
30        prognostics field ; merge the 2 S/R cycle_2d_tracer and timestep_2d_tracer
31        into single S/R CHEAPAML_TIMESTEP.
32    
33    checkpoint64d (2013/02/17)
34    o pkg/monitor (angular momentum):
35      - do not add Eta contribution to the total AM if using rigid-lid;
36      - correct for Adams-Bashforth in zonal-wind part (instead of in AM_eta).
37      - horizontal discretisation: compute Zonal wind contribution separately for
38        each component (instead of from cell centered averaged) and use the 4
39        grid-cell corner averaged value of Omega*(R*cos_Phi)^2 in AM_eta part.
40      - Check that AM is conserved with linear dynamics (momAdvection=F and linear
41        FreeSurf) if using vectorInvariant momentum.
42    o model/src (horizontal grid):
43      - move initialisation of all horizontal grid arrays to null value
44        from specific horizontal grid S/R to main S/R INI_GRID;
45      - add 2 new arrays to project model C-grid velocity on to zonal direction
46        (similar to AngleCosC & -AngleSinC but at U and V point location) and
47        compute them in S/R CALC_GRID_ANGLES.
48    o pkg/seaice: replace a hard coded parameter by a runtime parameter
49        SEAICE_JFNK_tolIter
50    o pkg/seaice: introduce a restricted additive Schwarz (RAS) method in
51        preconditioner for JFNK (run LSR into the overlaps as far as possible,
52        i.e OLx/y-2, but overwrite the solution in the overlaps)
53      - extend loop range in seaice_calc_viscosity
54      - add new parameters SEAICE_OLx/y (default = OLx/y-2)
55      - add flexible loop ranges to seaice_preconditioner, seaice_calc_lsr_coeffs
56      - slightly modify loops in tridiagonal solver lsr-preconditioner
57      - by default remove the extra exchange in seaice_preconditioner with a
58        replacement of an undocumented CPP flag by SEAICE_PRECOND_EXTRA_EXCHANGE
59      - modify offline_exf_seaice so that old results without RAS are reproduced
60        for output.dyn_jfnk.txt
61      in seaice_fgmres.F (unrelated to RAS)
62      - add a cpp-flag option for a re-ordered mapping (potentially more
63        efficient), but because this changes the results, turn it off by
64        default
65      - replace the save statement by local common blocks
66    o utils/matlab:
67      - fix tile-offset in rdmnc.m when output was produced using EXCH2.
68      - update cs_grid/bk_line scripts to use load_grid.m (in utils/matlab)
69        instead of local script "load_cs.m".
70    o pkg/seaice:
71      - fix a serious bug in seaice_fgmres.F, s/r seaice_scalprod, connected
72        to the scalarProductMetric and the unrolling. By chance this does not
73        change the verification experiment, because of the particular domain
74        decomposition
75    o pkg/diagnostics:
76      - change default missing_value from UNSET_RL to -999.
77    o pkg/layers: improve vectorization of layers_fluxcalc.F
78      - step 1: split loops, make TatU/V 2D arrays. This alone reduces the cpu
79        time spent in this routine by more than a factor of 3 on an NEC-SX8
80      - step 2: replace search algorithm by a bisection algorithm found in
81        Press et al. Numerical Recipes in Fortran. This algorithm can be
82        vectorized and finds the correct bin in approx. log2(Nlayers) steps.
83        For now, use this algorithm only for TARGET_NEC_SX defined.
84      - moved the search algorithm into a separate subroutine, that is kept
85        within the same file for automatic inlining.
86      - modified catching potential errors
87    o pkg/ecco:
88      - add compile switches ALLOW_SHALLOW_ALTIMETRY and ALLOW_HIGHLAT_ALTIMETRY.
89    o model/src, pkg/autodiff, pkg/ctrl, pkg/grdchk :
90      - modifications for ALLOW_GENTIM2D_CONTROL
91      -- forward_step.F, the_main_loop.F : pass options and arrays for adjoint tapes.
92      -- load_fields_driver.F : add call to CTRL_MAP_GENTIM2D( myTime, myIter, myThid )
93      -- add xx_gentim2d0/1 in ctrl_ad_check_lev1_dir.h checkpoint_lev1_directives.h etc
94      -- use ctrl_swapffields.F (new) instead of exf_SwapFFields.F in ctrl_get_gen.F
95    o model/src:
96      - account for moist thermodynamics in (dry) potential temperature equation;
97        update results of experiments: aim.5l_cs (x2), fizhi-cs (std + aqualev)
98        and cpl_aim+ocn.
