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revision 1.1743 by mlosch, Mon Sep 24 15:07:38 2012 UTC revision 1.1913 by jmc, Sun Aug 18 20:24:49 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/exf:
8      - in exf_getforcing.F: comment out most of the EXCH calls (fields used by
9        main model or other pkgs are exchanged in EXF_MAPFIELDS).
10    o model/src:
11      - do_stagger_fields_exchanges.F: skip EXCH calls when using pkg/offline
12        (similar to do_fields_blocking_exchanges.F).
13    o tools/genmake2:
14      - remove TAF output src code just before calling staf (when not doing a fresh
15        built, will stop if things go wrong with staf).
16      - fix target "adobj" (left from TAF version-2 transition)
17    o pkg/diagnostics:
18      - add a parameter to track the status of pkg/diagnostics activation;
19        this replace/extend the use of logical param "settingDiags" (to check
20        when adding diag to the list) to also check any DIAGNOSTICS_[]FILL* call.
21        New S/R to print error message and stop when pkgStatus is not right.
22      - to try: add a warning when "data.diagnostics" exist but useDiagnostics=F.
23    
24    checkpoint64m (2013/08/13)
25    o model/inc:
26      - move FCORI_MACROS.h from PARAMS(_MACROS).h to GRID_MACROS.h (left from
27        8 yrs ago modif when Coriolis arrays were moved from PARAMS.h to GRID.h)
28    o pkg/kpp & aim_v23:
29      - only call DIAGNOSTICS_FILL when useDiagnostics=TRUE.
30    o pkg/seaice:
31      - restore (last time on 2011/12/24) ability to compile pkg/seaice with
32        undefined pkg/exf ALLOW_ATM_TEMP or ALLOW_RUNOFF CPP-options.
33      - only call DIAGNOSTICS_FILL when useDiagnostics=TRUE.
34    o eesupp/src:
35      - fix check for overlap-size argument (myOLn.GT.MAX_OLY_EXCH)
36        in exch1_rx[_ad].template (thanks to Francois Lefeuvre report).
37    o switch to TAF version-2:
38      - add flow directives to "freeze" naming convention for ad-routines that
39        are used in I/O routines of adjoint state and associated common blocks
40        that are used in adcommon.h (backward compatible with version-1)
41      - update all ad-optfiles (in tools/adjoint_options + few local to some
42        verification exp) to switch to latest TAF version (currently 2.5.5);
43        merge "*_mpi" adoptfiles into the corresponding non-mpi (but commented
44        out except for diva).
45      - the major change with TAF version-2 is that both the differentiated
46        routines and the forward routines (new) are returned as part of the TAF
47        output source code. Update genmake2 accordingly.
48      - new output for AD experiment tutorial_global_oce_biogeo (better AD gradient
49        with version-2 when compared to TLM or FWD gradient); other experiments
50        output show minor changes (machine truncation level); update the few AD &
51        TLM output with 12 matching digits only (some prior to version-2 switch).
52    
53    checkpoint64l (2013/08/05)
54    o model/src:
55      - in dynamics.F, skip the call to CALC_VISCOSITY if momViscosity=F
56      - main_do_loop.F: no longer includes additional (AUTODIFF) header files
57        when using TAF but only if using OpenAD.
58    o pkg/mom_common+fluxform+vecinv:
59      - always set horiz. viscosity arrays to background value before calling
60        MOM_CALC_VISC (in MOM_FLUXFORM & MOM_VECINV) and call S/R MOM_CALC_VISC
61        only when using variable horiz. viscosity (useVariableVisc=T);
62      - simplify mom_vecinv.F (only 1 block for momViscosity).
63    o pkg/mom_common: variable horiz. viscosity in NH code
64      - move horiz-viscosity 3-D arrays viscAh_W & viscA4_W (used in calc_gw.F)
65        from model/inc/NH_VARS.h to pkg/mom_common/MOM_VISC.h
66      - store in common block (in MOM_VISC.h) logical parameters: useHarmonicVisc,
67        useBiharmonicVisc & useVariableVisc.
68      - fix old bug (already in 1rst implementation of variable horizontal viscosity
69        in calc_gw.F, version 1.27, 2006/06/20):
70        horizontal bi-harmonic viscosity in gW was missing when wiscA4W=0
71        even if variable bi-harmonic viscosity (e.g., viscA4Grid) was non-zero.
72      - change background horiz viscosity in vertical momentum (gW) to always be
73        viscAhW,viscA4W (instead of switching to viscAhD, viscA4D when using
74        any type of variable viscosity, e.g., viscAh/4Grid)
75      - change default value of viscAhW,viscA4W to viscAhD,viscA4D (instead of
76        viscAh,viscA4) which default to viscAh,viscA4 :  this avoid missing
77        horiz. viscosity in W eq when just setting viscAhD/Z,viscA4D/Z (since
78        default viscAh,viscA4 is zero).
79    o model/src:
80      - extend length of drC & recip_drC from Nr to Nr+1.
81    o Divided Adjoint (DIVA) with MPI:
82      - genmake2: do not create local ./mpi_headers dir when no file to copy into.
83      - remove option ALLOW_DIVIDED_ADJOINT_MPI (replaced by ALLOW_DIVIDED_ADJOINT
84        and ALLOW_USE_MPI) from model/src code and from ECCO_CPPOPTIONS.h.
85    
86    checkpoint64k (2013/07/23)
87    o tools/OAD_support:
88      - avoid the need for file "oadtempflile" in insertTemplateDir.bash
89        and remove it from genmake2.
90    o tools/build_options:
91      - remove MPI_HEADER_FILES_INC setting (no longer used) and comment out
92        MPI_HEADER_FILES list (let genmake2 find the missing headers)
93    o verification/halfpipe_streamice:
94      - change to driving stress formulation; update both Fwd & AD output.
95    o tools/genmake2 and Divided Adjoint with MPI:
96      - remove default setting of MPIINCLUDEDIR from $MPIHOME (always been broken);
97      - only create local ./mpi_headers dir if using MPI and MPIINCLUDEDIR is set;
98      - add new variable (LOCAL_MPI_HEADERS, replace MPI_HEADER_FILES_INC) in
99        Makefile, which is set by genmake2, and check which mpi-headers are needed.
100        Note: need to update adjoint_options/adjoint_diva_mpi accordingly.
101      - update target "CLEAN" (to also remove ./mpi_headers/ dir).
102    o testreport:
103      - changes for Divided Adjoint Run: when file "run_ADM_DIVA" is present,
104        perform additional runs (number of additional runs is "add_DIVA_runs" taken
105        from file run_ADM_DIVA ; should match "nchklev_3" in file "code_ad/tamc.h").
