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C $Header: /u/gcmpack/MITgcm/pkg/dic/phos_flux.F,v 1.15 2010/08/16 10:38:50 mlosch Exp $ |
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C $Name: $ |
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#include "DIC_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: PHOS_FLUX |
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C !INTERFACE: ========================================================== |
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SUBROUTINE PHOS_FLUX( BIOac, pflux, exportflux, |
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I bi,bj,imin,imax,jmin,jmax, |
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I myIter,myTime,myThid) |
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|
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C !DESCRIPTION: |
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C Calculate the PO4 flux to depth from bio activity |
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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 "DYNVARS.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 "DIC_VARS.h" |
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|
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C !INPUT PARAMETERS: =================================================== |
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C myThid :: thread number |
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C myIter :: current timestep |
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C myTime :: current time |
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C BIOac :: biological productivity |
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INTEGER myIter |
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_RL myTime |
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INTEGER myThid |
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_RL BIOac(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER imin, imax, jmin, jmax, bi, bj |
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|
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C !OUTPUT PARAMETERS: =================================================== |
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C pflux :: changes to PO4 due to flux and reminerlization |
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_RL pflux (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL exportflux(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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|
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#if (defined ALLOW_PTRACERS && defined DIC_BIOTIC) |
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|
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C !LOCAL VARIABLES: ==================================================== |
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C i,j,k :: loop indices |
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c ko :: loop-within-loop index |
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c bexport :: flux of phosphorus from base each "productive" |
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c layer |
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c depth_l :: depth and lower interface |
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c flux_u, flux_l :: flux through upper and lower interfaces |
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c reminFac :: abbreviation |
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c zbase :: depth of bottom of current productive layer |
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INTEGER I,J,k, ko, kop1 |
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_RL zbase |
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_RL bexport(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL reminFac |
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_RL depth_l |
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_RL flux_u (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL flux_l |
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CEOP |
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|
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C- Calculate PO4 flux from base of each layer |
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DO k=1,nlev |
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DO j=jmin,jmax |
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DO i=imin,imax |
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bexport(i,j) = 0. _d 0 |
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IF ( _hFacC(i,j,k,bi,bj).gt.0. _d 0 ) THEN |
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C-- If no layer below initial layer (because of bottom or |
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C-- topography), then remineralize in here |
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IF (k.EQ.Nr) THEN |
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pflux(i,j,k)=pflux(i,j,k)+BIOac(i,j,k)*(1. _d 0-DOPfraction) |
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ELSEIF (hFacC(i,j,k+1,bi,bj).EQ.0. _d 0) THEN |
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pflux(i,j,k)=pflux(i,j,k)+BIOac(i,j,k)*(1. _d 0-DOPfraction) |
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ELSE |
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C- flux out of layer k |
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bexport(i,j)=BIOac(i,j,k)*(1. _d 0-DOPfraction) |
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& *drF(k) * _hFacC(i,j,k,bi,bj) |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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C-- If available, flux phosphate downward; |
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C-- calculate flux to each layer from base of k |
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zbase=-rF(k+1) |
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C-- Upper flux |
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DO j=jmin,jmax |
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DO i=imin,imax |
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flux_u(i,j) = bexport(i,j) |
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ENDDO |
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ENDDO |
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C Instead of running the loop to ko=Nr and masking the last |
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C flux_l, let ko reach only Nr-1 and do a special loop for ko=Nr, |
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C in order to save a few expensive exp-function calls |
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DO ko=k+1,Nr-1 |
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kop1 = MIN(Nr,ko+1) |
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#ifndef NONLIN_FRSURF |
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C For the linear free surface, hFacC can be omitted, buying another |
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C performance increase of a factor of six on a vector computer. |
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C For now this is not implemented via run time flags, in order to |
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C avoid making this code too complicated. |
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depth_l = -rF(ko) + drF(ko) |
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C reminFac = (depth_l/zbase)**(-Kremin) |
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C The following form does the same, but is faster |
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reminFac = exp(-Kremin*log(depth_l/zbase)) |
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#endif |
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DO j=jmin,jmax |
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DO i=imin,imax |
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IF ( bexport(i,j) .NE. 0. _d 0 ) THEN |
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C-- Lower flux (no flux to ocean bottom) |
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#ifdef NONLIN_FRSURF |
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depth_l = -rF(ko) + drF(ko) * _hFacC(i,j,ko,bi,bj) |
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C reminFac = (depth_l/zbase)**(-Kremin) |
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C The following form does the same, but is faster |
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reminFac = exp(-Kremin*log(depth_l/zbase)) |
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#endif |
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flux_l = bexport(i,j)*reminFac |
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& *maskC(i,j,kop1,bi,bj) |
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C |
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pflux(i,j,ko)=pflux(i,j,ko) + (flux_u(i,j)-flux_l) |
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& *recip_drF(ko) * _recip_hFacC(i,j,ko,bi,bj) |
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exportflux(i,j,ko)=exportflux(i,j,ko)+flux_u(i,j) |
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C-- Store flux through upper layer for the next k-level |
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flux_u(i,j) = flux_l |
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C endif bexport .ne. 0 |
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ENDIF |
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C i,j-loops |
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ENDDO |
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ENDDO |
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C ko-loop |
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ENDDO |
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C now do ko = Nr |
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ko = Nr |
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flux_l = 0. _d 0 |
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DO j=jmin,jmax |
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DO i=imin,imax |
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pflux(i,j,ko)=pflux(i,j,ko) + (flux_u(i,j)-flux_l) |
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& *recip_drF(ko) * _recip_hFacC(i,j,ko,bi,bj) |
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exportflux(i,j,ko)=exportflux(i,j,ko)+flux_u(i,j) |
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ENDDO |
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ENDDO |
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C k-loop |
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ENDDO |
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c |
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#endif /* defined ALLOW_PTRACERS && defined DIC_BIOTIC */ |
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RETURN |
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END |
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