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C $Header: /u/gcmpack/MITgcm/pkg/ptracers/ptracers_forcing_surf.F,v 1.11 2012/03/08 17:13:31 jmc Exp $ |
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C $Name: $ |
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|
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#include "PTRACERS_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: PTRACERS_FORCING_SURF |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE PTRACERS_FORCING_SURF( |
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I relaxForcingS, |
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I bi, bj, iMin, iMax, jMin, jMax, |
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I myTime,myIter,myThid ) |
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|
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C !DESCRIPTION: |
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C Precomputes surface forcing term for pkg/ptracers. |
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C Precomputation is needed because of non-local KPP transport term, |
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C routine KPP_TRANSPORT_PTR. |
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|
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C !USES: =============================================================== |
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IMPLICIT NONE |
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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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#include "FFIELDS.h" |
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#include "PTRACERS_SIZE.h" |
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#include "PTRACERS_PARAMS.h" |
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#include "PTRACERS_START.h" |
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#include "PTRACERS_FIELDS.h" |
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|
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C !INPUT PARAMETERS: =================================================== |
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C relaxForcingS :: Salt forcing due to surface relaxation |
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C bi,bj :: tile indices |
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C myTime :: model time |
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C myIter :: time-step number |
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C myThid :: thread number |
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_RL relaxForcingS(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER bi, bj, iMin, iMax, 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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#ifdef ALLOW_PTRACERS |
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|
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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C iTrc :: tracer index |
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C ks :: surface level index |
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INTEGER i, j |
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INTEGER iTrc, ks |
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_RL add2EmP(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL epsil, cutoff, tmpVar |
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CEOP |
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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 Example of how to add forcing at the surface |
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DO iTrc=1,PTRACERS_numInUse |
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c IF ( PTRACERS_StepFwd(iTrc) ) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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C- Case of age-tracer: at the surface, add 10.days relaxation towards zero: |
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surfaceForcingPTr(i,j,bi,bj,iTrc) = |
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& + 1. _d 0 / (10. _d 0 * 86400. _d 0) |
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& * ( 0. _d 0 - pTracer(i,j,ks,bi,bj,iTrc) ) |
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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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c ENDIF |
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ENDDO |
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|
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C-- Option to convert Salt-relaxation into additional EmP contribution |
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IF ( PTRACERS_addSrelax2EmP ) THEN |
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C- here we assume that salt_EvPrRn = 0 |
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C set cutoff value to prevent too large additional EmP: |
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C current limit is set to 0.1 CFL |
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epsil = 1. _d -10 |
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cutoff = 0.1 _d 0 *drF(ks)/PTRACERS_dTLev(ks) |
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IF ( ( (nonlinFreeSurf.GT.0 .OR. usingPCoords) |
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& .AND. useRealFreshWaterFlux ) |
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& .OR.convertFW2Salt .EQ. -1. ) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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tmpVar = MAX( salt(i,j,ks,bi,bj), epsil ) |
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add2EmP(i,j) = relaxForcingS(i,j)/tmpVar |
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add2EmP(i,j) = rUnit2mass |
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& *MAX( -cutoff, MIN( add2EmP(i,j), cutoff ) ) |
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ENDDO |
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ENDDO |
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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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add2EmP(i,j) = relaxForcingS(i,j)/convertFW2Salt |
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add2EmP(i,j) = rUnit2mass |
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& *MAX( -cutoff, MIN( add2EmP(i,j), cutoff ) ) |
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ENDDO |
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ENDDO |
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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(add2EmP,'Add2EmP ',0,1,2,bi,bj,myThid) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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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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add2EmP(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDIF |
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C-- end of "addEmP" setting |
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|
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#ifdef EXACT_CONSERV |
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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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DO iTrc=1,PTRACERS_numInUse |
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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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c |
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IF ( PTRACERS_StepFwd(iTrc) .AND. |
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& PTRACERS_EvPrRn(iTrc).NE.UNSET_RL ) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingPTr(i,j,bi,bj,iTrc) = |
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& surfaceForcingPTr(i,j,bi,bj,iTrc) |
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& + ( PmEpR(i,j,bi,bj) - add2EmP(i,j) ) |
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& *( PTRACERS_EvPrRn(iTrc) - pTracer(i,j,ks,bi,bj,iTrc) ) |
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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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ENDDO |
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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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DO iTrc=1,PTRACERS_numInUse |
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|
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IF ( PTRACERS_StepFwd(iTrc) .AND. |
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& PTRACERS_EvPrRn(iTrc).NE.UNSET_RL ) THEN |
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C account for Rain/Evap tracer content (PTRACERS_EvPrRn) using |
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C local surface tracer |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingPTr(i,j,bi,bj,iTrc) = |
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& surfaceForcingPTr(i,j,bi,bj,iTrc) |
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& + ( EmPmR(i,j,bi,bj) + add2EmP(i,j) ) |
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& *( pTracer(i,j,ks,bi,bj,iTrc) - PTRACERS_EvPrRn(iTrc) ) |
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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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ENDDO |
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|
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ELSE |
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C- use uniform tracer value to calculate forcing term: |
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|
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DO iTrc=1,PTRACERS_numInUse |
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|
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IF ( PTRACERS_StepFwd(iTrc) .AND. |
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& PTRACERS_EvPrRn(iTrc).NE.UNSET_RL ) THEN |
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C account for Rain/Evap tracer content (PTRACERS_EvPrRn) assuming uniform |
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C surface tracer (=PTRACERS_ref) |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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surfaceForcingPTr(i,j,bi,bj,iTrc) = |
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& surfaceForcingPTr(i,j,bi,bj,iTrc) |
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& + ( EmPmR(i,j,bi,bj) + add2EmP(i,j) ) |
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& *( PTRACERS_ref(ks,iTrc) - PTRACERS_EvPrRn(iTrc) ) |
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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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ENDDO |
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|
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C- end local-surface-tracer / uniform-value distinction |
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ENDIF |
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|
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ENDIF |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#endif /* ALLOW_PTRACERS */ |
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|
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RETURN |
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END |
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