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#include "CPP_OPTIONS.h" |
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#include "PTRACERS_OPTIONS.h" |
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#include "GCHEM_OPTIONS.h" |
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|
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CStartOfInterFace |
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SUBROUTINE DIC_SURFFORCING( PTR_CO2 , GDC, |
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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 /==========================================================\ |
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C | SUBROUTINE DIC_SURFFORCING | |
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C | o Calculate the carbon air-sea flux terms | |
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C | o following external_forcing_dic.F from Mick | |
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C |==========================================================| |
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IMPLICIT NONE |
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|
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C == GLobal variables == |
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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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#ifdef DIC_BIOTIC |
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#include "PTRACERS.h" |
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#endif |
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|
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C == Routine arguments == |
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INTEGER myIter, myThid |
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_RL myTime |
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_RL PTR_CO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL GDC(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER iMin,iMax,jMin,jMax, bi, bj |
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|
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#ifdef ALLOW_PTRACERS |
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#ifdef DIC_ABIOTIC |
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C == Local variables == |
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INTEGER I,J, kLev |
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C Number of iterations for pCO2 solvers... |
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INTEGER inewtonmax |
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INTEGER ibrackmax |
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INTEGER donewt |
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C Solubility relation coefficients |
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_RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL pCO2sat(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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C local variables for carbon chem |
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_RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL FluxCO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
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|
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kLev=1 |
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|
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C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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AtmospCO2(i,j,bi,bj)=278.0d-6 |
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ENDDO |
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ENDDO |
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|
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|
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C ================================================================= |
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C determine inorganic carbon chem coefficients |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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|
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#ifdef DIC_BIOTIC |
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cQQQQ check ptracer numbers |
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surfalk(i,j) = PTRACER(i,j,klev,bi,bj,2) |
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& * maskC(i,j,kLev,bi,bj) |
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surfphos(i,j) = PTRACER(i,j,klev,bi,bj,3) |
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& * maskC(i,j,kLev,bi,bj) |
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#else |
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surfalk(i,j) = 2.366595 * salt(i,j,kLev,bi,bj)/gsm_s |
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& * maskC(i,j,kLev,bi,bj) |
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surfphos(i,j) = 5.1225e-4 * maskC(i,j,kLev,bi,bj) |
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#endif |
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C FOR NON-INTERACTIVE Si |
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surfsi(i,j) = 7.6838e-3 * maskC(i,j,kLev,bi,bj) |
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ENDDO |
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ENDDO |
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|
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CALL CARBON_COEFFS( |
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I theta,salt, |
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I bi,bj,iMin,iMax,jMin,jMax) |
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C==================================================================== |
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|
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#define PH_APPROX |
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c set number of iterations for [H+] solvers |
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#ifdef PH_APPROX |
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inewtonmax = 1 |
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#else |
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inewtonmax = 10 |
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#endif |
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ibrackmax = 30 |
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C determine pCO2 in surface ocean |
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C set guess of pH for first step here |
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C IF first step THEN use bracket-bisection for first step, |
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C and determine carbon coefficients for safety |
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C ELSE use newton-raphson with previous H+(x,y) as first guess |
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|
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donewt=1 |
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|
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c for first few timesteps |
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IF(myIter .le. (nIter0+inewtonmax) )then |
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donewt=0 |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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pH(i,j,bi,bj) = 8.0 |
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ENDDO |
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ENDDO |
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#ifdef PH_APPROX |
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print*,'QQ: pCO2 approximation method' |
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c first approxmation |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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CALL CALC_PCO2_APPROX( |
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I theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj), |
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I PTR_CO2(i,j,kLev), surfphos(i,j), |
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I surfsi(i,j),surfalk(i,j), |
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I ak1(i,j,bi,bj),ak2(i,j,bi,bj), |
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I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj), |
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I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj), |
