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cnh |
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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_y.F,v 1.3 2001/09/21 13:11:43 adcroft Exp $ |
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C $Name: checkpoint51c_post $ |
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#include "GAD_OPTIONS.h" |
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CBOP |
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C !ROUTINE: GAD_DIFF_Y |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_DIFF_Y( |
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I bi,bj,k, |
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I yA, diffKh, |
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I tracer, |
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O dfy, |
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I myThid ) |
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C !DESCRIPTION: |
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C Calculates the area integrated meridional flux due to down-gradient |
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C diffusion of a tracer: |
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C \begin{equation*} |
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C F^y_{diff} = - A^y \kappa_h \frac{1}{\Delta y_c} \delta_j \theta |
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C \end{equation*} |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "GRID.h" |
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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 yA :: area of face at V points |
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C diffKh :: horizontal diffusivity |
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C tracer :: tracer field |
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C myThid :: thread number |
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INTEGER bi,bj,k |
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_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL diffKh |
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_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C dfx :: meridional diffusive flux |
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_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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INTEGER i,j |
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_RS gridScalingAh |
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CEOP |
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DO i=1-Olx,sNx+Olx |
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dfy(i,1-Oly)=0. |
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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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gridScalingAh = (_dyC(i,j,bi,bj)**2)/(5000.**2) |
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dfy(i,j) = -diffKh*yA(i,j) |
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& *_recip_dyC(i,j,bi,bj) |
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& *(Tracer(i,j)-Tracer(i,j-1)) |
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& *gridScalingAh |
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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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ENDDO |
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ENDDO |
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RETURN |
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END |
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