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revision 1.1586 by jmc, Tue Jan 31 17:12:24 2012 UTC revision 1.1605 by dimitri, Sat Mar 3 16:04:38 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    o pkg/shelfice/shelfice_thermodynamics.F
17      - fix exponents for velocity dependent exchange coefficients: change
18        from 2/3(=0) to 0.66666666666666667
19      - move computation of velocity dependent exchange coefficients into
20        separate loop, so that it applies to both thermodynamics
21      - move some divisions by constants out of loops
22    
23    checkpoint63j (2012/02/16)
24    o pkg/seaice:
25      - overhaul of seaice_summary.F after feb 2012 clean-up of seaice_growth.F etc.
26      - SItracer:  added run time params, and allow coupling to ocn salinity.
27    o pkg/seaice: remove (almost) all divisions by constants within loops
28      in seaice_growth.F and seaice_solve4temp.F, this changes (only) the cg2d
29      results of global_ocean.cs32x15.seaice from 16 to 11 digits (but only
30      those, caused by 1/QI -> recip_QI) -> update output.seaice.txt,
31      output_adm.seaice_dynmix.txt and also lab_sea: output_adm.evp.txt
32    o pkg/seaice :
33      - simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula
34        = 1 or 2, using newly added run time parameter SEAICE_availHeatTaper.
35      - fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148.
36      - add permanent SItflux diag that corresponds to TFLUX but includes
37        ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget.
38      - allow activation/testing of a fix for suspected missing term in
39        ocn-ice heat budget (to be confirmed). To test this, you want to
40        undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param
41        SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic.
42      - no change in results, fwd or ad.
43    o global_ocean.cs32x15/results: 3 changes following from the pkg/seaice commit below:
44      - switch to variable freezing point.
45           Results change : cg2d -> 1 digits; ad -> 3-6-6 digits.
46      - bug fix : the sublimation term that was missing is now activated.
47           Results change : cg2d -> 2 digits; ad -> 8-6-6 digits.
48      - bug fix : flooding sign term for SIsal0.NE.0.
49           Result change : cg2d -> 8 digits; ad -> 11-12-9 digits.
50    o pkg/seaice:
51      - unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT
52        is now the default, and the old default constant freezing point is recovered
53        with SEAICE_tempFrz0    = -1.96,
54             SEAICE_dTempFrz_dS = 0.,
55      - retire SEAICE_freeze (= the old way of specifycing the constant freezing point)
56      - remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there.
57      - bug fix (thanks to M. Losch) : the sublimation term that was missing is now
58        activated. To reproduce old results with this bug define SEAICE_DISABLE_SUBLIM.
59      - bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211)
60        was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail).
61      - bug fix (thanks to O. Jahn) : area loss for melting  got messed up in
62        seaice_growth r149 for legacy branch (no results change).
63      - introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code
64        from I. Fenty).
65      - results did not change except for global_ocean.cs32x15, mostly due to the
66        switch to variable freezing point (see above item for detail).
67    o pkg/thsice:
68      - fix and simplify interface to salt_plume pkg ; diagnose directly amount of
69        seawater freezing in thsice_calc_thickn (not used).
70    o pkg/seaice: turbulent flux term specification via run time params.
71      - replace CPP switches with run time switches to facilitate testing
72      - retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX,
73                       GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
74      - added runtime parameter : SEAICEturbFluxFormula
75      - move Mcphee constants to SEAICE_PARAMS.h
76      - seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula;
77                 SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply);
78                 remove seaice_summary call (moved to seaice_init_fixed)
79      - seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on
80        SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms)
81      - seaice_summary.F : add missing report of read turbulent flux term set up
82                           and SITRACER.
83      - seaice_check.F : check range; inform and stop if retired CPPs are used
84                         (incl. SEAICE_AGE).
85      - seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without
86             CPP switch, same computation as before for the different options.
87      - change results at the truncation level.
88    o pkg/seaice:
89      - remove un-used parameters LAD & MAX_TICE ; add new run-time parameters:
90        useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and
91        SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY.
92      - update verification/*/input*/data.seaice:
93        to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY
94        code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ;
95        and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code,
96        set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0.
97    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY):
98      - remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same
99        algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0);
100        difference in results only due to machine truncation.
101      - remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using
102        MaykutPolySatVap; keep MIN_LWDOWN.
103      - adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation.
104      - update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87,
105        + 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits).
106    o pkg/salt_plume:
107      - isolate saltPlumeFlux array exch into a specific S/R called from
108        do_oceanic_phys.F
109      - add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice.
110    o verification:
111      - move untested set-up to MITgcm_contrib/verification_other.
112    o pkg/seaice:
113      - retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER.
114    o pkg/seaice:
115      - seaice_solve4temp.F (keeping results unchanged):
116        * add 2 future run-time params to select which saturation vapor pressure
117          formula is used and how post-iteration fluxes are set.
118          Temporary set these 2 params according to option SOLVE4TEMP_LEGACY;
119        * New piece of code (not used) to update surf. atmos. heat flux F_ia using
120          the linearized expression to stay consistent with tsurf finding.
121      - seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x
122        can be < 0.
123    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef):
124      - remove from F_ia (and from it's derivative dFiDTs1) the contribution of
125        conductive heat flux F_c , and add it explicitly when updating tsurf as
126        solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf
127        so that now F_ia has a consistent meaning through the entire routine.
128        This causes differences at truncation level: update output of fwd exp.
129        global_ocean.cs32x15.seaice.
130  o pkg/seaice:  o pkg/seaice:
131    - lots of editing/cleaning in seaice_solve4temp.F + better documentation    - lots of editing/cleaning in seaice_solve4temp.F + better documentation
132      of arrays, sign/direction of fluxes; no effect on results.      of arrays, sign/direction of fluxes; no effect on results.
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