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C $Header: /u/gcmpack/MITgcm/pkg/seaice/diffus.F,v 1.18 2012/11/09 22:15:18 heimbach 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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CBOP |
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C !ROUTINE: DIFFUS |
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C !INTERFACE: |
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SUBROUTINE DIFFUS( |
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U fld, |
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I DIFFA, iceMsk, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R DIFFUS |
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C | o Calculate laplacian of input field |
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C | and return the result in the same array |
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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 "GRID.h" |
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#include "SEAICE_SIZE.h" |
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#include "SEAICE_PARAMS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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C fld :: In: input ice-field ; Out: laplacian of input field |
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C DIFFA :: grid length scale |
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C iceMsk :: Ocean/Land mask |
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C myThid :: my Thread Id. number |
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_RL fld (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL DIFFA (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL iceMsk (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER myThid |
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CEOP |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j,bi,bj :: Loop counters |
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INTEGER i, j, bi, bj |
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_RL DELTXX, DELTYY |
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_RL tmpFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dfx (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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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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IF ( SEAICEuseFluxForm ) THEN |
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C-- Use flux form for MITgcm compliance, unfortunately changes results |
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|
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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dfx(i,j) = 0. _d 0 |
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dfy(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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C-- first compute fluxes across cell faces |
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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dfx(i,j) = _dyG(i,j,bi,bj) * _recip_dxC(i,j,bi,bj) |
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& * (fld(i,j,bi,bj)-fld(i-1,j,bi,bj)) |
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& * cosFacU(j,bi,bj) |
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& * iceMsk(i,j,bi,bj)*iceMsk(i-1,j,bi,bj) |
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& * ( DIFFA(i,j,bi,bj)+DIFFA(i-1,j,bi,bj) )*HALF |
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#ifdef ALLOW_OBCS |
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& * maskInW(i,j,bi,bj) |
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#endif |
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dfy(i,j) = _dxG(i,j,bi,bj) * _recip_dyC(i,j,bi,bj) |
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& * (fld(i,j,bi,bj)-fld(i,j-1,bi,bj)) |
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#ifdef ISOTROPIC_COS_SCALING |
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& * cosFacV(j,bi,bj) |
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#endif |
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& * iceMsk(i,j,bi,bj)*iceMsk(i,j-1,bi,bj) |
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& * ( DIFFA(i,j,bi,bj)+DIFFA(i,j-1,bi,bj) )*HALF |
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#ifdef ALLOW_OBCS |
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& * maskInS(i,j,bi,bj) |
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#endif |
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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,sNx+OLx |
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fld(i,j,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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C-- compute Laplacian as flux divergence |
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DO j=1,sNy |
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DO i=1,sNx |
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fld(i,j,bi,bj) = ( |
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& ( dfx(i+1,j) - dfx(i,j) ) |
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& + ( dfy(i,j+1) - dfy(i,j) ) |
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& ) * recip_rA(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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|
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ELSE |
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C NOW DO DIFFUSION WITH NUIT CONVERSION |
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|
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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tmpFld(i,j) = 0.0 _d 0 |
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ENDDO |
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ENDDO |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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DELTXX = DIFFA(i,j,bi,bj) |
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& * _recip_dxF(i,j,bi,bj)*_recip_dxF(i,j,bi,bj) |
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DELTYY = DIFFA(i,j,bi,bj) |
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& * _recip_dyF(i,j,bi,bj)*_recip_dyF(i,j,bi,bj) |
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& * _recip_dxF(i,j,bi,bj) |
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tmpFld(i,j) = |
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& DELTXX*( |
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& (fld(i+1,j,bi,bj)-fld(i, j,bi,bj)) |
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& *iceMsk(i+1,j,bi,bj) |
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#ifdef ALLOW_OBCS |
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& *maskInW(i+1,j,bi,bj) |
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#endif |
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& -(fld(i, j,bi,bj)-fld(i-1,j,bi,bj)) |
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& *iceMsk(i-1,j,bi,bj) |
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#ifdef ALLOW_OBCS |
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& *maskInW(i,j,bi,bj) |
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#endif |
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& ) |
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& +DELTYY*( |
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& (fld(i,j+1,bi,bj)-fld(i,j, bi,bj)) |
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& * _dxG(i,j+1,bi,bj)*iceMsk(i,j+1,bi,bj) |
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#ifdef ALLOW_OBCS |
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& *maskInS(i,j+1,bi,bj) |
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#endif |
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& -(fld(i,j, bi,bj)-fld(i,j-1,bi,bj)) |
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& * _dxG(i,j, bi,bj)*iceMsk(i,j-1,bi,bj) |
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#ifdef ALLOW_OBCS |
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& *maskInS(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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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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fld(i,j,bi,bj) = tmpFld(i,j) |
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ENDDO |
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ENDDO |
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|
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C-- end flux-form / non flux-form |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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