106    o verification/lab_sea (AD test):
107      - change to test Divided Adjoint Run in this set-up (both standard AD test
108        and 2 secondary AD test: noseaice + noseaicedyn); drop the evp AD test.
109    o pkg atm_ & ocn_compon_interf:
110      - remove cpl_earlyExpImpCall=F option (was mainly a hack added for the old
111        staggerTimeStep implementation) and disable (retired) corresponding
112        parameter.
113    o pkg/offline:
114      - comment out unused field-array: ICEM, ConvectCount, hflx[01], icem[01];
115      - add S/R OFFLINE_CHECK to print offline parameter summary
116        and stop if loading a file that is not used;
117      - enable to calculate GMRedi tensor, KPP mixing and convective index
118        when the corresponding file(s) is/are not specified (but pkg is used).
119      - comment out resetting of monitorFreq (to endTime) since it still useful
120        for monitoring CFL numbers and checking offline fields.
121    o OpenAD:
122      - do not define OAD_DEBUG (in tools/adjoint_options/adjoint_oad) to get
123        smaller standard output) and generate new (smaller) output (on baudelaire
124        using gfortran with -ieee) for exp. tutorial_tracer_adjsens
125    o model/src:
126      - call EXTERNAL_FORCING_SURF outside bi,bj loops (in do_oceanic_phys.F),
127        (where external_forcing_adjust was called) and change list of arguments;
128      - merge external_forcing_adjust.F into external_forcing_surf.F
129      - put surface relaxation of SST & SSS in new S/R (forcing_surf_relax.F)
130        which also contains balancing surface relaxation (ALLOW_BALANCE_RELAX,
131        previously in file "balance_relax.F", now removed); remove corresponding
132        arrays in FFIELDS.h.
133      - EXTERNAL_FORCING_SURF is now called when using pkg/offline; implement
134        a hack for getting back surfaceForcingS (loaded from file) when using
135        ALLOW_OLD_VIRTUALFLUX (pkg/dic, in DIC_OPTIONS.h) in offline set-up.
136      - update output of AD test experiment global_ocean.cs32x15.seaice_dynmix
137        (was getting only 11 digits for AD-grad, due to different truncation
138         error in AD code).
139    
140    checkpoint64j (2013/07/04)
141    o pkg/offline:
142      - to enable the use of other features with pkg offline (e.g., obcs),
143        also call S/R DO_OCEANIC_PHYS in offline run - more modifs to come.
144      - comment out "allowFreezing" (now active) in 2 offline testing exp.
145    o pkg/exf ALLOW_RUNOFTEMP
146      - fix sign and make compatible with temp_EvPrRn .NE. UNSET_RL
147      - ahdded RUNOFTEMP test to verification/global_ocean.cs32x15/input.seaice
148      - changes verification/global_ocean.cs32x15/results/output.seaice.txt
149    o pkg/atm_phys:
150      - allows to add some damping on uVel,vVel (strength only function of k).
151    o verification, ad-tests:
152      - reduce length of the simulation for AD test: global_ocean.cs32x15.seaice,
153        global_ocean_ebm and offline_exf_seaice.thsice.
154    o verification/halfpipe_streamice:
155      - found a bug in s/r pkg/streamice/streamice_advect_thickness which caused
156        flux input boundary conditions to be ignored; a fix for this bug changed
157        verification results for forward test.
158      - add adjoint test.
159    o pkg/ptracers:
160      - allow to restart without SOM pickup (resetting SOM to zero).
161    o pkg/gmredi:
162      - New parameterisation for the calculation of K and (GM_PsiX,GM_PsiY) added.
163      - It uses mixing length theory and suppression by steering level effects to
164        calculate a diffusivity used in the Redi tensor (see Bates et al., submitted
165        to JPO, for more details).
166      - It also uses the diffusivity to calculate an eddy induced streamfunction
167        based on a PV closure (rather than a buoyancy closure as in GM).
168      - New files added to pkg/gmredi:
169        gmredi_k3d.F calculates the diffusivity for the Redi tensor and the eddy
170          induced overturning streamfunction (called from gmredi_calc_tensor)
171        gmredi_calc_eigs.F calculates the eigenvalues and eigenvectors required
172          for use in gmredi_k3d
173        gmredi_calc_urms.F calculates the the rms eddy velocity used to calculate
174          the eddy diffusivity
175    
176    checkpoint64i (2013/06/18)
177    o pkg/cheapaml:
178      - take src files from MITgcm_contrib/verification_other/offline_cheapaml/code
179        that enable the use of seaice (pkg/thsice thermo & pkg/seaice dynamics)
180        with pkg/cheapaml.
181    o utils/python: add subpackage for cubed sphere function, first example is
182        simple cs.pcol to plot 2D fields on a map
183    o pkg/streamice:
184      - This is a new package in MITgcm, which solves dynamic equations for ice
185         sheets and ice streams
186      - At the moment it is independent of atmosphere/ocean dynamics, or any
187        other physical packages in MITgcm, even ShelfIce (although it is anticipat-
188        ed that this will change)
189      - There is a new verification exercise that tests it, halfpipe_streamice,
190        evolves a 40x80 km ice stream/ice shelf (at coarse resolution) in a
191        rectangular embayment
192      - halfpipe_streamice is forward-only for now, will have TAF test soon
193      - for questions, email dgoldber@mit.edu
194    o pkg/thsice:
195      - fix filling of snow-precip diagnostic (SIsnwPrc) (left from the removing
196        of snowPrc from common bloc, on May 2nd, thsice_step_fwd.F revision 1.40);
197      - remove diagnostics 'SI_FrcFx' ( now identical to 'SI_Fract' with new
198         call sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect );
199      - allow precip from pkg/cheapaml to make snow over seaice.
200    o pkg/cfc:
201      - move in separated header file (CFC_ATMOS.h) time-serie arrays of Atmos CFC
202      - remove atmos CFC 2-D arrays from common bloc (now local variables)
203      - change some hard-coded constant to run time parameter for reading and
204        and interpolating atmospheric CFC ; keep same default as previously.
205      - more flexible reading of Atmos CFC (number of records no longer hard-coded)
206      - put arguments in standard order: myTime, myIter, myThid
207      - use standard S/R GET_PERIODIC_INTERVAL for time interpolation of
208        atmospheric CFC ; fix for the case myIter < PTRACERS_iter0.
209      - fix calculation of surf tendencys for partial-cell and/or Non-Lin Free-Surf
210      - new routine to print summary of CFC params and check for consistency.
211    o pkg/seaice: add uice/vice to the parameter list of s/r seaice_advdiff,
212      similar to thsice_advdiff.
213      Note that for the B-grid case the routine parameters uc/vc are overwritten.
214    o pkg/cfc:
215      - change time interpolation for atmospheric CFC-11 (now same as for CFC-12);
216        update output (CFC-11) of experiment cfc_example and tutorial_cfc_offline.
