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C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.16 2006/04/09 17:35:30 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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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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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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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_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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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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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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C- weighted average net fluxes: |
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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) |
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& - opFrac*Qnet(i,j,bi,bj) |
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icFrwAtm(i,j,bi,bj) = icFrac*icFrwAtm(i,j,bi,bj) |
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& + 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) |
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EmPmR(i,j,bi,bj)= -icFrac*frw2oc(i,j)/rhofw |
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& + opFrac*EmPmR(i,j,bi,bj) |
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saltFlux(i,j,bi,bj) = -icFrac*fsalt(i,j) |
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|
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#ifdef ALLOW_DBUG_THSICE |
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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) |
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#endif |
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|
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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) |
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icFrwAtm(i,j,bi,bj) = rhofw*EmPmR(i,j,bi,bj) |
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ELSE |
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icFlxAtm(i,j,bi,bj) = 0. _d 0 |
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icFrwAtm(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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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.3 : freezing of sea-water |
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C over ice-free fraction and what is left from ice-covered fraction |
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C------- |
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CALL THSICE_EXTEND( |
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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 frzmltMxL, tFrzOce, |
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I tOceMxL(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 Tice1(siLo,sjLo,bi,bj), Tice2(siLo,sjLo,bi,bj), |
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U Qice1(siLo,sjLo,bi,bj), Qice2(siLo,sjLo,bi,bj), |
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O flx2oc, frw2oc, fsalt, |
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I myTime, myIter, myThid ) |
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|
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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IF (frzmltMxL(i,j).GT.0. _d 0) THEN |
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C-- Net fluxes : |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc(i,j) |
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EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc(i,j)/rhofw |
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saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt(i,j) |
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|
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#ifdef ALLOW_DBUG_THSICE |
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IF (dBug(i,j,bi,bj)) WRITE(6,1010) |
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& 'ThSI_FWD:-4- 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) |
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#endif |
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ENDIF |
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|
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IF ( hOceMxL(i,j,bi,bj).GT.0. _d 0 ) |
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& isIceFree(i,j) = iceMask(i,j,bi,bj).LE.0. _d 0 |
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& .AND. iceFrac(i,j) .LE.0. _d 0 |
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IF ( iceFrac(i,j) .GT. 0. _d 0 ) THEN |
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iceMask(i,j,bi,bj)=iceFrac(i,j) |
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IF ( snowHeight(i,j,bi,bj).EQ.0. _d 0 ) |
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& snowAge(i,j,bi,bj) = 0. _d 0 |
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ELSE |
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iceMask(i,j,bi,bj) = 0. _d 0 |
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iceHeight(i,j,bi,bj)= 0. _d 0 |
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snowHeight(i,j,bi,bj)=0. _d 0 |
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snowAge(i,j,bi,bj) = 0. _d 0 |
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Tsrf(i,j,bi,bj) = tOceMxL(i,j,bi,bj) |
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Tice1(i,j,bi,bj) = 0. _d 0 |
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Tice2(i,j,bi,bj) = 0. _d 0 |
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Qice1(i,j,bi,bj) = 0. _d 0 |
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Qice2(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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|
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#ifdef ATMOSPHERIC_LOADING |
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C-- Compute Sea-Ice Loading (= mass of sea-ice + snow / area unit) |
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sIceLoad(i,j,bi,bj) = ( snowHeight(i,j,bi,bj)*rhos |
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& + iceHeight(i,j,bi,bj)*rhoi |
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& )*iceMask(i,j,bi,bj) |
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#endif |
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|
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_BULK_FORCE |
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IF ( useBulkForce ) THEN |
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CALL BULKF_FLUX_ADJUST( |
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I bi, bj, iMin, iMax, jMin, jMax, |
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I isIceFree, myTime, myIter, myThid ) |
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ENDIF |
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#endif /* ALLOW_BULK_FORCE */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#endif /* ALLOW_THSICE */ |
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|
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RETURN |
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END |
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