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revision 1.1774 by mlosch, Fri Nov 23 15:54:18 2012 UTC revision 1.1877 by dgoldberg, Wed Jun 12 22:07:23 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/streamice:
8      - This is a new package in MITgcm, which solves dynamic equations for ice
9         sheets and ice streams
10      - At the moment it is independent of atmosphere/ocean dynamics, or any
11        other physical packages in MITgcm, even ShelfIce (although it is anticipat-
12        ed that this will change)
13      - There is a new verification exercise that tests it, halfpipe_streamice,
14        evolves a 40x80 km ice stream/ice shelf (at coarse resolution) in a
15        rectangular embayment
16      - halfpipe_streamice is forward-only for now, will have TAF test soon
17      - for questions, email dgoldber@mit.edu
18    o pkg/thsice:
19      - fix filling of snow-precip diagnostic (SIsnwPrc) (left from the removing
20        of snowPrc from common bloc, on May 2nd, thsice_step_fwd.F revision 1.40);
21      - remove diagnostics 'SI_FrcFx' ( now identical to 'SI_Fract' with new
22         call sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect );
23      - allow precip from pkg/cheapaml to make snow over seaice.
24    o pkg/cfc:
25      - move in separated header file (CFC_ATMOS.h) time-serie arrays of Atmos CFC
26      - remove atmos CFC 2-D arrays from common bloc (now local variables)
27      - change some hard-coded constant to run time parameter for reading and
28        and interpolating atmospheric CFC ; keep same default as previously.
29      - more flexible reading of Atmos CFC (number of records no longer hard-coded)
30      - put arguments in standard order: myTime, myIter, myThid
31      - use standard S/R GET_PERIODIC_INTERVAL for time interpolation of
32        atmospheric CFC ; fix for the case myIter < PTRACERS_iter0.
33      - fix calculation of surf tendencys for partial-cell and/or Non-Lin Free-Surf
34      - new routine to print summary of CFC params and check for consistency.
35    o pkg/cfc:
36      - change time interpolation for atmospheric CFC-11 (now same as for CFC-12);
37        update output (CFC-11) of experiment cfc_example and tutorial_cfc_offline.
38      - fix interpolation of atmphspheric CFC between Sorthern and Northern
39        hemisphere value.
40    o pkg/seaice:
41      - allow to use seaice dynamics without pkg/exf (e.g., using pkg/cheapaml)
42    o pkg/seaice: add Adams-Bashforth2 time discretization for ice dynamics;
43                  so far only for JFNK-solver, turn on with SEAICEuseAB2 = .TRUE.
44      - requires an additional time level that is stored in the pickup
45      - you can start with AB2 from a pickup without this time level with
46        pickupStrictlyMatch = .false.
47    
48    checkpoint64h (2013/05/26)
49    o pkg/cheapaml:
50      - replace one ()**.5 with SQRT + use temp var "cdu = tau/Du" (coare3_flux);
51        affect machine truncation (but exp cheapAML_box still pass with 13 digits).
52      - consistent treatment of uWind,vWind location: assume everywhere in
53        pkg/cheapaml that they are on C-grid (@ uVel,vVel location)
54        (Note: was already the case for Tair,Qair advection);
55        add option (INCONSISTENT_WIND_LOCATION) to recover old results.
56      - compute diabatic forcing only in the interior (excluding overlap regions)
57      - fill in array "Qsw" (for short-wave heating);
58      - add diagnostic for precip ; fill-in diagnostics for cheapAML state vars
59        before any update (consistent with MITgcm state var diagnostics);
60      - cheapaml_fields_load.F & cheapaml_init_varia.F : only fill outer edges if
61        non periodic ; + adjusted for uWind,vWind (C-grid).
62    o pkg/seaice:
63      - remove dependence of pkg/seaice versus pkg/exf (file: pkg/pkg_depend) and
64        add explicitly pkg/exf in experiments that currently use pkg/seaice.
65      - allows to compile pkg/seaice without pkg/exf.
66    o tools/OAD_support:
67      - use a local copy (ourRWCPinBd) to ensure index ourRWCP stays within bounds
68        of array "ourStepOf" in function rvNextAction (revolve.F90).
