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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_growth.F,v 1.40 2007/12/06 05:23:41 dimitri Exp $ |
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C $Name: $ |
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|
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#include "SEAICE_OPTIONS.h" |
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|
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CStartOfInterface |
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SUBROUTINE SEAICE_GROWTH( myTime, myIter, myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE seaice_growth | |
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C | o Updata ice thickness and snow depth | |
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C |==========================================================| |
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C \==========================================================/ |
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IMPLICIT NONE |
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|
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C === Global variables === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "DYNVARS.h" |
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#include "GRID.h" |
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#include "FFIELDS.h" |
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#include "SEAICE_PARAMS.h" |
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#include "SEAICE.h" |
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#ifdef ALLOW_EXF |
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# include "EXF_OPTIONS.h" |
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# include "EXF_FIELDS.h" |
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# include "EXF_PARAM.h" |
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#endif |
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#ifdef ALLOW_SALT_PLUME |
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# include "SALT_PLUME.h" |
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#endif |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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#endif |
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|
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C === Routine arguments === |
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C myTime - Simulation time |
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C myIter - Simulation timestep number |
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C myThid - Thread no. that called this routine. |
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_RL myTime |
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INTEGER myIter, myThid |
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CEndOfInterface |
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|
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C === Local variables === |
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C i,j,bi,bj - Loop counters |
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|
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INTEGER i, j, bi, bj |
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C number of surface interface layer |
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INTEGER kSurface |
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C constants |
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_RL TBC, SDF, ICE2SNOW |
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_RL QI, recip_QI, QS, recip_QS |
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C auxillary variables |
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_RL availHeat, hEffOld, snowEnergy |
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_RL growthHEFF, growthNeg |
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#ifdef ALLOW_SEAICE_FLOODING |
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_RL hDraft |
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#endif /* ALLOW_SEAICE_FLOODING */ |
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_RL GAREA (1:sNx,1:sNy) |
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_RL GHEFF (1:sNx,1:sNy) |
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C RESID_HEAT is residual heat above freezing in equivalent m of ice |
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_RL RESID_HEAT (1:sNx,1:sNy) |
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#ifdef SEAICE_SALINITY |
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_RL saltFluxAdjust(1:sNx,1:sNy) |
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#endif |
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|
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C FICE - thermodynamic ice growth rate over sea ice in W/m^2 |
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C >0 causes ice growth, <0 causes snow and sea ice melt |
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C FHEFF - effective thermodynamic ice growth rate over sea ice in W/m^2 |
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C >0 causes ice growth, <0 causes snow and sea ice melt |
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C QNETO - thermodynamic ice growth rate over open water in W/m^2 |
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C ( = surface heat flux ) |
