| 1 |
dfer |
1.29 |
C $Header: /u/gcmpack/MITgcm/pkg/dic/dic_surfforcing.F,v 1.28 2011/06/24 01:35:32 jmc Exp $ |
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jmc |
1.6 |
C $Name: $ |
| 3 |
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edhill |
1.4 |
#include "DIC_OPTIONS.h" |
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stephd |
1.1 |
#include "PTRACERS_OPTIONS.h" |
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stephd |
1.5 |
CBOP |
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C !ROUTINE: DIC_SURFFORCING |
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C !INTERFACE: ========================================================== |
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jmc |
1.24 |
SUBROUTINE DIC_SURFFORCING( PTR_CO2 , PTR_ALK, PTR_PO4, GDC, |
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stephd |
1.1 |
I bi,bj,imin,imax,jmin,jmax, |
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I myIter,myTime,myThid) |
| 14 |
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| 15 |
stephd |
1.5 |
C !DESCRIPTION: |
| 16 |
jmc |
1.24 |
C Calculate the carbon air-sea flux terms |
| 17 |
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C following external_forcing_dic.F (OCMIP run) from Mick |
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stephd |
1.5 |
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C !USES: =============================================================== |
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stephd |
1.1 |
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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dfer |
1.20 |
#include "DIC_VARS.h" |
| 28 |
stephd |
1.1 |
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| 29 |
stephd |
1.5 |
C !INPUT PARAMETERS: =================================================== |
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C myThid :: thread number |
| 31 |
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C myIter :: current timestep |
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C myTime :: current time |
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c PTR_CO2 :: DIC tracer field |
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stephd |
1.1 |
INTEGER myIter, myThid |
| 35 |
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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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stephd |
1.12 |
_RL PTR_ALK(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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stephd |
1.5 |
INTEGER iMin,iMax,jMin,jMax, bi, bj |
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C !OUTPUT PARAMETERS: =================================================== |
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stephd |
1.8 |
c GDC :: tendency due to air-sea exchange |
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stephd |
1.1 |
_RL GDC(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#ifdef ALLOW_PTRACERS |
| 46 |
stephd |
1.5 |
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| 47 |
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C !LOCAL VARIABLES: ==================================================== |
| 48 |
jmc |
1.23 |
INTEGER i,j, kLev |
| 49 |
dfer |
1.29 |
_RL co3dummy |
| 50 |
stephd |
1.1 |
C Number of iterations for pCO2 solvers... |
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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) |
| 55 |
dfer |
1.17 |
_RL pisvel(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 56 |
stephd |
1.1 |
C local variables for carbon chem |
| 57 |
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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) |
| 59 |
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_RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 60 |
stephd |
1.27 |
_RL surftemp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 61 |
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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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dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
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stephd |
1.1 |
_RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 65 |
dfer |
1.16 |
#endif |
| 66 |
stephd |
1.5 |
CEOP |
| 67 |
stephd |
1.1 |
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| 68 |
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cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
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kLev=1 |
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stephd |
1.19 |
cc if coupled to atmsopheric model, use the |
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cc Co2 value passed from the coupler |
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c#ifndef USE_ATMOSCO2 |
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cC PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv |
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c DO j=1-OLy,sNy+OLy |
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c DO i=1-OLx,sNx+OLx |
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c AtmospCO2(i,j,bi,bj)=278.0 _d -6 |
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c ENDDO |
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c ENDDO |
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c#endif |
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stephd |
1.1 |
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| 83 |
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| 84 |
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C ================================================================= |
| 85 |
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C determine inorganic carbon chem coefficients |
| 86 |
stephd |
1.10 |
DO j=jmin,jmax |
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DO i=imin,imax |
| 88 |
stephd |
1.1 |
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| 89 |
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#ifdef DIC_BIOTIC |
| 90 |
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cQQQQ check ptracer numbers |
| 91 |
stephd |
1.27 |
#ifdef DIC_BOUNDS |
| 92 |
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surfalk(i,j) = max(0.4 _d 0, |
| 93 |
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& min(10. _d 0,PTR_ALK(i,j,klev))) |
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& * maskC(i,j,kLev,bi,bj) |
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surfphos(i,j) = max(1.0 _d -11, |
| 96 |
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& min(1._d -1, PTR_PO4(i,j,klev))) |
| 97 |
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& * maskC(i,j,kLev,bi,bj) |
| 98 |
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#else |
| 99 |
stephd |
1.12 |
surfalk(i,j) = PTR_ALK(i,j,klev) |
| 100 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
| 101 |
stephd |
1.12 |
surfphos(i,j) = PTR_PO4(i,j,klev) |
| 102 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
| 103 |
stephd |
1.27 |
#endif |
| 104 |
stephd |
1.1 |
#else |
| 105 |
dfer |
1.15 |
