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revision 1.1573 by jmc, Sat Jan 14 16:41:36 2012 UTC revision 1.1599 by jmc, Wed Feb 15 22:13:48 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: remove (almost) all divisions by constants within loops
8      in seaice_growth.F and seaice_solve4temp.F, this changes (only) the cg2d
9      results of global_ocean.cs32x15.seaice from 16 to 11 digits (but only
10      those, caused by 1/QI -> recip_QI) -> update output.seaice.txt,
11      output_adm.seaice_dynmix.txt and also lab_sea: output_adm.evp.txt
12    o pkg/seaice :
13      - simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula.EQ.
14      1 or 2, using newly added run time parameter SEAICE_availHeatTaper.
15      - fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148.
16      - add permanent SItflux diag that corresponds to TFLUX but includes
17      ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget.
18      - allow activation/testing of a fix for suspected missing term in
19      ocn-ice heat budget (to be confirmed). To test this, you want to
20      undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param
21      SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic.
22      - no change in results, fwd or ad.
23    o global_ocean.cs32x15/results: three changes following from the pkg/seaice commit below.
24      - switch to variable freezing point.
25           Results change : cg2d -> 1 digits; ad -> 3-6-6 digits.
26      - bug fix : the sublimation term that was missing is now activated.
27           Results change : cg2d -> 2 digits; ad -> 8-6-6 digits.
28      - bug fix : flooding sign term for SIsal0.NE.0.
29           Result change : cg2d -> 8 digits; ad -> 11-12-9 digits.
30    o pkg/seaice:
31      - unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT
32     is now the default, and the old default constant freezing point is recovered with
33     SEAICE_tempFrz0    = -1.96,
34     SEAICE_dTempFrz_dS = 0.,
35      - retire SEAICE_freeze that was the old way of specifycing the constant freezing point.
36      - remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there.
37      - bug fix (thanks to M. Losch) : the sublimation term that was missing is now
38     activated. To reproduce old results that had this bug define SEAICE_DISABLE_SUBLIM.
39      - bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211)
40     was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail).
41      - bug fix (thanks to O. Jahn) : area loss for melting  got messed up in
42     seaice_growth r149 for legacy branch (no results change).
43      - introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code from I. Fenty).
44      - results did not change except for global_ocean.cs32x15, mostly due to the switch
45      to variable freezing point (see above item for detail).
46    o pkg/thsice:
47      - fix and simplify interface to salt_plume pkg ; diagnose directly amount of
48        seawater freezing in thsice_calc_thickn (not used).
49    o pkg/seaice: turbulent flux term specification via run time params.
50      - replace CPP switches with run time switches to facilitate testing
51      - retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX, GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
52      - added runtime parameter : SEAICEturbFluxFormula
53      - move Mcphee constants to SEAICE_PARAMS.h
54      - seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula;
55        SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply); remove
56        seaice_summary call (moved to seaice_init_fixed)
57      - seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on
58        SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms)
59      - seaice_summary.F : add missing report of read turbulent flux term set up (and SITRACER).
60      - seaice_check.F : check range; inform and stop if retired CPPs are used (incl. SEAICE_AGE).
61      - seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without
62            CPP switch, same computation as before for the different options.
63      - change results at the truncation level.
64    o pkg/seaice:
65      - remove un-used parameters LAD & MAX_TICE ; add new run-time parameters:
66        useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and
67        SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY.
68      - update verification/*/input*/data.seaice:
69        to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY
70        code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ;
71        and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code,
72        set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0.
73    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY):
74      - remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same
75        algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0);
76        difference in results only due to machine truncation.
77      - remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using
78        MaykutPolySatVap; keep MIN_LWDOWN.
79      - adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation.
80      - update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87,
81        + 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits).
82    o pkg/salt_plume:
83      - isolate saltPlumeFlux array exch into a specific S/R called from
84        do_oceanic_phys.F
85      - add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice.
86    o verification:
87      - move untested set-up to MITgcm_contrib/verification_other.
88    o pkg/seaice:
89      - retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER.
90    o pkg/seaice:
91      - seaice_solve4temp.F (keeping results unchanged):
92        * add 2 future run-time params to select which saturation vapor pressure
93          formula is used and how post-iteration fluxes are set.
94          Temporary set these 2 params according to option SOLVE4TEMP_LEGACY;
95        * New piece of code (not used) to update surf. atmos. heat flux F_ia using
96          the linearized expression to stay consistent with tsurf finding.
97      - seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x
98        can be < 0.