69    o pkg/aim_compon_interf renamed to pkg/atm_compon_interf
70      - change pkg name (to be used with other atmospheric physics pkg)
71        but by-pass CVS when making the new pkg so that we keep the CVS history.
72    o pkg/offline:
73      - call OFFLINE_FIELDS_LOAD from pkg/offline/offline_init_varia.F
74        (previously called from pkg/dic_surfforcing_init.F)
75    o model/src:
76      - re-order sequence of calls within packages_init_variables.F, using
77        standard order, except for:
78         DIAGNOSTICS_INIT_VARIA and OFFLINE_INIT_VARIA (called @ the top),
79         CTRL_MAP_INI and OBCS_INIT_VARIABLES (called @ the bottom)
80    o new pkg: atm_phys
81      - add entry point and source code (previously in contrib
82          verification_other/atm_gray/code_gray/) for new pkg "atm_phys"
83        (atmospheric physics pkg from P. O'Gorman and T. Schneider, JCl, 2008).
84      - re-order sequence of calls within packages_readparms.F,
85         packages_init_fixed.F and packages_write_pickup.F
86        (but skip packages_init_variables.F because of TAF issues).
87      - update contrib/*/atm_gray/ experiment.
88    o pkg/seaice (ITD code):
89      - simplify and fix the writing of pickup-files for ITD case
90    o pkg/seaice (ITD code):
91      - introduce floe size dependent lateral melt for ITD case;
92      - cleaning (avoid division by zero, change to f77 syntax, remove tabs)
93      - update seaice_itd experiment main output.
94    o pkg/thsice:
95      - remove snowPrc from common block THSICE_FLUX, in THSICE_VARS.h and
96        declared it locally (without bi,bj) in thsice_main.F & aim_do_physics.F;
97        changed accordingly pkg/atm2d.
98    
99    checkpoint64g (2013/05/01)
100    o pkg/exf ALLOW_RUNOFTEMP
101      - if defined,  river and glacier runoff temperature can be read-in from
102        runoftempfile; runoftempfile needs to have same format as runofffile
103    o pkg/thsice (& pkg/bulk_force):
104      - In case Energy-Reference-Level (ERL) is used (temp_EvPrRn=0), account
105        for energy content of Precip + RunOff & Evap (like with pkg/exf).
106      - change computation domain to always be the interior (without overlap).
107      - fix bug (wrong overlap) when using EXF and stressReduction > 0.
108    o verification/tutorial_global_oce_biogeo:
109      - add preliminary OpenAD setup (still has problems)
110    o pkg/seaice:
111      - turn some parameters for choosing the convergence criterion of
112        the inexact Newton method (JFNK) into runtime parameters for convenience
113      - clean up seaice_calc_viscosities.F: remove/retire two options for
114        SEAICetaZmethod (1,2), introduce area weighting for method 3; this changes
115        the results of lab_sea/input because a division has been replaced by
116        a multiplication with the reciprocal (sumNorm)
117      - modify offline_exf_seaice/input.dyn_jfnk/data.seaice to improve
118        convergence of solver (changes results, of course), and to test some
119        new features
120    o model/src:
121      - remove unused (since Aug 2006) S/R SET_WRITE_GLOBAL_PICKUP and its call.
122      - remove unused forcing field "dQdT" and associated parameter "dQdTFile".
123      - move forcing adjustment (balancing surface forcing) in specific S/R
124        where might also be applied exchanges (if needed) to forcing arrays.
125    o pkg/shelfice:
126      - allow to specify the Ice-Shelf mass per unit area (instead of
127        shelficeLoadAnomaly) and do the conversion from one to the other
128      - move loading from file of shelficeLoadAnomaly from SHELFICE_INIT_VARIA
129        to SHELFICE_INIT_FIXED: (a) avoid some TAF recompution issues and
130        (b) will be loaded in time (before calling INI_PRESSURE) in case it is
131        needed in phi0surf for initial pressure calculation when useDynP_inEos_Zc
132      - update isomip experiment forward output (get machine truncation error
133        from conversion shelficeLoadAnomaly -> shelficeMass -> shelficeLoadAnomaly)
134    o verification/offline_exf_seaice:
135      revise data.seaice in input.thermo and input_ad and update results accordingly
136        HO = 0.2, SEAICE_areaLossFormula = 2,
137        SEAICE_growMeltByConv = .TRUE.,
138        SEAICE_doOpenWaterMelt = .TRUE.,
139      Improve consistency with input.thsice and fix the spurious 500m ice corners
140    o verification/global_ocean.cs32x15:
141      - set Energy Reference Level to liq. water @ 0 degC: temp_EvPrRn=0.,
142        in icedyn (thsice+seaice-dyn) test and update output.