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C >0 causes ice growth, <0 causes snow and sea ice melt |
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C QNETI - net surface heat flux under ice in W/m^2 |
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C QSWO - short wave heat flux over ocean in W/m^2 |
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C QSWI - short wave heat flux under ice in W/m^2 |
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_RL FHEFF (1:sNx,1:sNy) |
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_RL FICE (1:sNx,1:sNy) |
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_RL QNETO (1:sNx,1:sNy) |
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_RL QNETI (1:sNx,1:sNy) |
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_RL QSWO (1:sNx,1:sNy) |
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_RL QSWI (1:sNx,1:sNy) |
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C |
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_RL HCORR (1:sNx,1:sNy) |
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C saltWtrIce contains m of salty ice melted (<0) or created (>0) |
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_RL saltWtrIce (1:sNx,1:sNy) |
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C frWtrIce contains m of freshwater ice melted (<0) or created (>0) |
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C that is, ice due to precipitation or snow |
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_RL frWtrIce (1:sNx,1:sNy) |
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C frWtrAtm contains freshwater flux from the atmosphere |
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_RL frWtrAtm (1:sNx,1:sNy) |
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C actual ice thickness with upper and lower limit |
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_RL HICE (1:sNx,1:sNy) |
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C actual snow thickness |
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_RL hSnwLoc (1:sNx,1:sNy) |
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C wind speed |
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_RL UG (1:sNx,1:sNy) |
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_RL SPEED_SQ |
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C local copy of AREA |
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_RL areaLoc |
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|
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#ifdef SEAICE_MULTICATEGORY |
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INTEGER it |
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INTEGER ilockey |
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_RL RK |
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_RL HICEP (1:sNx,1:sNy) |
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_RL FICEP (1:sNx,1:sNy) |
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_RL QSWIP (1:sNx,1:sNy) |
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#endif |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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LOGICAL DIAGNOSTICS_IS_ON |
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EXTERNAL DIAGNOSTICS_IS_ON |
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#endif |
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|
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if ( buoyancyRelation .eq. 'OCEANICP' ) then |
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kSurface = Nr |
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else |
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kSurface = 1 |
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endif |
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|
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C FREEZING TEMP. OF SEA WATER (deg C) |
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TBC = SEAICE_freeze |
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C RATIO OF WATER DESITY TO SNOW DENSITY |
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SDF = 1000.0 _d 0/330.0 _d 0 |
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C RATIO OF SEA ICE DENSITY to SNOW DENSITY |
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ICE2SNOW = SDF * ICE2WATR |
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C HEAT OF FUSION OF ICE (m^3/J) |
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QI = 302.0 _d +06 |
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recip_QI = 1.0 _d 0 / QI |
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C HEAT OF FUSION OF SNOW (J/m^3) |
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QS = 1.1 _d +08 |
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recip_QS = 1.1 _d 0 / QS |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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c |
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#ifdef ALLOW_AUTODIFF_TAMC |
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act1 = bi - myBxLo(myThid) |
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max1 = myBxHi(myThid) - myBxLo(myThid) + 1 |
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act2 = bj - myByLo(myThid) |
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max2 = myByHi(myThid) - myByLo(myThid) + 1 |
