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gad_del2.F
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gad_del2.F
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#include "GAD_OPTIONS.h"
CBOP
C !ROUTINE: GAD_DEL2
C !INTERFACE: ==========================================================
SUBROUTINE GAD_DEL2(
I bi,bj,k,
I dTdx,dTdy,
O del2,
I myThid )
C !DESCRIPTION:
C Calculates the horizontal Laplacian of a tracer:
C \begin{equation*}
C \nabla^2 \theta = \partial_{xx} \theta + \partial_{yy} \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 dTx :: zonal tracer gradient
C dTy :: meridional tracer gradient
C myThid :: thread number
INTEGER bi,bj,k
_RL dTdx(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL dTdy(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
INTEGER myThid
C !OUTPUT PARAMETERS: ==================================================
C del2 :: Laplacian of tracer
_RL del2(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
C !LOCAL VARIABLES: ====================================================
C i,j :: loop indices
INTEGER i,j
CEOP
C-- Initialise to zero.
DO j=1-Oly,sNy+Oly
DO i=1-Olx,sNx+Olx
del2(i,j)= 0. _d 0
ENDDO
ENDDO
C Difference of zonal fluxes & meridional fluxes
C and divide by grid-cell volume
DO j=1-Oly,sNy+Oly-1
DO i=1-Olx,sNx+Olx-1
del2(i,j)=recip_rA(i,j,bi,bj)*recip_deepFac2C(k)
& *recip_drF(k)*_recip_hFacC(i,j,k,bi,bj)
& *( ( dTdx(i+1,j)-dTdx(i,j) )
& +( dTdy(i,j+1)-dTdy(i,j) )
& )
ENDDO
ENDDO
RETURN
END