99      - also switch to standard compiler (gfortran, was using ifort previously)
100        for fizhi-cs experiments reference output.
101    o pkg/ctrl:
102      - 1st step toward generic time-varying control variable (2D) via CPP option
103        ALLOW_GENTIM2D_CONTROL
104      - note new namelist ctrl_nml_genarr in data.ctrl
105    o verification/global_ocean.cs32x15:
106      - switch off OLD_THSICE_CALL_SEQUENCE (both forward and AD code) to use new
107        thsice calling sequence and update "output.icedyn.txt" output file.
108    o pkg/ptracers:
109      - from Ryan A.: code to allow to restart a tracer at regular time interval
110        specifying a reset frequency and a reset-phase (for each tracers).
111    o pkg/thsice:
112      - implement new sequence of calls for thsice+seaice:
113          previously:   ice-Dyn,ice-Advect,ice-Thermo(thsice)
114          new sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect
115      - allows (with temporary CPP option "#define OLD_THSICE_CALL_SEQUENCE"
116        in CPP_OPTIONS.h) to recover old sequence;
117      - update diagnostics for Intermediate State thsice diagnostics: now filled
118        just before advection (instead of just after advection in old sequence);
119      - update output of experiment offline_exf_seaice (standard test);
120      - in global_ocean.cs32x15 exp., postpone output.icedyn.txt update
121        by setting #define OLD_THSICE_CALL_SEQUENCE in CPP_OPTIONS.h
122    o pkg/aim_v23:
123      - use tiled array for aim_CO2 and surface wind speed for export to coupler;
124      - use standard pkg/mdsio routines to read & write CO2 pickup file;
125      - in-line S/R AIM_AIM2DYN_EXCHANGES in aim_do_physics.F;
126      - Implement new sequence of calls for seaice advection (with thsice and
127        seaice diffusion): do ice advection after ice-Thermodynamic (previously
128        was done before); change aim_do_physics.F (split the bi,bj loops block);
129      - use same CPP option (OLD_THSICE_CALL_SEQUENCE) to recover old sequence;
130    o pkg/thsice:
131      - add a missing EXCH of sIceLoad in thsice_main.F (ocean set-up) for the case
132        where just seaice diffusion is used without seaice-dynamics.
133    
134    checkpoint64c (2013/01/18)
135    o pkg/seaice:
136      - add a parameter JFNKres_tFac that can replace JFNKres_t
137        (= JFNKres_tFac*JFNKresidual before JFNK solver)
138      - add a line search option to the JFNK solver
139      - move update of u/vIce and computation of initial residual into a separate
140        routine (same file); makes the code a little easier to read (?)
141      - the line search requires computation of the residual and for some reason
142        I cannot do the update of u/vIce at the beginning of the Newton loop
143        without changing the results, so we move computation of the new residual
144        also to the end of the Newton loop, even without the line search
145    o pkg/mdsio:
146      - write missing value (corresponding to undefined array value) to meta files;
147        skip this if missing value is one (UNSET_RL would be a better value for the
148        case of undefined missing value but it's current the default missing-value);
149        Also update mdsio_read_meta.F (reading timeInterval & missing-value).
150    o pkg/exf & thsice:
151      - for diagnostics purpose, fill-up and update Qsw array (+ fill the
152        diagnostics) even when SHORTWAVE_HEATING is #undef;
153    o verification/cfc_example:
154      - turn on pkg/layers with pkg/diagnostics (to test pkg/layers and to
155        illustrate how to use it).
156    o verification/offline_exf_seaice:
157      in input: add SEAICErestoreUnderIce=.TRUE., and reduce size of forcing
158        files to only one time-record.
159      in input.thermo: narrow the 2 bands of low initial ice-concentration near
160        N & S edges; switch on SEAICErestoreUnderIce=T; use pkg/diagnostics for
161        snapshot output; same mcPheePiston value as in thsice with
162        surf-current=0.2m/s.
163      in input.thsice: similar set-up as in input.thermo (channel with same seaice
164        initial conditions).
165    o verification/cfc_example:
166      - update file "data" with more standard choice (default rotationPeriod,
167        exactConserv=T, reduce ivdc_kappa to 10, remove multiDimAdvection=F,
168        set deltaTFreeSurf to deltaTtracer) and update the output.