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act3 = myThid - 1 |
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max3 = nTx*nTy |
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act4 = ikey_dynamics - 1 |
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iicekey = (act1 + 1) + act2*max1 |
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& + act3*max1*max2 |
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& + act4*max1*max2*max3 |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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C |
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C initialise a few fields |
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C |
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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CADJ STORE qnet(:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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CADJ STORE qsw(:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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DO J=1,sNy |
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DO I=1,sNx |
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FHEFF(I,J) = 0.0 _d 0 |
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FICE (I,J) = 0.0 _d 0 |
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QNETO(I,J) = 0.0 _d 0 |
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QNETI(I,J) = 0.0 _d 0 |
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QSWO (I,J) = 0.0 _d 0 |
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QSWI (I,J) = 0.0 _d 0 |
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HCORR(I,J) = 0.0 _d 0 |
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saltWtrIce(I,J) = 0.0 _d 0 |
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frWtrIce(I,J) = 0.0 _d 0 |
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frWtrAtm(I,J) = 0.0 _d 0 |
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RESID_HEAT(I,J) = 0.0 _d 0 |
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#ifdef SEAICE_SALINITY |
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saltFluxAdjust(I,J) = 0.0 _d 0 |
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#endif |
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#ifdef SEAICE_MULTICATEGORY |
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FICEP(I,J) = 0.0 _d 0 |
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QSWIP(I,J) = 0.0 _d 0 |
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#endif |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE heff(:,:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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CADJ STORE hsnow(:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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DO J=1,sNy |
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DO I=1,sNx |
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C COMPUTE ACTUAL ICE THICKNESS AND PUT MINIMUM/MAXIMUM |
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C ON ICE THICKNESS FOR BUDGET COMPUTATION |
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C The default of A22 = 0.15 is a common threshold for defining |
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C the ice edge. This ice concentration usually does not occur |
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C due to thermodynamics but due to advection. |
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areaLoc = MAX(A22,AREA(I,J,2,bi,bj)) |
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HICE(I,J) = HEFF(I,J,2,bi,bj)/areaLoc |
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C Do we know what this is for? |
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HICE(I,J) = MAX(HICE(I,J),0.05 _d +00) |
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C Capping the actual ice thickness effectively enforces a |
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C minimum of heat flux through the ice and helps getting rid of |
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C very thick ice. |
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cdm actually, this does exactly the opposite, i.e., ice is thicker |
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cdm when HICE is capped, so I am commenting out |
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cdm HICE(I,J) = MIN(HICE(I,J),9.0 _d +00) |
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hSnwLoc(I,J) = HSNOW(I,J,bi,bj)/areaLoc |
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ENDDO |
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ENDDO |
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|
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C NOW DETERMINE MIXED LAYER TEMPERATURE |
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DO J=1,sNy |
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DO I=1,sNx |
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TMIX(I,J,bi,bj)=theta(I,J,kSurface,bi,bj)+273.16 _d +00 |
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#ifdef SEAICE_DEBUG |
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TMIX(I,J,bi,bj)=MAX(TMIX(I,J,bi,bj),271.2 _d +00) |
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#endif |
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ENDDO |
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ENDDO |