143    o verification/offline_exf_seaice:
144      - adjust list of tested variables (with testreport) and update
145        standard test output with better slection of monitored fields.
146    o pkg/cd_code:
147      - swtich off Adams-Bashforth on the 1rst iteration. Update output of
148        experiment lab_sea.hb87
149    o tools/genmake2:
150      - change default makedepend from the system default to tools/xmakedepend:
151        When no makedepend is specified, select tools/xmakedepend it the test pass,
152        otherwise select the system default (if exist and pass the test) or
153        try to build cyrus-makedepend ; stop if none of the 3 works.
154    o pkg/exf & pkg/thsice:
155      - In case Energy-Reference-Level (ERL) is used (temp_EvPrRn=0), account
156        for energy content of Precip + RunOff & Evap. Assumes:
157       1) Rain has same temp as Air.
158       2) Snow has no heat capacity (consistent with seaice & thsice pkgs)
159       3) Run-Off comes at the temp of surface water (with same Cp)
160       4) Evap over ocean is released to the Atmos @ surf-temp (=SST); should be
161        put directly into Latent Heat flux & should use water-vapor heat capacity.
162       5) Evap over snow/seaice (pkg/thsice) assumes constant Lf+Lv (consistent
163        with snow having no Cp) => water vapor is released to Atmos @ 0^oC (=ERL).
164    o pkg/seaice: simplify the use of CPP flags in JFNK-related files
165        (compile when SEAICE_ALLOW_JFNK is defined)
166    o pkg/thsice:
167      - fix oceanic flux diagnostics & timeave (left from new sequence of calls
168        implementation): move THSICE_AVE call after the advection (called directly
169        from thsice_do_advect.F).
170    o verification/global_ocean.90x40x15 and OpenAD:
171      New experiment for OpenAD is identical to the one in input_ad except that
172        multiDimAdvection=.FALSE.,
173      There is still an issue with this.
174    o pkg/thsice:
175      - account for ice velocity (ocean relative velocity) in turbulent heat flux
176        at the base of the ice; update output of global_ocean.cs32x15 (icedyn)
177        and offline_exf_seaice (main test).
178    
179    checkpoint64f (2013/03/31)
180    o verification/OpenAD:
181      - new (smaller, without OAD_DEBUG) output_oadm.txt generated using gfortran.
182    o verification/isomip, pkg/shelfice and OpenAD:
183      - add OpenAD setup to this exp and make shelfice package work with OpenAD
184    o verification/tutorial_global_oce_biogeo:
185      - update AD and TLM output after turning off ALLOW_FE (in DIC_OPTIONS.h)
186    o verification/offline_exf_seaice:
187      - replace adjoint experiment (now similar to fwd input.thermo/ setup).
188    o verification/tutorial_tracer_adjsens, pkg/ptracers and OpenAD:
189      - add OpenAD setup to this exp and make ptracers package work with OpenAD
190    o pkg/seaice/seaice_evp.F:
191       mask the asymmetric contribution of the ice-ocean stress (when
192       the turningAngle is non-zero) over open water to avoid stripes
193       in the EVP-solutions after many EVP-substeps. This does not change
194       the verification experiment (because turningAngle=0 in that experiment),
195       but will affect other EVP solutions with turningAngle.ne.0
196    o verification, AD & TLM output:
197      - new TAF version 2.3.10 (previously 2.3.8) add more parenthesis in multiple
198        additions and multiplications which affect results at machine truncation
199        level. Update few AD output (1D_ocean_ice_column, bottom_ctrl_5x5,
200        lab_sea.noseaicedyn & offline_exf_seaice) and TLM output
201        (1D_ocean_ice_column & tutorial_tracer_adjsens.som81) which had only 12
202        digits of matching.