217      - fix interpolation of atmphspheric CFC between Sorthern and Northern
218        hemisphere value.
219    o pkg/seaice:
220      - allow to use seaice dynamics without pkg/exf (e.g., using pkg/cheapaml)
221    o pkg/seaice: add Adams-Bashforth2 time discretization for ice dynamics;
222                  so far only for JFNK-solver, turn on with SEAICEuseAB2 = .TRUE.
223      - requires an additional time level that is stored in the pickup
224      - you can start with AB2 from a pickup without this time level with
225        pickupStrictlyMatch = .false.
226    
227    checkpoint64h (2013/05/26)
228    o pkg/cheapaml:
229      - replace one ()**.5 with SQRT + use temp var "cdu = tau/Du" (coare3_flux);
230        affect machine truncation (but exp cheapAML_box still pass with 13 digits).
231      - consistent treatment of uWind,vWind location: assume everywhere in
232        pkg/cheapaml that they are on C-grid (@ uVel,vVel location)
233        (Note: was already the case for Tair,Qair advection);
234        add option (INCONSISTENT_WIND_LOCATION) to recover old results.
235      - compute diabatic forcing only in the interior (excluding overlap regions)
236      - fill in array "Qsw" (for short-wave heating);
237      - add diagnostic for precip ; fill-in diagnostics for cheapAML state vars
238        before any update (consistent with MITgcm state var diagnostics);
239      - cheapaml_fields_load.F & cheapaml_init_varia.F : only fill outer edges if
240        non periodic ; + adjusted for uWind,vWind (C-grid).
241    o pkg/seaice:
242      - remove dependence of pkg/seaice versus pkg/exf (file: pkg/pkg_depend) and
243        add explicitly pkg/exf in experiments that currently use pkg/seaice.
244      - allows to compile pkg/seaice without pkg/exf.
245    o tools/OAD_support:
246      - use a local copy (ourRWCPinBd) to ensure index ourRWCP stays within bounds
247        of array "ourStepOf" in function rvNextAction (revolve.F90).
248    o pkg/aim_compon_interf renamed to pkg/atm_compon_interf
249      - change pkg name (to be used with other atmospheric physics pkg)
250        but by-pass CVS when making the new pkg so that we keep the CVS history.
251    o pkg/offline:
252      - call OFFLINE_FIELDS_LOAD from pkg/offline/offline_init_varia.F
253        (previously called from pkg/dic_surfforcing_init.F)
254    o model/src:
255      - re-order sequence of calls within packages_init_variables.F, using
256        standard order, except for:
257         DIAGNOSTICS_INIT_VARIA and OFFLINE_INIT_VARIA (called @ the top),
258         CTRL_MAP_INI and OBCS_INIT_VARIABLES (called @ the bottom)
259    o new pkg: atm_phys
260      - add entry point and source code (previously in contrib
261          verification_other/atm_gray/code_gray/) for new pkg "atm_phys"
262        (atmospheric physics pkg from P. O'Gorman and T. Schneider, JCl, 2008).
263      - re-order sequence of calls within packages_readparms.F,
264         packages_init_fixed.F and packages_write_pickup.F
265        (but skip packages_init_variables.F because of TAF issues).
266      - update contrib/*/atm_gray/ experiment.
267    o pkg/seaice (ITD code):
268      - simplify and fix the writing of pickup-files for ITD case
269    o pkg/seaice (ITD code):
270      - introduce floe size dependent lateral melt for ITD case;
271      - cleaning (avoid division by zero, change to f77 syntax, remove tabs)
272      - update seaice_itd experiment main output.
273    o pkg/thsice:
274      - remove snowPrc from common block THSICE_FLUX, in THSICE_VARS.h and
275        declared it locally (without bi,bj) in thsice_main.F & aim_do_physics.F;
276        changed accordingly pkg/atm2d.
277    
278    checkpoint64g (2013/05/01)
279    o pkg/exf ALLOW_RUNOFTEMP
280      - if defined,  river and glacier runoff temperature can be read-in from
281        runoftempfile; runoftempfile needs to have same format as runofffile
282    o pkg/thsice (& pkg/bulk_force):
283      - In case Energy-Reference-Level (ERL) is used (temp_EvPrRn=0), account
284        for energy content of Precip + RunOff & Evap (like with pkg/exf).
285      - change computation domain to always be the interior (without overlap).
286      - fix bug (wrong overlap) when using EXF and stressReduction > 0.
287    o verification/tutorial_global_oce_biogeo:
288      - add preliminary OpenAD setup (still has problems)
289    o pkg/seaice:
290      - turn some parameters for choosing the convergence criterion of
291        the inexact Newton method (JFNK) into runtime parameters for convenience
292      - clean up seaice_calc_viscosities.F: remove/retire two options for
293        SEAICetaZmethod (1,2), introduce area weighting for method 3; this changes
294        the results of lab_sea/input because a division has been replaced by
295        a multiplication with the reciprocal (sumNorm)
296      - modify offline_exf_seaice/input.dyn_jfnk/data.seaice to improve
297        convergence of solver (changes results, of course), and to test some
298        new features
299    o model/src:
300      - remove unused (since Aug 2006) S/R SET_WRITE_GLOBAL_PICKUP and its call.
301      - remove unused forcing field "dQdT" and associated parameter "dQdTFile".
302      - move forcing adjustment (balancing surface forcing) in specific S/R
303        where might also be applied exchanges (if needed) to forcing arrays.
304    o pkg/shelfice:
305      - allow to specify the Ice-Shelf mass per unit area (instead of
306        shelficeLoadAnomaly) and do the conversion from one to the other
307      - move loading from file of shelficeLoadAnomaly from SHELFICE_INIT_VARIA
308        to SHELFICE_INIT_FIXED: (a) avoid some TAF recompution issues and
309        (b) will be loaded in time (before calling INI_PRESSURE) in case it is
310        needed in phi0surf for initial pressure calculation when useDynP_inEos_Zc
311      - update isomip experiment forward output (get machine truncation error
312        from conversion shelficeLoadAnomaly -> shelficeMass -> shelficeLoadAnomaly)
313    o verification/offline_exf_seaice:
314      revise data.seaice in input.thermo and input_ad and update results accordingly
315        HO = 0.2, SEAICE_areaLossFormula = 2,
316        SEAICE_growMeltByConv = .TRUE.,
317        SEAICE_doOpenWaterMelt = .TRUE.,
318      Improve consistency with input.thsice and fix the spurious 500m ice corners
319    o verification/global_ocean.cs32x15:
320      - set Energy Reference Level to liq. water @ 0 degC: temp_EvPrRn=0.,
321        in icedyn (thsice+seaice-dyn) test and update output.
