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Notes on tags used in MITgcmUV |
Notes on tags used in MITgcmUV |
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o pkg/seaice: remove (almost) all divisions by constants within loops |
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in seaice_growth.F and seaice_solve4temp.F |
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o pkg/seaice : |
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- simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula.EQ. |
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1 or 2, using newly added run time parameter SEAICE_availHeatTaper. |
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- fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148. |
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- add permanent SItflux diag that corresponds to TFLUX but includes |
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ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget. |
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- allow activation/testing of a fix for suspected missing term in |
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ocn-ice heat budget (to be confirmed). To test this, you want to |
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undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param |
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SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic. |
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- no change in results, fwd or ad. |
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o global_ocean.cs32x15/results: three changes following from the pkg/seaice commit below. |
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- switch to variable freezing point. |
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Results change : cg2d -> 1 digits; ad -> 3-6-6 digits. |
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- bug fix : the sublimation term that was missing is now activated. |
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Results change : cg2d -> 2 digits; ad -> 8-6-6 digits. |
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- bug fix : flooding sign term for SIsal0.NE.0. |
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Result change : cg2d -> 8 digits; ad -> 11-12-9 digits. |
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o pkg/seaice: |
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- unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT |
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is now the default, and the old default constant freezing point is recovered with |
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SEAICE_tempFrz0 = -1.96, |
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SEAICE_dTempFrz_dS = 0., |
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- retire SEAICE_freeze that was the old way of specifycing the constant freezing point. |
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- remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there. |
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- bug fix (thanks to M. Losch) : the sublimation term that was missing is now |
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activated. To reproduce old results that had this bug define SEAICE_DISABLE_SUBLIM. |
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- bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211) |
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was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail). |
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- bug fix (thanks to O. Jahn) : area loss for melting got messed up in |
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seaice_growth r149 for legacy branch (no results change). |
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- introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code from I. Fenty). |
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- results did not change except for global_ocean.cs32x15, mostly due to the switch |
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to variable freezing point (see above item for detail). |
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o pkg/thsice: |
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- fix and simplify interface to salt_plume pkg ; diagnose directly amount of |
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seawater freezing in thsice_calc_thickn (not used). |
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o pkg/seaice: turbulent flux term specification via run time params. |
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- replace CPP switches with run time switches to facilitate testing |
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- retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX, GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR |
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- added runtime parameter : SEAICEturbFluxFormula |
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- move Mcphee constants to SEAICE_PARAMS.h |
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- seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula; |
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SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply); remove |
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seaice_summary call (moved to seaice_init_fixed) |
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- seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on |
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SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms) |
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- seaice_summary.F : add missing report of read turbulent flux term set up (and SITRACER). |
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- seaice_check.F : check range; inform and stop if retired CPPs are used (incl. SEAICE_AGE). |
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- seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without |
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CPP switch, same computation as before for the different options. |
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- change results at the truncation level. |
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o pkg/seaice: |
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- remove un-used parameters LAD & MAX_TICE ; add new run-time parameters: |
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useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and |
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SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY. |
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- update verification/*/input*/data.seaice: |
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to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY |
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code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ; |
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and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code, |
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set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0. |
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o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY): |
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- remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same |
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algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0); |
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difference in results only due to machine truncation. |
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- remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using |
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MaykutPolySatVap; keep MIN_LWDOWN. |
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- adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation. |
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- update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87, |
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+ 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits). |
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o pkg/salt_plume: |
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- isolate saltPlumeFlux array exch into a specific S/R called from |
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do_oceanic_phys.F |
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- add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice. |
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o verification: |
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- move untested set-up to MITgcm_contrib/verification_other. |
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o pkg/seaice: |
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- retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER. |
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o pkg/seaice: |
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- seaice_solve4temp.F (keeping results unchanged): |
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* add 2 future run-time params to select which saturation vapor pressure |
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formula is used and how post-iteration fluxes are set. |
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Temporary set these 2 params according to option SOLVE4TEMP_LEGACY; |
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* New piece of code (not used) to update surf. atmos. heat flux F_ia using |
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the linearized expression to stay consistent with tsurf finding. |
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- seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x |
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can be < 0. |
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o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef): |
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- remove from F_ia (and from it's derivative dFiDTs1) the contribution of |
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conductive heat flux F_c , and add it explicitly when updating tsurf as |
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solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf |
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so that now F_ia has a consistent meaning through the entire routine. |
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This causes differences at truncation level: update output of fwd exp. |
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global_ocean.cs32x15.seaice. |
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o pkg/seaice: |
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- lots of editing/cleaning in seaice_solve4temp.F + better documentation |
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of arrays, sign/direction of fluxes; no effect on results. |
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- replace hard coded 273.16 (=previous value of celsius2K) by celsius2K |
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in seaice_budget_ocean.F & seaice_solve4temp.F (SOLVE4TEMP_LEGACY part); |
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note: this should have been done before changing celsius2K default. |
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- to keep results unchanged, add back old value of celsius2K in verification |
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exp. input*/data : lab_sea (AD), offline_exf_seaice (fwd+AD) & seaice_obcs |
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- replace hard coded seawater freezing temp in seaice_solve4temp.F (part |
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SOLVE4TEMP_LEGACY) of 271.20 (=previous value of celsius2K + default |
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value of SEAICE_freeze) by celsius2K+SEAICE_freeze so that seawater |
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freezing temp is consistent with value in seaice_growth.F ; this causes |
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differences at machine truncation level: update lab_sea AD output (3/4). |
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o pkg/seaice: |
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- mask (in exf_init_fixed.F) atemp,aqh,evap,precip,runoff,lwflx,areamask |
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and climsst/sss even when using seaice (to prevent calculation that might |
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use SST on land); does not affect any verification exp. |
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- apply mask to taux,tauy (in seaice_get_dynforcing.F); update output |
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of lab_sea.fd & lab_sea.hb87 and global_ocean.cs32x15.seaice_dynmix. |
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o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness |
o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness |
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over land (non-legacy code) |
over land (non-legacy code) |
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o vectorize salt_plume package: |
o vectorize salt_plume package: |
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- add extra code to salt_plume_frac and salt_plume_tendency_apply_s |
- add extra code to salt_plume_frac and salt_plume_tendency_apply_s |
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- this code computes plumebk everywhere (also over land), thus requires |
- this code computes plumebk everywhere (also over land), thus requires |
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code to avoid divisions by zero and catch the case of kLev=Nr. |
code to avoid divisions by zero and catch the case of kLev=Nr. |
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