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jmc |
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C $Header: /u/gcmpack/MITgcm/model/src/calc_grad_phi_hyd.F,v 1.14 2011/12/14 01:12:59 jmc Exp $ |
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C $Name: $ |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: CALC_GRAD_PHI_FV |
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C !INTERFACE: |
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SUBROUTINE CALC_GRAD_PHI_FV( |
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I k, bi, bj, iMin,iMax, jMin,jMax, |
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I phiHydF, phiHydU, pKappaF, pKappaU, |
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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_FV |
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C | o Calculate the gradient of Hydrostatic pressure anomaly |
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C | using Finite-Volume method from S.-J. Lin (QJRMS, 1997) |
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C *==========================================================* |
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C | o used with sigma-coords - might be useful also with r* |
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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#include "DYNVARS.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 phiHydF :: hydrostatic potential anomaly at interface k |
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C (atmos: =Geopotential ; ocean-z: =Pressure/rho) |
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C phiHydU :: hydrostatic potential anomaly at interface k+1 (Upper k) |
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C pKappaF :: (p/Po)^kappa at interface k |
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C pKappaU :: (p/Po)^kappa at interface k+1 (Upper k) |
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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 phiHydF(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL phiHydU(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL pKappaF(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL pKappaU(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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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 dpk_dip, dpk_dim |
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_RL dpk_djp, dpk_djm |
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c CHARACTER*(MAX_LEN_MBUF) msgBuf |
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CEOP |
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C-- Zonal & Meridional gradient of potential anomaly |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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dPhiHydX(i,j) = 0. _d 0 |
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dPhiHydY(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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DO j=jMin,jMax |
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DO i=iMin+1,iMax |
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dpk_dip = pKappaF( i ,j) - pKappaU(i-1,j) |
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dpk_dim = pKappaF(i-1,j) - pKappaU( i ,j) |
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dPhiHydX(i,j) = ( phi0surf(i,j,bi,bj) - phi0surf(i-1,j,bi,bj) ) |
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& + ( dpk_dip*( phiHydU(i,j) - phiHydF(i-1,j) ) |
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& + dpk_dim*( phiHydF(i,j) - phiHydU(i-1,j) ) |
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& )/( dpk_dip + dpk_dim ) |
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dPhiHydX(i,j) = _recip_dxC(i,j,bi,bj)*dPhiHydX(i,j) |
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c & * recip_deepFacC(k)*recip_rhoFacC(k) |
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ENDDO |
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ENDDO |
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DO j=jMin+1,jMax |
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DO i=iMin,iMax |
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dpk_djp = pKappaF(i, j ) - pKappaU(i,j-1) |
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dpk_djm = pKappaF(i,j-1) - pKappaU(i, j ) |
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dPhiHydY(i,j) = ( phi0surf(i,j,bi,bj) - phi0surf(i,j-1,bi,bj) ) |
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& + ( dpk_djp*( phiHydU(i,j) - phiHydF(i,j-1) ) |
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& + dpk_djm*( phiHydF(i,j) - phiHydU(i,j-1) ) |
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& )/( dpk_djp + dpk_djm ) |
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dPhiHydY(i,j) = _recip_dyC(i,j,bi,bj)*dPhiHydY(i,j) |
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c & * recip_deepFacC(k)*recip_rhoFacC(k) |
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ENDDO |
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ENDDO |
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C-- Apply mask: |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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dPhiHydX(i,j) = dPhiHydX(i,j)*_maskW(i,j,k,bi,bj) |
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dPhiHydY(i,j) = dPhiHydY(i,j)*_maskS(i,j,k,bi,bj) |
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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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