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C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.21 2007/04/17 23:42:33 heimbach Exp $ |
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C $Name: $ |
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|
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#include "THSICE_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: THSICE_STEP_FWD |
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C !INTERFACE: |
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SUBROUTINE THSICE_STEP_FWD( |
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I bi, bj, iMin, iMax, jMin, jMax, |
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I prcAtm, |
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I myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R THSICE_STEP_FWD |
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C | o Step Forward Therm-SeaIce model. |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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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 "FFIELDS.h" |
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#include "THSICE_SIZE.h" |
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#include "THSICE_PARAMS.h" |
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#include "THSICE_VARS.h" |
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#include "THSICE_TAVE.h" |
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#include "THSICE_2DYN.h" |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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# include "tamc_keys.h" |
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#endif |
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|
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INTEGER siLo, siHi, sjLo, sjHi |
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PARAMETER ( siLo = 1-OLx , siHi = sNx+OLx ) |
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PARAMETER ( sjLo = 1-OLy , sjHi = sNy+OLy ) |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C- input: |
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C bi,bj :: tile indices |
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C iMin,iMax :: computation domain: 1rst index range |
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C jMin,jMax :: computation domain: 2nd index range |
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C prcAtm :: total precip from the atmosphere [kg/m2/s] |
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C myTime :: current Time of simulation [s] |
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C myIter :: current Iteration number in simulation |
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C myThid :: my Thread Id number |
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C-- Use fluxes hold in commom blocks |
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C- input: |
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C icFlxSW :: net short-wave heat flux (+=down) below sea-ice, into ocean |
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C icFlxAtm :: net Atmospheric surf. heat flux over sea-ice [W/m2], (+=down) |
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C icFrwAtm :: evaporation over sea-ice to the atmosphere [kg/m2/s] (+=up) |
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C- output |
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C icFlxAtm :: net Atmospheric surf. heat flux over ice+ocean [W/m2], (+=down) |
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C icFrwAtm :: net fresh-water flux (E-P) from the atmosphere [m/s] (+=up) |
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INTEGER bi,bj |
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INTEGER iMin, iMax |
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INTEGER jMin, jMax |
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_RL prcAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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CEOP |
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|
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#ifdef ALLOW_THSICE |
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C !LOCAL VARIABLES: |
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C === Local variables === |
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C iceFrac :: fraction of grid area covered in ice |
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C flx2oc :: net heat flux from the ice to the ocean (+=down) [W/m2] |
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C frw2oc :: fresh-water flux from the ice to the ocean |
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C fsalt :: mass salt flux to the ocean |
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C frzmltMxL :: ocean mixed-layer freezing/melting potential [W/m2] |
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C tFrzOce :: sea-water freezing temperature [oC] (function of S) |
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C isIceFree :: true for ice-free grid-cell that remains ice-free |
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C ageFac :: snow aging factor [1] |
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C snowFac :: snowing refreshing-age factor [units of 1/snowPr] |