322    o verification/offline_exf_seaice:
323      - adjust list of tested variables (with testreport) and update
324        standard test output with better slection of monitored fields.
325    o pkg/cd_code:
326      - swtich off Adams-Bashforth on the 1rst iteration. Update output of
327        experiment lab_sea.hb87
328    o tools/genmake2:
329      - change default makedepend from the system default to tools/xmakedepend:
330        When no makedepend is specified, select tools/xmakedepend it the test pass,
331        otherwise select the system default (if exist and pass the test) or
332        try to build cyrus-makedepend ; stop if none of the 3 works.
333    o pkg/exf & pkg/thsice:
334      - In case Energy-Reference-Level (ERL) is used (temp_EvPrRn=0), account
335        for energy content of Precip + RunOff & Evap. Assumes:
336       1) Rain has same temp as Air.
337       2) Snow has no heat capacity (consistent with seaice & thsice pkgs)
338       3) Run-Off comes at the temp of surface water (with same Cp)
339       4) Evap over ocean is released to the Atmos @ surf-temp (=SST); should be
340        put directly into Latent Heat flux & should use water-vapor heat capacity.
341       5) Evap over snow/seaice (pkg/thsice) assumes constant Lf+Lv (consistent
342        with snow having no Cp) => water vapor is released to Atmos @ 0^oC (=ERL).
343    o pkg/seaice: simplify the use of CPP flags in JFNK-related files
344        (compile when SEAICE_ALLOW_JFNK is defined)
345    o pkg/thsice:
346      - fix oceanic flux diagnostics & timeave (left from new sequence of calls
347        implementation): move THSICE_AVE call after the advection (called directly
348        from thsice_do_advect.F).
349    o verification/global_ocean.90x40x15 and OpenAD:
350      New experiment for OpenAD is identical to the one in input_ad except that
351        multiDimAdvection=.FALSE.,
352      There is still an issue with this.
353    o pkg/thsice:
354      - account for ice velocity (ocean relative velocity) in turbulent heat flux
355        at the base of the ice; update output of global_ocean.cs32x15 (icedyn)
356        and offline_exf_seaice (main test).
357    
358    checkpoint64f (2013/03/31)
359    o verification/OpenAD:
360      - new (smaller, without OAD_DEBUG) output_oadm.txt generated using gfortran.
361    o verification/isomip, pkg/shelfice and OpenAD:
362      - add OpenAD setup to this exp and make shelfice package work with OpenAD
363    o verification/tutorial_global_oce_biogeo:
364      - update AD and TLM output after turning off ALLOW_FE (in DIC_OPTIONS.h)
365    o verification/offline_exf_seaice:
366      - replace adjoint experiment (now similar to fwd input.thermo/ setup).
367    o verification/tutorial_tracer_adjsens, pkg/ptracers and OpenAD:
368      - add OpenAD setup to this exp and make ptracers package work with OpenAD
369    o pkg/seaice/seaice_evp.F:
370       mask the asymmetric contribution of the ice-ocean stress (when
371       the turningAngle is non-zero) over open water to avoid stripes
372       in the EVP-solutions after many EVP-substeps. This does not change
373       the verification experiment (because turningAngle=0 in that experiment),
374       but will affect other EVP solutions with turningAngle.ne.0
375    o verification, AD & TLM output:
376      - new TAF version 2.3.10 (previously 2.3.8) add more parenthesis in multiple
377        additions and multiplications which affect results at machine truncation
378        level. Update few AD output (1D_ocean_ice_column, bottom_ctrl_5x5,
379        lab_sea.noseaicedyn & offline_exf_seaice) and TLM output
380        (1D_ocean_ice_column & tutorial_tracer_adjsens.som81) which had only 12
381        digits of matching.
382    o pkg/seaice:
383       modify lsr-algorithm so that it vectorizes AND converges by using a
384       "zebra" method: split vector loop into two with step size 2; this
385       solves a general convergence problem for the JFNK solver on a vector
386       computer. It has the potential to even improve convergence for
387       non-vector machines, but it does change the results so it is turned
388       off by default. To turn on define CPP-flags SEAICE_VECTORIZE_LSR and
389       SEAICE_VECTORIZE_LSR_ZEBRA in SEAICE_OPTIONS.h
390    
391    checkpoint64e (2013/03/05)
392    o pkg/ecco and several verification experiments:
393       Remove special versions of the_model_main.F, the_main_loop.F, forward_step.F
394       from ecco package, and revert to unified routine in model/src/
395       Adjust verification experiments accordingly, especially gloal_oce_llc90
396       Should conclude long-standing work by Gael to reconsile the_main_loop with
397       ECCO and will enable OpenAD's revolve loop in ECCO setup.
398    o pkg/generic_advdiff:
399      - implement compressible flow method for multi-dim advection (similar to
400        gad_som_advect.F); add new option "GAD_MULTIDIM_COMPRESSIBLE" (since
401        TAF generates many recomputations) to use it; no yet coded with implicit
402        vertical advection.
403      - change experiment advect_cs (new output) and advect_xy (same output)
404        to test compressible flow multi-dim advection.
405    o pkg/generic_advdiff:
406      - fix SOM advection for unusual cases (linear Free-Surf in r*, other
407        cases where linear Free-Surf is not @ k=1, e.g., useShelfIce)
408    o pkg/seaice:
409      - fix bug in the no-slip implementation in seaice_calc_strainrates.F, this
410        bug affects two verification experiments (lab_sea and lab_sea.hb87),
411        recover old (wrong) results by setting noSlipFac = 2. in
412        seaice_calc_strainrates.F;
413      - add another averaging method for etaZ (etaZmethod=3), a mix of 2 and 0
414      - add runtime parameter SEAICE_JFNKepsilon for that finite difference
415        gradient in the Jacobian times vector operation (s/r seaice_jacvec)
416      - fix line search in seaice_jfnk.F (s/r seaice_jfnk_update)
417    o pkg/seaice: reorganize seaice_lsr.F to be able to reuse more code:
418      - new subroutines seaice_lsr_tridiagu/v
419      - introduce loop bounds i/jmin/max to be able to use a restricted
420        additive Schwarz method, but not used for now.
421      - rename SEAICE_CALC_LSR_COEFFS into SEAICE_LSR_CALC_COEFFS
422      - use new subroutines seaice_lsr_tridiagu/v in s/r seaice_preconditioner
423    o OpenAD support
424       Reorganize S/R call for overall time-stepping loop to facilitate
425       OpenAD revolve loop replacement
426       (new S/R main_do_loop.F)
427    o model/src:
428      - add 3-D array 3rd dimension to argument list of S/R ADAMS_BASHFORTH2/3;
429      - pkg/cheapaml: remove local S/R ADAMS2d and use instead standard S/R
430        ADAMS_BASHFORTH2.
431    o pkg/cheapaml:
432      - add new parameter (default=F, same as before) to disable full domain
433        (including land) periodicity in X & Y dir.
