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jmc |
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C $Header: /u/gcmpack/MITgcm/model/src/ini_masks_etc.F,v 1.45 2010/01/16 23:00:16 jmc Exp $ |
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C $Name: $ |
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c#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: INI_SIGMA_HFAC |
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C !INTERFACE: |
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SUBROUTINE INI_SIGMA_HFAC( myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE INI_SIGMA_HFAC |
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C | o Initialise grid factors when using Sigma coordiante |
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C *==========================================================* |
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C | These arrays are used throughout the code and describe |
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C | fractional height factors. |
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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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#include "GRID.h" |
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#include "SURFACE.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C myThid :: Number of this instance of INI_SIGMA_HFAC |
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INTEGER myThid |
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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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C rEmpty :: empty column r-position |
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C rFullDepth :: maximum depth of a full column |
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C tmpFld :: Temporary array used to compute & write Total Depth |
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C min_hFac :: actual minimum of cell-centered hFac |
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C msgBuf :: Informational/error message buffer |
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INTEGER bi, bj |
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INTEGER i, j, k |
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_RS rEmpty |
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_RL rFullDepth |
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_RL tmpFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL min_hFac |
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_RL hFactmp |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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CEOP |
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C r(ij,k,t) = rLow(ij) + aHybSigm(k)*[rF(1)-rF(Nr+1)] |
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C + bHybSigm(k)*[eta(ij,t)+Ro_surf(ij) - rLow(ij)] |
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IF ( usingPCoords ) rEmpty = rF(Nr+1) |
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IF ( usingZCoords ) rEmpty = rF(1) |
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rFullDepth = rF(1)-rF(Nr+1) |
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C--- Calculate partial-cell factor hFacC : |
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min_hFac = 1. |
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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- Remove column (mask=0) thinner than hFacMin*rFullDepth |
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C ensures hFac > hFacMin (assuming we use pure Sigma) |
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C Note: because of unfortunate hFacMin default value (=1) (would produce |
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C unexpected empty column), for now, use hFacInf instead of hFacMin |
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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) = Ro_surf(i,j,bi,bj)-R_low(i,j,bi,bj) |
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c IF ( tmpFld(i,j).LT.hFacMin*rFullDepth ) |
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IF ( tmpFld(i,j).LT.hFacInf*rFullDepth ) |
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& tmpFld(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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c#ifdef ALLOW_SHELFICE |
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C-- Would need a specific call here similar to SHELFICE_UPDATE_MASKS |
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c IF ( useShelfIce ) THEN |
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c ENDIF |
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c#endif /* ALLOW_SHELFICE */ |
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C- Set (or reset) other 2-D cell-centered fields |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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IF ( tmpFld(i,j).GT.0. _d 0 ) THEN |
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kSurfC (i,j,bi,bj) = 1 |
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kLowC (i,j,bi,bj) = Nr |
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maskInC(i,j,bi,bj) = 1. |
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recip_Rcol(i,j,bi,bj) = 1. _d 0 / tmpFld(i,j) |
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ELSE |
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kSurfC (i,j,bi,bj) = Nr+1 |
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kLowC (i,j,bi,bj) = 0 |
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maskInC(i,j,bi,bj) = 0. |
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recip_Rcol(i,j,bi,bj) = 0. _d 0 |
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Ro_surf(i,j,bi,bj) = rEmpty |
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R_low(i,j,bi,bj) = rEmpty |
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ENDIF |
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ENDDO |
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ENDDO |
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C- Set 3-D hFacC |
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DO k=1, Nr |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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IF ( maskInC(i,j,bi,bj).NE.0. _d 0 ) THEN |
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hFactmp = ( dAHybSigF(k)*rFullDepth |
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& + dBHybSigF(k)*tmpFld(i,j) |
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& )*recip_drF(k) |
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hFacC(i,j,k,bi,bj) = hFactmp |
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min_hFac = MIN( min_hFac, hFactmp ) |
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ELSE |
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hFacC(i,j,k,bi,bj) = 0. |
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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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WRITE(msgBuf,'(A,1PE14.6)') |
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& 'S/R INI_SIGMA_HFAC: minimum hFacC=', min_hFac |
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CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
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& SQUEEZE_RIGHT, myThid ) |
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c CALL PLOT_FIELD_XYRS(R_low, |
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c & 'Model R_low (ini_masks_etc)', 1, myThid) |
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c CALL PLOT_FIELD_XYRS(Ro_surf, |
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c & 'Model Ro_surf (ini_masks_etc)', 1, myThid) |
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C-- Set Western & Southern fields (at U and V points) |