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LOGICAL isIceFree(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL iceFrac (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL flx2oc (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL frw2oc (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL fsalt (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL tFrzOce (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL frzmltMxL(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL ageFac |
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_RL snowFac |
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_RL cphm |
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_RL opFrac, icFrac |
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#ifdef ALLOW_DIAGNOSTICS |
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_RL tmpFac |
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#endif |
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INTEGER i,j |
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LOGICAL dBugFlag |
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|
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C- define grid-point location where to print debugging values |
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#include "THSICE_DEBUG.h" |
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|
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1010 FORMAT(A,1P4E14.6) |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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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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|
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C- Initialise |
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dBugFlag = debugLevel.GE.debLevB |
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DO j = 1-OLy, sNy+OLy |
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DO i = 1-OLx, sNx+OLx |
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isIceFree(i,j) = .FALSE. |
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saltFlux(i,j,bi,bj) = 0. _d 0 |
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#ifdef ALLOW_AUTODIFF_TAMC |
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iceFrac(i,j) = 0. |
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#endif |
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ENDDO |
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ENDDO |
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|
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ageFac = 1. _d 0 - thSIce_deltaT/snowAgTime |
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snowFac = thSIce_deltaT/(rhos*hNewSnowAge) |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE iceMask(:,:,bi,bj) = comlev1_bibj, key=iicekey, byte=isbyte |
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#endif |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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C-- Snow aging : |
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snowAge(i,j,bi,bj) = thSIce_deltaT |
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& + snowAge(i,j,bi,bj)*ageFac |
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IF ( snowPrc(i,j,bi,bj).GT.0. _d 0 ) |
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& snowAge(i,j,bi,bj) = snowAge(i,j,bi,bj) |
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& * EXP( - snowFac*snowPrc(i,j,bi,bj) ) |
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c & * EXP( -(thSIce_deltaT*snowPrc(i,j,bi,bj)/rhos) |
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c & /hNewSnowAge ) |
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C------- |
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C note: Any flux of mass (here fresh water) that enter or leave the system |
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C with a non zero energy HAS TO be counted: add snow precip. |
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icFlxAtm(i,j,bi,bj) = icFlxAtm(i,j,bi,bj) |
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& - Lfresh*snowPrc(i,j,bi,bj) |
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C-- |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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tmpFac = 1. _d 0 |
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CALL DIAGNOSTICS_FILL(iceMask,'SI_FrcFx',0,1,1,bi,bj,myThid) |
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CALL DIAGNOSTICS_FRACT_FILL( |
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I snowPrc, iceMask,tmpFac,1,'SIsnwPrc', |
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I 0,1,1,bi,bj,myThid) |
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CALL DIAGNOSTICS_FRACT_FILL( |
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I siceAlb, iceMask,tmpFac,1,'SIalbedo', |
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I 0,1,1,bi,bj,myThid) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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siceAlb(i,j,bi,bj) = iceMask(i,j,bi,bj)*siceAlb(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C part.2 : ice-covered fraction ; |
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C change in ice/snow thickness and ice-fraction |