169    o pkg/layers:
170      - fix bolus part so that it compiles with #undef GM_BOLUS_ADVEC;
171      - ensure that "layers_bolus" is switched to False when useGMRedi=False.
172    o verification/offline_exf_seaice:
173      - set all {field}period to zero for constant-in-time forcing (not tested
174        anywhere else).
175    o verification/offline_exf_seaice:
176      - dyn_lsr  : use pkg/seaice S/R (instead of pkg/thsice) to advect sea-ice;
177      - dyn_jfnk : use pkg/thsice S/R (instead of pkg/seaice) to advect sea-ice.
178    o model/src:
179      - implement Finite-Volume method for (hydrostatic) presure gradient
180        from S.-J. Lin (QJRMS 1997), for atmosphere using sigma-coordinate.
181    o pkg/seaice: implement EVP* by Lemieux et al. (2012).
182      - In order to be compatible with the default EVP code, this requires changing
183        the EVP code around a little; and because any small change immediately
184        breaks the lab_sea.hb87 verification experiment, the reference output is
185        updated two times (each time the remaining aggrement was only 2 digits):
186        - after replacing 1/dt by 1*recip_dt with a precomputed recip_dt
187        - after replacing 1/(1+0.5*dt/tau) by a/(a+1), with a=2*tau/dt
188        The adjoint test lab_sea.evp also needed to be updated.
189      - Turn on EVP* by setting SEAICE_deltaTevp as before, and setting
190        SEAICEuseEVPstar=.true.; for EVP* SEAICE_deltaTevp does not need to be
191        a factor of SEAICE_deltaTdyn, and you can set the number of EVP steps
192        explicitly with SEAICEnEVPstarSteps (thereby overriding the default of
193        INT(SEAICE_deltaTdyn/SEAICE_deltaTevp)). Controlling EVP* is deliberately
194        kept obscure, because I need to test it a little more.
195    o pkg/cheapaml:
196      - fix few incorrect type (_RL/_RS) in subroutine calls.
197    o pkg/seaice:
198      - new S/R SEAICE_MAP_RS2VEC (similar to SEAICE_MAP2VEC) to map _RS arrays
199        to _RL vector; this fixes JFNK code when compiling with "-use_r4" option.
200    o model/src:
201      - add a warning if using select_rStar=2 with nonlinFreeSurf <> 4;
202        change (in input_ad*/data) select_rStar from 2 to 1 for AD verification
203        experiments global_ocean.cs32x15 & tutorial_tracer_adjsens (+ update output)
204    o pkg/cheapaml:
205      - replace "273.1 _d 0" by celsius2K in pkg/cheapaml/cheapaml.F and
206        update output of experiment cheapAML_box.
207      - store in CHEAPAML.h coeffs ssq[0:2] for saturation specific humidity,
208        and set them only in one place (cheapaml_readparms.F).
209      - replace "273.16 _d 0" by celsius2K & replace "3.14159 _d 0" by constant "PI"
210      - remove re-setting of main-model parameter "celsius2K" (in cheapaml_readparms)
211        and re-setting of cheapAML params "lath" & "p0" (in cheapaml_init_varia).
212    o model/src/the_main_loop.F:
213      - fix revision 129 : need both ALLOW_ECCO and ALLOW_ECCO_EVOLUTION.
214    o pkg/seaice:
215      - remove legacy branch code.
216      - retire SEAICE_GROWTH_LEGACY and SEAICE_CAP_HEFF accordingly.
217    o verification/*/code*/SEAICE_OPTIONS.h:
218      - remove documentation for retired CPP flags (SEAICE_GROWTH_LEGACY,
219        SEAICE_CAP_HEFF).
220    o pkg/cheapaml:
221      - use standard routine (S/R GET_PERIODIC_INTERVAL) to decide when it is time
222        to load new forcing fields.
223      - add missing "_d 0" where it's needed; + some editing (improve indentation).
224      - remove switch to "-r8" compiler option (no longer needed) in verification
225        cheapAML_box, keep same output (small trucation error differences).
226    o verification/offline_exf_seaice:
227      - add thermodynamics only test.
228    o verification/cheapAML_box:
229      - split the domain in 8 (2x4) tiles; add MPI and multi-threaded test;
230        keep same output (same 14 digits for cg2d).
231      - switch on "-r8" compiler option (some numerical values are missing
232        the "_d 0") and update output (only 6 digits for cg2d were preserved).
233    
234    checkpoint64b (2012/12/24)
235    o pkg/cheapaml:
236      - remove un-used variables (Qnet,EmPmR) from pickup files.