203    o pkg/seaice:
204       modify lsr-algorithm so that it vectorizes AND converges by using a
205       "zebra" method: split vector loop into two with step size 2; this
206       solves a general convergence problem for the JFNK solver on a vector
207       computer. It has the potential to even improve convergence for
208       non-vector machines, but it does change the results so it is turned
209       off by default. To turn on define CPP-flags SEAICE_VECTORIZE_LSR and
210       SEAICE_VECTORIZE_LSR_ZEBRA in SEAICE_OPTIONS.h
211    
212    checkpoint64e (2013/03/05)
213    o pkg/ecco and several verification experiments:
214       Remove special versions of the_model_main.F, the_main_loop.F, forward_step.F
215       from ecco package, and revert to unified routine in model/src/
216       Adjust verification experiments accordingly, especially gloal_oce_llc90
217       Should conclude long-standing work by Gael to reconsile the_main_loop with
218       ECCO and will enable OpenAD's revolve loop in ECCO setup.
219    o pkg/generic_advdiff:
220      - implement compressible flow method for multi-dim advection (similar to
221        gad_som_advect.F); add new option "GAD_MULTIDIM_COMPRESSIBLE" (since
222        TAF generates many recomputations) to use it; no yet coded with implicit
223        vertical advection.
224      - change experiment advect_cs (new output) and advect_xy (same output)
225        to test compressible flow multi-dim advection.
226    o pkg/generic_advdiff:
227      - fix SOM advection for unusual cases (linear Free-Surf in r*, other
228        cases where linear Free-Surf is not @ k=1, e.g., useShelfIce)
229    o pkg/seaice:
230      - fix bug in the no-slip implementation in seaice_calc_strainrates.F, this
231        bug affects two verification experiments (lab_sea and lab_sea.hb87),
232        recover old (wrong) results by setting noSlipFac = 2. in
233        seaice_calc_strainrates.F;
234      - add another averaging method for etaZ (etaZmethod=3), a mix of 2 and 0
235      - add runtime parameter SEAICE_JFNKepsilon for that finite difference
236        gradient in the Jacobian times vector operation (s/r seaice_jacvec)
237      - fix line search in seaice_jfnk.F (s/r seaice_jfnk_update)
238    o pkg/seaice: reorganize seaice_lsr.F to be able to reuse more code:
239      - new subroutines seaice_lsr_tridiagu/v
240      - introduce loop bounds i/jmin/max to be able to use a restricted
241        additive Schwarz method, but not used for now.
242      - rename SEAICE_CALC_LSR_COEFFS into SEAICE_LSR_CALC_COEFFS
243      - use new subroutines seaice_lsr_tridiagu/v in s/r seaice_preconditioner
244    o OpenAD support
245       Reorganize S/R call for overall time-stepping loop to facilitate
246       OpenAD revolve loop replacement
247       (new S/R main_do_loop.F)
248    o model/src:
249      - add 3-D array 3rd dimension to argument list of S/R ADAMS_BASHFORTH2/3;
250      - pkg/cheapaml: remove local S/R ADAMS2d and use instead standard S/R
251        ADAMS_BASHFORTH2.
252    o pkg/cheapaml:
253      - add new parameter (default=F, same as before) to disable full domain
254        (including land) periodicity in X & Y dir.
255      - new S/R CHEAPAML_COPY_EDGES to copy relaxation field into edges of
256        prognostics field ; merge the 2 S/R cycle_2d_tracer and timestep_2d_tracer
257        into single S/R CHEAPAML_TIMESTEP.
258    
259    checkpoint64d (2013/02/17)
260    o pkg/monitor (angular momentum):
261      - do not add Eta contribution to the total AM if using rigid-lid;
262      - correct for Adams-Bashforth in zonal-wind part (instead of in AM_eta).
263      - horizontal discretisation: compute Zonal wind contribution separately for
264        each component (instead of from cell centered averaged) and use the 4
265        grid-cell corner averaged value of Omega*(R*cos_Phi)^2 in AM_eta part.
266      - Check that AM is conserved with linear dynamics (momAdvection=F and linear
267        FreeSurf) if using vectorInvariant momentum.
268    o model/src (horizontal grid):
269      - move initialisation of all horizontal grid arrays to null value
270        from specific horizontal grid S/R to main S/R INI_GRID;
271      - add 2 new arrays to project model C-grid velocity on to zonal direction
272        (similar to AngleCosC & -AngleSinC but at U and V point location) and
273        compute them in S/R CALC_GRID_ANGLES.
