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revision 1.1573 by jmc, Sat Jan 14 16:41:36 2012 UTC revision 1.1607 by dimitri, Sun Mar 4 23:32:55 2012 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o pkg/seaice :
8      - final version of turbulent flux params, as agreed at MIT ice meet:
9           SEAICE_mcPheePiston (default is ~ 0.000875)
10           SEAICE_mcPheeTaper (default is 0.)
11           SEAICE_frazilFrac (defualt is 1.)
12           SEAICE_mcPheeStepFunc (default is false)
13      - changes results at trunction error level
14      - ifdef SEAICE_EXTERNAL_FLUXES, disallow SEAICE_waterAlbedo
15    o added pkg/frazil - see frazil_description.tex for details
16      - verification experiment is global_with_exf/input.yearly; changes output.yearly.txt
17    o pkg/shelfice/shelfice_thermodynamics.F
18      - fix exponents for velocity dependent exchange coefficients: change
19        from 2/3(=0) to 0.66666666666666667
20      - move computation of velocity dependent exchange coefficients into
21        separate loop, so that it applies to both thermodynamics
22      - move some divisions by constants out of loops
23    
24    checkpoint63j (2012/02/16)
25    o pkg/seaice:
26      - overhaul of seaice_summary.F after feb 2012 clean-up of seaice_growth.F etc.
27      - SItracer:  added run time params, and allow coupling to ocn salinity.
28    o pkg/seaice: remove (almost) all divisions by constants within loops
29      in seaice_growth.F and seaice_solve4temp.F, this changes (only) the cg2d
30      results of global_ocean.cs32x15.seaice from 16 to 11 digits (but only
31      those, caused by 1/QI -> recip_QI) -> update output.seaice.txt,
32      output_adm.seaice_dynmix.txt and also lab_sea: output_adm.evp.txt
33    o pkg/seaice :
34      - simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula
35        = 1 or 2, using newly added run time parameter SEAICE_availHeatTaper.
36      - fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148.
37      - add permanent SItflux diag that corresponds to TFLUX but includes
38        ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget.
39      - allow activation/testing of a fix for suspected missing term in
40        ocn-ice heat budget (to be confirmed). To test this, you want to
41        undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param
42        SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic.
43      - no change in results, fwd or ad.
44    o global_ocean.cs32x15/results: 3 changes following from the pkg/seaice commit below:
45      - switch to variable freezing point.
46           Results change : cg2d -> 1 digits; ad -> 3-6-6 digits.
47      - bug fix : the sublimation term that was missing is now activated.
48           Results change : cg2d -> 2 digits; ad -> 8-6-6 digits.
49      - bug fix : flooding sign term for SIsal0.NE.0.
50           Result change : cg2d -> 8 digits; ad -> 11-12-9 digits.
51    o pkg/seaice:
52      - unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT
53        is now the default, and the old default constant freezing point is recovered
54        with SEAICE_tempFrz0    = -1.96,
55             SEAICE_dTempFrz_dS = 0.,
56      - retire SEAICE_freeze (= the old way of specifycing the constant freezing point)
57      - remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there.
58      - bug fix (thanks to M. Losch) : the sublimation term that was missing is now
59        activated. To reproduce old results with this bug define SEAICE_DISABLE_SUBLIM.
60      - bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211)
61        was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail).
62      - bug fix (thanks to O. Jahn) : area loss for melting  got messed up in
63        seaice_growth r149 for legacy branch (no results change).
64      - introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code
65        from I. Fenty).
66      - results did not change except for global_ocean.cs32x15, mostly due to the
67        switch to variable freezing point (see above item for detail).
68    o pkg/thsice:
69      - fix and simplify interface to salt_plume pkg ; diagnose directly amount of
70        seawater freezing in thsice_calc_thickn (not used).
71    o pkg/seaice: turbulent flux term specification via run time params.
72      - replace CPP switches with run time switches to facilitate testing
73      - retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX,
74                       GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
75      - added runtime parameter : SEAICEturbFluxFormula
76      - move Mcphee constants to SEAICE_PARAMS.h
77      - seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula;
78                 SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply);
79                 remove seaice_summary call (moved to seaice_init_fixed)
80      - seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on
81        SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms)
82      - seaice_summary.F : add missing report of read turbulent flux term set up
83                           and SITRACER.
84      - seaice_check.F : check range; inform and stop if retired CPPs are used
85                         (incl. SEAICE_AGE).
86      - seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without
87             CPP switch, same computation as before for the different options.
88      - change results at the truncation level.
89    o pkg/seaice:
90      - remove un-used parameters LAD & MAX_TICE ; add new run-time parameters:
91        useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and
92        SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY.
93      - update verification/*/input*/data.seaice:
94        to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY
95        code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ;
96        and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code,
97        set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0.
98    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY):
99      - remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same
100        algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0);
101        difference in results only due to machine truncation.
102      - remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using
103        MaykutPolySatVap; keep MIN_LWDOWN.
104      - adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation.
105      - update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87,
106        + 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits).
107    o pkg/salt_plume:
108      - isolate saltPlumeFlux array exch into a specific S/R called from
109        do_oceanic_phys.F
110      - add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice.
111    o verification:
112      - move untested set-up to MITgcm_contrib/verification_other.
