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C $Header: /u/gcmpack/MITgcm/pkg/bling/bling_airseaflux.F,v 1.2 2016/09/12 20:00:28 mmazloff Exp $ |
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C $Name: $ |
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|
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#include "BLING_OPTIONS.h" |
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#include "PTRACERS_OPTIONS.h" |
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|
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CBOP |
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subroutine BLING_AIRSEAFLUX( |
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I PTR_DIC, PTR_ALK, PTR_O2, PTR_NO3, PTR_PO4, |
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O SGDIC, SGO2, FluxO2, |
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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 bling_airseaflux |
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C | o Calculate the carbon and oxygen air-sea flux terms |
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C | Adapted from pkg/dic/dic_surfforcing.F |
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C | - Get atmospheric pCO2 value |
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C | Option 1: constant value, default 268.d-6, can be changed in |
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C | data.bling |
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C | Option 2: read 2D field using EXF pkg |
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C | - Update pCO2 and pH |
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C ================================================================= |
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|
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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 "BLING_VARS.h" |
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#ifdef ALLOW_EXF |
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# include "EXF_FIELDS.h" |
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#endif |
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#ifdef ALLOW_AUTODIFF |
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# include "tamc.h" |
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#endif |
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|
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C === Routine arguments === |
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C myTime :: current time |
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C myIter :: current timestep |
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C myThid :: thread Id. number |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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INTEGER iMin, iMax, jMin, jMax, bi, bj |
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C === Input === |
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C PTR_DIC :: DIC tracer field |
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C PTR_ALK :: alkalinity tracer field |
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C PTR_NO3 :: nitrate tracer field |
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C PTR_PO4 :: phosphate tracer field |
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C PTR_O2 :: oxygen tracer field |
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_RL PTR_DIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL PTR_ALK(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL PTR_NO3(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL PTR_PO4(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL PTR_O2 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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C === Output === |
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C SGDIC :: surface tendency of DIC due to air-sea exchange |
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C SGO2 :: surface tendency of O2 due to air-sea exchange |
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C FluxO2 :: air-sea flux of O2 |
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C (FluxCO2 is a global variable) |
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_RL SGDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL SGO2(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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|
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|
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#ifdef ALLOW_PTRACERS |
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|
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C === Local variables === |
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C i,j :: Loop counters |
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INTEGER i,j,klev |
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C Number of iterations for pCO2 solvers |
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_RL co3dummy |
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_RL Kwexch_Pre (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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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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_RL pisvel (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 surftemp (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL surfsalt (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL surfdic (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C o2 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_o2 (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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C---------------------------------------------------------------------- |
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C First, carbon |
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C---------------------------------------------------------------------- |
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klev=1 |
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C determine inorganic carbon chem coefficients |
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DO j=jmin,jmax |
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DO i=imin,imax |
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|
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surfalk(i,j) = PTR_ALK(i,j,1) |
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& * maskC(i,j,1,bi,bj) |
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surfphos(i,j) = PTR_PO4(i,j,1) |
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& * maskC(i,j,1,bi,bj) |
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|
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C FOR NON-INTERACTIVE Si |
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surfsi(i,j) = SILICA(i,j,bi,bj) * maskC(i,j,1,bi,bj) |
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surftemp(i,j) = theta(i,j,1,bi,bj) |
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surfsalt(i,j) = salt(i,j,1,bi,bj) |
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surfdic(i,j) = PTR_DIC(i,j,1) |
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|
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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 surftemp,surfsalt, |
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I bi,bj,iMin,iMax,jMin,jMax,myThid) |
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|
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DO j=jmin,jmax |
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DO i=imin,imax |
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C Compute Kwexch_Pre which is re-used for flux of O2 |
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|
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c Read EXF winds instead of value from file: |
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#ifdef ALLOW_EXF |
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wind(i,j,bi,bj) = wspeed(i,j,bi,bj) |
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#endif |
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|
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C Pre-compute part of exchange coefficient: pisvel*(1-fice) |
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C Schmidt number is accounted for later |
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pisvel(i,j) = 0.337 _d 0 * wind(i,j,bi,bj)**2/3.6 _d 5 |
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Kwexch_Pre(i,j) = pisvel(i,j) |
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& * (1. _d 0 - FIce(i,j,bi,bj)) |
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|
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ENDDO |
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ENDDO |