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|
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C THERMAL WIND OF ATMOSPHERE |
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DO J=1,sNy |
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DO I=1,sNx |
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CMLC this seems to be more natural as we do compute the wind speed in |
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CMLC pkg/exf/exf_wind.F, but it changes the results |
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CML UG(I,J) = MAX(SEAICE_EPS,wspeed(I,J,bi,bj)) |
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SPEED_SQ = UWIND(I,J,bi,bj)**2 + VWIND(I,J,bi,bj)**2 |
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IF ( SPEED_SQ .LE. SEAICE_EPS_SQ ) THEN |
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UG(I,J)=SEAICE_EPS |
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ELSE |
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UG(I,J)=SQRT(SPEED_SQ) |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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cphCADJ STORE heff = comlev1, key = ikey_dynamics |
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cphCADJ STORE hsnow = comlev1, key = ikey_dynamics |
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cphCADJ STORE uwind = comlev1, key = ikey_dynamics |
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cphCADJ STORE vwind = comlev1, key = ikey_dynamics |
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c |
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CADJ STORE tice = comlev1, key = ikey_dynamics |
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# ifdef SEAICE_MULTICATEGORY |
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CADJ STORE tices = comlev1, key = ikey_dynamics |
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# endif |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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|
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C NOW DETERMINE GROWTH RATES |
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C FIRST DO OPEN WATER |
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CALL SEAICE_BUDGET_OCEAN( |
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I UG, |
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U TMIX, |
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O QNETO, QSWO, |
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I bi, bj, myThid ) |
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|
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C NOW DO ICE |
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IF (useRelativeWind) THEN |
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C Compute relative wind speed over sea ice. |
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DO J=1,sNy |
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DO I=1,sNx |
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SPEED_SQ = |
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& (uWind(I,J,bi,bj) |
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& +0.5 _d 0*(uVel(i,j,1,bi,bj)+uVel(i+1,j,1,bi,bj)) |
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& -0.5 _d 0*(uice(i,j,1,bi,bj)+uice(i+1,j,1,bi,bj)))**2 |
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& +(vWind(I,J,bi,bj) |
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& +0.5 _d 0*(vVel(i,j,1,bi,bj)+vVel(i,j+1,1,bi,bj)) |
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& -0.5 _d 0*(vice(i,j,1,bi,bj)+vice(i,j+1,1,bi,bj)))**2 |
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IF ( SPEED_SQ .LE. SEAICE_EPS_SQ ) THEN |
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UG(I,J)=SEAICE_EPS |
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ELSE |
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UG(I,J)=SQRT(SPEED_SQ) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDIF |
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#ifdef SEAICE_MULTICATEGORY |
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C-- Start loop over muli-categories |
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DO IT=1,MULTDIM |
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#ifdef ALLOW_AUTODIFF_TAMC |
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ilockey = (iicekey-1)*MULTDIM + IT |
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CADJ STORE tices(:,:,it,bi,bj) = comlev1_multdim, |
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CADJ & key = ilockey, byte = isbyte |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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RK=REAL(IT) |
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DO J=1,sNy |
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DO I=1,sNx |
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HICEP(I,J)=(HICE(I,J)/MULTDIM)*((2.0 _d 0*RK)-1.0 _d 0) |
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TICE(I,J,bi,bj)=TICES(I,J,IT,bi,bj) |
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ENDDO |
290 |
ENDDO |
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CALL SEAICE_BUDGET_ICE( |
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I UG, HICEP, hSnwLoc, |
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U TICE, |
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O FICEP, QSWIP, |
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I bi, bj, myThid ) |