274    o pkg/seaice: replace a hard coded parameter by a runtime parameter
275        SEAICE_JFNK_tolIter
276    o pkg/seaice: introduce a restricted additive Schwarz (RAS) method in
277        preconditioner for JFNK (run LSR into the overlaps as far as possible,
278        i.e OLx/y-2, but overwrite the solution in the overlaps)
279      - extend loop range in seaice_calc_viscosity
280      - add new parameters SEAICE_OLx/y (default = OLx/y-2)
281      - add flexible loop ranges to seaice_preconditioner, seaice_calc_lsr_coeffs
282      - slightly modify loops in tridiagonal solver lsr-preconditioner
283      - by default remove the extra exchange in seaice_preconditioner with a
284        replacement of an undocumented CPP flag by SEAICE_PRECOND_EXTRA_EXCHANGE
285      - modify offline_exf_seaice so that old results without RAS are reproduced
286        for output.dyn_jfnk.txt
287      in seaice_fgmres.F (unrelated to RAS)
288      - add a cpp-flag option for a re-ordered mapping (potentially more
289        efficient), but because this changes the results, turn it off by
290        default
291      - replace the save statement by local common blocks
292    o utils/matlab:
293      - fix tile-offset in rdmnc.m when output was produced using EXCH2.
294      - update cs_grid/bk_line scripts to use load_grid.m (in utils/matlab)
295        instead of local script "load_cs.m".
296    o pkg/seaice:
297      - fix a serious bug in seaice_fgmres.F, s/r seaice_scalprod, connected
298        to the scalarProductMetric and the unrolling. By chance this does not
299        change the verification experiment, because of the particular domain
300        decomposition
301    o pkg/diagnostics:
302      - change default missing_value from UNSET_RL to -999.
303    o pkg/layers: improve vectorization of layers_fluxcalc.F
304      - step 1: split loops, make TatU/V 2D arrays. This alone reduces the cpu
305        time spent in this routine by more than a factor of 3 on an NEC-SX8
306      - step 2: replace search algorithm by a bisection algorithm found in
307        Press et al. Numerical Recipes in Fortran. This algorithm can be
308        vectorized and finds the correct bin in approx. log2(Nlayers) steps.
309        For now, use this algorithm only for TARGET_NEC_SX defined.
310      - moved the search algorithm into a separate subroutine, that is kept
311        within the same file for automatic inlining.
312      - modified catching potential errors
313    o pkg/ecco:
314      - add compile switches ALLOW_SHALLOW_ALTIMETRY and ALLOW_HIGHLAT_ALTIMETRY.
315    o model/src, pkg/autodiff, pkg/ctrl, pkg/grdchk :
316      - modifications for ALLOW_GENTIM2D_CONTROL
317      -- forward_step.F, the_main_loop.F : pass options and arrays for adjoint tapes.
318      -- load_fields_driver.F : add call to CTRL_MAP_GENTIM2D( myTime, myIter, myThid )
319      -- add xx_gentim2d0/1 in ctrl_ad_check_lev1_dir.h checkpoint_lev1_directives.h etc
320      -- use ctrl_swapffields.F (new) instead of exf_SwapFFields.F in ctrl_get_gen.F
321    o model/src:
322      - account for moist thermodynamics in (dry) potential temperature equation;
323        update results of experiments: aim.5l_cs (x2), fizhi-cs (std + aqualev)
324        and cpl_aim+ocn.
325      - also switch to standard compiler (gfortran, was using ifort previously)
326        for fizhi-cs experiments reference output.
327    o pkg/ctrl:
328      - 1st step toward generic time-varying control variable (2D) via CPP option
329        ALLOW_GENTIM2D_CONTROL
330      - note new namelist ctrl_nml_genarr in data.ctrl
331    o verification/global_ocean.cs32x15:
332      - switch off OLD_THSICE_CALL_SEQUENCE (both forward and AD code) to use new
333        thsice calling sequence and update "output.icedyn.txt" output file.
334    o pkg/ptracers:
335      - from Ryan A.: code to allow to restart a tracer at regular time interval
336        specifying a reset frequency and a reset-phase (for each tracers).
