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C $Header: /u/gcmpack/models/MITgcmUV/model/src/calc_common_factors.F,v 1.6 1998/06/08 21:43:00 cnh Exp $ |
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#include "CPP_EEOPTIONS.h" |
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CStartOfInterFace |
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SUBROUTINE CALC_COMMON_FACTORS( |
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I bi,bj,iMin,iMax,jMin,jMax,k,kM1,kUp,kDown, |
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O xA,yA,uTrans,vTrans,rTrans,rVel,maskC,maskUp, |
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I myThid) |
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C /==========================================================\ |
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C | SUBROUTINE CALC_COMMON_FACTORS | |
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C | o Calculate common data (such as volume flux) for use | |
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C | by "Right hand side" subroutines. | |
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C |==========================================================| |
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C | Here, we calculate terms or spatially varying factors | |
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C | that are used at various points in the "RHS" subroutines.| |
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C | This reduces the amount of total work, total memory | |
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C | and therefore execution time and is generally a good | |
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C | idea. | |
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C | We also think lower taxes are a good idea but we doubt | |
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C | whether we'll ever get them. | |
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C \==========================================================/ |
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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 "DYNVARS.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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C == Routine arguments == |
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C bi, bj, iMin, iMax, jMin, jMax - Range of points for which calculation |
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C results will be set. |
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C xA - Tracer cell face area normal to X |
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C yA - Tracer cell face area normal to X |
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C uTrans - Zonal volume transport through cell face |
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C vTrans - Meridional volume transport through cell face |
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C rTrans - R-direction volume transport through cell face |
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C rVel - R-direction velocity at cell upper and lower faces |
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C maskC - land/water mask for tracer points |
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C maskUp - land/water mask for Wvel points (above tracer level) |
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C myThid - Instance number for this innvocation of CALC_COMMON_FACTORS |
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C |
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INTEGER bi,bj,iMin,iMax,jMin,jMax,k,kM1,kUp,kDown |
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_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL rTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL rVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,2) |
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_RS maskC (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS maskUp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C |
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INTEGER myThid |
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CEndOfInterface |
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C == Local variables == |
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C I, J, K - Loop counters |
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C kUp, kDown, kM1 - Index for layer above and below. K_UP and K_DOWN |
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C are switched with layer to be the appropriate index |
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C into fluxUD. |
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INTEGER i,j |
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LOGICAL TOP_LAYER |
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TOP_LAYER = K .EQ. 1 |
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C-- Calculate tracer cell face open areas |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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xA(i,j) = _dyG(i,j,bi,bj)*drF(k)*_hFacW(i,j,k,bi,bj) |
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yA(i,j) = _dxG(i,j,bi,bj)*drF(k)*_hFacS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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C-- Calculate velocity field "volume transports" through |
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C-- tracer cell faces. |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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uTrans(i,j) = uVel(i,j,k,bi,bj)*xA(i,j) |
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vTrans(i,j) = vVel(i,j,k,bi,bj)*yA(i,j) |
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ENDDO |
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ENDDO |
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C-- Calculate vertical "volume transport" through |
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C-- tracer cell face *above* this level. |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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rTrans(i,j) = uTrans(i,j)*recip_rkFac-uTrans(i+1,j)*_recip_rkFac |
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& +vTrans(i,j)*_recip_rkFac-vTrans(i,j+1)*_recip_rkFac |
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& +rTrans(i,j) |
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ENDDO |
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ENDDO |
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C-- Vertical velocity at upper face |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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rVel(i,j,kUp) = rTrans(i,j)/_rA(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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C-- Calculate mask for tracer cells (0 => land, 1 => water) |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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maskC(i,j) = 1. |
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if (_hFacC(i,j,k,bi,bj).eq.0.) maskC(i,j)=0. |
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maskUp(i,j) = 1. |
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if (_hFacC(i,j,k,bi,bj).eq.0. .or. TOP_LAYER ) maskUp(i,j)=0. |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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