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DO J=1,sNy |
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DO I=1,sNx |
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C average surface heat fluxes/growth rates |
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FICE (I,J) = FICE(I,J) + FICEP(I,J)/MULTDIM |
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QSWI (I,J) = QSWI(I,J) + QSWIP(I,J)/MULTDIM |
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TICES(I,J,IT,bi,bj) = TICE(I,J,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C-- End loop over multi-categories |
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#else /* SEAICE_MULTICATEGORY */ |
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CALL SEAICE_BUDGET_ICE( |
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I UG, HICE, hSnwLoc, |
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U TICE, |
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O FICE, QSWI, |
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I bi, bj, myThid ) |
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#endif /* SEAICE_MULTICATEGORY */ |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
315 |
CADJ STORE theta(:,:,:,bi,bj)= comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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CADJ STORE heff(:,:,:,bi,bj) = comlev1_bibj, |
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CADJ & key = iicekey, byte = isbyte |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
320 |
C |
321 |
C-- compute and apply ice growth due to oceanic heat flux from below |
322 |
C |
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DO J=1,sNy |
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DO I=1,sNx |
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C-- Create or melt sea-ice so that first-level oceanic temperature |
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C is approximately at the freezing point when there is sea-ice. |
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C Initially the units of YNEG/availHeat are m of sea-ice. |
328 |
C The factor dRf(1)/72.0764, used to convert temperature |
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C change in deg K to m of sea-ice, is approximately: |
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C dRf(1) * (sea water heat capacity = 3996 J/kg/K) |
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C * (density of sea-water = 1026 kg/m^3) |
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C / (latent heat of fusion of sea-ice = 334000 J/kg) |
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C / (density of sea-ice = 910 kg/m^3) |
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C Negative YNEG/availHeat leads to ice growth. |
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C Positive YNEG/availHeat leads to ice melting. |
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IF ( .NOT. inAdMode ) THEN |
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#ifdef SEAICE_VARIABLE_FREEZING_POINT |
338 |
TBC = -0.0575 _d 0*salt(I,J,kSurface,bi,bj) + 0.0901 _d 0 |
339 |
#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
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#ifdef SEAICE_BREAKS_VERIFICATION |
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C To first order, the "thickness" of ice that melts during a given |
342 |
C period of time due to an excess or to a deficit of heat in the |
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C mixed layer should be the same irrespective of sea ice concentration. |
344 |
C This change breaks the pkg/seaice verification experiments. |
345 |
availHeat = SEAICE_availHeatFrac * AREA(I,J,2,bi,bj) |
346 |
& * (theta(I,J,kSurface,bi,bj)-TBC) * dRf(kSurface) |
347 |
& * hFacC(i,j,kSurface,bi,bj) / 72.0764 _d 0 |
348 |
#else |
349 |
availHeat = SEAICE_availHeatFrac |
350 |
& * (theta(I,J,kSurface,bi,bj)-TBC) * dRf(kSurface) |
351 |
& * hFacC(i,j,kSurface,bi,bj) / 72.0764 _d 0 |
352 |
#endif SEAICE_BREAKS_VERIFICATION |
353 |
ELSE |
354 |
availHeat = 0. |
355 |
ENDIF |
356 |
C local copy of old effective ice thickness |
357 |
hEffOld = HEFF(I,J,1,bi,bj) |
358 |
C Melt (availHeat>0) or create (availHeat<0) sea ice |
359 |
HEFF(I,J,1,bi,bj) = MAX(ZERO,HEFF(I,J,1,bi,bj)-availHeat) |
360 |
C |
361 |
YNEG(I,J,bi,bj) = hEffOld - HEFF(I,J,1,bi,bj) |
362 |
C |
363 |
saltWtrIce(I,J) = saltWtrIce(I,J) - YNEG(I,J,bi,bj) |
364 |
RESID_HEAT(I,J) = availHeat - YNEG(I,J,bi,bj) |
365 |
C YNEG now contains m of ice melted (>0) or created (<0) |
366 |
C saltWtrIce contains m of ice melted (<0) or created (>0) |
367 |
C RESID_HEAT is residual heat above freezing in equivalent m of ice |
368 |
ENDDO |
369 |
ENDDO |
370 |
|
371 |
cph( |
372 |
#ifdef ALLOW_AUTODIFF_TAMC |
373 |
cphCADJ STORE heff = comlev1, key = ikey_dynamics |
374 |
cphCADJ STORE hsnow = comlev1, key = ikey_dynamics |
375 |
#endif |
376 |
cph) |
377 |
c |
378 |
#ifdef ALLOW_AUTODIFF_TAMC |
379 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
380 |
CADJ & key = iicekey, byte = isbyte |
381 |
CADJ STORE hsnow(:,:,bi,bj) = comlev1_bibj, |
382 |
CADJ & key = iicekey, byte = isbyte |
383 |
CADJ STORE fice(:,:) = comlev1_bibj, |
384 |
CADJ & key = iicekey, byte = isbyte |
385 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
386 |
cph) |
387 |
C |
388 |