337    o pkg/thsice:
338      - implement new sequence of calls for thsice+seaice:
339          previously:   ice-Dyn,ice-Advect,ice-Thermo(thsice)
340          new sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect
341      - allows (with temporary CPP option "#define OLD_THSICE_CALL_SEQUENCE"
342        in CPP_OPTIONS.h) to recover old sequence;
343      - update diagnostics for Intermediate State thsice diagnostics: now filled
344        just before advection (instead of just after advection in old sequence);
345      - update output of experiment offline_exf_seaice (standard test);
346      - in global_ocean.cs32x15 exp., postpone output.icedyn.txt update
347        by setting #define OLD_THSICE_CALL_SEQUENCE in CPP_OPTIONS.h
348    o pkg/aim_v23:
349      - use tiled array for aim_CO2 and surface wind speed for export to coupler;
350      - use standard pkg/mdsio routines to read & write CO2 pickup file;
351      - in-line S/R AIM_AIM2DYN_EXCHANGES in aim_do_physics.F;
352      - Implement new sequence of calls for seaice advection (with thsice and
353        seaice diffusion): do ice advection after ice-Thermodynamic (previously
354        was done before); change aim_do_physics.F (split the bi,bj loops block);
355      - use same CPP option (OLD_THSICE_CALL_SEQUENCE) to recover old sequence;
356    o pkg/thsice:
357      - add a missing EXCH of sIceLoad in thsice_main.F (ocean set-up) for the case
358        where just seaice diffusion is used without seaice-dynamics.
359    
360    checkpoint64c (2013/01/18)
361    o pkg/seaice:
362      - add a parameter JFNKres_tFac that can replace JFNKres_t
363        (= JFNKres_tFac*JFNKresidual before JFNK solver)
364      - add a line search option to the JFNK solver
365      - move update of u/vIce and computation of initial residual into a separate
366        routine (same file); makes the code a little easier to read (?)
367      - the line search requires computation of the residual and for some reason
368        I cannot do the update of u/vIce at the beginning of the Newton loop
369        without changing the results, so we move computation of the new residual
370        also to the end of the Newton loop, even without the line search
371    o pkg/mdsio:
372      - write missing value (corresponding to undefined array value) to meta files;
373        skip this if missing value is one (UNSET_RL would be a better value for the
374        case of undefined missing value but it's current the default missing-value);
375        Also update mdsio_read_meta.F (reading timeInterval & missing-value).
376    o pkg/exf & thsice:
377      - for diagnostics purpose, fill-up and update Qsw array (+ fill the
378        diagnostics) even when SHORTWAVE_HEATING is #undef;
379    o verification/cfc_example:
380      - turn on pkg/layers with pkg/diagnostics (to test pkg/layers and to
381        illustrate how to use it).
382    o verification/offline_exf_seaice:
383      in input: add SEAICErestoreUnderIce=.TRUE., and reduce size of forcing
384        files to only one time-record.
385      in input.thermo: narrow the 2 bands of low initial ice-concentration near
386        N & S edges; switch on SEAICErestoreUnderIce=T; use pkg/diagnostics for
387        snapshot output; same mcPheePiston value as in thsice with
388        surf-current=0.2m/s.
389      in input.thsice: similar set-up as in input.thermo (channel with same seaice
390        initial conditions).
391    o verification/cfc_example:
392      - update file "data" with more standard choice (default rotationPeriod,
393        exactConserv=T, reduce ivdc_kappa to 10, remove multiDimAdvection=F,
394        set deltaTFreeSurf to deltaTtracer) and update the output.
395    o pkg/layers:
396      - fix bolus part so that it compiles with #undef GM_BOLUS_ADVEC;
397      - ensure that "layers_bolus" is switched to False when useGMRedi=False.
398    o verification/offline_exf_seaice:
399      - set all {field}period to zero for constant-in-time forcing (not tested
400        anywhere else).
401    o verification/offline_exf_seaice:
402      - dyn_lsr  : use pkg/seaice S/R (instead of pkg/thsice) to advect sea-ice;
403      - dyn_jfnk : use pkg/thsice S/R (instead of pkg/seaice) to advect sea-ice.