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C note: can only reduce the ice-fraction but not increase it. |
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C------- |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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|
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tFrzOce(i,j) = -mu_Tf*sOceMxL(i,j,bi,bj) |
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cphm = cpwater*rhosw*hOceMxL(i,j,bi,bj) |
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frzmltMxL(i,j) = ( tFrzOce(i,j)-tOceMxL(i,j,bi,bj) ) |
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& * cphm/ocean_deltaT |
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iceFrac(i,j) = iceMask(i,j,bi,bj) |
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flx2oc(i,j) = icFlxSW(i,j,bi,bj) |
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C------- |
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#ifdef ALLOW_DBUG_THSICE |
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IF ( dBug(i,j,bi,bj) ) THEN |
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IF (frzmltMxL(i,j).GT.0. .OR. iceFrac(i,j).GT.0.) THEN |
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WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj |
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WRITE(6,1010) 'ThSI_FWD:-1- iceMask, hIc, hSn, Tsf =', |
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& iceFrac(i,j), iceHeight(i,j,bi,bj), |
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& snowHeight(i,j,bi,bj), Tsrf(i,j,bi,bj) |
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WRITE(6,1010) 'ThSI_FWD: ocTs,tFrzOce,frzmltMxL,Qnet=', |
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& tOceMxL(i,j,bi,bj), tFrzOce(i,j), |
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& frzmltMxL(i,j), Qnet(i,j,bi,bj) |
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ENDIF |
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IF (iceFrac(i,j).GT.0.) |
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& WRITE(6,1010) 'ThSI_FWD: icFrac,flxAtm,evpAtm,flxSnw=', |
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& iceFrac(i,j), icFlxAtm(i,j,bi,bj), |
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& icFrwAtm(i,j,bi,bj),-Lfresh*snowPrc(i,j,bi,bj) |
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ENDIF |
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#endif |
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE iceMask(:,:,bi,bj) = comlev1_bibj, key=iicekey, byte=isbyte |
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#endif |
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|
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CALL THSICE_CALC_THICKN( |
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I bi, bj, siLo, siHi, sjLo, sjHi, |
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I iMin,iMax, jMin,jMax, dBugFlag, |
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I iceMask(siLo,sjLo,bi,bj), tFrzOce, |
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I tOceMxL(siLo,sjLo,bi,bj), v2ocMxL(siLo,sjLo,bi,bj), |
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I snowPrc(siLo,sjLo,bi,bj), prcAtm, |
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I sHeating(siLo,sjLo,bi,bj), flxCndBt(siLo,sjLo,bi,bj), |
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U iceFrac, iceHeight(siLo,sjLo,bi,bj), |
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U snowHeight(siLo,sjLo,bi,bj), Tsrf(siLo,sjLo,bi,bj), |
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U Qice1(siLo,sjLo,bi,bj), Qice2(siLo,sjLo,bi,bj), |
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U icFrwAtm(siLo,sjLo,bi,bj), frzmltMxL, flx2oc, |
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O frw2oc, fsalt, |
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I myTime, myIter, myThid ) |
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|
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C-- Net fluxes : |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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#ifdef ALLOW_AUTODIFF_TAMC |
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ikey_1 = i |
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& + sNx*(j-1) |
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& + sNx*sNy*act1 |
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& + sNx*sNy*max1*act2 |
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& + sNx*sNy*max1*max2*act3 |
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& + sNx*sNy*max1*max2*max3*act4 |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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C-- |
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE icemask(i,j,bi,bj) = comlev1_thsice_1, key=ikey_1 |
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#endif |
| 243 |
IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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C- weighted average net fluxes: |
| 245 |
#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE fsalt(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE flx2oc(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE frw2oc(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE icemask(i,j,bi,bj) = comlev1_thsice_1, key=ikey_1 |
