C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_calc_hdiv.F,v 1.5 2015/09/10 17:53:04 jmc Exp $ C $Name: $ #include "MOM_COMMON_OPTIONS.h" SUBROUTINE MOM_CALC_HDIV( I bi,bj,k, hDivScheme, I uFld, vFld, O hDiv, I myThid ) IMPLICIT NONE C *==========================================================* C | S/R MOM_CALC_HDIV | C *==========================================================* C *==========================================================* C == Global variables == #include "SIZE.h" #include "EEPARAMS.h" #include "PARAMS.h" #include "GRID.h" C == Routine arguments == C myThid - Instance number for this innvocation of CALC_MOM_RHS INTEGER bi,bj,k,hDivScheme _RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) _RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) _RL hDiv(1-OLx:sNx+OLx,1-OLy:sNy+OLy) INTEGER myThid C == Local variables == INTEGER i,j IF (hDivScheme.EQ.1) THEN DO j=1-OLy,sNy+OLy-1 DO i=1-OLx,sNx+OLx-1 C This discretization is the straight forward horizontal divergence C that only considers the horizontal grid variations. hDiv(i,j)=( & uFld(i+1, j )*dyG(i+1, j ,bi,bj) & -uFld( i , j )*dyG( i , j ,bi,bj) & +vFld( i ,j+1)*dxG( i ,j+1,bi,bj) & -vFld( i , j )*dxG( i , j ,bi,bj) & )*recip_rA(i,j,bi,bj)*recip_deepFacC(k) #ifdef ALLOW_OBCS & *maskInC(i,j,bi,bj) #endif ENDDO ENDDO ELSEIF (hDivScheme.EQ.2) THEN DO j=1-OLy,sNy+OLy-1 DO i=1-OLx,sNx+OLx-1 C This discretization takes into account the fractional areas C due to the lopping. Whether we should do this is not clear! hDiv(i,j)= & ( ( uFld(i+1, j )*dyG(i+1, j ,bi,bj)*hFacW(i+1, j ,k,bi,bj) & -uFld( i , j )*dyG( i , j ,bi,bj)*hFacW( i , j ,k,bi,bj) ) & +( vFld( i ,j+1)*dxG( i ,j+1,bi,bj)*hFacS( i ,j+1,k,bi,bj) & -vFld( i , j )*dxG( i , j ,bi,bj)*hFacS( i , j ,k,bi,bj) ) & )*recip_rA(i,j,bi,bj)*recip_deepFacC(k) & *_recip_hFacC(i,j,k,bi,bj) #ifdef ALLOW_OBCS & *maskInC(i,j,bi,bj) #endif ENDDO ENDDO ELSE STOP 'S/R MOM_CALC_HDIV: We should never reach this point!' ENDIF RETURN END