434      - new S/R CHEAPAML_COPY_EDGES to copy relaxation field into edges of
435        prognostics field ; merge the 2 S/R cycle_2d_tracer and timestep_2d_tracer
436        into single S/R CHEAPAML_TIMESTEP.
437    
438    checkpoint64d (2013/02/17)
439    o pkg/monitor (angular momentum):
440      - do not add Eta contribution to the total AM if using rigid-lid;
441      - correct for Adams-Bashforth in zonal-wind part (instead of in AM_eta).
442      - horizontal discretisation: compute Zonal wind contribution separately for
443        each component (instead of from cell centered averaged) and use the 4
444        grid-cell corner averaged value of Omega*(R*cos_Phi)^2 in AM_eta part.
445      - Check that AM is conserved with linear dynamics (momAdvection=F and linear
446        FreeSurf) if using vectorInvariant momentum.
447    o model/src (horizontal grid):
448      - move initialisation of all horizontal grid arrays to null value
449        from specific horizontal grid S/R to main S/R INI_GRID;
450      - add 2 new arrays to project model C-grid velocity on to zonal direction
451        (similar to AngleCosC & -AngleSinC but at U and V point location) and
452        compute them in S/R CALC_GRID_ANGLES.
453    o pkg/seaice: replace a hard coded parameter by a runtime parameter
454        SEAICE_JFNK_tolIter
455    o pkg/seaice: introduce a restricted additive Schwarz (RAS) method in
456        preconditioner for JFNK (run LSR into the overlaps as far as possible,
457        i.e OLx/y-2, but overwrite the solution in the overlaps)
458      - extend loop range in seaice_calc_viscosity
459      - add new parameters SEAICE_OLx/y (default = OLx/y-2)
460      - add flexible loop ranges to seaice_preconditioner, seaice_calc_lsr_coeffs
461      - slightly modify loops in tridiagonal solver lsr-preconditioner
462      - by default remove the extra exchange in seaice_preconditioner with a
463        replacement of an undocumented CPP flag by SEAICE_PRECOND_EXTRA_EXCHANGE
464      - modify offline_exf_seaice so that old results without RAS are reproduced
465        for output.dyn_jfnk.txt
466      in seaice_fgmres.F (unrelated to RAS)
467      - add a cpp-flag option for a re-ordered mapping (potentially more
468        efficient), but because this changes the results, turn it off by
469        default
470      - replace the save statement by local common blocks
471    o utils/matlab:
472      - fix tile-offset in rdmnc.m when output was produced using EXCH2.
473      - update cs_grid/bk_line scripts to use load_grid.m (in utils/matlab)
474        instead of local script "load_cs.m".
475    o pkg/seaice:
476      - fix a serious bug in seaice_fgmres.F, s/r seaice_scalprod, connected
477        to the scalarProductMetric and the unrolling. By chance this does not
478        change the verification experiment, because of the particular domain
479        decomposition
480    o pkg/diagnostics:
481      - change default missing_value from UNSET_RL to -999.
482    o pkg/layers: improve vectorization of layers_fluxcalc.F
483      - step 1: split loops, make TatU/V 2D arrays. This alone reduces the cpu
484        time spent in this routine by more than a factor of 3 on an NEC-SX8
485      - step 2: replace search algorithm by a bisection algorithm found in
486        Press et al. Numerical Recipes in Fortran. This algorithm can be
487        vectorized and finds the correct bin in approx. log2(Nlayers) steps.
488        For now, use this algorithm only for TARGET_NEC_SX defined.
489      - moved the search algorithm into a separate subroutine, that is kept
490        within the same file for automatic inlining.
491      - modified catching potential errors
492    o pkg/ecco:
493      - add compile switches ALLOW_SHALLOW_ALTIMETRY and ALLOW_HIGHLAT_ALTIMETRY.
494    o model/src, pkg/autodiff, pkg/ctrl, pkg/grdchk :
495      - modifications for ALLOW_GENTIM2D_CONTROL
496      -- forward_step.F, the_main_loop.F : pass options and arrays for adjoint tapes.
497      -- load_fields_driver.F : add call to CTRL_MAP_GENTIM2D( myTime, myIter, myThid )
498      -- add xx_gentim2d0/1 in ctrl_ad_check_lev1_dir.h checkpoint_lev1_directives.h etc
499      -- use ctrl_swapffields.F (new) instead of exf_SwapFFields.F in ctrl_get_gen.F
500    o model/src:
501      - account for moist thermodynamics in (dry) potential temperature equation;
502        update results of experiments: aim.5l_cs (x2), fizhi-cs (std + aqualev)
503        and cpl_aim+ocn.
504      - also switch to standard compiler (gfortran, was using ifort previously)
505        for fizhi-cs experiments reference output.
506    o pkg/ctrl:
507      - 1st step toward generic time-varying control variable (2D) via CPP option
508        ALLOW_GENTIM2D_CONTROL
509      - note new namelist ctrl_nml_genarr in data.ctrl
510    o verification/global_ocean.cs32x15:
511      - switch off OLD_THSICE_CALL_SEQUENCE (both forward and AD code) to use new
512        thsice calling sequence and update "output.icedyn.txt" output file.
513    o pkg/ptracers:
514      - from Ryan A.: code to allow to restart a tracer at regular time interval
515        specifying a reset frequency and a reset-phase (for each tracers).
516    o pkg/thsice:
517      - implement new sequence of calls for thsice+seaice:
518          previously:   ice-Dyn,ice-Advect,ice-Thermo(thsice)
519          new sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect
520      - allows (with temporary CPP option "#define OLD_THSICE_CALL_SEQUENCE"
521        in CPP_OPTIONS.h) to recover old sequence;
522      - update diagnostics for Intermediate State thsice diagnostics: now filled
523        just before advection (instead of just after advection in old sequence);
524      - update output of experiment offline_exf_seaice (standard test);
525      - in global_ocean.cs32x15 exp., postpone output.icedyn.txt update
526        by setting #define OLD_THSICE_CALL_SEQUENCE in CPP_OPTIONS.h
527    o pkg/aim_v23:
528      - use tiled array for aim_CO2 and surface wind speed for export to coupler;
529      - use standard pkg/mdsio routines to read & write CO2 pickup file;
530      - in-line S/R AIM_AIM2DYN_EXCHANGES in aim_do_physics.F;
531      - Implement new sequence of calls for seaice advection (with thsice and
532        seaice diffusion): do ice advection after ice-Thermodynamic (previously
533        was done before); change aim_do_physics.F (split the bi,bj loops block);
534      - use same CPP option (OLD_THSICE_CALL_SEQUENCE) to recover old sequence;
535    o pkg/thsice:
536      - add a missing EXCH of sIceLoad in thsice_main.F (ocean set-up) for the case
537        where just seaice diffusion is used without seaice-dynamics.