C-- compute and apply ice growth due to atmospheric fluxes from above |
389 |
C |
390 |
DO J=1,sNy |
391 |
DO I=1,sNx |
392 |
C NOW CALCULATE CORRECTED effective growth in J/m^2 (>0=melt) |
393 |
GHEFF(I,J)=-SEAICE_deltaTtherm*FICE(I,J)*AREA(I,J,2,bi,bj) |
394 |
ENDDO |
395 |
ENDDO |
396 |
|
397 |
#ifdef ALLOW_AUTODIFF_TAMC |
398 |
CADJ STORE fice(:,:) = comlev1_bibj, |
399 |
CADJ & key = iicekey, byte = isbyte |
400 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
401 |
|
402 |
DO J=1,sNy |
403 |
DO I=1,sNx |
404 |
IF(FICE(I,J).LT.ZERO.AND.AREA(I,J,2,bi,bj).GT.ZERO) THEN |
405 |
C use FICE to melt snow and CALCULATE CORRECTED GROWTH |
406 |
C effective snow thickness in J/m^2 |
407 |
snowEnergy=HSNOW(I,J,bi,bj)*QS |
408 |
IF(GHEFF(I,J).LE.snowEnergy) THEN |
409 |
C not enough heat to melt all snow; use up all heat flux FICE |
410 |
HSNOW(I,J,bi,bj)=HSNOW(I,J,bi,bj)-GHEFF(I,J)/QS |
411 |
C SNOW CONVERTED INTO WATER AND THEN INTO equivalent m of ICE melt |
412 |
C The factor 1/ICE2SNOW converts m of snow to m of sea-ice |
413 |
frWtrIce(I,J) = frWtrIce(I,J) - GHEFF(I,J)/(QS*ICE2SNOW) |
414 |
FICE (I,J) = ZERO |
415 |
ELSE |
416 |
C enought heat to melt snow completely; |
417 |
C compute remaining heat flux that will melt ice |
418 |
FICE(I,J)=-(GHEFF(I,J)-snowEnergy)/ |
419 |
& SEAICE_deltaTtherm/AREA(I,J,2,bi,bj) |
420 |
C convert all snow to melt water (fresh water flux) |
421 |
frWtrIce(I,J) = frWtrIce(I,J) |
422 |
& -HSNOW(I,J,bi,bj)/ICE2SNOW |
423 |
HSNOW(I,J,bi,bj)=0.0 _d 0 |
424 |
END IF |
425 |
END IF |
426 |
ENDDO |
427 |
ENDDO |
428 |
|
429 |
#ifdef ALLOW_AUTODIFF_TAMC |
430 |
CADJ STORE fice(:,:) = comlev1_bibj, |
431 |
CADJ & key = iicekey, byte = isbyte |
432 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
433 |
|
434 |
DO J=1,sNy |
435 |
DO I=1,sNx |
436 |
C now get cell averaged growth rate in W/m^2, >0 causes ice growth |
437 |
FHEFF(I,J)= FICE(I,J) * AREA(I,J,2,bi,bj) |
438 |
& + QNETO(I,J) * (ONE-AREA(I,J,2,bi,bj)) |
439 |
ENDDO |
440 |
ENDDO |
441 |
cph( |
442 |
#ifdef ALLOW_AUTODIFF_TAMC |
443 |
CADJ STORE heff(:,:,:,bi,bj) = comlev1_bibj, |
444 |
CADJ & key = iicekey, byte = isbyte |
445 |
CADJ STORE fice(:,:) = comlev1_bibj, |
446 |
CADJ & key = iicekey, byte = isbyte |
447 |
CADJ STORE fheff(:,:) = comlev1_bibj, |
448 |
CADJ & key = iicekey, byte = isbyte |
449 |
CADJ STORE qneto(:,:) = comlev1_bibj, |
450 |
CADJ & key = iicekey, byte = isbyte |
451 |
CADJ STORE qswi(:,:) = comlev1_bibj, |
452 |
CADJ & key = iicekey, byte = isbyte |
453 |
CADJ STORE qswo(:,:) = comlev1_bibj, |
454 |
CADJ & key = iicekey, byte = isbyte |
455 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
456 |
cph) |
457 |
C |
458 |
C First update (freeze or melt) ice area |
459 |
C |
460 |
DO J=1,sNy |
461 |
DO I=1,sNx |
462 |
C negative growth in meters of ice (>0 for melting) |
463 |
growthNeg = -SEAICE_deltaTtherm*FHEFF(I,J)*recip_QI |
464 |
C negative growth must not exceed effective ice thickness (=volume) |
465 |
C (that is, cannot melt more than all the ice) |
466 |
growthHEFF = -ONE*MIN(HEFF(I,J,1,bi,bj),growthNeg) |
467 |
C growthHEFF < 0 means melting |
468 |
HCORR(I,J) = MIN(ZERO,growthHEFF) |
469 |
C gain of new effective ice thickness over open water (>0 by definition) |
470 |
GAREA(I,J) = MAX(ZERO,SEAICE_deltaTtherm*QNETO(I,J)*recip_QI) |
471 |
CML removed these loops and moved TAMC store directive up |
472 |
CML ENDDO |
473 |
CML ENDDO |
474 |
CML#ifdef ALLOW_AUTODIFF_TAMC |
475 |
CMLCADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
476 |
CMLCADJ & key = iicekey, byte = isbyte |
477 |
CML#endif |
478 |
CML DO J=1,sNy |
479 |
CML DO I=1,sNx |
480 |
C Here we finally compute the new AREA |
481 |
AREA(I,J,1,bi,bj)=AREA(I,J,1,bi,bj)+ |
482 |
& (ONE-AREA(I,J,2,bi,bj))*GAREA(I,J)/HO |
483 |
& +HALF*HCORR(I,J)*AREA(I,J,2,bi,bj) |
484 |
& /(HEFF(I,J,1,bi,bj)+.00001 _d 0) |
485 |
ENDDO |
486 |
ENDDO |
487 |
#ifdef ALLOW_AUTODIFF_TAMC |
488 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
489 |
CADJ & key = iicekey, byte = isbyte |
490 |
#endif |
491 |
C |
492 |
C now update (freeze or melt) HEFF |
493 |
C |
494 |
DO J=1,sNy |
495 |
DO I=1,sNx |
496 |
C negative growth (>0 for melting) of existing ice in meters |
497 |
growthNeg = -SEAICE_deltaTtherm* |
498 |
& FICE(I,J)*recip_QI*AREA(I,J,2,bi,bj) |
499 |
C negative growth must not exceed effective ice thickness (=volume) |
500 |
C (that is, cannot melt more than all the ice) |
501 |
growthHEFF = -ONE*MIN(HEFF(I,J,1,bi,bj),growthNeg) |
502 |
C growthHEFF < 0 means melting |
503 |
HEFF(I,J,1,bi,bj)= HEFF(I,J,1,bi,bj) + growthHEFF |
504 |
C add effective growth to fresh water of ice |
505 |
saltWtrIce(I,J) = saltWtrIce(I,J) + growthHEFF |
506 |
|
507 |
C now calculate QNETI under ice (if any) as the difference between |
508 |
C the available "heat flux" growthNeg and the actual growthHEFF; |
509 |
C keep in mind that growthNeg and growthHEFF have different signs |
510 |
C by construction |
511 |
QNETI(I,J) = (growthHEFF + growthNeg)*QI/SEAICE_deltaTtherm |
512 |
|
513 |
C now update other things |
514 |
|
515 |
#ifdef ALLOW_ATM_TEMP |
516 |
IF(FICE(I,J).GT.ZERO) THEN |
517 |
C freezing, add precip as snow |
518 |
HSNOW(I,J,bi,bj) = HSNOW(I,J,bi,bj)+SEAICE_deltaTtherm* |
519 |
& PRECIP(I,J,bi,bj)*AREA(I,J,2,bi,bj)*SDF |
520 |
ELSE |
521 |
C add precip as rain, water converted into equivalent m of |
522 |
C ice by 1/ICE2WATR. |
523 |
C Do not get confused by the sign: |
