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C $Header: /u/gcmpack/MITgcm/pkg/dic/alk_surfforcing.F,v 1.10 2007/10/26 21:08:12 dfer Exp $ |
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C $Name: $ |
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|
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#include "DIC_OPTIONS.h" |
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#include "GCHEM_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: ALK_SURFFORCING |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE ALK_SURFFORCING( PTR_ALK , GALK, |
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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 alkalinity change due to freshwater flux |
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C Update alkalinity tendency term |
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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 "FFIELDS.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 bi,bj :: tile indices |
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C PTR_ALK :: alkalinity field |
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INTEGER myIter, myThid |
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_RL myTime |
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_RL PTR_ALK(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 GALK :: tendency term of alkalinity |
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_RL GALK(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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#ifdef ALLOW_PTRACERS |
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#ifdef DIC_BIOTIC |
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|
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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INTEGER i,j |
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CEOP |
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|
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#ifdef ALLOW_OLD_VIRTUALFLUX |
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DO j=jmin,jmax |
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DO i=imin,imax |
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IF (maskC(i,j,1,bi,bj).NE.0. _d 0) THEN |
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c calculate virtual flux |
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c EminusPforV = dS/dt*(1/Sglob) |
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C NOTE: Be very careful with signs here! |
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C Positive EminusPforV => loss of water to atmos and increase |
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C in salinity. Thus, also increase in other surface tracers |
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C (i.e. positive virtual flux into surface layer) |
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GALK(i,j)=gsm_ALK*surfaceForcingS(i,j,bi,bj)* |
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& recip_drF(1)/gsm_S |
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c OR |
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c let virtual flux be zero |
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c GALK(i,j)=0.d0 |
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c |
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ELSE |
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GALK(i,j)=0. _d 0 |
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ENDIF |
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ENDDO |
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ENDDO |
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#endif /* ALLOW_OLD_VIRTUALFLUX */ |
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|
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#endif |
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#endif |
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RETURN |
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END |
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