C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_y.F,v 1.4 2006/12/05 05:26:46 jmc Exp $ C $Name: $ #include "GAD_OPTIONS.h" CBOP C !ROUTINE: GAD_DIFF_Y C !INTERFACE: ========================================================== SUBROUTINE GAD_DIFF_Y( I bi,bj,k, I yA, diffKh, I tracer, O dfy, I myThid ) C !DESCRIPTION: C Calculates the area integrated meridional flux due to down-gradient C diffusion of a tracer: C \begin{equation*} C F^y_{diff} = - A^y \kappa_h \frac{1}{\Delta y_c} \delta_j \theta C \end{equation*} C !USES: =============================================================== IMPLICIT NONE #include "SIZE.h" #include "GRID.h" C !INPUT PARAMETERS: =================================================== C bi,bj :: tile indices C k :: vertical level C yA :: area of face at V points C diffKh :: horizontal diffusivity C tracer :: tracer field C myThid :: thread number INTEGER bi,bj,k _RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) _RL diffKh _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) INTEGER myThid C !OUTPUT PARAMETERS: ================================================== C dfx :: meridional diffusive flux _RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) C !LOCAL VARIABLES: ==================================================== C i,j :: loop indices INTEGER i,j CEOP DO i=1-Olx,sNx+Olx dfy(i,1-Oly)=0. ENDDO DO j=1-Oly+1,sNy+Oly DO i=1-Olx,sNx+Olx dfy(i,j) = -diffKh*yA(i,j) & *_recip_dyC(i,j,bi,bj)*recip_deepFacC(k) & *(tracer(i,j)-tracer(i,j-1)) #ifdef ISOTROPIC_COS_SCALING & *cosFacV(j,bi,bj) #endif ENDDO ENDDO RETURN END