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C $Header: /u/gcmpack/MITgcm/model/src/external_forcing_surf.F,v 1.49 2009/12/21 00:24:58 jmc Exp $ |
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C $Name: $ |
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|
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: EXTERNAL_FORCING_SURF |
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C !INTERFACE: |
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SUBROUTINE EXTERNAL_FORCING_SURF( |
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I bi, bj, iMin, iMax, jMin, jMax, |
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I myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE EXTERNAL_FORCING_SURF |
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C | o Determines forcing terms based on external fields |
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C | relaxation terms etc. |
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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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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 "FFIELDS.h" |
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#include "DYNVARS.h" |
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#include "GRID.h" |
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#include "SURFACE.h" |
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#ifdef ALLOW_SEAICE |
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#include "SEAICE_PARAMS.h" |
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#include "SEAICE.h" |
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#endif /* ALLOW_SEAICE */ |
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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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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C bi,bj :: tile indices |
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C iMin,iMax, jMin,jMax :: Range of points for calculation |
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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 :: Thread no. that called this routine. |
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INTEGER bi,bj |
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INTEGER iMin, iMax |
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INTEGER jMin, jMax |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C === Local variables === |
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C i,j :: loop indices |
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C ks :: index of surface interface layer |
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INTEGER i,j |
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INTEGER ks |
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CEOP |
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#ifdef ALLOW_PTRACERS |
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C relaxForcingS :: Salt forcing due to surface relaxation |
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_RL relaxForcingS(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#endif /* ALLOW_PTRACERS */ |
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#ifdef ALLOW_DIAGNOSTICS |
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_RL tmpFac |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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IF ( usingPCoords ) THEN |
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ks = Nr |
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ELSE |
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ks = 1 |
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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IF ( doThetaClimRelax .OR. doSaltClimRelax ) THEN |
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C-- Start with surface restoring term : |
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|
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#ifdef ALLOW_SEAICE |
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IF ( useSEAICE .AND. (.NOT. SEAICErestoreUnderIce) ) THEN |
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C Do not restore under sea-ice |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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C Heat Flux (restoring term) : |
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surfaceForcingT(i,j,bi,bj) = |
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& -lambdaThetaClimRelax(i,j,bi,bj)*(1.-AREA(i,j,bi,bj)) |
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& *(theta(i,j,ks,bi,bj)-SST(i,j,bi,bj)) |
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& *drF(ks)*_hFacC(i,j,ks,bi,bj) |
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C Salt Flux (restoring term) : |
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surfaceForcingS(i,j,bi,bj) = |
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& -lambdaSaltClimRelax(i,j,bi,bj) *(1.-AREA(i,j,bi,bj)) |
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& *(salt(i,j,ks,bi,bj)-SSS(i,j,bi,bj)) |
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& *drF(ks)*_hFacC(i,j,ks,bi,bj) |
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ENDDO |
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ENDDO |
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ELSE |
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#endif /* ALLOW_SEAICE */ |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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C Heat Flux (restoring term) : |
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surfaceForcingT(i,j,bi,bj) = |