404    o model/src:
405      - implement Finite-Volume method for (hydrostatic) presure gradient
406        from S.-J. Lin (QJRMS 1997), for atmosphere using sigma-coordinate.
407    o pkg/seaice: implement EVP* by Lemieux et al. (2012).
408      - In order to be compatible with the default EVP code, this requires changing
409        the EVP code around a little; and because any small change immediately
410        breaks the lab_sea.hb87 verification experiment, the reference output is
411        updated two times (each time the remaining aggrement was only 2 digits):
412        - after replacing 1/dt by 1*recip_dt with a precomputed recip_dt
413        - after replacing 1/(1+0.5*dt/tau) by a/(a+1), with a=2*tau/dt
414        The adjoint test lab_sea.evp also needed to be updated.
415      - Turn on EVP* by setting SEAICE_deltaTevp as before, and setting
416        SEAICEuseEVPstar=.true.; for EVP* SEAICE_deltaTevp does not need to be
417        a factor of SEAICE_deltaTdyn, and you can set the number of EVP steps
418        explicitly with SEAICEnEVPstarSteps (thereby overriding the default of
419        INT(SEAICE_deltaTdyn/SEAICE_deltaTevp)). Controlling EVP* is deliberately
420        kept obscure, because I need to test it a little more.
421    o pkg/cheapaml:
422      - fix few incorrect type (_RL/_RS) in subroutine calls.
423    o pkg/seaice:
424      - new S/R SEAICE_MAP_RS2VEC (similar to SEAICE_MAP2VEC) to map _RS arrays
425        to _RL vector; this fixes JFNK code when compiling with "-use_r4" option.
426    o model/src:
427      - add a warning if using select_rStar=2 with nonlinFreeSurf <> 4;
428        change (in input_ad*/data) select_rStar from 2 to 1 for AD verification
429        experiments global_ocean.cs32x15 & tutorial_tracer_adjsens (+ update output)
430    o pkg/cheapaml:
431      - replace "273.1 _d 0" by celsius2K in pkg/cheapaml/cheapaml.F and
432        update output of experiment cheapAML_box.
433      - store in CHEAPAML.h coeffs ssq[0:2] for saturation specific humidity,
434        and set them only in one place (cheapaml_readparms.F).
435      - replace "273.16 _d 0" by celsius2K & replace "3.14159 _d 0" by constant "PI"
436      - remove re-setting of main-model parameter "celsius2K" (in cheapaml_readparms)
437        and re-setting of cheapAML params "lath" & "p0" (in cheapaml_init_varia).
438    o model/src/the_main_loop.F:
439      - fix revision 129 : need both ALLOW_ECCO and ALLOW_ECCO_EVOLUTION.
440    o pkg/seaice:
441      - remove legacy branch code.
442      - retire SEAICE_GROWTH_LEGACY and SEAICE_CAP_HEFF accordingly.
443    o verification/*/code*/SEAICE_OPTIONS.h:
444      - remove documentation for retired CPP flags (SEAICE_GROWTH_LEGACY,
445        SEAICE_CAP_HEFF).
446    o pkg/cheapaml:
447      - use standard routine (S/R GET_PERIODIC_INTERVAL) to decide when it is time
448        to load new forcing fields.
449      - add missing "_d 0" where it's needed; + some editing (improve indentation).
450      - remove switch to "-r8" compiler option (no longer needed) in verification
451        cheapAML_box, keep same output (small trucation error differences).
452    o verification/offline_exf_seaice:
453      - add thermodynamics only test.
454    o verification/cheapAML_box:
455      - split the domain in 8 (2x4) tiles; add MPI and multi-threaded test;
456        keep same output (same 14 digits for cg2d).
457      - switch on "-r8" compiler option (some numerical values are missing
458        the "_d 0") and update output (only 6 digits for cg2d were preserved).
459    
460    checkpoint64b (2012/12/24)
461    o pkg/cheapaml:
462      - remove un-used variables (Qnet,EmPmR) from pickup files.
463      - store tendency of advected variables into cheapaml pickup file
464        and fix the AB-2 restart.
465    o verification/offline_exf_seaice and lab_sea adjoint:
466      - switch to new code (#undef SEAICE_GROWTH_LEGACY).
467      - switch to 4 time steps in offline, consistent with lab_sea.