237      - store tendency of advected variables into cheapaml pickup file
238        and fix the AB-2 restart.
239    o verification/offline_exf_seaice and lab_sea adjoint:
240      - switch to new code (#undef SEAICE_GROWTH_LEGACY).
241      - switch to 4 time steps in offline, consistent with lab_sea.
242      - match parameters from SEAICE_GROWTH_LEGACY branch in data.seaice.
243      - update results after change of experiment seaice.
244    o pkg/seaice:
245      - remove option SEAICE_MULTICATEGORY; has been replaced with run-time
246        parameter SEAICE_multDim. Issue a warning if SEAICE_MULTICATEGORY is
247        still defined since SEAICE_multDim needs to be set to MULTDIM value (from
248        SEAICE_SIZE.h) to recover previous #define SEAICE_MULTICATEGORY default.
249    o model/src:
250      - add run-time parameter to select CG2D solver minimum-residual solution
251        (in case of a poor convergence).
252    o pkg/seaice/seaice_lsr.F
253      - move calculation of matrix coefficients into new
254        S/R SEAICE_CALC_LSR_COEFFS; for now this routine remains in the same
255        file; the main purpose of this change is to be able to reuse the code
256        in S/R SEAICE_PRECONDITIONER
257      - modify the computation of the residual so that the mass of sea-ice
258        is not used twice; this simplifies the calculations, but since
259        the residual is never used except when LSR_mixIniGuess.ge.4---and this is
260        not tested in testreport---this does not affect the testreport results.
261    o verification/seaice_obcs:
262      - disable SEAICE_GROWTH_LEGACY; reset input files to match those of
263        verification/lab_sea/input.salt_plume; changes results/output.txt*
264    o model/src:
265      - adapt quasi-hydrostatic formulation to work with p or p* coordinate.
266    o pkg/seaice:
267      - improve description of parameters in seaice_fgmres.F and start
268        cleaning up the code
269      - change name of SCALPROD to SEAICE_SCALPROD and modify meaning of
270        second argument
271      - add a metric based on grid cell area to SEAICE_SCALPROD; update
272        results of offline_exf_seaice.dyn_jfnk
273      - compute initial residual norm in seaice_jfnk based on SEAICE_SCALPROD
274    o pkg/aim_v23:
275      - fix an other bug in dissipation heating (grid-cell area was missing).
276    o model/src + pkg/seaice:
277      - add global (multi-tile) linear solver for pair of tri-diagonal system
278        along X and Y lines, respectively for U and V component.
279        Note: 1) MPI and cube-exchange not yet coded.
280            2) probably not accurate for poorly conditioned / large size problem.
281      - add option for SEAICE_LSR to use global (multi-tile) tri-diagonal solver;
282        default: not compiled and not used.
283    o pkg/seaice:
284      - first attempt at a multi-threaded fgmres solver for the JFNK solver:
285        introduce bi/bj loops and use global_sum_tile_rl instead of
286        mpi_allreduce in seaice_fgmres.F
287      - improve diagnostics output for fgmres solver (seaice_fgmres.F)
288      - replace a few unnecessary goto statements by if-blocks  (seaice_fgmres.F)
289      - add a verification experiment for JFNK in offline_exf_seaice
290    o verification:
291      - change (for now, only fwd test) offline_exf_seaice experiment:
292        use a re-entrant channel with idealized coastline (trapezoidal shape)
293        at southern boundary to explore seaice dynamics and thermodynamics
294        with simple forcing. Main set-up has dynamics+thermo and SST relaxation;
295        secondary test (input.thsice) use thermodynamics only with SST relaxation.
296      - add seaice-dynamics only secondary test using LSR and pkg/thsice advection.
297    o pkg/exf:
298      - disable "sstExtrapol" when Nr=1
299    o verification:
300      - add new experiment "cheapAML_box" (simple 1 layer set-up from Bruno Deremble)
301        to test pkg/cheapaml.
302    o pkg/aim_v23 & pkg/shap_filt:
303      - fix dissipation heating (erroneous gravity multiplication factor).
304    o pkg/seaice:
305      - remove unused field pressPre from jfnk solver
306      - rename two subroutines in seaice_preconditioner.F
307    o eesupp/src:
308       - S/R MDSFINDUNIT avoids reserved unit numbers (scrUnit1, eeDataUnit ...)
