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seaice_diffusion.F
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seaice_diffusion.F
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#include "SEAICE_OPTIONS.h"
CBOP
C !ROUTINE: SEAICE_DIFFUSION
C !INTERFACE:
SUBROUTINE SEAICE_DIFFUSION(
I tracerIdentity,
I diffKh, fac,
I iceFld, iceMask, xA, yA,
U gFld,
I bi, bj, myTime, myIter, myThid )
C !DESCRIPTION: \bv
C *==========================================================*
C | SUBROUTINE SEAICE_DIFFUSION
C | o Add tendency from horizontal diffusion
C *==========================================================*
C *==========================================================*
C !USES:
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"
#include "SEAICE_SIZE.h"
#include "SEAICE_PARAMS.h"
CML#include "SEAICE_GRID.h"
C !INPUT PARAMETERS:
C === Routine arguments ===
C afx :: horizontal advective flux, x direction
C afy :: horizontal advective flux, y direction
C myThid :: my Thread Id number
_RL iceFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL gFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL iceMask(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL diffKh, fac
INTEGER tracerIdentity
INTEGER bi,bj
_RL myTime
INTEGER myIter
INTEGER myThid
#ifdef ALLOW_GENERIC_ADVDIFF
#ifdef ALLOW_DIAGNOSTICS
CHARACTER*8 diagName
CHARACTER*4 SEAICE_DIAG_SUFX, diagSufx
EXTERNAL SEAICE_DIAG_SUFX
#endif
CEOP
C !LOCAL VARIABLES:
C === Local variables ===
C i,j :: Loop counters
INTEGER i, j, k
_RL fZon (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL fMer (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
IF ( diffKh .GT. 0. _d 0 ) THEN
#ifdef ALLOW_DIAGNOSTICS
C-- Set diagnostic suffix for the current tracer
IF ( useDiagnostics ) THEN
diagSufx = SEAICE_DIAG_SUFX( tracerIdentity, myThid )
ENDIF
#endif
C-- Tendency due to horizontal diffusion
k = 1
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
fZon (i,j) = 0. _d 0
fMer (i,j) = 0. _d 0
ENDDO
ENDDO
C-- X-direction
CALL GAD_DIFF_X(bi,bj,k,xA,diffKh,iceFld,fZon,myThid)
C-- Y-direction
CALL GAD_DIFF_Y(bi,bj,k,yA,diffKh,iceFld,fMer,myThid)
C-- Divergence of fluxes: update scalar field
DO j=1-OLy,sNy+OLy-1
DO i=1-OLx,sNx+OLx-1
gFld(i,j)= gFld(i,j)
& - fac*iceMask(i,j,bi,bj)*recip_rA(i,j,bi,bj)
& *( (fZon(i+1,j)-fZon(i,j))
& + (fMer(i,j+1)-fMer(i,j)) )
ENDDO
ENDDO
#ifdef ALLOW_DIAGNOSTICS
C- Diagnostics of Tracer flux in Y dir (mainly Diffusive terms),
C excluding advective terms:
IF ( useDiagnostics .AND. diffKh.NE.0. ) THEN
diagName = 'DFxE'//diagSufx
CALL DIAGNOSTICS_FILL(fZon,diagName, k,1, 2,bi,bj, myThid)
diagName = 'DFyE'//diagSufx
CALL DIAGNOSTICS_FILL(fMer,diagName, k,1, 2,bi,bj, myThid)
ENDIF
#endif
C endif do horizontal diffusion
ENDIF
#endif /* ALLOW_GENERIC_ADVDIFF */
RETURN
END