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C $Header: /u/gcmpack/MITgcm/pkg/shap_filt/shap_filt_tracer_s4.F,v 1.5 2004/12/04 00:19:12 jmc Exp $ |
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C $Name: $ |
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|
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#include "SHAP_FILT_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SHAP_FILT_TRACER_S4 |
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C !INTERFACE: |
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SUBROUTINE SHAP_FILT_TRACER_S4( |
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U field, tmpFld, |
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I nShapTr, kSize, myTime, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R SHAP_FILT_TRACER_S4 |
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C | o Applies Shapiro filter to tracer field (cell center). |
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C | o use filtering function "S4" = [1 - d_xx^n][1- d_yy^n] |
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C | with no grid spacing (computational Filter) |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "SHAP_FILT.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments |
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C field :: cell-centered 2D field on which filter applies |
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C tmpFld :: working temporary array |
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C nShapTr :: (total) power of the filter for this tracer |
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C kSize :: length of 3rd Dim : either =1 (2D field) or =Nr (3D field) |
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C myTime :: Current time in simulation |
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C myThid :: Thread number for this instance of SHAP_FILT_TRACER_S4 |
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INTEGER nShapTr, kSize |
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_RL field(1-OLx:sNx+OLx,1-OLy:sNy+OLy,kSize,nSx,nSy) |
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_RL tmpFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,kSize,nSx,nSy) |
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_RL myTime |
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INTEGER myThid |
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|
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#ifdef ALLOW_SHAP_FILT |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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INTEGER bi,bj,K,I,J,N |
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_RL tmpGrd(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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CEOP |
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|
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IF (nShapTr.gt.0) THEN |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K=1,kSize |
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DO J=1-OLy,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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tmpFld(i,j,k,bi,bj)=field(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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|
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C d_xx^n tmpFld |
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|
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DO N=1,nShapTr |
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|
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IF (kSize.EQ.Nr) THEN |
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_EXCH_XYZ_RL( tmpFld, myThid ) |
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ELSE |
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_EXCH_XY_RL( tmpFld, myThid ) |
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ENDIF |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K=1,kSize |
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|
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DO J=1,sNy |
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DO I=1,sNx |
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tmpGrd(i,j) = -0.25*( |
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& ( tmpFld(i+1,j,k,bi,bj)-tmpFld( i ,j,k,bi,bj) ) |
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& *_maskW(i+1,j,k,bi,bj) |
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& -( tmpFld( i ,j,k,bi,bj)-tmpFld(i-1,j,k,bi,bj) ) |
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& *_maskW(i,j,k,bi,bj) ) |
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ENDDO |
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ENDDO |
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|
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DO J=1,sNy |
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DO I=1,sNx |
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tmpFld(i,j,k,bi,bj) = tmpGrd(i,j) |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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|
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C F <- [1 - d_xx^n *deltaT/tau].F |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K=1,kSize |
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DO J=1,sNy |
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DO I=1,sNx |
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field(i,j,k,bi,bj)=field(i,j,k,bi,bj) |
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& -tmpFld(i,j,k,bi,bj)*dTtracerLev(1)/Shap_Trtau |
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tmpFld(i,j,k,bi,bj)=field(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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|
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C d_yy^n tmpFld |
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|
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DO N=1,nShapTr |
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|
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IF (kSize.EQ.1) THEN |
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_EXCH_XY_RL( tmpFld, myThid ) |
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ELSE |
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_EXCH_XYZ_RL( tmpFld, myThid ) |
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ENDIF |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K=1,kSize |
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|
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DO J=1,sNy |
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DO I=1,sNx |
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tmpGrd(i,j) = -0.25*( |
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& ( tmpFld(i,j+1,k,bi,bj)-tmpFld(i, j ,k,bi,bj) ) |
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& *_maskS(i,j+1,k,bi,bj) |
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& -( tmpFld(i, j ,k,bi,bj)-tmpFld(i,j-1,k,bi,bj) ) |
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& *_maskS(i,j,k,bi,bj) ) |
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ENDDO |
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ENDDO |
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|
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DO J=1,sNy |
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DO I=1,sNx |
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tmpFld(i,j,k,bi,bj) = tmpGrd(i,j) |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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|
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C F <- [1 - d_yy^n *deltaT/tau].F |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO K=1,kSize |
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DO J=1,sNy |
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DO I=1,sNx |
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field(i,j,k,bi,bj)=field(i,j,k,bi,bj) |
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& -tmpFld(i,j,k,bi,bj)*dTtracerLev(1)/Shap_Trtau |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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IF (kSize.EQ.Nr) THEN |
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_EXCH_XYZ_RL( field, myThid ) |
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ELSEIF (kSize.EQ.1) THEN |
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_EXCH_XY_RL( field, myThid ) |
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ELSE |
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STOP 'S/R SHAP_FILT_TRACER_S4: kSize is wrong' |
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ENDIF |
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|
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ENDIF |
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#endif /* ALLOW_SHAP_FILT */ |
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|
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RETURN |
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END |
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