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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- set 2-D mask and rLow & reference rSurf at Western & Southern edges |
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i = 1-OlX |
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DO j=1-Oly,sNy+Oly |
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rSurfW(i,j,bi,bj) = rEmpty |
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rLowW (i,j,bi,bj) = rEmpty |
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maskInW(i,j,bi,bj)= 0. |
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ENDDO |
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j = 1-Oly |
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DO i=1-Olx,sNx+Olx |
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rSurfS(i,j,bi,bj) = rEmpty |
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rLowS (i,j,bi,bj) = rEmpty |
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maskInS(i,j,bi,bj)= 0. |
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ENDDO |
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DO j=1-Oly,sNy+Oly |
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DO i=2-Olx,sNx+Olx |
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maskInW(i,j,bi,bj)= maskInC(i-1,j,bi,bj)*maskInC(i,j,bi,bj) |
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rSurfW(i,j,bi,bj) = |
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& ( Ro_surf(i-1,j,bi,bj) |
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& + Ro_surf( i, j,bi,bj) )*0.5 _d 0 |
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rLowW(i,j,bi,bj) = |
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& ( R_low(i-1,j,bi,bj) |
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& + R_low( i, j,bi,bj) )*0.5 _d 0 |
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c rSurfW(i,j,bi,bj) = |
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c & ( Ro_surf(i-1,j,bi,bj)*rA(i-1,j,bi,bj) |
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c & + Ro_surf( i, j,bi,bj)*rA( i, j,bi,bj) |
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c & )*recip_rAw(i,j,bi,bj)*0.5 _d 0 |
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c rLowW(i,j,bi,bj) = |
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c & ( R_low(i-1,j,bi,bj)*rA(i-1,j,bi,bj) |
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c & + R_low( i, j,bi,bj)*rA( i, j,bi,bj) |
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c & )*recip_rAw(i,j,bi,bj)*0.5 _d 0 |
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IF ( maskInW(i,j,bi,bj).EQ.0. ) THEN |
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rSurfW(i,j,bi,bj) = rEmpty |
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rLowW (i,j,bi,bj) = rEmpty |
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ENDIF |
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ENDDO |
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ENDDO |
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DO j=2-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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maskInS(i,j,bi,bj)= maskInC(i,j-1,bi,bj)*maskInC(i,j,bi,bj) |
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rSurfS(i,j,bi,bj) = |
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& ( Ro_surf(i,j-1,bi,bj) |
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& + Ro_surf(i, j, bi,bj) )*0.5 _d 0 |
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rLowS(i,j,bi,bj) = |
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& ( R_low(i,j-1,bi,bj) |
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& + R_low(i, j, bi,bj) )*0.5 _d 0 |
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c rSurfS(i,j,bi,bj) = |
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c & ( Ro_surf(i,j-1,bi,bj)*rA(i,j-1,bi,bj) |
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c & + Ro_surf(i, j, bi,bj)*rA(i, j, bi,bj) |
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c & )*recip_rAs(i,j,bi,bj)*0.5 _d 0 |
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c rLowS(i,j,bi,bj) = |
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c & ( R_low(i,j-1,bi,bj)*rA(i,j-1,bi,bj) |
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c & + R_low(i, j, bi,bj)*rA(i, j, bi,bj) |
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c & )*recip_rAs(i,j,bi,bj)*0.5 _d 0 |
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IF ( maskInS(i,j,bi,bj).EQ.0. ) THEN |
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rSurfS(i,j,bi,bj) = rEmpty |
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rLowS (i,j,bi,bj) = rEmpty |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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CALL EXCH_UV_XY_RS( rSurfW, rSurfS, .FALSE., myThid ) |
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CALL EXCH_UV_XY_RS( rLowW, rLowS, .FALSE., myThid ) |
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CALL EXCH_UV_XY_RS( maskInW, maskInS, .FALSE., myThid ) |
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C-- The following block allows thin walls representation of non-periodic |
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C boundaries such as happen on the lat-lon grid at the N/S poles. |
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C We should really supply a flag for doing this. |
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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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IF (dyG(i,j,bi,bj).EQ.0.) maskInW(i,j,bi,bj) = 0. |
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IF (dxG(i,j,bi,bj).EQ.0.) maskInS(i,j,bi,bj) = 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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C- Set hFacW and hFacS (at U and V points) |
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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, Nr |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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hFactmp = |
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& ( dAHybSigF(k)*rFullDepth |
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& + dBHybSigF(k)*( rSurfW(i,j,bi,bj)-rLowW(i,j,bi,bj) ) |
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& )*recip_drF(k) |
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hFacW(i,j,k,bi,bj) = hFactmp*maskInW(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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DO k=1, Nr |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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hFactmp = |
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& ( dAHybSigF(k)*rFullDepth |
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& + dBHybSigF(k)*( rSurfS(i,j,bi,bj)-rLowS(i,j,bi,bj) ) |
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& )*recip_drF(k) |
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hFacS(i,j,k,bi,bj) = hFactmp*maskInS(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C- Set surface k index for interface W & S (U & V points) |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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kSurfW(i,j,bi,bj) = Nr+1 |
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kSurfS(i,j,bi,bj) = Nr+1 |
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IF ( maskInW(i,j,bi,bj).NE.0. ) kSurfW(i,j,bi,bj) = 1 |
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IF ( maskInS(i,j,bi,bj).NE.0. ) kSurfS(i,j,bi,bj) = 1 |
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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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RETURN |
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END |
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