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& -lambdaThetaClimRelax(i,j,bi,bj) |
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& *(theta(i,j,ks,bi,bj)-SST(i,j,bi,bj)) |
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& *drF(ks)*_hFacC(i,j,ks,bi,bj) |
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C Salt Flux (restoring term) : |
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surfaceForcingS(i,j,bi,bj) = |
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& -lambdaSaltClimRelax(i,j,bi,bj) |
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& *(salt(i,j,ks,bi,bj)-SSS(i,j,bi,bj)) |
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& *drF(ks)*_hFacC(i,j,ks,bi,bj) |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_SEAICE |
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ENDIF |
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#endif /* ALLOW_SEAICE */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#ifdef NONLIN_FRSURF |
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C- T,S surface forcing will be applied (thermodynamics) after the update |
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C of surf.thickness (hFac): account for change in surf.thickness |
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IF (staggerTimeStep.AND.nonlinFreeSurf.GT.0) THEN |
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IF ( select_rStar.GT.0 ) THEN |
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# ifndef DISABLE_RSTAR_CODE |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
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& * rStarExpC(i,j,bi,bj) |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
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& * rStarExpC(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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# endif /* DISABLE_RSTAR_CODE */ |
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ELSE |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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IF (ks.EQ.ksurfC(i,j,bi,bj)) THEN |
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surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
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& *_recip_hFacC(i,j,ks,bi,bj)*hFac_surfC(i,j,bi,bj) |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
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& *_recip_hFacC(i,j,ks,bi,bj)*hFac_surfC(i,j,bi,bj) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDIF |
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ENDIF |
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#endif /* NONLIN_FRSURF */ |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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|
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C tRelax (temperature relaxation [W/m2], positive <-> increasing Theta) |
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tmpFac = HeatCapacity_Cp*rUnit2mass |
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CALL DIAGNOSTICS_SCALE_FILL( |
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& surfaceForcingT(1-OLx,1-OLy,bi,bj),tmpFac,1, |
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& 'TRELAX ',0, 1,2,bi,bj,myThid) |
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|
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C sRelax (salt relaxation [g/m2/s], positive <-> increasing Salt) |
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tmpFac = rUnit2mass |
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CALL DIAGNOSTICS_SCALE_FILL( |
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& surfaceForcingS(1-OLx,1-OLy,bi,bj),tmpFac,1, |
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& 'SRELAX ',0, 1,2,bi,bj,myThid) |
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|
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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ELSE |
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C-- No restoring for T & S : set surfaceForcingT,S to zero : |
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|
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingT(i,j,bi,bj) = 0. _d 0 |
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surfaceForcingS(i,j,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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|
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C-- end restoring / no restoring block. |
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ENDIF |
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|
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#ifdef ALLOW_PTRACERS |
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IF ( usePTRACERS ) THEN |
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C-- save salt forcing due to surface relaxation |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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relaxForcingS(i,j) = surfaceForcingS(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif /* ALLOW_PTRACERS */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C-- Surface Fluxes : |
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|
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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|
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C Zonal wind stress fu: |
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surfaceForcingU(i,j,bi,bj) = |
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& fu(i,j,bi,bj)*mass2rUnit |
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C Meridional wind stress fv: |
