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jmc |
1.5 |
C $Header: $ |
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mlosch |
1.1 |
C $Name: $ |
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#include "SEAICE_OPTIONS.h" |
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jmc |
1.5 |
CBOP |
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C !ROUTINE: SEAICE_DIFFUSION |
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C !INTERFACE: |
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SUBROUTINE SEAICE_DIFFUSION( |
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I tracerIdentity, |
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I iceFld, iceMask, xA, yA, |
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U gFld, |
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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 SEAICE_DIFFUSION |
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C | o Add tendency from horizontal diffusion |
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C *==========================================================* |
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C *==========================================================* |
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C !USES: |
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mlosch |
1.1 |
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 "SEAICE_PARAMS.h" |
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CML#include "SEAICE_GRID.h" |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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#endif |
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jmc |
1.5 |
C !INPUT PARAMETERS: |
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mlosch |
1.1 |
C === Routine arguments === |
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jmc |
1.5 |
C afx :: horizontal advective flux, x direction |
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C afy :: horizontal advective flux, y direction |
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C myThid :: my Thread Id number |
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_RL iceFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL gFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL iceMask(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER advScheme |
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INTEGER tracerIdentity |
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INTEGER bi,bj |
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mlosch |
1.1 |
_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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jmc |
1.5 |
CEOP |
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mlosch |
1.1 |
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jmc |
1.5 |
C !LOCAL VARIABLES: |
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mlosch |
1.1 |
C === Local variables === |
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jmc |
1.5 |
C i,j :: Loop counters |
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INTEGER i, j, k |
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_RL fZon (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL fMer (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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IF ( diff1 .GT. 0. _d 0 ) THEN |
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C-- Tendency due to horizontal diffusion |
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k = 1 |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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fZon (i,j) = 0. _d 0 |
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fMer (i,j) = 0. _d 0 |
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mlosch |
1.1 |
ENDDO |
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ENDDO |
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jmc |
1.5 |
C-- X-direction |
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CALL GAD_DIFF_X(bi,bj,k,xA,diff1,iceFld,fZon,myThid) |
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C-- Y-direction |
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CALL GAD_DIFF_Y(bi,bj,k,yA,diff1,iceFld,fMer,myThid) |
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C-- Divergence of fluxes: update scalar field |
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C-- Ugly: |
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C-- Apply factor min(DX,DY) to effectively end up with approximately |
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C-- the same diffusion coefficient as in subroutine ADVECT. |
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C-- One day, I would like to rewrite the second order central difference |
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C-- part, too, so that the value of DIFF1 has the same meaning as, |
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C-- say, diffKhT |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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gFld(i,j)= gFld(i,j) |
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& - iceMask(i,j,bi,bj)*recip_rA(i,j,bi,bj) |
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& *( (fZon(i+1,j)-fZon(i,j)) |
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& + (fMer(i,j+1)-fMer(i,j)) ) |
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& *MIN( _dxF(I,J,bi,bj), _dyF(I,J,bi,bj)) |
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mlosch |
1.1 |
ENDDO |
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ENDDO |
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jmc |
1.5 |
C endif do horizontal diffusion |
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ENDIF |
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mlosch |
1.1 |
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RETURN |
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END |
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