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jmc |
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C $Header: /u/gcmpack/MITgcm/model/src/calc_grad_phi_hyd.F,v 1.1 2003/02/08 02:09:20 jmc Exp $ |
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jmc |
1.1 |
C $Name: $ |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: CALC_GRAD_PHI_HYD |
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C !INTERFACE: |
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SUBROUTINE CALC_GRAD_PHI_HYD( |
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I k, bi, bj, iMin,iMax, jMin,jMax, |
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I phiHyd, alphRho, tFld, sFld, |
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O dPhiHydX, dPhiHydY, |
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I myTime, myIter, myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R CALC_GRAD_PHI_HYD |
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C | o Calculate the gradient of Hydrostatic potential anomaly |
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C *==========================================================* |
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C \ev |
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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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#include "SURFACE.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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C bi,bj :: tile index |
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C iMin,iMax,jMin,jMax :: Loop counters |
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C phiHyd :: Hydrostatic Potential anomaly |
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C (atmos: =Geopotential ; ocean-z: =Pressure/rho) |
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C alphRho :: Density (z-coord) or specific volume (p-coord) |
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C tFld :: Potential temp. |
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C sFld :: Salinity |
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C dPhiHydX,Y :: Gradient (X & Y directions) of Hyd. Potential |
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C myTime :: Current time |
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C myIter :: Current iteration number |
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C myThid :: Instance number for this call of the routine. |
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INTEGER k, bi,bj, iMin,iMax, jMin,jMax |
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_RL phiHyd(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL alphRho(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL tFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL sFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL dPhiHydX(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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_RL dPhiHydY(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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_RL myTime |
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INTEGER myIter, myThid |
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#ifdef INCLUDE_PHIHYD_CALCULATION_CODE |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j :: Loop counters |
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INTEGER i,j |
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_RL varLoc(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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CEOP |
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DO j=jMin-1,jMax |
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DO i=iMin-1,iMax |
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varLoc(i,j) = phiHyd(i,j,k)+phi0surf(i,j,bi,bj) |
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c varLoc(i,j) = phiHyd(i,j,k) |
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jmc |
1.1 |
ENDDO |
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ENDDO |
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C- Zonal gradient |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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dPhiHydX(i,j) = _recip_dxC(i,j,bi,bj) |
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& *( varLoc(i,j)-varLoc(i-1,j) ) |
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c & *( (phiHyd(i,j,k)-phiHyd(i-1,j,k)) |
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c & +(phi0surf(i,j,bi,bj)-phi0surf(i-1,j,bi,bj)) |
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c & *( (phiHyd(i,j,k)+phi0surf(i,j,bi,bj)) |
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c & -(phiHyd(i-1,j,k)+phi0surf(i-1,j,bi,bj)) |
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c & ) |
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ENDDO |
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ENDDO |
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C- Meridional gradient |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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dPhiHydY(i,j) = _recip_dyC(i,j,bi,bj) |
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& *( varLoc(i,j)-varLoc(i,j-1) ) |
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c & *( (phiHyd(i,j,k)-phiHyd(i,j-1,k)) |
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c & +(phi0surf(i,j,bi,bj)-phi0surf(i,j-1,bi,bj)) |
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c & *( (phiHyd(i,j,k)+phi0surf(i,j,bi,bj)) |
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c & -(phiHyd(i,j-1,k)+phi0surf(i,j-1,bi,bj)) |
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c & ) |
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ENDDO |
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ENDDO |
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#endif /* INCLUDE_PHIHYD_CALCULATION_CODE */ |
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RETURN |
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END |
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