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jmc |
1.4 |
C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_r.F,v 1.3 2001/09/21 13:11:43 adcroft Exp $ |
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adcroft |
1.2 |
C $Name: $ |
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adcroft |
1.1 |
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#include "GAD_OPTIONS.h" |
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adcroft |
1.2 |
CBOP |
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C !ROUTINE: GAD_DIFF_R |
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C !INTERFACE: ========================================================== |
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adcroft |
1.1 |
SUBROUTINE GAD_DIFF_R( |
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I bi,bj,k, |
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I KappaR, |
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I tracer, |
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O dfr, |
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I myThid ) |
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adcroft |
1.2 |
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C !DESCRIPTION: |
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adcroft |
1.3 |
C Calculates the area integrated vertical flux due to down-gradient |
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C diffusion of a tracer: |
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adcroft |
1.2 |
C \begin{equation*} |
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adcroft |
1.3 |
C F^r_{diff} = - A^r \kappa_r \frac{1}{\Delta r_c} \delta_k \theta |
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adcroft |
1.2 |
C \end{equation*} |
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C !USES: =============================================================== |
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adcroft |
1.1 |
IMPLICIT NONE |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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adcroft |
1.2 |
C !INPUT PARAMETERS: =================================================== |
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C bi,bj :: tile indices |
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C k :: vertical level |
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C KappaR :: vertical diffusivity |
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C tracer :: tracer field |
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C myThid :: thread number |
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adcroft |
1.1 |
INTEGER bi,bj,k |
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jmc |
1.4 |
_RL KappaR(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.1 |
_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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adcroft |
1.2 |
INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C dfr :: vertical diffusive flux |
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adcroft |
1.1 |
_RL dfr (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.2 |
C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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C km1 :: =k+1 for k<Nr, =Nr for k>-Nr |
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adcroft |
1.1 |
INTEGER i,j,km1 |
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adcroft |
1.3 |
CEOP |
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adcroft |
1.1 |
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km1=max(1,k-1) |
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IF (k.eq.1 .OR. k.gt.Nr) 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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dfr(i,j) = 0. |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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dfr(i,j) = |
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& -_rA(i,j,bi,bj) |
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jmc |
1.4 |
& *KappaR(i,j)*recip_drC(k) |
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adcroft |
1.1 |
& *(Tracer(i,j,km1,bi,bj)-Tracer(i,j,k,bi,bj))*rkFac |
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ENDDO |
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ENDDO |
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ENDIF |
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RETURN |
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END |
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