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C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_diffusion.F,v 1.1 2007/04/04 02:40:42 jmc Exp $ |
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C $Name: $ |
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#include "THSICE_OPTIONS.h" |
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CBOP |
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C !ROUTINE: THSICE_DIFFUSION |
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C !INTERFACE: ========================================================== |
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SUBROUTINE THSICE_DIFFUSION( |
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I maskOc, |
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U uIce, vIce, |
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I bi, bj, myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *===========================================================* |
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C | SUBROUTINE THSICE_DIFFUSION |
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C | o Account for total (ice+snow) thickness diffusion by |
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C | modifying ice-velocity: |
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C | If no velocity in the first place, and if using 1rst Order |
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C | upwind adv.scheme, this is equivalent to a diffusion of |
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C | ice+snow thichness. |
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C *===========================================================* |
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C \ev |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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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 "GRID.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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C !INPUT PARAMETERS: =================================================== |
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C === Routine arguments === |
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C maskOc :: ocean surface mask (0=land ; 1=ocean) |
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C uIce/vIce :: current ice velocity on C-grid [m/s] |
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C bi,bj :: Tile indices |
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C myTime :: Current time in simulation (s) |
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C myIter :: Current iteration number |
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C myThid :: My Thread Id number |
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_RS maskOc(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uIce (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vIce (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER bi,bj |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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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 i,j, :: Loop counters |
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C iceFld :: sea-ice + snow mass density |
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jmc |
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C msgBuf :: Informational/error message buffer |
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INTEGER i, j |
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c CHARACTER*(MAX_LEN_MBUF) msgBuf |
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_RL iceFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL tmpFld, hIceEpsil |
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LOGICAL dBugFlag |
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c#include "THSICE_DEBUG.h" |
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CEOP |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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dBugFlag = debugLevel.GE.debLevB |
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hIceEpsil = 1. _d -10 |
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IF ( thSIce_diffK .GT. 0. ) THEN |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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iceFld(i,j) = ( rhos*snowHeight(i,j,bi,bj) |
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& +rhoi*iceHeight(i,j,bi,bj) ) |
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c *iceMask(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx+1,sNx+OLx |
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tmpFld = MAX( iceFld(i-1,j),iceFld(i,j) ) |
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& * maskOc(i-1,j)*maskOc(i,j) |
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IF ( tmpFld.GT.hIceEpsil ) |
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& uIce(i,j) = uIce(i,j) |
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& + thSIce_diffK*( iceFld(i-1,j)-iceFld(i,j) ) |
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& *recip_dxC(i,j,bi,bj)/tmpFld |
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ENDDO |
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ENDDO |
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DO j=1-OLy+1,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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tmpFld = MAX( iceFld(i,j-1),iceFld(i,j) ) |
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& *maskOc(i,j-1)*maskOc(i,j) |
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IF ( tmpFld.GT.hIceEpsil ) |
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& vIce(i,j) = vIce(i,j) |
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& + thSIce_diffK*( iceFld(i,j-1)-iceFld(i,j) ) |
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& *recip_dyC(i,j,bi,bj)/tmpFld |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif /* ALLOW_THSICE */ |
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RETURN |
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END |
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