113    o pkg/seaice:
114      - retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER.
115    o pkg/seaice:
116      - seaice_solve4temp.F (keeping results unchanged):
117        * add 2 future run-time params to select which saturation vapor pressure
118          formula is used and how post-iteration fluxes are set.
119          Temporary set these 2 params according to option SOLVE4TEMP_LEGACY;
120        * New piece of code (not used) to update surf. atmos. heat flux F_ia using
121          the linearized expression to stay consistent with tsurf finding.
122      - seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x
123        can be < 0.
124    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef):
125      - remove from F_ia (and from it's derivative dFiDTs1) the contribution of
126        conductive heat flux F_c , and add it explicitly when updating tsurf as
127        solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf
128        so that now F_ia has a consistent meaning through the entire routine.
129        This causes differences at truncation level: update output of fwd exp.
130        global_ocean.cs32x15.seaice.
131    o pkg/seaice:
132      - lots of editing/cleaning in seaice_solve4temp.F + better documentation
133        of arrays, sign/direction of fluxes; no effect on results.
134      - replace hard coded 273.16 (=previous value of celsius2K) by celsius2K
135        in seaice_budget_ocean.F & seaice_solve4temp.F (SOLVE4TEMP_LEGACY part);
136        note: this should have been done before changing celsius2K default.
137      - to keep results unchanged, add back old value of celsius2K in verification
138        exp. input*/data : lab_sea (AD), offline_exf_seaice (fwd+AD) & seaice_obcs
139      - replace hard coded seawater freezing temp in seaice_solve4temp.F (part
140        SOLVE4TEMP_LEGACY) of 271.20 (=previous value of celsius2K + default
141        value of SEAICE_freeze) by celsius2K+SEAICE_freeze so that seawater
142        freezing temp is consistent with value in seaice_growth.F ; this causes
143        differences at machine truncation level: update lab_sea AD output (3/4).
144    o pkg/seaice:
145      - mask (in exf_init_fixed.F) atemp,aqh,evap,precip,runoff,lwflx,areamask
146        and climsst/sss even when using seaice (to prevent calculation that might
147        use SST on land); does not affect any verification exp.
148      - apply mask to taux,tauy (in seaice_get_dynforcing.F); update output
149        of lab_sea.fd & lab_sea.hb87 and global_ocean.cs32x15.seaice_dynmix.
150    o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness
151      over land (non-legacy code)
152    o vectorize salt_plume package:
153      - add extra code to salt_plume_frac and salt_plume_tendency_apply_s
154      - this code computes plumebk everywhere (also over land), thus requires
155        code to avoid divisions by zero and catch the case of kLev=Nr.
156      - efficiency of salt_plume_frac is still sub-optimal
157    o tools (genmake2):
158      - fix makefile NAME specification (option: -makefile NAME) by adding
159        "-f $MAKEFILE" in few places where it was missing including makedepend
160        command (contribution from Paul).
161    
162    checkpoint63i (2012/01/24)
163    o model/src:
164      - add factorized versions of some EOS code to find_rho.F,
165        define USE_FACTORIZED_EOS to turn it on (default for TARGET_NEC_SX)
166    o model/src:
167      - add celsius2K to namelist PARM01; remove unused recip_rhoNil from PARAMS.h;
168      - change default celsius2K from 273.16 to 273.15
169      - to keep results unchanged, add back old value of celsius2K in verification
170        exp. input*/data : aim.5l_cs, 1D_ocean_ice_column, lab_sea (fwd),
171         global_ocean.cs32x15(seaice) & cpl_aim+ocn(input_atm).
172    o model/src: add a little initialisation trick to find_rho.F and find_alpha.F
173      to make TAF generate vectorizable code
174    o pkg/seaice/seaice_evp.F: add code (copied from CICE) that avoids underflows.
175       Turn on by defining SEAICE_EVP_ELIMINATE_UNDERFLOWS. Most compilers
176       have flags that do this more efficiently.
177    o pkg/diagnostics/diagstats_calc.F
178      - for TARGET_NEC_SX fix the treatment of the scaling factor tmpFac=scaleFact
179    o pkg/obcs (with exch2):
180      - derive OB indices in overlap region from OB-InsideMask (in obcs_init_fixed.F)
181        and remove code (in obcs_readparms.F) which was based on EXCH of indices
182        (through buffer) and did not account for exch2 (e.g., CS-grid) topology.
183    o pkg/exf and seaice exp:
184      - change offline_exf_seaice.seaicetd test exp. to use default DIFF1 value (=0)
185        so that switching off area & heff advection flags does not affect results.
186      - change default EXF_LWDOWN_WITH_EMISSIVITY to #define in EXF_OPTIONS.h
187      - keep exp. seaice_obcs & 1D_ocean_ice_column(ad) unchanged (using #undef
188        EXF_LWDOWN_WITH_EMISSIVITY) and, using pkg/exf default emissivities, update
189        results of verification experiments: 1D_ocean_ice_column(fwd),
190        global_ocean.cs32x15.seaice(fwd+ad) & seaice_dynmix(ad), lab_sea (all 8)
191        and offline_exf_seaice (all 4).
192  o pkg/seaice:  o pkg/seaice:
193    - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;    - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;
194      remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.      remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.
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