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jmc |
1.3 |
C $Header: /u/gcmpack/MITgcm/model/src/calc_oce_mxlayer.F,v 1.2 2007/06/20 23:06:51 jmc Exp $ |
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jmc |
1.1 |
C $Name: $ |
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: CALC_OCE_MXLAYER |
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C !INTERFACE: |
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SUBROUTINE CALC_OCE_MXLAYER( |
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I rhoSurf, sigmaR, |
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I bi, bj, myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R CALC_OCE_MXLAYER |
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C | o Diagnose the Oceanic surface Mixed-Layer |
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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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#include "DYNVARS.h" |
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#ifdef ALLOW_GMREDI |
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# include "GMREDI.h" |
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#endif |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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C rhoSurf :: Surface density anomaly |
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C sigmaR :: Vertical gradient of potential density |
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C bi,bj :: tile indices |
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C myTime :: Current time in simulation |
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C myIter :: Current iteration number in simulation |
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C myThid :: my Thread Id number |
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_RL rhoSurf(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL sigmaR (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER bi, bj |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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C === Functions ==== |
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#ifdef ALLOW_DIAGNOSTICS |
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LOGICAL DIAGNOSTICS_IS_ON |
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EXTERNAL DIAGNOSTICS_IS_ON |
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#endif /* ALLOW_DIAGNOSTICS */ |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j :: Loop counters |
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INTEGER i,j,k |
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LOGICAL calcMixLayerDepth |
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INTEGER method |
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_RL dRhoSmall, rhoBigNb |
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_RL rhoMxL(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL rhoKm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL rhoLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL tmpFac, sigmAv |
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CEOP |
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calcMixLayerDepth = .FALSE. |
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#ifdef ALLOW_GMREDI |
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IF ( useGMRedi ) calcMixLayerDepth = GM_taper_scheme.EQ.'fm07' |
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#endif |
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics.AND. .NOT.calcMixLayerDepth ) THEN |
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calcMixLayerDepth = DIAGNOSTICS_IS_ON('MXLDEPTH',myThid) |
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ENDIF |
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#endif |
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IF ( calcMixLayerDepth ) THEN |
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C-- Select which "method" to use: |
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method = 0 |
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IF ( hMixCriteria.LT.0. ) method = 1 |
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IF ( hMixCriteria.GT.1. ) method = 2 |
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IF ( method.EQ.1 ) THEN |
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C-- First method : |
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C where the potential density (ref.lev=surface) is larger than |
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C surface density plus Delta_Rho = hMixCriteria * Alpha(surf) |
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C = density of water which is -hMixCriteria colder than surface water |
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c hMixCriteria = -0.8 _d 0 |
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dRhoSmall = 1. _d -6 |
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rhoBigNb = rhoConst*1. _d 10 |
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CALL FIND_ALPHA( |
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I bi, bj, 1-OLx, sNx+OLx, 1-OLy, sNy+OLy, 1, 1, |
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O rhoMxL, 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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rhoKm1(i,j) = rhoSurf(i,j) |
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rhoMxL(i,j) = rhoSurf(i,j) |
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& + MAX( rhoMxL(i,j)*hMixCriteria, dRhoSmall ) |
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jmc |
1.3 |
hMixLayer(i,j,bi,bj) = rF(1)-R_low(i,j,bi,bj) |
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jmc |
1.1 |
ENDDO |
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ENDDO |
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DO k = 2,Nr |
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C- potential density (reference level = surface level) |
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jmc |
1.3 |
CALL FIND_RHO_2D( |
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I 1-OLx, sNx+OLx, 1-OLy, sNy+OLy, 1, |
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I theta(1-OLx,1-OLy,k,bi,bj), salt(1-OLx,1-OLy,k,bi,bj), |
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O rhoLoc, |
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I k, bi, bj, myThid ) |
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jmc |
1.1 |
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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 ( k.LE.klowC(i,j,bi,bj) .AND. |
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& rhoLoc(i,j).GE.rhoMxL(i,j) ) THEN |
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IF ( rhoLoc(i,j).GT.rhoKm1(i,j) ) THEN |
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tmpFac = ( rhoMxL(i,j) - rhoKm1(i,j) ) |
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& / ( rhoLoc(i,j) - rhoKm1(i,j) ) |
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ELSE |
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tmpFac = 0. |
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ENDIF |
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hMixLayer(i,j,bi,bj) = rF(1)-rC(k-1)+tmpFac*drC(k) |
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rhoMxL(i,j) = rhoBigNb |
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ELSE |
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rhoKm1(i,j) = rhoLoc(i,j) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ELSEIF ( method.EQ.2 ) THEN |
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C-- Second method : |
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C where the local stratification exceed the mean stratification above |
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C (from surface down to here) by factor hMixCriteria |
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c hMixCriteria = 2. _d 0 |
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jmc |
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C-Note: dRhoSmall is hard coded for now but should become run-time parameter |
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jmc |
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dRhoSmall = 1. _d -2 |
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jmc |
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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 ( klowC(i,j,bi,bj) .GT. 0 ) THEN |
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hMixLayer(i,j,bi,bj) = drF(1) |
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rhoMxL(i,j) = 1. |
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ELSE |
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hMixLayer(i,j,bi,bj) = rF(1) |
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rhoMxL(i,j) = -1. |
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ENDIF |
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ENDDO |
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ENDDO |
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jmc |
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DO k = 2,Nr-1 |
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jmc |
1.1 |
C- potential density (reference level = surface level) |
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jmc |
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CALL FIND_RHO_2D( |
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I 1-OLx, sNx+OLx, 1-OLy, sNy+OLy, 1, |
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I theta(1-OLx,1-OLy,k,bi,bj), salt(1-OLx,1-OLy,k,bi,bj), |
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O rhoLoc, |
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I k, bi, bj, myThid ) |
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jmc |
1.1 |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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jmc |
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IF ( k.LT.klowC(i,j,bi,bj) |
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jmc |
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& .AND. rhoMxL(i,j).GE.0. ) THEN |
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jmc |
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sigmAv = ( rhoLoc(i,j)-rhoSurf(i,j)+dRhoSmall ) |
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& / ( rC(1)-rC(k) ) |
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IF ( -sigmaR(i,j,k+1).GT.sigmAv*hMixCriteria ) THEN |
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tmpFac = 0. _d 0 |
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IF ( sigmAv.GT.0. _d 0 ) THEN |
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jmc |
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tmpFac = hMixCriteria*sigmaR(i,j,k)/sigmaR(i,j,k+1) |
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IF ( tmpFac .GT. 1. _d 0 ) THEN |
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tmpFac = 1. _d 0 |
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& + ( tmpFac - 1. _d 0 )/( hMixCriteria - 1. _d 0 ) |
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ENDIF |
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tmpFac = MAX( 0. _d 0, MIN( tmpFac, 2. _d 0 ) ) |
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jmc |
1.1 |
ENDIF |
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jmc |
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hMixLayer(i,j,bi,bj) = rF(1)-rF(k+1) |
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& - drF(k)*tmpFac*0.5 _d 0 |
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rhoMxL(i,j) = -1. |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ELSE |
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STOP 'S/R CALC_OCE_MXLAYER: invalid method' |
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ENDIF |
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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CALL DIAGNOSTICS_FILL( hMixLayer, 'MXLDEPTH', |
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& 0, 1, 1, bi, bj, myThid ) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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C-- end if calcMixLayerDepth |
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ENDIF |
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RETURN |
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END |
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