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mlosch |
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C $Header: /u/gcmpack/MITgcm/pkg/shelfice/shelfice_update_masks.F,v 1.2 2008/09/12 14:07:02 jmc Exp $ |
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mlosch |
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C $Name: $ |
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#include "SHELFICE_OPTIONS.h" |
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CBOP |
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C !ROUTINE: SHELFICE_UPDATE_MASKS |
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C !INTERFACE: |
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jmc |
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SUBROUTINE SHELFICE_UPDATE_MASKS( |
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mlosch |
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I rF, recip_drF, |
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jmc |
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U hFacC, |
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mlosch |
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I myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SHELFICE_UPDATE_MASKS |
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C | o modify topography factor hFacC according to ice shelf |
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C | topography |
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C *==========================================================* |
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C \ev |
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C !USES: |
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IMPLICIT NONE |
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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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#ifdef ALLOW_SHELFICE |
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# include "SHELFICE.h" |
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#endif /* ALLOW_SHELFICE */ |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C rF :: R-coordinate of face of cell (units of r). |
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C recip_drF :: Recipricol of cell face separation along Z axis ( units of r ). |
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C hFacC :: Fraction of cell in vertical which is open (see GRID.h) |
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C myThid :: Number of this instance of SHELFICE_UPDATE_MASKS |
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_RS rF (1:Nr+1) |
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_RS recip_drF (1:Nr) |
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_RS hFacC (1-OLx:sNx+OLx,1-OLy:sNy+OLy,1:Nr,nSx,nSy) |
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INTEGER myThid |
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#ifdef ALLOW_SHELFICE |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C bi,bj :: tile indices |
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C I,J,K :: Loop counters |
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INTEGER bi, bj |
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INTEGER I, J, K |
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_RL hFacCtmp |
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_RL hFacMnSz |
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CEOP |
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C initialize R_shelfIce |
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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 j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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R_shelfIce(i,j,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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IF ( SHELFICEtopoFile .NE. ' ' ) THEN |
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_BARRIER |
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C Read the shelfIce draught using the mid-level I/O pacakage read_write_rec |
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C The 0 is the "iteration" argument. The 1 is the record number. |
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CALL READ_REC_XY_RS( SHELFICEtopoFile, R_shelfIce, |
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& 1, 0, myThid ) |
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C Read the shelfIce draught using the mid-level I/O pacakage read_write_fld |
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C The 0 is the "iteration" argument. The ' ' is an empty suffix |
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C CALL READ_FLD_XY_RS( SHELFICEtopoFile, ' ', R_shelfIce, |
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C & 0, myThid ) |
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ENDIF |
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C- end setup R_shelfIce in the interior |
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C- fill in the overlap (+ BARRIER): |
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_EXCH_XY_R4(R_shelfIce, myThid ) |
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C-- Calculate lopping factor hFacC : Remove part outside of the domain |
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C taking into account the Reference (=at rest) Surface Position Ro_shelfIce |
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DO bj=myByLo(myThid), myByHi(myThid) |
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DO bi=myBxLo(myThid), myBxHi(myThid) |
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C-- compute contributions of shelf ice to looping factors |
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DO K=1, Nr |
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hFacMnSz=max( hFacMin, min(hFacMinDr*recip_drF(k),1. _d 0) ) |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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C o Non-dimensional distance between grid boundary and model surface |
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hFacCtmp = (rF(k)-R_shelfIce(I,J,bi,bj))*recip_drF(K) |
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C o Reduce the previous fraction : substract the outside part. |
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hFacCtmp = hFacC(I,J,K,bi,bj) - max( hFacCtmp, 0. _d 0) |
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C o set to zero if empty Column : |
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hFacCtmp = max( hFacCtmp, 0. _d 0) |
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C o Impose minimum fraction and/or size (dimensional) |
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IF (hFacCtmp.LT.hFacMnSz) THEN |
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IF (hFacCtmp.LT.hFacMnSz*0.5) THEN |
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hFacC(I,J,K,bi,bj)=0. |
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ELSE |
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hFacC(I,J,K,bi,bj)=hFacMnSz |
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ENDIF |
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ELSE |
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hFacC(I,J,K,bi,bj)=hFacCtmp |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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C - end bi,bj loops. |
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ENDDO |
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ENDDO |
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#endif /* ALLOW_SHELFICE */ |
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RETURN |
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END |
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