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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_grad_y.F,v 1.8 2007/08/16 02:16:37 jmc Exp $ |
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C $Name: $ |
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|
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#include "GAD_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: GAD_GRAD_Y |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_GRAD_Y( |
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I bi,bj,k, |
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I yA, |
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U tracer, |
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O dTdy, |
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I myThid ) |
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|
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C !DESCRIPTION: |
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C Calculates the meridional gradient of a tracer: $\partial_y \theta |
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C = \frac{1}{\Delta y_c} \delta_j \theta$ |
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C and multiplies by the area. |
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|
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C !USES: =============================================================== |
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IMPLICIT NONE |
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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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|
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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 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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INTEGER myThid |
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|
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C !UPDATED PARAMETERS: ================================================= |
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C tracer :: tracer field |
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C (NOTE: only udate the corner-halo region when using CS-grid) |
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_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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C !OUTPUT PARAMETERS: ================================================== |
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C dTdy :: meridional gradient (units= [Tr_units]*[r_units]) |
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_RL dTdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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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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CEOP |
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|
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cph-exch2#ifndef ALLOW_AUTODIFF_TAMC |
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C-- Internal exchange for calculations in Y |
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IF (useCubedSphereExchange) THEN |
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CALL FILL_CS_CORNER_TR_RL( 2, .FALSE., |
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& tracer, bi,bj, myThid ) |
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ENDIF |
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cph-exch2#endif |
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|
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C o Meridional tracer gradient |
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DO i=1-Olx,sNx+Olx |
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dTdy(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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dTdy(i,j) = yA(i,j) |
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& *_recip_dyC(i,j,bi,bj)*recip_deepFacC(k) |
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& *(tracer(i,j)-tracer(i,j-1)) |
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#ifdef ISOTROPIC_COS_SCALING |
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#ifdef COSINEMETH_III |
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& *sqCosFacV(j,bi,bj) |
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#endif |
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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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