99    o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef):
100      - remove from F_ia (and from it's derivative dFiDTs1) the contribution of
101        conductive heat flux F_c , and add it explicitly when updating tsurf as
102        solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf
103        so that now F_ia has a consistent meaning through the entire routine.
104        This causes differences at truncation level: update output of fwd exp.
105        global_ocean.cs32x15.seaice.
106    o pkg/seaice:
107      - lots of editing/cleaning in seaice_solve4temp.F + better documentation
108        of arrays, sign/direction of fluxes; no effect on results.
109      - replace hard coded 273.16 (=previous value of celsius2K) by celsius2K
110        in seaice_budget_ocean.F & seaice_solve4temp.F (SOLVE4TEMP_LEGACY part);
111        note: this should have been done before changing celsius2K default.
112      - to keep results unchanged, add back old value of celsius2K in verification
113        exp. input*/data : lab_sea (AD), offline_exf_seaice (fwd+AD) & seaice_obcs
114      - replace hard coded seawater freezing temp in seaice_solve4temp.F (part
115        SOLVE4TEMP_LEGACY) of 271.20 (=previous value of celsius2K + default
116        value of SEAICE_freeze) by celsius2K+SEAICE_freeze so that seawater
117        freezing temp is consistent with value in seaice_growth.F ; this causes
118        differences at machine truncation level: update lab_sea AD output (3/4).
119    o pkg/seaice:
120      - mask (in exf_init_fixed.F) atemp,aqh,evap,precip,runoff,lwflx,areamask
121        and climsst/sss even when using seaice (to prevent calculation that might
122        use SST on land); does not affect any verification exp.
123      - apply mask to taux,tauy (in seaice_get_dynforcing.F); update output
124        of lab_sea.fd & lab_sea.hb87 and global_ocean.cs32x15.seaice_dynmix.
125    o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness
126      over land (non-legacy code)
127    o vectorize salt_plume package:
128      - add extra code to salt_plume_frac and salt_plume_tendency_apply_s
129      - this code computes plumebk everywhere (also over land), thus requires
130        code to avoid divisions by zero and catch the case of kLev=Nr.
131      - efficiency of salt_plume_frac is still sub-optimal
132    o tools (genmake2):
133      - fix makefile NAME specification (option: -makefile NAME) by adding
134        "-f $MAKEFILE" in few places where it was missing including makedepend
135        command (contribution from Paul).
136    
137    checkpoint63i (2012/01/24)
138    o model/src:
139      - add factorized versions of some EOS code to find_rho.F,
140        define USE_FACTORIZED_EOS to turn it on (default for TARGET_NEC_SX)
141    o model/src:
142      - add celsius2K to namelist PARM01; remove unused recip_rhoNil from PARAMS.h;
143      - change default celsius2K from 273.16 to 273.15
144      - to keep results unchanged, add back old value of celsius2K in verification
145        exp. input*/data : aim.5l_cs, 1D_ocean_ice_column, lab_sea (fwd),
146         global_ocean.cs32x15(seaice) & cpl_aim+ocn(input_atm).
147    o model/src: add a little initialisation trick to find_rho.F and find_alpha.F
148      to make TAF generate vectorizable code
149    o pkg/seaice/seaice_evp.F: add code (copied from CICE) that avoids underflows.
150       Turn on by defining SEAICE_EVP_ELIMINATE_UNDERFLOWS. Most compilers
151       have flags that do this more efficiently.
152    o pkg/diagnostics/diagstats_calc.F
153      - for TARGET_NEC_SX fix the treatment of the scaling factor tmpFac=scaleFact
154    o pkg/obcs (with exch2):
155      - derive OB indices in overlap region from OB-InsideMask (in obcs_init_fixed.F)
156        and remove code (in obcs_readparms.F) which was based on EXCH of indices
157        (through buffer) and did not account for exch2 (e.g., CS-grid) topology.
158    o pkg/exf and seaice exp:
159      - change offline_exf_seaice.seaicetd test exp. to use default DIFF1 value (=0)
160        so that switching off area & heff advection flags does not affect results.
161      - change default EXF_LWDOWN_WITH_EMISSIVITY to #define in EXF_OPTIONS.h
162      - keep exp. seaice_obcs & 1D_ocean_ice_column(ad) unchanged (using #undef
163        EXF_LWDOWN_WITH_EMISSIVITY) and, using pkg/exf default emissivities, update
164        results of verification experiments: 1D_ocean_ice_column(fwd),
165        global_ocean.cs32x15.seaice(fwd+ad) & seaice_dynmix(ad), lab_sea (all 8)
166        and offline_exf_seaice (all 4).
167  o pkg/seaice:  o pkg/seaice:
168    - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;    - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;
169      remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.      remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.
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