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surfaceForcingV(i,j,bi,bj) = |
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& fv(i,j,bi,bj)*mass2rUnit |
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C Net heat flux Qnet: |
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surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
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& - ( Qnet(i,j,bi,bj) |
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#ifdef SHORTWAVE_HEATING |
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& -Qsw(i,j,bi,bj) |
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#endif |
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#ifdef ALLOW_HFLUXM_CONTROL |
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& +Qnetm(i,j,bi,bj) |
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#endif |
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& ) *recip_Cp*mass2rUnit |
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C Net Salt Flux : |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
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& -saltFlux(i,j,bi,bj)*mass2rUnit |
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|
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_SALT_PLUME |
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C saltPlume is the amount of salt rejected by ice while freezing; |
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C it is here subtracted from surfaceForcingS and will be redistributed |
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C to multiple vertical levels later on as per Duffy et al. (GRL 1999) |
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IF ( useSALT_PLUME ) THEN |
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CALL SALT_PLUME_FORCING_SURF( |
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I bi, bj, iMin, iMax, jMin, jMax, |
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I myTime,myIter,myThid ) |
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ENDIF |
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#endif /* ALLOW_SALT_PLUME */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C-- Fresh-water flux |
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|
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C- Apply mask on Fresh-Water flux |
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C (needed for SSH forcing, whether or not exactConserv is used) |
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IF ( useRealFreshWaterFlux ) THEN |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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EmPmR(i,j,bi,bj) = EmPmR(i,j,bi,bj)*maskInC(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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#ifdef EXACT_CONSERV |
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C NB: synchronous time step: PmEpR lag 1 time step behind EmPmR |
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C to stay consitent with volume change (=d/dt etaH). |
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IF ( staggerTimeStep ) THEN |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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PmEpR(i,j,bi,bj) = -EmPmR(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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IF ( (nonlinFreeSurf.GT.0 .OR. usingPCoords) |
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& .AND. useRealFreshWaterFlux ) THEN |
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|
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C-- NonLin_FrSurf and RealFreshWaterFlux : PmEpR effectively changes |
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C the water column height ; temp., salt, (tracer) flux associated |
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C with this input/output of water is added here to the surface tendency. |
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|
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IF (temp_EvPrRn.NE.UNSET_RL) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
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& + PmEpR(i,j,bi,bj) |
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& *( temp_EvPrRn - theta(i,j,ks,bi,bj) ) |
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& *mass2rUnit |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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IF (salt_EvPrRn.NE.UNSET_RL) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
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& + PmEpR(i,j,bi,bj) |
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& *( salt_EvPrRn - salt(i,j,ks,bi,bj) ) |
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& *mass2rUnit |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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ELSE |
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#else /* EXACT_CONSERV */ |
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IF (.TRUE.) THEN |
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#endif /* EXACT_CONSERV */ |
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|
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C-- EmPmR does not really affect the water column height (for tracer budget) |
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C and is converted to a salt tendency. |
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|
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IF (convertFW2Salt .EQ. -1.) THEN |
