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cfc11_surfforcing.F
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C $Header: /u/gcmpack/MITgcm/pkg/cfc/cfc11_surfforcing.F,v 1.4 2013/06/10 02:56:57 jmc Exp $
C $Name: $
#include "GCHEM_OPTIONS.h"
CBOP
C !ROUTINE: CFC11_SURFFORCING
C !INTERFACE:
SUBROUTINE CFC11_SURFFORCING(
I pTr_CFC11, AtmosCFC11,
O fluxCFC11,
I bi, bj, iMin, iMax, jMin, jMax,
I myTime, myIter, myThid )
C !DESCRIPTION:
C *==========================================================*
C | SUBROUTINE CFC11_SURFFORCING
C | o Calculate the CFC11 air-sea fluxes
C *==========================================================*
C !USES:
IMPLICIT NONE
C == GLobal variables ==
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"
#include "DYNVARS.h"
#include "CFC.h"
C !INPUT/OUTPUT PARAMETERS:
C pTr_CFC11 :: ocean CFC11 concentration
C AtmosCFC11 :: atmospheric CFC11 field
C fluxCFC11 :: air-sea CFC11 fluxes
C bi, bj :: current tile indices
C iMin,iMax :: computation domain, 1rst index bounds
C jMin,jMax :: computation domain, 2nd index bounds
C myTime :: current time in simulation
C myIter :: current iteration number
C myThid :: my Thread Id number
_RL pTr_CFC11 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
_RL AtmosCFC11(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL fluxCFC11 (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
INTEGER bi, bj
INTEGER iMin, iMax, jMin, jMax
_RL myTime
INTEGER myIter, myThid
CEOP
#ifdef ALLOW_PTRACERS
#ifdef ALLOW_CFC
C !LOCAL VARIABLES:
C i, j, k - Loop counters
INTEGER i,j,k
C Solubility relation coefficients
_RL SchmidtNocfc11(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL SolCFC11(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
c _RL cfc11sat(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL Kwexch(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL Csat(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL ttemp, ttemp2
k=1
C calculate SCHMIDT NO. for O2
DO j=jMin,jMax
DO i=iMin,iMax
IF ( maskC(i,j,k,bi,bj).NE.zeroRS ) THEN
C calculate SCHMIDT NO. for CFC11
SchmidtNocfc11(i,j) =
& sca_11_1
& + sca_11_2 * theta(i,j,k,bi,bj)
& + sca_11_3 * theta(i,j,k,bi,bj)*theta(i,j,k,bi,bj)
& + sca_11_4 * theta(i,j,k,bi,bj)*theta(i,j,k,bi,bj)
& *theta(i,j,k,bi,bj)
c calculate solubility for CFC11
ttemp=( theta(i,j,k,bi,bj) + 273.16 _d 0)* 0.01 _d 0
ttemp2=( B3_11 * ttemp + B2_11 )*ttemp + B1_11
SolCFC11(i,j) =
& EXP ( A1_11
& + A2_11 / ttemp
& + A3_11 * log( ttemp )
& + A4_11 * ttemp * ttemp
& + Salt(i,j,k,bi,bj)* ttemp2 )
c conversion from mol/(l * atm) to mol/(m^3 * atm)
SolCFC11(i,j) = 1000. _d 0 * SolCFC11(i,j)
c conversion from mol/(m^3 * atm) to mol/(m3 * pptv)
SolCFC11(i,j) = 1. _d -12 * SolCFC11(i,j)
C Determine surface flux (Fcfc11)
Csat(i,j) = SolCFC11(i,j)*AtmosP(i,j,bi,bj)
& *AtmosCFC11(i,j)
Kwexch(i,j) = (1. _d 0 - fIce(i,j,bi,bj))
& * pisVel(i,j,bi,bj)
& / SQRT(SchmidtNoCFC11(i,j)/660. _d 0)
fluxCFC11(i,j) =
& Kwexch(i,j)*(Csat(i,j) - pTr_CFC11(i,j,1))
ELSE
fluxCFC11(i,j) = 0. _d 0
ENDIF
ENDDO
ENDDO
#endif /* ALLOW_CFC */
#endif /* ALLOW_PTRACERS */
RETURN
END
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