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I aksi(i,j,bi,bj),akf(i,j,bi,bj),ff(i,j,bi,bj), |
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I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj), |
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U pH(i,j,bi,bj),pCO2(i,j,bi,bj) ) |
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ENDDO |
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ENDDO |
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#else |
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print*,'QQ: pCO2 full method' |
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#endif |
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ENDIF |
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|
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|
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c pCO2 solver... |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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|
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IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN |
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#ifdef PH_APPROX |
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CALL CALC_PCO2_APPROX( |
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I theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj), |
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I PTR_CO2(i,j,kLev), surfphos(i,j), |
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I surfsi(i,j),surfalk(i,j), |
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I ak1(i,j,bi,bj),ak2(i,j,bi,bj), |
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I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj), |
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I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj), |
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I aksi(i,j,bi,bj),akf(i,j,bi,bj),ff(i,j,bi,bj), |
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I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj), |
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U pH(i,j,bi,bj),pCO2(i,j,bi,bj) ) |
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#else |
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CALL CALC_PCO2(donewt,inewtonmax,ibrackmax, |
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I theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj), |
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I PTR_CO2(i,j,kLev), surfphos(i,j), |
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I surfsi(i,j),surfalk(i,j), |
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I ak1(i,j,bi,bj),ak2(i,j,bi,bj), |
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I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj), |
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I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj), |
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I aksi(i,j,bi,bj),akf(i,j,bi,bj),ff(i,j,bi,bj), |
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I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj), |
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U pH(i,j,bi,bj),pCO2(i,j,bi,bj) ) |
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#endif |
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ELSE |
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pCO2(i,j,bi,bj)=0. _d 0 |
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END IF |
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ENDDO |
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ENDDO |
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|
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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|
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IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN |
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C calculate SCHMIDT NO. for CO2 |
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SchmidtNoDIC(i,j) = |
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& sca1 |
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& + sca2 * theta(i,j,kLev,bi,bj) |
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& + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
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& + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
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& *theta(i,j,kLev,bi,bj) |
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|
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C Determine surface flux (FDIC) |
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C first correct pCO2at for surface atmos pressure |
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pCO2sat(i,j) = |
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& AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj) |
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c find exchange coefficient |
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c account for schmidt number and and varible piston velocity |
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Kwexch(i,j) = |
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& pisvel(i,j,bi,bj) |
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& / sqrt(SchmidtNoDIC(i,j)/660.0) |
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c OR use a constant coeff |
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c Kwexch(i,j) = 5e-5 |
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c ice influence |
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cQQ Kwexch(i,j) =(1.d0-Fice(i,j,bi,bj))*Kwexch(i,j) |
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|
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|
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C Calculate flux in terms of DIC units using K0, solubility |
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C Flux = Vp * ([CO2sat] - [CO2]) |
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C CO2sat = K0*pCO2atmos*P/P0 |
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C Converting pCO2 to [CO2] using ff, as in CALC_PCO2 |
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FluxCO2(i,j) = |
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& maskC(i,j,kLev,bi,bj)*Kwexch(i,j)*( |
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& ak0(i,j,bi,bj)*pCO2sat(i,j) - |
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& ff(i,j,bi,bj)*pCO2(i,j,bi,bj) |
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& ) |
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ELSE |
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FluxCO2(i,j) = 0. |
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ENDIF |
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C convert flux (mol kg-1 m s-1) to (mol m-2 s-1) |
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FluxCO2(i,j) = FluxCO2(i,j)/permil |
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|
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IF (maskC(i,j,kLev,bi,bj).NE.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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C ...so here, VirtualFLux = dC/dt! |
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VirtualFlux(i,j)=gsm_DIC*surfaceTendencyS(i,j,bi,bj)/gsm_s |
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c OR |
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c let virtual flux be zero |
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c VirtualFlux(i,j)=0.d0 |
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c |
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ELSE |
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VirtualFlux(i,j)=0. _d 0 |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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C update tendency |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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GDC(i,j)= maskC(i,j,kLev,bi,bj)*( |
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& FluxCO2(i,j)*recip_drF(kLev) |
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& + VirtualFlux(i,j) |
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& ) |
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ENDDO |
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ENDDO |
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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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