524 |
C precip > 0 for downward flux of fresh water |
525 |
C frWtrIce > 0 for more ice (corresponds to an upward "fresh water flux"), |
526 |
C so that here the rain is added *as if* it is melted ice (which is not |
527 |
C true, but just a trick; physically the rain just runs as water |
528 |
C through the ice into the ocean) |
529 |
frWtrIce(I,J) = frWtrIce(I,J) |
530 |
& -PRECIP(I,J,bi,bj)*AREA(I,J,2,bi,bj)* |
531 |
& SEAICE_deltaTtherm/ICE2WATR |
532 |
ENDIF |
533 |
#else /* ALLOW_ATM_TEMP */ |
534 |
STOP 'ABNORMAL END: S/R THSICE_GROWTH: ATM_TEMP undef' |
535 |
#endif /* ALLOW_ATM_TEMP */ |
536 |
|
537 |
ENDDO |
538 |
ENDDO |
539 |
|
540 |
#ifdef ALLOW_AUTODIFF_TAMC |
541 |
CADJ STORE hsnow(:,:,bi,bj) = comlev1_bibj, |
542 |
CADJ & key = iicekey, byte = isbyte |
543 |
#endif |
544 |
|
545 |
cph( very sensitive bit here by JZ |
546 |
#ifndef SEAICE_EXCLUDE_FOR_EXACT_AD_TESTING |
547 |
DO J=1,sNy |
548 |
DO I=1,sNx |
549 |
C Now melt snow if there is residual heat left in surface level |
550 |
C Note that units of YNEG and frWtrIce are m of ice |
551 |
IF( RESID_HEAT(I,J) .GT. ZERO .AND. |
552 |
& HSNOW(I,J,bi,bj) .GT. ZERO ) THEN |
553 |
GHEFF(I,J) = MIN( HSNOW(I,J,bi,bj)/SDF/ICE2WATR, |
554 |
& RESID_HEAT(I,J) ) |
555 |
YNEG(I,J,bi,bj) = YNEG(I,J,bi,bj) +GHEFF(I,J) |
556 |
ENDIF |
557 |
ENDDO |
558 |
ENDDO |
559 |
|
560 |
#ifdef ALLOW_AUTODIFF_TAMC |
561 |
CADJ STORE hsnow(:,:,bi,bj) = comlev1_bibj, |
562 |
CADJ & key = iicekey, byte = isbyte |
563 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
564 |
CADJ & key = iicekey, byte = isbyte |
565 |
#endif |
566 |
DO J=1,sNy |
567 |
DO I=1,sNx |
568 |
IF( RESID_HEAT(I,J) .GT. ZERO .AND. |
569 |
& HSNOW(I,J,bi,bj) .GT. ZERO ) THEN |
570 |
HSNOW(I,J,bi,bj) = HSNOW(I,J,bi,bj)-GHEFF(I,J)*SDF*ICE2WATR |
571 |
frWtrIce(I,J) = frWtrIce(I,J) -GHEFF(I,J) |
572 |
ENDIF |
573 |
ENDDO |
574 |
ENDDO |
575 |
#endif |
576 |
cph) |
577 |
|
578 |
#ifdef ALLOW_AUTODIFF_TAMC |
579 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
580 |
CADJ & key = iicekey, byte = isbyte |
581 |
# ifdef SEAICE_SALINITY |
582 |
CADJ STORE hsalt(:,:,bi,bj) = comlev1_bibj, |
583 |
CADJ & key = iicekey, byte = isbyte |
584 |
# endif /* SEAICE_SALINITY */ |
585 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
586 |
|
587 |
DO J=1,sNy |
588 |
DO I=1,sNx |
589 |
|
590 |
#ifdef ALLOW_ATM_TEMP |
591 |
|
592 |
C NOW GET FRESH WATER FLUX |
593 |
EmPmR(I,J,bi,bj) = maskC(I,J,kSurface,bi,bj)*( |
594 |
& ( EVAP(I,J,bi,bj)-PRECIP(I,J,bi,bj) ) |
595 |
& * ( ONE - AREA(I,J,2,bi,bj) ) |
596 |
#ifdef ALLOW_RUNOFF |
597 |
& - RUNOFF(I,J,bi,bj) |
598 |
#endif /* ALLOW_RUNOFF */ |
599 |
& + frWtrIce(I,J)*ICE2WATR/SEAICE_deltaTtherm |
600 |
& + saltWtrIce(I,J)*ICE2WATR/SEAICE_deltaTtherm |
601 |
& )*rhoConstFresh |
602 |
#ifdef ALLOW_DIAGNOSTICS |
603 |
frWtrAtm(I,J) = maskC(I,J,kSurface,bi,bj)*( |
604 |
& PRECIP(I,J,bi,bj) |
605 |
& - EVAP(I,J,bi,bj) |
606 |
& *( ONE - AREA(I,J,2,bi,bj) ) |
607 |
& + RUNOFF(I,J,bi,bj) |
608 |
& ) |
609 |
#endif /* ALLOW_DIAGNOSTICS */ |
610 |
|
611 |
C COMPUTE SURFACE SALT FLUX AND ADJUST ICE SALINITY |
612 |
#ifdef SEAICE_SALINITY |
613 |
C set HSALT = 0 if HSALT < 0 and compute salt to remove from ocean |
614 |
IF ( HSALT(I,J,bi,bj) .LT. 0.0 ) THEN |
615 |
saltFluxAdjust(I,J) = - HEFFM(I,J,bi,bj) * |
616 |
& HSALT(I,J,bi,bj) / SEAICE_deltaTtherm |
617 |
HSALT(I,J,bi,bj) = 0.0 _d 0 |
618 |
ENDIF |
619 |
|
620 |
ENDDO |
621 |
ENDDO |
622 |
|
623 |
#ifdef ALLOW_AUTODIFF_TAMC |
624 |
CADJ STORE hsalt(:,:,bi,bj) = comlev1_bibj, |
625 |
CADJ & key = iicekey, byte = isbyte |
626 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
627 |
|
628 |
DO J=1,sNy |
629 |
DO I=1,sNx |
630 |
|
631 |
C saltWtrIce > 0 : m of sea ice that is created |
632 |
IF ( saltWtrIce(I,J) .GE. 0.0 ) THEN |
633 |
saltFlux(I,J,bi,bj) = HEFFM(I,J,bi,bj)*saltWtrIce(I,J)* |
634 |
& ICE2WATR*rhoConstFresh*SEAICE_salinity* |
635 |
& salt(I,j,kSurface,bi,bj)/SEAICE_deltaTtherm |
636 |
#ifdef ALLOW_SALT_PLUME |
637 |
C saltPlumeFlux is defined only during freezing: |
638 |
saltPlumeFlux(I,J,bi,bj)=HEFFM(I,J,bi,bj)*saltWtrIce(I,J)* |
639 |
& ICE2WATR*rhoConstFresh*(1-SEAICE_salinity)* |
640 |
& salt(I,j,kSurface,bi,bj)/SEAICE_deltaTtherm |
641 |
#endif /* ALLOW_SALT_PLUME */ |
642 |
C saltWtrIce < 0 : m of sea ice that is melted |
643 |
ELSE |
644 |
saltFlux(I,J,bi,bj) = HEFFM(I,J,bi,bj)*saltWtrIce(I,J)* |
645 |
& HSALT(I,J,bi,bj)/(HEFF(I,J,1,bi,bj)-saltWtrIce(I,J))/ |
646 |
& SEAICE_deltaTtherm |
647 |
#ifdef ALLOW_SALT_PLUME |
648 |
saltPlumeFlux(i,j,bi,bj) = 0.0 _d 0 |
649 |
#endif /* ALLOW_SALT_PLUME */ |
650 |
ENDIF |
651 |
C update HSALT based on surface saltFlux |
652 |
HSALT(I,J,bi,bj) = HSALT(I,J,bi,bj) + |
653 |
& saltFlux(I,J,bi,bj) * SEAICE_deltaTtherm |
654 |
saltFlux(I,J,bi,bj) = |
655 |
& saltFlux(I,J,bi,bj) + saltFluxAdjust(I,J) |
656 |
C set HSALT = 0 if HEFF = 0 and compute salt to dump into ocean |
657 |
IF ( HEFF(I,J,1,bi,bj) .EQ. 0.0 ) THEN |
658 |
saltFlux(I,J,bi,bj) = saltFlux(I,J,bi,bj) - |
659 |
& HEFFM(I,J,bi,bj) * HSALT(I,J,bi,bj) / |
660 |
& SEAICE_deltaTtherm |
661 |
HSALT(I,J,bi,bj) = 0.0 _d 0 |
662 |
#ifdef ALLOW_SALT_PLUME |
663 |
saltPlumeFlux(i,j,bi,bj) = 0.0 _d 0 |
664 |
#endif /* ALLOW_SALT_PLUME */ |
665 |
ENDIF |
666 |
#endif /* SEAICE_SALINITY */ |
667 |
|
668 |
#else /* ALLOW_ATM_TEMP */ |
669 |
STOP 'ABNORMAL END: S/R THSICE_GROWTH: ATM_TEMP undef' |
670 |