538    
539    checkpoint64c (2013/01/18)
540    o pkg/seaice:
541      - add a parameter JFNKres_tFac that can replace JFNKres_t
542        (= JFNKres_tFac*JFNKresidual before JFNK solver)
543      - add a line search option to the JFNK solver
544      - move update of u/vIce and computation of initial residual into a separate
545        routine (same file); makes the code a little easier to read (?)
546      - the line search requires computation of the residual and for some reason
547        I cannot do the update of u/vIce at the beginning of the Newton loop
548        without changing the results, so we move computation of the new residual
549        also to the end of the Newton loop, even without the line search
550    o pkg/mdsio:
551      - write missing value (corresponding to undefined array value) to meta files;
552        skip this if missing value is one (UNSET_RL would be a better value for the
553        case of undefined missing value but it's current the default missing-value);
554        Also update mdsio_read_meta.F (reading timeInterval & missing-value).
555    o pkg/exf & thsice:
556      - for diagnostics purpose, fill-up and update Qsw array (+ fill the
557        diagnostics) even when SHORTWAVE_HEATING is #undef;
558    o verification/cfc_example:
559      - turn on pkg/layers with pkg/diagnostics (to test pkg/layers and to
560        illustrate how to use it).
561    o verification/offline_exf_seaice:
562      in input: add SEAICErestoreUnderIce=.TRUE., and reduce size of forcing
563        files to only one time-record.
564      in input.thermo: narrow the 2 bands of low initial ice-concentration near
565        N & S edges; switch on SEAICErestoreUnderIce=T; use pkg/diagnostics for
566        snapshot output; same mcPheePiston value as in thsice with
567        surf-current=0.2m/s.
568      in input.thsice: similar set-up as in input.thermo (channel with same seaice
569        initial conditions).
570    o verification/cfc_example:
571      - update file "data" with more standard choice (default rotationPeriod,
572        exactConserv=T, reduce ivdc_kappa to 10, remove multiDimAdvection=F,
573        set deltaTFreeSurf to deltaTtracer) and update the output.
574    o pkg/layers:
575      - fix bolus part so that it compiles with #undef GM_BOLUS_ADVEC;
576      - ensure that "layers_bolus" is switched to False when useGMRedi=False.
577    o verification/offline_exf_seaice:
578      - set all {field}period to zero for constant-in-time forcing (not tested
579        anywhere else).
580    o verification/offline_exf_seaice:
581      - dyn_lsr  : use pkg/seaice S/R (instead of pkg/thsice) to advect sea-ice;
582      - dyn_jfnk : use pkg/thsice S/R (instead of pkg/seaice) to advect sea-ice.
583    o model/src:
584      - implement Finite-Volume method for (hydrostatic) presure gradient
585        from S.-J. Lin (QJRMS 1997), for atmosphere using sigma-coordinate.
586    o pkg/seaice: implement EVP* by Lemieux et al. (2012).
587      - In order to be compatible with the default EVP code, this requires changing
588        the EVP code around a little; and because any small change immediately
589        breaks the lab_sea.hb87 verification experiment, the reference output is
590        updated two times (each time the remaining aggrement was only 2 digits):
591        - after replacing 1/dt by 1*recip_dt with a precomputed recip_dt
592        - after replacing 1/(1+0.5*dt/tau) by a/(a+1), with a=2*tau/dt
593        The adjoint test lab_sea.evp also needed to be updated.
594      - Turn on EVP* by setting SEAICE_deltaTevp as before, and setting
595        SEAICEuseEVPstar=.true.; for EVP* SEAICE_deltaTevp does not need to be
596        a factor of SEAICE_deltaTdyn, and you can set the number of EVP steps
597        explicitly with SEAICEnEVPstarSteps (thereby overriding the default of
598        INT(SEAICE_deltaTdyn/SEAICE_deltaTevp)). Controlling EVP* is deliberately
599        kept obscure, because I need to test it a little more.
600    o pkg/cheapaml:
601      - fix few incorrect type (_RL/_RS) in subroutine calls.
602    o pkg/seaice:
603      - new S/R SEAICE_MAP_RS2VEC (similar to SEAICE_MAP2VEC) to map _RS arrays
604        to _RL vector; this fixes JFNK code when compiling with "-use_r4" option.
605    o model/src:
606      - add a warning if using select_rStar=2 with nonlinFreeSurf <> 4;
607        change (in input_ad*/data) select_rStar from 2 to 1 for AD verification
608        experiments global_ocean.cs32x15 & tutorial_tracer_adjsens (+ update output)
609    o pkg/cheapaml:
610      - replace "273.1 _d 0" by celsius2K in pkg/cheapaml/cheapaml.F and
611        update output of experiment cheapAML_box.
612      - store in CHEAPAML.h coeffs ssq[0:2] for saturation specific humidity,
613        and set them only in one place (cheapaml_readparms.F).
614      - replace "273.16 _d 0" by celsius2K & replace "3.14159 _d 0" by constant "PI"
615      - remove re-setting of main-model parameter "celsius2K" (in cheapaml_readparms)
616        and re-setting of cheapAML params "lath" & "p0" (in cheapaml_init_varia).
617    o model/src/the_main_loop.F:
618      - fix revision 129 : need both ALLOW_ECCO and ALLOW_ECCO_EVOLUTION.
619    o pkg/seaice:
620      - remove legacy branch code.
621      - retire SEAICE_GROWTH_LEGACY and SEAICE_CAP_HEFF accordingly.
622    o verification/*/code*/SEAICE_OPTIONS.h:
623      - remove documentation for retired CPP flags (SEAICE_GROWTH_LEGACY,
624        SEAICE_CAP_HEFF).
625    o pkg/cheapaml:
626      - use standard routine (S/R GET_PERIODIC_INTERVAL) to decide when it is time
627        to load new forcing fields.
628      - add missing "_d 0" where it's needed; + some editing (improve indentation).
629      - remove switch to "-r8" compiler option (no longer needed) in verification
630        cheapAML_box, keep same output (small trucation error differences).
631    o verification/offline_exf_seaice:
632      - add thermodynamics only test.
633    o verification/cheapAML_box:
634      - split the domain in 8 (2x4) tiles; add MPI and multi-threaded test;
635        keep same output (same 14 digits for cg2d).
636      - switch on "-r8" compiler option (some numerical values are missing
637        the "_d 0") and update output (only 6 digits for cg2d were preserved).
