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C $Header: /u/gcmpack/MITgcm/pkg/dic/o2_surfforcing.F,v 1.18 2008/02/29 22:36:13 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: O2_SURFFORCING |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE O2_SURFFORCING( PTR_O2, SGO2, |
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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 oxygen air-sea flux terms |
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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_ABIOTIC.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 PTR_O2 :: oxygen tracer field |
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_RL myTime |
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_RL PTR_O2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER iMin,iMax,jMin,jMax, bi, bj |
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INTEGER myIter, myThid |
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|
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c !OUTPUT PARAMETERS: =================================================== |
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C SGO2 :: air-sea exchange of oxygen |
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_RL SGO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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#ifdef ALLOW_PTRACERS |
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|
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#ifdef ALLOW_O2 |
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|
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C !LOCAL VARIABLES: =================================================== |
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C I, J, K - Loop counters |
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INTEGER I,J,K |
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C Solubility relation coefficients |
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_RL SchmidtNoO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL O2sat(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL Kwexch(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL FluxO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL aTT |
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_RL aTK |
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_RL aTS |
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_RL aTS2 |
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_RL aTS3 |
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_RL aTS4 |
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_RL aTS5 |
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_RL o2s |
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_RL ttemp |
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_RL stemp |
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_RL oCnew |
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CEOP |
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|
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K=1 |
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|
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C calculate SCHMIDT NO. for O2 |
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DO j=jmin,jmax |
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DO i=imin,imax |
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IF (maskC(i,j,k,bi,bj).NE.0.) THEN |
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ttemp = theta(i,j,k,bi,bj) |
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stemp = salt(i,j,k,bi,bj) |
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|
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SchmidtNoO2(i,j) = |
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& sox1 |
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& + sox2 * ttemp |
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& + sox3 * ttemp*ttemp |
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& + sox4 * ttemp*ttemp*ttemp |
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|
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C Determine surface flux of O2 |
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C exchange coeff accounting for ice cover and Schmidt no. |
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C Kwexch_Pre= pisvel*(1-fice): previously computed in dic_surfforcing.F |
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|
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Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj) |
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& / sqrt(SchmidtNoO2(i,j)/660.0 _d 0) |
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|
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C determine saturation O2 |
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C using Garcia and Gordon (1992), L&O (mistake in original???) |
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aTT = 298.15 _d 0 -ttemp |
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aTK = 273.15 _d 0 +ttemp |
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aTS = log(aTT/aTK) |
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aTS2 = aTS*aTS |
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aTS3 = aTS2*aTS |
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aTS4 = aTS3*aTS |
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aTS5 = aTS4*aTS |
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|
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oCnew = oA0 + oA1*aTS + oA2*aTS2 + oA3*aTS3 + |
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& oA4*aTS4 + oA5*aTS5 |
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& + stemp*(oB0 + oB1*aTS + oB2*aTS2 + oB3*aTS3) |
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& + oC0*(stemp*stemp) |
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|
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o2s = EXP(oCnew) |
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|
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c Convert from ml/l to mol/m^3 |
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O2sat(i,j) = o2s/22391.6 _d 0 * 1. _d 3 |
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C Determine flux, inc. correction for local atmos surface pressure |
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FluxO2(i,j) = Kwexch(i,j)* |
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& (AtmosP(i,j,bi,bj)*O2sat(i,j) |
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& - PTR_O2(i,j,K)) |
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ELSE |
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FluxO2(i,j) = 0. _d 0 |
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ENDIF |
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END DO |
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END DO |
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C update surface tendencies |
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DO j=jmin,jmax |
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DO i=imin,imax |
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SGO2(i,j)= FluxO2(i,j) |
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& *recip_drF(K) * recip_hFacC(i,j,K,bi,bj) |
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ENDDO |
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ENDDO |
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#endif |
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#endif |
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|
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|
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RETURN |
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END |
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