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C $Header: /u/gcmpack/MITgcm/model/src/calc_common_factors.F,v 1.19 2003/10/09 04:19:18 edhill 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: CALC_COMMON_FACTORS |
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C !INTERFACE: |
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SUBROUTINE CALC_COMMON_FACTORS( |
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I bi,bj,iMin,iMax,jMin,jMax,k, |
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O xA,yA,uTrans,vTrans,rTrans,maskUp, |
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I myThid) |
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C !DESCRIPTION: \bv |
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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 *==========================================================* |
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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 "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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|
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C !INPUT/OUTPUT PARAMETERS: |
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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 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 |
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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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_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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|
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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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CEOP |
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|
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C-- Initialisation |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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xA(i,j) = 0. _d 0 |
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yA(i,j) = 0. _d 0 |
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uTrans(i,j) = 0. _d 0 |
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vTrans(i,j) = 0. _d 0 |
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rTrans(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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|
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C-- Calculate mask for tracer cells (0 => land, 1 => water) |
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IF (K .EQ. 1) THEN |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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maskUp(i,j) = 0. |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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maskUp(i,j) = maskC(i,j,k-1,bi,bj)*maskC(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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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) |
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& *drF(k)*_hFacW(i,j,k,bi,bj) |
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yA(i,j) = _dxG(i,j,bi,bj) |
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& *drF(k)*_hFacS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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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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|
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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) = wVel(i,j,k,bi,bj)*rA(i,j,bi,bj)*maskUp(i,j) |
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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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