638    
639    checkpoint64b (2012/12/24)
640    o pkg/cheapaml:
641      - remove un-used variables (Qnet,EmPmR) from pickup files.
642      - store tendency of advected variables into cheapaml pickup file
643        and fix the AB-2 restart.
644    o verification/offline_exf_seaice and lab_sea adjoint:
645      - switch to new code (#undef SEAICE_GROWTH_LEGACY).
646      - switch to 4 time steps in offline, consistent with lab_sea.
647      - match parameters from SEAICE_GROWTH_LEGACY branch in data.seaice.
648      - update results after change of experiment seaice.
649    o pkg/seaice:
650      - remove option SEAICE_MULTICATEGORY; has been replaced with run-time
651        parameter SEAICE_multDim. Issue a warning if SEAICE_MULTICATEGORY is
652        still defined since SEAICE_multDim needs to be set to MULTDIM value (from
653        SEAICE_SIZE.h) to recover previous #define SEAICE_MULTICATEGORY default.
654    o model/src:
655      - add run-time parameter to select CG2D solver minimum-residual solution
656        (in case of a poor convergence).
657    o pkg/seaice/seaice_lsr.F
658      - move calculation of matrix coefficients into new
659        S/R SEAICE_CALC_LSR_COEFFS; for now this routine remains in the same
660        file; the main purpose of this change is to be able to reuse the code
661        in S/R SEAICE_PRECONDITIONER
662      - modify the computation of the residual so that the mass of sea-ice
663        is not used twice; this simplifies the calculations, but since
664        the residual is never used except when LSR_mixIniGuess.ge.4---and this is
665        not tested in testreport---this does not affect the testreport results.
666    o verification/seaice_obcs:
667      - disable SEAICE_GROWTH_LEGACY; reset input files to match those of
668        verification/lab_sea/input.salt_plume; changes results/output.txt*
669    o model/src:
670      - adapt quasi-hydrostatic formulation to work with p or p* coordinate.
671    o pkg/seaice:
672      - improve description of parameters in seaice_fgmres.F and start
673        cleaning up the code
674      - change name of SCALPROD to SEAICE_SCALPROD and modify meaning of
675        second argument
676      - add a metric based on grid cell area to SEAICE_SCALPROD; update
677        results of offline_exf_seaice.dyn_jfnk
678      - compute initial residual norm in seaice_jfnk based on SEAICE_SCALPROD
679    o pkg/aim_v23:
680      - fix an other bug in dissipation heating (grid-cell area was missing).
681    o model/src + pkg/seaice:
682      - add global (multi-tile) linear solver for pair of tri-diagonal system
683        along X and Y lines, respectively for U and V component.
684        Note: 1) MPI and cube-exchange not yet coded.
685            2) probably not accurate for poorly conditioned / large size problem.
686      - add option for SEAICE_LSR to use global (multi-tile) tri-diagonal solver;
687        default: not compiled and not used.
688    o pkg/seaice:
689      - first attempt at a multi-threaded fgmres solver for the JFNK solver:
690        introduce bi/bj loops and use global_sum_tile_rl instead of
691        mpi_allreduce in seaice_fgmres.F
692      - improve diagnostics output for fgmres solver (seaice_fgmres.F)
693      - replace a few unnecessary goto statements by if-blocks  (seaice_fgmres.F)
694      - add a verification experiment for JFNK in offline_exf_seaice
695    o verification:
696      - change (for now, only fwd test) offline_exf_seaice experiment:
697        use a re-entrant channel with idealized coastline (trapezoidal shape)
698        at southern boundary to explore seaice dynamics and thermodynamics
699        with simple forcing. Main set-up has dynamics+thermo and SST relaxation;
700        secondary test (input.thsice) use thermodynamics only with SST relaxation.
701      - add seaice-dynamics only secondary test using LSR and pkg/thsice advection.
702    o pkg/exf:
703      - disable "sstExtrapol" when Nr=1
704    o verification:
705      - add new experiment "cheapAML_box" (simple 1 layer set-up from Bruno Deremble)
706        to test pkg/cheapaml.
707    o pkg/aim_v23 & pkg/shap_filt:
708      - fix dissipation heating (erroneous gravity multiplication factor).
709    o pkg/seaice:
710      - remove unused field pressPre from jfnk solver
711      - rename two subroutines in seaice_preconditioner.F
712    o eesupp/src:
713       - S/R MDSFINDUNIT avoids reserved unit numbers (scrUnit1, eeDataUnit ...)
714    o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again
715       - remove wrong parts of the rhs and the lhs (were in there
716         because I did not understand the concept of this preconditioner)
717       - add an exchange between u- and v-sweep. This increases communication
718         by a factor of two but improves the convergence of jfnk. Ideally,
719         one would like the u- and v-sweep to be independent. So far within
720         undocumented ifdefs
721       - reorganize the extra computations for printing the residuals
722    o tools/genmake2:
723      - comment out the "mpif.h" include in NetCDF test programm (for MPI built)
724        since it's not necessary (and was preventing to use MNC in some cases).
725    
726    checkpoint64a (2012/11/16)
727    o pkg/autodiff:
728      - improve pkg-internal logical parameter switch (inAd/inFwd mode) so that
729        autodiff_readparms.F no longer depends on calling order (within
730        packages_readparms.F) and no longer requires to include ${PKG}_PARMS.h):
731        rename param turnFreeDriftInAdMode to SEAICEuseFREEDRIFTswitchInAd
732        and change param SEAICEuseDYNAMICSinAdMode to SEAICEuseDYNAMICSswitchInAd.
733    o pkg/obcs:
734      - adding tidal velocity forcing capability to obcs
735        for usage example, see verification/seaice_obcs/input.tides
736    o pkg/seaice:
737      - turn the LSR-relaxation parameters WFAU/V into runtime parameters
738        SEAICE_LSRrelaxU/V
739      - introduce runtime parameter SEAICEetaZmethod (=0 by default)
740    o pkg/aim_v23:
741      - implement heating from friction (bottom friction and stratospheric drag).
742    o pkg/shap_filt:
743      - fix diagnostic "SHAP_dKE" (was 2 time smaller); implement heating from
744        dissipation but only for Shap_funct=2, active when addFrictionHeating=T.
745    o model/src:
746      - move AddMass common block from DYNVARS.h to FFIELDS.h; allow to read-in
747        time-constant addMass field from file (addMassFile);
748      - support for heating due to friction (and Kinetic Energy dissipation):
749        add option, run-time switch and 3-D field array + support code ; each pkg
750        or S/R can add heating contribution (if there is a sink of KE); the sum is
751        accounted for as a Temperature tendency term (EXTERNAL_FORCING_T).
