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shap_filt_tracer_s2.F
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shap_filt_tracer_s2.F
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C $Header: /u/gcmpack/MITgcm/pkg/shap_filt/shap_filt_tracer_s2.F,v 1.3 2001/06/15 15:14:56 jmc Exp $
C $Name: $
#include "SHAP_FILT_OPTIONS.h"
SUBROUTINE SHAP_FILT_TRACER_S2(
U field,
I myTime, myThid )
C /==========================================================\
C | S/R SHAP_FILT_TRACER_S2 |
C | Applies Shapiro filter to tracer field over one XY slice |
C | of one tile at a time. |
C \==========================================================/
IMPLICIT NONE
C == Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"
#include "SHAP_FILT.h"
#include "SHAP_FILT_TRACER.h"
C == Routine arguments
_RL field(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
_RL myTime
INTEGER myThid
#ifdef ALLOW_SHAP_FILT
C == Local variables ==
INTEGER nShapComput
INTEGER bi,bj,K,I,J,N
_RL tmpGrd(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
IF (nShapT.GT.0) THEN
C-------
C Apply computational filter ^(nShap-nShapPhys) without grid factor
C then apply Physical filter ^nShapPhys with grid factors
C-------
nShapComput = nShapT - nShapTrPhys
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO K=1,Nr
DO J=1-Oly,sNy+Oly
DO I=1-Olx,sNx+Olx
tmpFld(i,j,k,bi,bj)=field(i,j,k,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
ENDDO
C ( d_xx +d_yy )^n tmpFld
C-- Computational Filter
DO N=1,nShapComput
_EXCH_XYZ_R8( tmpFld, myThid )
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO K=1,Nr
DO J=1,sNy
DO I=1,sNx
tmpGrd(i,j) =
& ( tmpFld(i+1,j,k,bi,bj)-tmpFld( i ,j,k,bi,bj) )
& *_maskW(i+1,j,k,bi,bj)
& -( tmpFld( i ,j,k,bi,bj)-tmpFld(i-1,j,k,bi,bj) )
& *_maskW( i ,j,k,bi,bj)
& +( tmpFld(i,j+1,k,bi,bj)-tmpFld(i, j ,k,bi,bj) )
& *_maskS(i,j+1,k,bi,bj)
& -( tmpFld(i, j ,k,bi,bj)-tmpFld(i,j-1,k,bi,bj) )
& *_maskS(i, j ,k,bi,bj)
ENDDO
ENDDO
DO J=1,sNy
DO I=1,sNx
tmpFld(i,j,k,bi,bj) = -0.125*tmpGrd(i,j)
ENDDO
ENDDO
ENDDO
ENDDO
ENDDO
C end loop N=1,nShapComput
ENDDO
DO N=1,nShapTrPhys
C-- Physical space Filter
_EXCH_XYZ_R8( tmpFld, myThid )
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO K=1,Nr
DO J=1,sNy
DO I=1,sNx
tmpGrd(i,j) =
& ( tmpFld(i+1,j,k,bi,bj)-tmpFld( i ,j,k,bi,bj) )
& *_hFacW(i+1,j,k,bi,bj)
& *DYG(i+1,j,bi,bj)
& *recip_DXC(i+1,j,bi,bj)
& -( tmpFld( i ,j,k,bi,bj)-tmpFld(i-1,j,k,bi,bj) )
& *_hFacW( i ,j,k,bi,bj)
& *DYG( i ,j,bi,bj)
& *recip_DXC( i ,j,bi,bj)
& +( tmpFld(i,j+1,k,bi,bj)-tmpFld(i, j ,k,bi,bj) )
& *_hFacS(i,j+1,k,bi,bj)
& *DXG(i,j+1,bi,bj)
& *recip_DYC(i,j+1,bi,bj)
& -( tmpFld(i, j ,k,bi,bj)-tmpFld(i,j-1,k,bi,bj) )
& *_hFacS(i, j ,k,bi,bj)
& *DXG(i, j ,bi,bj)
& *recip_DYC(i, j ,bi,bj)
ENDDO
ENDDO
IF (Shap_TrLength.EQ.0.) THEN
DO J=1,sNy
DO I=1,sNx
tmpFld(i,j,k,bi,bj) = -0.125*tmpGrd(i,j)
& *recip_hFacC(i,j,k,bi,bj)
ENDDO
ENDDO
ELSE
DO J=1,sNy
DO I=1,sNx
tmpFld(i,j,k,bi,bj) = -0.125*tmpGrd(i,j)
& *recip_hFacC(i,j,k,bi,bj)*recip_rA(i,j,bi,bj)
& *Shap_TrLength*Shap_TrLength
ENDDO
ENDDO
ENDIF
ENDDO
ENDDO
ENDDO
C end loop N=1,nShapTrPhys
ENDDO
C F <- [1-(d_xx+d_yy)^n]F
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO K=1,Nr
DO J=1,sNy
DO I=1,sNx
field(i,j,k,bi,bj)=field(i,j,k,bi,bj)
& -tmpFld(i,j,k,bi,bj)*deltaTtracer/Shap_Trtau
ENDDO
ENDDO
ENDDO
ENDDO
ENDDO
_EXCH_XYZ_R8( field, myThid )
ENDIF
#endif /* ALLOW_SHAP_FILT */
RETURN
END