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C $Header: /u/gcmpack/MITgcm/model/src/grad_sigma.F,v 1.9 2008/10/22 00:26:20 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: GRAD_SIGMA |
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C !INTERFACE: |
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SUBROUTINE GRAD_SIGMA( |
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I bi, bj, iMin, iMax, jMin, jMax, k, |
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I rhoK, sigKm1, sigKp1, |
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O sigmaX, sigmaY, sigmaR, |
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I myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE GRAD_SIGMA |
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C | o Calculate isoneutral gradients |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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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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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C bi, bj :: tile indices |
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C iMin,iMax :: not used |
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C jMin,jMax :: not used |
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C k :: current level index |
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C rhoK :: density at level k |
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C sigKm1 :: upper level density computed at current pressure |
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C sigKp1 :: lower level density computed at current pressure |
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C sigmaX,Y,R :: iso-neutral gradient of density in 3 directions X,Y,R |
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C myThid :: my Thread Id. number |
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INTEGER bi,bj,iMin,iMax,jMin,jMax,k |
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_RL rhoK(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL sigKm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL sigKp1(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL sigmaX(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sigmaY(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sigmaR(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C rhoLoc :: local copy of rhoK |
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INTEGER i,j |
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_RL rhoLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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CEOP |
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|
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C- safer to work on a local copy of rhoK (before a partial update) |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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rhoLoc(i,j) = rhoK(i,j) |
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ENDDO |
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ENDDO |
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|
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C- Internal exchange for calculations in X |
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cph-exch2#ifndef ALLOW_AUTODIFF_TAMC |
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IF ( useCubedSphereExchange ) THEN |
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CALL FILL_CS_CORNER_TR_RL( 1, .FALSE., |
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& rhoLoc, bi,bj, myThid ) |
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ENDIF |
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cph-exch2#endif |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx+1,sNx+OLx |
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sigmaX(i,j,k)=_maskW(i,j,k,bi,bj) |
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& *_recip_dxC(i,j,bi,bj) |
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& *(rhoLoc(i,j)-rhoLoc(i-1,j)) |
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ENDDO |
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ENDDO |
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|
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C- Internal exchange for calculations in Y |
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cph-exch2#ifndef ALLOW_AUTODIFF_TAMC |
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IF ( useCubedSphereExchange ) THEN |
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CALL FILL_CS_CORNER_TR_RL( 2, .FALSE., |
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& rhoLoc, bi,bj, myThid ) |
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ENDIF |
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cph-exch2#endif |
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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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sigmaY(i,j,k)=_maskS(i,j,k,bi,bj) |
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& *_recip_dyC(i,j,bi,bj) |
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& *(rhoLoc(i,j)-rhoLoc(i,j-1)) |
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ENDDO |
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ENDDO |
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|
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IF (k.EQ.1) 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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sigmaR(i,j,k)= 0. _d 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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sigmaR(i,j,k)= maskC(i,j,k,bi,bj)*maskC(i,j,k-1,bi,bj) |
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& *recip_drC(k)*rkSign |
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& *(sigKp1(i,j)-sigKm1(i,j)) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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RETURN |
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END |
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