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C- use local surface tracer field to calculate forcing term: |
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|
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IF (temp_EvPrRn.NE.UNSET_RL) THEN |
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C account for Rain/Evap heat content (temp_EvPrRn) using local SST |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
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& + EmPmR(i,j,bi,bj) |
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& *( theta(i,j,ks,bi,bj) - temp_EvPrRn ) |
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& *mass2rUnit |
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ENDDO |
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ENDDO |
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ENDIF |
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IF (salt_EvPrRn.NE.UNSET_RL) THEN |
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C converts EmPmR to salinity tendency using surface local salinity |
| 308 |
DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
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& + EmPmR(i,j,bi,bj) |
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& *( salt(i,j,ks,bi,bj) - salt_EvPrRn ) |
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& *mass2rUnit |
| 314 |
ENDDO |
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ENDDO |
| 316 |
ENDIF |
| 317 |
|
| 318 |
ELSE |
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C- use uniform tracer value to calculate forcing term: |
| 320 |
|
| 321 |
IF (temp_EvPrRn.NE.UNSET_RL) THEN |
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C account for Rain/Evap heat content (temp_EvPrRn) assuming uniform SST (=tRef) |
| 323 |
DO j = jMin, jMax |
| 324 |
DO i = iMin, iMax |
| 325 |
surfaceForcingT(i,j,bi,bj) = surfaceForcingT(i,j,bi,bj) |
| 326 |
& + EmPmR(i,j,bi,bj) |
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& *( tRef(ks) - temp_EvPrRn ) |
| 328 |
& *mass2rUnit |
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ENDDO |
| 330 |
ENDDO |
| 331 |
ENDIF |
| 332 |
IF (salt_EvPrRn.NE.UNSET_RL) THEN |
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C converts EmPmR to virtual salt flux using uniform salinity (default=35) |
| 334 |
DO j = jMin, jMax |
| 335 |
DO i = iMin, iMax |
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surfaceForcingS(i,j,bi,bj) = surfaceForcingS(i,j,bi,bj) |
| 337 |
& + EmPmR(i,j,bi,bj) |
| 338 |
& *( convertFW2Salt - salt_EvPrRn ) |
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& *mass2rUnit |
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ENDDO |
| 341 |
ENDDO |
| 342 |
ENDIF |
| 343 |
|
| 344 |
C- end local-surface-tracer / uniform-value distinction |
| 345 |
ENDIF |
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|
| 347 |
ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 350 |
|
| 351 |
#ifdef ALLOW_PTRACERS |
| 352 |
IF ( usePTRACERS ) THEN |
| 353 |
CALL PTRACERS_FORCING_SURF( |
| 354 |
I relaxForcingS, |
| 355 |
I bi, bj, iMin, iMax, jMin, jMax, |
| 356 |
I myTime,myIter,myThid ) |
| 357 |
ENDIF |
| 358 |
#endif /* ALLOW_PTRACERS */ |
| 359 |
|
| 360 |
#ifdef ATMOSPHERIC_LOADING |
| 361 |
C-- Atmospheric surface Pressure loading : added to phi0surf when using Z-coord; |
| 362 |
C Not yet implemented for Ocean in P: would need to be applied to the other end |
| 363 |
C of the column, as a vertical velocity (omega); (meaningless for Atmos in P). |
| 364 |
C- Note: |
| 365 |
C Using P-coord., a hack (now directly applied from S/R INI_FORCING) |
| 366 |
C is sometime used to read phi0surf from a file (pLoadFile) instead |
| 367 |
C of computing it from bathymetry & density ref. profile. |
| 368 |
|
| 369 |
IF ( usingZCoords ) THEN |
| 370 |
C The true atmospheric P-loading is not yet implemented for P-coord |
| 371 |
C (requires time varying dP(Nr) like dP(k-bottom) with NonLin FS). |
| 372 |
IF ( useRealFreshWaterFlux ) THEN |
| 373 |
DO j = jMin, jMax |
| 374 |
DO i = iMin, iMax |
| 375 |
phi0surf(i,j,bi,bj) = ( pLoad(i,j,bi,bj) |
| 376 |
& +sIceLoad(i,j,bi,bj)*gravity |
| 377 |
& )*recip_rhoConst |
| 378 |
ENDDO |
| 379 |
ENDDO |
| 380 |
ELSE |
| 381 |
DO j = jMin, jMax |
| 382 |
DO i = iMin, iMax |
| 383 |
phi0surf(i,j,bi,bj) = pLoad(i,j,bi,bj)*recip_rhoConst |
| 384 |
ENDDO |
| 385 |
ENDDO |
| 386 |
ENDIF |
| 387 |
c ELSEIF ( usingPCoords ) THEN |
| 388 |
C-- This is a hack used to read phi0surf from a file (pLoadFile) |
| 389 |
C instead of computing it from bathymetry & density ref. profile. |
| 390 |
C ==> now done only once, in S/R INI_FORCING |
| 391 |
c DO j = jMin, jMax |
| 392 |
c DO i = iMin, iMax |
| 393 |
c phi0surf(i,j,bi,bj) = pLoad(i,j,bi,bj) |
| 394 |
c ENDDO |
| 395 |
c ENDDO |
| 396 |
ENDIF |
| 397 |
#endif /* ATMOSPHERIC_LOADING */ |
| 398 |
|
| 399 |
#ifdef ALLOW_SHELFICE |
| 400 |
IF ( usingZCoords ) THEN |
| 401 |
IF ( useSHELFICE) THEN |
| 402 |
DO j = jMin, jMax |
| 403 |
DO i = iMin, iMax |
| 404 |
phi0surf(i,j,bi,bj) = phi0surf(i,j,bi,bj) |
| 405 |
& + shelficeLoadAnomaly(i,j,bi,bj)*recip_rhoConst |
| 406 |
ENDDO |
| 407 |
ENDDO |
| 408 |
ENDIF |
| 409 |
ENDIF |
| 410 |
#endif /* ALLOW_SHELFICE */ |
| 411 |
|
| 412 |
#ifdef ALLOW_EBM |
| 413 |
c-- Values for surfaceForcingT, surfaceForcingS |
| 414 |
c are overwritten by those produced by EBM |
| 415 |
cph AD recomputation problems if these IF useEBM are used |
| 416 |
cph IF ( useEBM ) THEN |
| 417 |
CALL EBM_FORCING_SURF( |
| 418 |
I bi, bj, iMin, iMax, jMin, jMax, |
| 419 |
I myTime,myIter,myThid ) |
| 420 |
cph ENDIF |
| 421 |
#endif |
| 422 |
|
| 423 |
RETURN |
| 424 |
END |
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