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#endif |
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icFrac = iceMask(i,j,bi,bj) |
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opFrac= 1. _d 0-icFrac |
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icFlxAtm(i,j,bi,bj) = icFrac*icFlxAtm(i,j,bi,bj) |
| 254 |
& - opFrac*Qnet(i,j,bi,bj) |
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icFrwAtm(i,j,bi,bj) = icFrac*icFrwAtm(i,j,bi,bj) |
| 256 |
& + opFrac*rhofw*EmPmR(i,j,bi,bj) |
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Qnet(i,j,bi,bj) = -icFrac*flx2oc(i,j) + opFrac*Qnet(i,j,bi,bj) |
| 258 |
EmPmR(i,j,bi,bj)= -icFrac*frw2oc(i,j)/rhofw |
| 259 |
& + opFrac*EmPmR(i,j,bi,bj) |
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saltFlux(i,j,bi,bj) = -icFrac*fsalt(i,j) |
| 261 |
|
| 262 |
#ifdef ALLOW_DBUG_THSICE |
| 263 |
IF (dBug(i,j,bi,bj)) WRITE(6,1010) |
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& 'ThSI_FWD:-3- iceFrac, hIc, hSn, Qnet =', |
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& iceFrac(i,j), iceHeight(i,j,bi,bj), |
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& snowHeight(i,j,bi,bj), Qnet(i,j,bi,bj) |
| 267 |
#endif |
| 268 |
|
| 269 |
ELSEIF (hOceMxL(i,j,bi,bj).gt.0. _d 0) THEN |
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icFlxAtm(i,j,bi,bj) = -Qnet(i,j,bi,bj) |
| 271 |
icFrwAtm(i,j,bi,bj) = rhofw*EmPmR(i,j,bi,bj) |
| 272 |
ELSE |
| 273 |
icFlxAtm(i,j,bi,bj) = 0. _d 0 |
| 274 |
icFrwAtm(i,j,bi,bj) = 0. _d 0 |
| 275 |
ENDIF |
| 276 |
ENDDO |
| 277 |
ENDDO |
| 278 |
|
| 279 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 280 |
C part.3 : freezing of sea-water |
| 281 |
C over ice-free fraction and what is left from ice-covered fraction |
| 282 |
C------- |
| 283 |
CALL THSICE_EXTEND( |
| 284 |
I bi, bj, siLo, siHi, sjLo, sjHi, |
| 285 |
I iMin,iMax, jMin,jMax, dBugFlag, |
| 286 |
I frzmltMxL, tFrzOce, |
| 287 |
I tOceMxL(siLo,sjLo,bi,bj), |
| 288 |
U iceFrac, iceHeight(siLo,sjLo,bi,bj), |
| 289 |
U snowHeight(siLo,sjLo,bi,bj), Tsrf(siLo,sjLo,bi,bj), |
| 290 |
U Tice1(siLo,sjLo,bi,bj), Tice2(siLo,sjLo,bi,bj), |
| 291 |
U Qice1(siLo,sjLo,bi,bj), Qice2(siLo,sjLo,bi,bj), |
| 292 |
O flx2oc, frw2oc, fsalt, |
| 293 |
I myTime, myIter, myThid ) |
| 294 |
|
| 295 |
#ifdef ALLOW_AUTODIFF_TAMC |
| 296 |
CADJ STORE snowHeight(:,:,bi,bj) = |
| 297 |
CADJ & comlev1_bibj, key=iicekey, byte=isbyte |
| 298 |
#endif |
| 299 |
DO j = jMin, jMax |
| 300 |
DO i = iMin, iMax |
| 301 |
IF (frzmltMxL(i,j).GT.0. _d 0) THEN |
| 302 |
C-- Net fluxes : |
| 303 |
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc(i,j) |
| 304 |
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc(i,j)/rhofw |
| 305 |
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt(i,j) |
| 306 |
|
| 307 |
#ifdef ALLOW_DBUG_THSICE |
| 308 |
IF (dBug(i,j,bi,bj)) WRITE(6,1010) |
| 309 |
& 'ThSI_FWD:-4- iceFrac, hIc, hSn, Qnet =', |
| 310 |
& iceFrac(i,j), iceHeight(i,j,bi,bj), |
| 311 |
& snowHeight(i,j,bi,bj), Qnet(i,j,bi,bj) |
| 312 |
#endif |
| 313 |
ENDIF |
| 314 |
|
| 315 |
IF ( hOceMxL(i,j,bi,bj).GT.0. _d 0 ) |
| 316 |
& isIceFree(i,j) = iceMask(i,j,bi,bj).LE.0. _d 0 |
| 317 |
& .AND. iceFrac(i,j) .LE.0. _d 0 |
| 318 |
IF ( iceFrac(i,j) .GT. 0. _d 0 ) THEN |
| 319 |
iceMask(i,j,bi,bj)=iceFrac(i,j) |
| 320 |
IF ( snowHeight(i,j,bi,bj).EQ.0. _d 0 ) |
| 321 |
& snowAge(i,j,bi,bj) = 0. _d 0 |
| 322 |
ELSE |
| 323 |
iceMask(i,j,bi,bj) = 0. _d 0 |
| 324 |
iceHeight(i,j,bi,bj)= 0. _d 0 |
| 325 |
snowHeight(i,j,bi,bj)=0. _d 0 |
| 326 |
snowAge(i,j,bi,bj) = 0. _d 0 |
| 327 |
Tsrf(i,j,bi,bj) = tOceMxL(i,j,bi,bj) |
| 328 |
Tice1(i,j,bi,bj) = 0. _d 0 |
| 329 |
Tice2(i,j,bi,bj) = 0. _d 0 |
| 330 |
Qice1(i,j,bi,bj) = Lfresh |
| 331 |
Qice2(i,j,bi,bj) = Lfresh |
| 332 |
ENDIF |
| 333 |
ENDDO |
| 334 |
ENDDO |
| 335 |
|
| 336 |
#ifdef ATMOSPHERIC_LOADING |
| 337 |
# ifdef ALLOW_AUTODIFF_TAMC |
| 338 |
CADJ STORE snowHeight(:,:,bi,bj) = |
| 339 |
CADJ & comlev1_bibj, key=iicekey, byte=isbyte |
| 340 |
# endif |
| 341 |
DO j = jMin, jMax |
| 342 |
DO i = iMin, iMax |
| 343 |
C-- Compute Sea-Ice Loading (= mass of sea-ice + snow / area unit) |
| 344 |
sIceLoad(i,j,bi,bj) = ( snowHeight(i,j,bi,bj)*rhos |
| 345 |
& + iceHeight(i,j,bi,bj)*rhoi |
| 346 |
& )*iceMask(i,j,bi,bj) |
| 347 |
ENDDO |
| 348 |
ENDDO |
| 349 |
#endif |
| 350 |
|
| 351 |
IF ( thSIceAdvScheme.GT.0 ) THEN |
| 352 |
C-- note: those fluxes should to be added directly to Qnet, EmPmR & saltFlux |
| 353 |
DO j = jMin, jMax |
| 354 |
DO i = iMin, iMax |
| 355 |
IF ( hOceMxL(i,j,bi,bj).GT.0. _d 0 ) THEN |
| 356 |
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - oceQnet(i,j,bi,bj) |
| 357 |
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- oceFWfx(i,j,bi,bj)/rhofw |
| 358 |
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - oceSflx(i,j,bi,bj) |
| 359 |
ENDIF |
| 360 |
ENDDO |
| 361 |
ENDDO |
| 362 |
ENDIF |
| 363 |
|
| 364 |
#ifdef ALLOW_BULK_FORCE |
| 365 |
IF ( useBulkForce ) THEN |
| 366 |
CALL BULKF_FLUX_ADJUST( |
| 367 |
I bi, bj, iMin, iMax, jMin, jMax, |
| 368 |
I isIceFree, myTime, myIter, myThid ) |
| 369 |
ENDIF |
| 370 |
#endif /* ALLOW_BULK_FORCE */ |
| 371 |
|
| 372 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 373 |
#endif /* ALLOW_THSICE */ |
| 374 |
|
| 375 |
RETURN |
| 376 |
END |
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