468      - match parameters from SEAICE_GROWTH_LEGACY branch in data.seaice.
469      - update results after change of experiment seaice.
470    o pkg/seaice:
471      - remove option SEAICE_MULTICATEGORY; has been replaced with run-time
472        parameter SEAICE_multDim. Issue a warning if SEAICE_MULTICATEGORY is
473        still defined since SEAICE_multDim needs to be set to MULTDIM value (from
474        SEAICE_SIZE.h) to recover previous #define SEAICE_MULTICATEGORY default.
475    o model/src:
476      - add run-time parameter to select CG2D solver minimum-residual solution
477        (in case of a poor convergence).
478    o pkg/seaice/seaice_lsr.F
479      - move calculation of matrix coefficients into new
480        S/R SEAICE_CALC_LSR_COEFFS; for now this routine remains in the same
481        file; the main purpose of this change is to be able to reuse the code
482        in S/R SEAICE_PRECONDITIONER
483      - modify the computation of the residual so that the mass of sea-ice
484        is not used twice; this simplifies the calculations, but since
485        the residual is never used except when LSR_mixIniGuess.ge.4---and this is
486        not tested in testreport---this does not affect the testreport results.
487    o verification/seaice_obcs:
488      - disable SEAICE_GROWTH_LEGACY; reset input files to match those of
489        verification/lab_sea/input.salt_plume; changes results/output.txt*
490    o model/src:
491      - adapt quasi-hydrostatic formulation to work with p or p* coordinate.
492    o pkg/seaice:
493      - improve description of parameters in seaice_fgmres.F and start
494        cleaning up the code
495      - change name of SCALPROD to SEAICE_SCALPROD and modify meaning of
496        second argument
497      - add a metric based on grid cell area to SEAICE_SCALPROD; update
498        results of offline_exf_seaice.dyn_jfnk
499      - compute initial residual norm in seaice_jfnk based on SEAICE_SCALPROD
500    o pkg/aim_v23:
501      - fix an other bug in dissipation heating (grid-cell area was missing).
502    o model/src + pkg/seaice:
503      - add global (multi-tile) linear solver for pair of tri-diagonal system
504        along X and Y lines, respectively for U and V component.
505        Note: 1) MPI and cube-exchange not yet coded.
506            2) probably not accurate for poorly conditioned / large size problem.
507      - add option for SEAICE_LSR to use global (multi-tile) tri-diagonal solver;
508        default: not compiled and not used.
509    o pkg/seaice:
510      - first attempt at a multi-threaded fgmres solver for the JFNK solver:
511        introduce bi/bj loops and use global_sum_tile_rl instead of
512        mpi_allreduce in seaice_fgmres.F
513      - improve diagnostics output for fgmres solver (seaice_fgmres.F)
514      - replace a few unnecessary goto statements by if-blocks  (seaice_fgmres.F)
515      - add a verification experiment for JFNK in offline_exf_seaice
516    o verification:
517      - change (for now, only fwd test) offline_exf_seaice experiment:
518        use a re-entrant channel with idealized coastline (trapezoidal shape)
519        at southern boundary to explore seaice dynamics and thermodynamics
520        with simple forcing. Main set-up has dynamics+thermo and SST relaxation;
521        secondary test (input.thsice) use thermodynamics only with SST relaxation.
522      - add seaice-dynamics only secondary test using LSR and pkg/thsice advection.
523    o pkg/exf:
524      - disable "sstExtrapol" when Nr=1
525    o verification:
526      - add new experiment "cheapAML_box" (simple 1 layer set-up from Bruno Deremble)
527        to test pkg/cheapaml.
528    o pkg/aim_v23 & pkg/shap_filt:
529      - fix dissipation heating (erroneous gravity multiplication factor).
530    o pkg/seaice:
531      - remove unused field pressPre from jfnk solver
532      - rename two subroutines in seaice_preconditioner.F
533    o eesupp/src:
534       - S/R MDSFINDUNIT avoids reserved unit numbers (scrUnit1, eeDataUnit ...)
535  o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again  o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again
536     - remove wrong parts of the rhs and the lhs (were in there     - remove wrong parts of the rhs and the lhs (were in there
537       because I did not understand the concept of this preconditioner)       because I did not understand the concept of this preconditioner)

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