#endif /* ALLOW_ATM_TEMP */ |
671 |
|
672 |
C NOW GET TOTAL QNET AND QSW |
673 |
QNET(I,J,bi,bj) = QNETI(I,J) * AREA(I,J,2,bi,bj) |
674 |
& +QNETO(I,J) * (ONE-AREA(I,J,2,bi,bj)) |
675 |
QSW(I,J,bi,bj) = QSWI(I,J) * AREA(I,J,2,bi,bj) |
676 |
& +QSWO(I,J) * (ONE-AREA(I,J,2,bi,bj)) |
677 |
|
678 |
ENDDO |
679 |
ENDDO |
680 |
|
681 |
#ifdef ALLOW_AUTODIFF_TAMC |
682 |
CADJ STORE yneg(:,:,bi,bj) = comlev1_bibj, |
683 |
CADJ & key = iicekey, byte = isbyte |
684 |
#endif |
685 |
DO J=1,sNy |
686 |
DO I=1,sNx |
687 |
C Now convert YNEG back to deg K. |
688 |
YNEG(I,J,bi,bj) = YNEG(I,J,bi,bj)*recip_dRf(kSurface) * |
689 |
& recip_hFacC(i,j,kSurface,bi,bj)*72.0764 _d 0 |
690 |
ENDDO |
691 |
ENDDO |
692 |
|
693 |
#ifdef ALLOW_AUTODIFF_TAMC |
694 |
CADJ STORE yneg(:,:,bi,bj) = comlev1_bibj, |
695 |
CADJ & key = iicekey, byte = isbyte |
696 |
#endif |
697 |
DO J=1,sNy |
698 |
DO I=1,sNx |
699 |
C Add YNEG contribution to QNET |
700 |
QNET(I,J,bi,bj) = QNET(I,J,bi,bj) |
701 |
& +YNEG(I,J,bi,bj)/SEAICE_deltaTtherm |
702 |
& *maskC(I,J,kSurface,bi,bj) |
703 |
& *HeatCapacity_Cp*rUnit2mass |
704 |
& *drF(kSurface)*hFacC(i,j,kSurface,bi,bj) |
705 |
ENDDO |
706 |
ENDDO |
707 |
|
708 |
#ifdef ALLOW_DIAGNOSTICS |
709 |
IF ( useDiagnostics ) THEN |
710 |
CALL DIAGNOSTICS_FILL(frWtrAtm,'SIatmFW ',0,1 ,2,bi,bj,myThid) |
711 |
ENDIF |
712 |
#endif /* ALLOW_DIAGNOSTICS */ |
713 |
|
714 |
#ifdef SEAICE_DEBUG |
715 |
CALL PLOT_FIELD_XYRS( GWATX,'Current GWATX ', myIter, myThid ) |
716 |
CALL PLOT_FIELD_XYRS( GWATY,'Current GWATY ', myIter, myThid ) |
717 |
CALL PLOT_FIELD_XYRL( QSW,'Current QSW ', myIter, myThid ) |
718 |
CALL PLOT_FIELD_XYRL( QNET,'Current QNET ', myIter, myThid ) |
719 |
CALL PLOT_FIELD_XYRL( EmPmR,'Current EmPmR ', myIter, myThid ) |
720 |
#endif /* SEAICE_DEBUG */ |
721 |
|
722 |
crg Added by Ralf Giering: do we need DO_WE_NEED_THIS ? |
723 |
#define DO_WE_NEED_THIS |
724 |
C NOW ZERO OUTSIDE POINTS |
725 |
#ifdef ALLOW_AUTODIFF_TAMC |
726 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
727 |
CADJ & key = iicekey, byte = isbyte |
728 |
CADJ STORE heff(:,:,:,bi,bj) = comlev1_bibj, |
729 |
CADJ & key = iicekey, byte = isbyte |
730 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
731 |
DO J=1,sNy |
732 |
DO I=1,sNx |
733 |
C NOW SET AREA(I,J,1,bi,bj)=0 WHERE NO ICE IS |
734 |
AREA(I,J,1,bi,bj)=MIN(AREA(I,J,1,bi,bj) |
735 |
& ,HEFF(I,J,1,bi,bj)/.0001 _d 0) |
736 |
ENDDO |
737 |
ENDDO |
738 |
#ifdef ALLOW_AUTODIFF_TAMC |
739 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
740 |
CADJ & key = iicekey, byte = isbyte |
741 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
742 |
DO J=1,sNy |
743 |
DO I=1,sNx |
744 |
C NOW TRUNCATE AREA |
745 |
#ifdef DO_WE_NEED_THIS |
746 |
AREA(I,J,1,bi,bj)=MIN(ONE,AREA(I,J,1,bi,bj)) |
747 |
ENDDO |
748 |
ENDDO |
749 |
#ifdef ALLOW_AUTODIFF_TAMC |
750 |
CADJ STORE area(:,:,:,bi,bj) = comlev1_bibj, |
751 |
CADJ & key = iicekey, byte = isbyte |
752 |
CADJ STORE hsnow(:,:,bi,bj) = comlev1_bibj, |
753 |
CADJ & key = iicekey, byte = isbyte |
754 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
755 |
DO J=1,sNy |
756 |
DO I=1,sNx |
757 |
AREA(I,J,1,bi,bj) = MAX(ZERO,AREA(I,J,1,bi,bj)) |
758 |
HSNOW(I,J,bi,bj) = MAX(ZERO,HSNOW(I,J,bi,bj)) |
759 |
#endif /* DO_WE_NEED_THIS */ |
760 |
AREA(I,J,1,bi,bj) = AREA(I,J,1,bi,bj)*HEFFM(I,J,bi,bj) |
761 |
HEFF(I,J,1,bi,bj) = HEFF(I,J,1,bi,bj)*HEFFM(I,J,bi,bj) |
762 |
#ifdef SEAICE_CAP_HEFF |
763 |
HEFF(I,J,1,bi,bj)=MIN(MAX_HEFF,HEFF(I,J,1,bi,bj)) |
764 |
#endif /* SEAICE_CAP_HEFF */ |
765 |
HSNOW(I,J,bi,bj) = HSNOW(I,J,bi,bj)*HEFFM(I,J,bi,bj) |
766 |
ENDDO |
767 |
ENDDO |
768 |
|
769 |
#ifdef ALLOW_DIAGNOSTICS |
770 |
IF ( useDiagnostics ) THEN |
771 |
IF ( DIAGNOSTICS_IS_ON('SIthdgrh',myThid) ) THEN |
772 |
C use (abuse) GHEFF to diagnose the total thermodynamic growth rate |
773 |
DO J=1,sNy |
774 |
DO I=1,sNx |
775 |
GHEFF(I,J) = (HEFF(I,J,1,bi,bj)-HEFF(I,J,2,bi,bj)) |
776 |
& /SEAICE_deltaTtherm |
777 |
ENDDO |
778 |
ENDDO |
779 |
CALL DIAGNOSTICS_FILL(GHEFF,'SIthdgrh',0,1,2,bi,bj,myThid) |
780 |
ENDIF |
781 |
ENDIF |
782 |
#endif /* ALLOW_DIAGNOSTICS */ |
783 |
|
784 |
#ifdef ALLOW_SEAICE_FLOODING |
785 |
IF ( SEAICEuseFlooding ) THEN |
786 |
C convert snow to ice if submerged |
787 |
DO J=1,sNy |
788 |
DO I=1,sNx |
789 |
hDraft = (HSNOW(I,J,bi,bj)*330. _d 0 |
790 |
& +HEFF(I,J,1,bi,bj)*SEAICE_rhoIce)/1000. _d 0 |
791 |
C here GEFF is the gain of ice due to flooding |
792 |
GHEFF(I,J) = hDraft - MIN(hDraft,HEFF(I,J,1,bi,bj)) |
793 |
HEFF(I,J,1,bi,bj) = HEFF(I,J,1,bi,bj) + GHEFF(I,J) |
794 |
HSNOW(I,J,bi,bj) = MAX(0. _d 0, |
795 |
& HSNOW(I,J,bi,bj)-GHEFF(I,J)*ICE2SNOW) |
796 |
ENDDO |
797 |
ENDDO |
798 |
#ifdef ALLOW_DIAGNOSTICS |
799 |
IF ( useDiagnostics ) THEN |
800 |
IF ( DIAGNOSTICS_IS_ON('SIsnwice',myThid) ) THEN |
801 |
C turn GHEFF into a rate |
802 |
DO J=1,sNy |
803 |
DO I=1,sNx |
804 |
GHEFF(I,J) = GHEFF(I,J)/SEAICE_deltaTtherm |
805 |
ENDDO |
806 |
ENDDO |
807 |
CALL DIAGNOSTICS_FILL(GHEFF,'SIsnwice',0,1,2,bi,bj,myThid) |
808 |
ENDIF |
809 |
ENDIF |
810 |
#endif /* ALLOW_DIAGNOSTICS */ |
811 |
ENDIF |
812 |
#endif /* ALLOW_SEAICE_FLOODING */ |
813 |
|
814 |
IF ( useRealFreshWaterFlux ) THEN |
815 |
DO J=1,sNy |
816 |
DO I=1,sNx |
817 |
sIceLoad(i,j,bi,bj) = HEFF(I,J,1,bi,bj)*SEAICE_rhoIce |
818 |
& + HSNOW(I,J,bi,bj)* 330. _d 0 |
819 |
ENDDO |
820 |
ENDDO |
821 |
ENDIF |
822 |
|
823 |
ENDDO |
824 |
ENDDO |
825 |
|
826 |
RETURN |
827 |
END |