752    o pkg/seaice:
753      - complete merge of ITD code into seaice_growth.F
754        from MITgcm_contrib/torge/itd/code/
755        no verification so far, but Torge Martin tested
756        "1-D test case and Beaufort set up;
757        deliver okay results after 1 model year."
758      - complete merge of SEAICE_SIZE.h into all relevant routines
759      - move computation of eta at Z-points into calc_viscosities
760        + introduce global field etaZ
761        + add different methods for computing etaZ, for now the old
762          method (simple averages of eta to Z-points) is hardwired
763        + replace etaMeanZ by etaZ in seaice_lsr, seaice_calc_residual,
764          seaice_preconditioner
765      - simplify computations for SEAICE_ZETA_SMOOTHREG
766      - seaice_preconditioner:
767        + replace one remaining press by pressLoc (mistake)
768        + adjust printing of residuals
769      - improve I/O of diagnostics of JFNK in seaice_jfnk.F:
770        + add (SEAICE.h) and rename some counters (initiliased in
771          seaice_init_fixed.F)
772        + add _BEGIN/END_MASTER (myThid)  around print statements
773        + print total number of iterations and failures over SEAICE_monFreq
774          interval to STDOUT
775      - move control over output-messages by fgmres to seaice_jfnk to save
776        some operations
777      - move resetting initial guess for fgmres outside of seaice_fgmres_driver
778        in order to make restarts with sol .ne. zero (fgmres with restarts)
779        (seaice_jfnk.F, seaice_fgmres.F)
780      - seaice_calc_l/rhs.F: replace maskW/S by maskInW/S; this fixes
781        a serious convergence problem when open boundaries are involved
782    o pkg/ggl90: fix computation of control volumes for the case of
783      ALLOW_GGL90_HORIZDIFF (probably not used very often): move control volumes
784      up half a grid cell from C-centered to W-centered (pointed out by C. Eden)
785    o pkg/seaice: simplify seaice_evp by avoiding use of extra fields u/vIceC
786    o pkg/autodiff
787      - Add inAdMode switch for SEAICEuseDYNAMICS:
788        SEAICEuseDYNAMICSinAdMode
789        (extend logic in ADAUTODIFF_INADMODE_SET)
790    o pkg/seaice
791      - Step 1 of merging ice-thickness distribution (ITD) code from
792        MITgcm_contrib/torge/itd/ (author: Torge Martin)
793        The code implements concept laid out in Thorndike et al. (1975);
794        code is enabled via CPP flag SEAICE_ITD
795        nITD (in SEAICE_SIZE.h) defines number of ice thickness categories;
796        code is not complete yet!!
797      - SEAICE_SIZE.h now included in almost all seaice routines
798    o verification (using seaice):
799      - switch back seaice-dynamics (+ lower SOLV_MAX_ITERS) in ADM exp.
800        global_ocean.cs32x15.seaice ; update results.
801      - compile B-grid dynamics in FW test exp 1D_ocean_ice_column ;
802      - compile C-grid dynamics with #define SEAICE_ALLOW_JFNK in FW test exp
803        offline_exf_seaice (previously compiling B-grid).
804    o pkg/exf:
805      - fix some STOP conditions in exf_check.F (from Aug 28, modifs did not allow
806        to specify neither just 1 comp of wind or wind-stress, nor no surface momentum
807        forcing): just replace CPP option ALLOW_ATM_WIND with run-time param useAtmWind.
808    o pkg/layers (adjust changes from Sept 19):
809      - do snap-shot output and fill diagnostics from inside iLa loop (layers_calc.F)
810        this allows to remove "layers_maxNum" dimension from all layers arrays.
811    o pkg/layers (adjust changes from Sept 19):
812      - remove ALLOW_LAYERS_OUTPUT ; fix snap-shot and time-ave output ;
813      - snap-shot extended to all type of layers (not just the 1rst type);
814      - remove layers variables when corresponding CPP option is undef.
815    o pkg/layers:
816      - rename pkg/layers variable and add new output (layer exist & un-weighted
817        velocity in layer)
818    o pkg/seaice:
819      - simplify (?) ocean-drag coefficent computations by using
820        the same routine in all three solvers (saves some code lines)
821      - remove global fields DRAGA and DRAGS from C-grid code and
822        declare them locally in lsr.F (the only place where they are
823        still used)
824      - update AD output of lab_sea.evp (very sensitive anyway).
825    o pkg/seaice: add Jacobian-free Newton Krylov solver for ice dynamics
826      (Lemieux et al. 2010, 2012). Turn on with the usual SEAICE_ALLOW_JFNK
827      and SEAICEuseJFNK=.true. A few things to note:
828      - involves a FGMRES, that is parallel but very inefficient,
829        because of many scalar products (global sums) in the Gram-Schmidt
830        orthogonalization method. Needs to be replaced. Original code
831        from J.-F. Lemieux
832      - preconditioner for FGMRES is a stripped down version of LSOR
833      - SOLV_MAX_ITERS is now used for LSOR as a solver and as a
834        preconditioner. For the preconditioner, the default is set to 10.
835      - Jacobian times vector is computed with finite differences
836      - marginally related to JFNK-solver: add a smooth regularization for
837        zeta with tanh that will improve convergence (Lemieux and Tremblay,
838        2009) for any implicit solver (not implemented for EVP because EVP
839        does not need this regularization in the first place). Define
840        SEAICE_ZETA_SMOOTHREG in SEAICE_OPTIONS.h to use.
841    o eesupp/src:
842      - check in genmake2 that intrinsic S/R flush is available.
843      - add S/R to flush IO unit (if intrinsic S/R flush is available)
844      - flush standard & error msg unit before MPI termination
845      - if debugMode, flush IO unit after printing msg
846    o pkg/ctrl:
847      - ctrl_unpack.F, ALLOW_GENARR3D_CONTROL code: fix missing argument in call
848        to ctrl_set_unpack_xyz.
849    
850    checkpoint64 (2012/10/09)
851    o pkg/shelfice
852      - in mom_fluxform.F, mom_vecinv.F:
853        CALL SHELFICE_V_DRAG(bi,bj,k,vFld,KE,KappaRU,vF,myThid)
854        Bug fix KappaRU -> KappaRV
855        does not change verification/isomip but may change other setups
856        (presumably constant KappaRU=KappaRV)
857      - fix diagnostics SHIU/Vdrag (thanks to Tom Millgate)
858    o pkg/obcs:
859      - fixed some indexing bugs in obcs_seaice_sponge.F
860      - added obcs relaxation subroutines for HSALT and HSNOW
861      - changes verification/seaice_obcs/results/obcs_seaice_sponge.F
862  o pkg/seaice:  o pkg/seaice:
863    - add "multicategory" parameterization for snow in analogy to ice,    - add "multicategory" parameterization for snow in analogy to ice,
864      default is off for now.      default is off for now.

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