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|
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c pCO2 solver... |
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|
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CADJ STORE ph = comlev1, key = ikey_dynamics |
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|
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C$TAF LOOP = parallel |
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DO j=jmin,jmax |
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C$TAF LOOP = parallel |
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DO i=imin,imax |
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|
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IF ( maskC(i,j,klev,bi,bj).NE.0. _d 0 ) THEN |
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CALL CALC_PCO2_APPROX( |
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I surftemp(i,j),surfsalt(i,j), |
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I surfdic(i,j), 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), |
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I ak0(i,j,bi,bj), fugf(i,j,bi,bj), |
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I 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,klev,bi,bj),pCO2(i,j,bi,bj),co3dummy, |
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I i,j,klev,bi,bj,myIter,myThid ) |
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ELSE |
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pCO2(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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|
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ENDDO |
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ENDDO |
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|
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DO j=jmin,jmax |
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DO i=imin,imax |
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|
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IF ( maskC(i,j,1,bi,bj).NE.0. _d 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,1,bi,bj) |
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& + sca3 * theta(i,j,1,bi,bj)*theta(i,j,1,bi,bj) |
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& + sca4 * theta(i,j,1,bi,bj)*theta(i,j,1,bi,bj) |
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& *theta(i,j,1,bi,bj) |
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c make sure Schmidt number is not negative (will happen if temp>39C) |
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SchmidtNoDIC(i,j)=max(1.0 _d -2, SchmidtNoDIC(i,j)) |
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|
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C First determine local saturation pCO2 |
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#ifdef USE_EXFCO2 |
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pCO2sat(i,j) = apco2(i,j,bi,bj) |
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#else |
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pCO2sat(i,j) = bling_pCO2 |
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#endif |
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|
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c Correct for atmospheric pressure |
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#ifdef USE_EXF_ATMPRES |
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C Atm pressure in N/m2, convert to bars |
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pCO2sat(i,j) = pCO2sat(i,j)*(apressure(i,j,bi,bj)*0.00001) |
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#else |
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pCO2sat(i,j) = pCO2sat(i,j)*AtmosP(i,j,bi,bj) |
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#endif |
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|
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C then account for Schmidt number |
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Kwexch(i,j) = Kwexch_Pre(i,j) |
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& / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0) |
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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 = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean) |
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FluxCO2(i,j,bi,bj) = |
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& Kwexch(i,j)*( |
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& ff(i,j,bi,bj)*pCO2sat(i,j) - |
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& pCO2(i,j,bi,bj)*fugf(i,j,bi,bj) |
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& *ak0(i,j,bi,bj) ) |
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& |
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ELSE |
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FluxCO2(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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|
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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,bi,bj) = FluxCO2(i,j,bi,bj)/permil |
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|
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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=jmin,jmax |
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DO i=imin,imax |
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SGDIC(i,j)= recip_drF(1)*recip_hFacC(i,j,1,bi,bj) |
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& *FluxCO2(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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|
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C---------------------------------------------------------------------- |
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C Now oxygen |
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C---------------------------------------------------------------------- |
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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,1,bi,bj).NE.0.) THEN |
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ttemp = theta(i,j,1,bi,bj) |
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stemp = salt(i,j,1,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 above |
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|
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Kwexch_o2(i,j) = Kwexch_Pre(i,j) |
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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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|
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C Determine flux, inc. correction for local atmos surface pressure |
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#ifdef USE_EXF_ATMPRES |
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C Atm pressure in N/m2, convert to bars |
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FluxO2(i,j) = Kwexch_o2(i,j)*( |
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& (apressure(i,j,bi,bj)*0.00001) |
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& *O2sat(i,j) - PTR_O2(i,j,1) ) |
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#else |
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FluxO2(i,j) = Kwexch_o2(i,j)* |
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& (AtmosP(i,j,bi,bj)*O2sat(i,j) |
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& - PTR_O2(i,j,1)) |
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#endif |
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ELSE |
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FluxO2(i,j) = 0. _d 0 |
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ENDIF |
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|
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ENDDO |
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ENDDO |
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|
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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(1) * recip_hFacC(i,j,1,bi,bj) |
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ENDDO |
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ENDDO |
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|
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_EXCH_XY_RL( pCO2, mythid) |
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_EXCH_XYZ_RL( pH, mythid) |
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|
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#endif /* ALLOW_PTRACER */ |
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|
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RETURN |
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END |
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