309    o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again
310       - remove wrong parts of the rhs and the lhs (were in there
311         because I did not understand the concept of this preconditioner)
312       - add an exchange between u- and v-sweep. This increases communication
313         by a factor of two but improves the convergence of jfnk. Ideally,
314         one would like the u- and v-sweep to be independent. So far within
315         undocumented ifdefs
316       - reorganize the extra computations for printing the residuals
317    o tools/genmake2:
318      - comment out the "mpif.h" include in NetCDF test programm (for MPI built)
319        since it's not necessary (and was preventing to use MNC in some cases).
320    
321    checkpoint64a (2012/11/16)
322    o pkg/autodiff:
323      - improve pkg-internal logical parameter switch (inAd/inFwd mode) so that
324        autodiff_readparms.F no longer depends on calling order (within
325        packages_readparms.F) and no longer requires to include ${PKG}_PARMS.h):
326        rename param turnFreeDriftInAdMode to SEAICEuseFREEDRIFTswitchInAd
327        and change param SEAICEuseDYNAMICSinAdMode to SEAICEuseDYNAMICSswitchInAd.
328    o pkg/obcs:
329      - adding tidal velocity forcing capability to obcs
330        for usage example, see verification/seaice_obcs/input.tides
331    o pkg/seaice:
332      - turn the LSR-relaxation parameters WFAU/V into runtime parameters
333        SEAICE_LSRrelaxU/V
334      - introduce runtime parameter SEAICEetaZmethod (=0 by default)
335    o pkg/aim_v23:
336      - implement heating from friction (bottom friction and stratospheric drag).
337    o pkg/shap_filt:
338      - fix diagnostic "SHAP_dKE" (was 2 time smaller); implement heating from
339        dissipation but only for Shap_funct=2, active when addFrictionHeating=T.
340    o model/src:
341      - move AddMass common block from DYNVARS.h to FFIELDS.h; allow to read-in
342        time-constant addMass field from file (addMassFile);
343      - support for heating due to friction (and Kinetic Energy dissipation):
344        add option, run-time switch and 3-D field array + support code ; each pkg
345        or S/R can add heating contribution (if there is a sink of KE); the sum is
346        accounted for as a Temperature tendency term (EXTERNAL_FORCING_T).
347    o pkg/seaice:
348      - complete merge of ITD code into seaice_growth.F
349        from MITgcm_contrib/torge/itd/code/
350        no verification so far, but Torge Martin tested
351        "1-D test case and Beaufort set up;
352        deliver okay results after 1 model year."
353      - complete merge of SEAICE_SIZE.h into all relevant routines
354      - move computation of eta at Z-points into calc_viscosities
355        + introduce global field etaZ
356        + add different methods for computing etaZ, for now the old
357          method (simple averages of eta to Z-points) is hardwired
358        + replace etaMeanZ by etaZ in seaice_lsr, seaice_calc_residual,
359          seaice_preconditioner
360      - simplify computations for SEAICE_ZETA_SMOOTHREG
361      - seaice_preconditioner:
362        + replace one remaining press by pressLoc (mistake)
363        + adjust printing of residuals
364      - improve I/O of diagnostics of JFNK in seaice_jfnk.F:
365        + add (SEAICE.h) and rename some counters (initiliased in
366          seaice_init_fixed.F)
367        + add _BEGIN/END_MASTER (myThid)  around print statements
368        + print total number of iterations and failures over SEAICE_monFreq
369          interval to STDOUT
370      - move control over output-messages by fgmres to seaice_jfnk to save
371        some operations
372      - move resetting initial guess for fgmres outside of seaice_fgmres_driver
373        in order to make restarts with sol .ne. zero (fgmres with restarts)
374        (seaice_jfnk.F, seaice_fgmres.F)
375      - seaice_calc_l/rhs.F: replace maskW/S by maskInW/S; this fixes
376        a serious convergence problem when open boundaries are involved
377    o pkg/ggl90: fix computation of control volumes for the case of
378      ALLOW_GGL90_HORIZDIFF (probably not used very often): move control volumes
379      up half a grid cell from C-centered to W-centered (pointed out by C. Eden)
380    o pkg/seaice: simplify seaice_evp by avoiding use of extra fields u/vIceC
381    o pkg/autodiff
382      - Add inAdMode switch for SEAICEuseDYNAMICS:
383        SEAICEuseDYNAMICSinAdMode
384        (extend logic in ADAUTODIFF_INADMODE_SET)
385    o pkg/seaice
386      - Step 1 of merging ice-thickness distribution (ITD) code from
387        MITgcm_contrib/torge/itd/ (author: Torge Martin)
388        The code implements concept laid out in Thorndike et al. (1975);
389        code is enabled via CPP flag SEAICE_ITD
390        nITD (in SEAICE_SIZE.h) defines number of ice thickness categories;
391        code is not complete yet!!
