C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_calc_tension.F,v 1.5 2015/09/10 17:53:04 jmc Exp $ C $Name: $ #include "MOM_COMMON_OPTIONS.h" CBOP C !ROUTINE: MOM_CALC_TENSION C !INTERFACE: ========================================================== SUBROUTINE MOM_CALC_TENSION( I bi,bj,k, I uFld, vFld, O tension, I myThid ) C !DESCRIPTION: C Calculates the tension of the horizontal flow field (at tracer points): C \begin{equation*} C D_T = \frac{\Delta y_f}{\Delta x_f} \delta_i \frac{u}{\Delta y_g} C - \frac{\Delta x_f}{\Delta y_f} \delta_j \frac{v}{\Delta x_g} C \end{equation*} C !USES: =============================================================== IMPLICIT NONE #include "SIZE.h" #include "EEPARAMS.h" #include "PARAMS.h" #include "GRID.h" C !INPUT PARAMETERS: =================================================== C bi,bj :: tile indices C k :: vertical level C uFld :: zonal flow C vFld :: meridional flow C myThid :: thread number INTEGER bi,bj,k _RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) _RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) INTEGER myThid C !OUTPUT PARAMETERS: ================================================== C tension :: tension of horizontal flow _RL tension(1-OLx:sNx+OLx,1-OLy:sNy+OLy) C !LOCAL VARIABLES: ==================================================== C i,j :: loop indices INTEGER i,j CEOP DO j=1-OLy,sNy+OLy-1 DO i=1-OLx,sNx+OLx-1 C Calculate tension of horizontal flow (ignoring lopping factors) C *NOTE* that masking is implicit in the contents of the (u,v) fields. tension(i,j)= & ( dyG(i+1, j ,bi,bj)*uFld(i+1, j ) & -dyG( i , j ,bi,bj)*uFld( i , j ) & -dxG( i ,j+1,bi,bj)*vFld( i ,j+1) & +dxG( i , j ,bi,bj)*vFld( i , j ) & )*recip_rA(i,j,bi,bj)*recip_deepFacC(k) #ifdef ALLOW_OBCS & *maskInC(i,j,bi,bj) #endif c tension(i,j)= c & (dyF(i,j,bi,bj)*recip_dxF(i,j,bi,bj)) c & *( uFld(i+1, j )*recip_dyG(i+1, j ,bi,bj) c & -uFld( i , j )*recip_dyG( i , j ,bi,bj) ) c & -(dxF(i,j,bi,bj)*recip_dyF(i,j,bi,bj)) c & *( vFld( i ,j+1)*recip_dxG( i ,j+1,bi,bj) c & -vFld( i , j )*recip_dxG( i , j ,bi,bj) ) ENDDO ENDDO RETURN END