392      - SEAICE_SIZE.h now included in almost all seaice routines
393    o verification (using seaice):
394      - switch back seaice-dynamics (+ lower SOLV_MAX_ITERS) in ADM exp.
395        global_ocean.cs32x15.seaice ; update results.
396      - compile B-grid dynamics in FW test exp 1D_ocean_ice_column ;
397      - compile C-grid dynamics with #define SEAICE_ALLOW_JFNK in FW test exp
398        offline_exf_seaice (previously compiling B-grid).
399    o pkg/exf:
400      - fix some STOP conditions in exf_check.F (from Aug 28, modifs did not allow
401        to specify neither just 1 comp of wind or wind-stress, nor no surface momentum
402        forcing): just replace CPP option ALLOW_ATM_WIND with run-time param useAtmWind.
403    o pkg/layers (adjust changes from Sept 19):
404      - do snap-shot output and fill diagnostics from inside iLa loop (layers_calc.F)
405        this allows to remove "layers_maxNum" dimension from all layers arrays.
406    o pkg/layers (adjust changes from Sept 19):
407      - remove ALLOW_LAYERS_OUTPUT ; fix snap-shot and time-ave output ;
408      - snap-shot extended to all type of layers (not just the 1rst type);
409      - remove layers variables when corresponding CPP option is undef.
410    o pkg/layers:
411      - rename pkg/layers variable and add new output (layer exist & un-weighted
412        velocity in layer)
413    o pkg/seaice:
414      - simplify (?) ocean-drag coefficent computations by using
415        the same routine in all three solvers (saves some code lines)
416      - remove global fields DRAGA and DRAGS from C-grid code and
417        declare them locally in lsr.F (the only place where they are
418        still used)
419      - update AD output of lab_sea.evp (very sensitive anyway).
420    o pkg/seaice: add Jacobian-free Newton Krylov solver for ice dynamics
421      (Lemieux et al. 2010, 2012). Turn on with the usual SEAICE_ALLOW_JFNK
422      and SEAICEuseJFNK=.true. A few things to note:
423      - involves a FGMRES, that is parallel but very inefficient,
424        because of many scalar products (global sums) in the Gram-Schmidt
425        orthogonalization method. Needs to be replaced. Original code
426        from J.-F. Lemieux
427      - preconditioner for FGMRES is a stripped down version of LSOR
428      - SOLV_MAX_ITERS is now used for LSOR as a solver and as a
429        preconditioner. For the preconditioner, the default is set to 10.
430      - Jacobian times vector is computed with finite differences
431      - marginally related to JFNK-solver: add a smooth regularization for
432        zeta with tanh that will improve convergence (Lemieux and Tremblay,
433        2009) for any implicit solver (not implemented for EVP because EVP
434        does not need this regularization in the first place). Define
435        SEAICE_ZETA_SMOOTHREG in SEAICE_OPTIONS.h to use.
436    o eesupp/src:
437      - check in genmake2 that intrinsic S/R flush is available.
438      - add S/R to flush IO unit (if intrinsic S/R flush is available)
439      - flush standard & error msg unit before MPI termination
440      - if debugMode, flush IO unit after printing msg
441    o pkg/ctrl:
442      - ctrl_unpack.F, ALLOW_GENARR3D_CONTROL code: fix missing argument in call
443        to ctrl_set_unpack_xyz.
444    
445    checkpoint64 (2012/10/09)
446    o pkg/shelfice
447      - in mom_fluxform.F, mom_vecinv.F:
448        CALL SHELFICE_V_DRAG(bi,bj,k,vFld,KE,KappaRU,vF,myThid)
449        Bug fix KappaRU -> KappaRV
450        does not change verification/isomip but may change other setups
451        (presumably constant KappaRU=KappaRV)
452      - fix diagnostics SHIU/Vdrag (thanks to Tom Millgate)
453  o pkg/obcs:  o pkg/obcs:
454    - fixed some indexing bugs in obcs_seaice_sponge.F    - fixed some indexing bugs in obcs_seaice_sponge.F
455    - added obcs relaxation subroutines for HSALT and HSNOW    - added obcs relaxation subroutines for HSALT and HSNOW

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