surfalk(i,j) = 2.366595 _d 0 * salt(i,j,kLev,bi,bj)/gsm_s |
| 106 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
| 107 |
dfer |
1.15 |
surfphos(i,j) = 5.1225 _d -4 * maskC(i,j,kLev,bi,bj) |
| 108 |
stephd |
1.1 |
#endif |
| 109 |
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C FOR NON-INTERACTIVE Si |
| 110 |
stephd |
1.3 |
surfsi(i,j) = SILICA(i,j,bi,bj) * maskC(i,j,kLev,bi,bj) |
| 111 |
stephd |
1.27 |
#ifdef DIC_BOUNDS |
| 112 |
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surftemp(i,j) = max(-4. _d 0, |
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& min(50. _d 0, theta(i,j,kLev,bi,bj))) |
| 114 |
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surfsalt(i,j) = max(4. _d 0, |
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& min(50. _d 0, salt(i,j,kLev,bi,bj))) |
| 116 |
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surfdic(i,j) = max(0.4 _d 0, |
| 117 |
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& min(10. _d 0, PTR_CO2(i,j,kLev))) |
| 118 |
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#else |
| 119 |
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surftemp(i,j) = theta(i,j,kLev,bi,bj) |
| 120 |
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surfsalt(i,j) = salt(i,j,kLev,bi,bj) |
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surfdic(i,j) = PTR_CO2(i,j,kLev) |
| 122 |
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#endif |
| 123 |
stephd |
1.1 |
ENDDO |
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ENDDO |
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| 126 |
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CALL CARBON_COEFFS( |
| 127 |
stephd |
1.27 |
I surftemp,surfsalt, |
| 128 |
jmc |
1.22 |
I bi,bj,iMin,iMax,jMin,jMax,myThid) |
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stephd |
1.1 |
C==================================================================== |
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dfer |
1.17 |
DO j=jmin,jmax |
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DO i=imin,imax |
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C Compute AtmosP and Kwexch_Pre which are re-used for flux of O2 |
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| 135 |
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#ifdef USE_PLOAD |
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C Convert anomalous pressure pLoad (in Pa) from atmospheric model |
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C to total pressure (in Atm) |
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C Note: it is assumed the reference atmospheric pressure is 1Atm=1013mb |
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C rather than the actual ref. pressure from Atm. model so that on |
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C average AtmosP is about 1 Atm. |
| 141 |
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AtmosP(i,j,bi,bj)= 1. _d 0 + pLoad(i,j,bi,bj)/Pa2Atm |
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#endif |
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| 144 |
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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 |
| 146 |
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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,bi,bj) = pisvel(i,j) |
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& * (1. _d 0 - FIce(i,j,bi,bj)) |
| 149 |
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ENDDO |
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ENDDO |
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stephd |
1.1 |
c pCO2 solver... |
| 154 |
stephd |
1.3 |
C$TAF LOOP = parallel |
| 155 |
stephd |
1.10 |
DO j=jmin,jmax |
| 156 |
stephd |
1.3 |
C$TAF LOOP = parallel |
| 157 |
stephd |
1.10 |
DO i=imin,imax |
| 158 |
stephd |
1.1 |
|
| 159 |
dfer |
1.18 |
IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN |
| 160 |
stephd |
1.1 |
CALL CALC_PCO2_APPROX( |
| 161 |
stephd |
1.27 |
I surftemp(i,j),surfsalt(i,j), |
| 162 |
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I surfdic(i,j), surfphos(i,j), |
| 163 |
stephd |
1.1 |
I surfsi(i,j),surfalk(i,j), |
| 164 |
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I ak1(i,j,bi,bj),ak2(i,j,bi,bj), |
| 165 |
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I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj), |
| 166 |
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I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj), |
| 167 |
stephd |
1.25 |
I aksi(i,j,bi,bj),akf(i,j,bi,bj), |
| 168 |
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I ak0(i,j,bi,bj), fugf(i,j,bi,bj), |
| 169 |
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I ff(i,j,bi,bj), |
| 170 |
stephd |
1.1 |
I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj), |
| 171 |
dfer |
1.29 |
U pH(i,j,bi,bj),pCO2(i,j,bi,bj),co3dummy, |
| 172 |
jmc |
1.24 |
I i,j,kLev,bi,bj,myIter,myThid ) |
| 173 |
stephd |
1.1 |
ELSE |
| 174 |
dfer |
1.18 |
pCO2(i,j,bi,bj)=0. _d 0 |
| 175 |
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ENDIF |
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stephd |
1.1 |
ENDDO |
| 177 |
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ENDDO |
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| 179 |
stephd |
1.10 |
DO j=jmin,jmax |
| 180 |
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DO i=imin,imax |
| 181 |
stephd |
1.1 |
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| 182 |
dfer |
1.18 |
IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN |
| 183 |
stephd |
1.1 |
C calculate SCHMIDT NO. for CO2 |
| 184 |
jmc |
1.24 |
SchmidtNoDIC(i,j) = |
| 185 |
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& sca1 |
| 186 |
stephd |
1.1 |
& + sca2 * theta(i,j,kLev,bi,bj) |
| 187 |
jmc |
1.24 |
& + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
| 188 |
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& + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
| 189 |
stephd |
1.1 |
& *theta(i,j,kLev,bi,bj) |
| 190 |
jmc |
1.28 |
c make sure Schmidt number is not negative (will happen if temp>39C) |
| 191 |
stephd |
1.26 |
SchmidtNoDIC(i,j)=max(1.0 _d -2, SchmidtNoDIC(i,j)) |
| 192 |
stephd |
1.1 |
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| 193 |
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C Determine surface flux (FDIC) |
| 194 |
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C first correct pCO2at for surface atmos pressure |
| 195 |
jmc |
1.24 |
pCO2sat(i,j) = |
| 196 |
stephd |
1.1 |
& AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj) |
| 197 |
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| 198 |
dfer |
1.17 |
C then account for Schmidt number |
| 199 |
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Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj) |
| 200 |
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& / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0) |
| 201 |
stephd |
1.1 |
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| 202 |
stephd |
1.25 |
#ifdef WATERVAP_BUG |
| 203 |
stephd |
1.1 |
C Calculate flux in terms of DIC units using K0, solubility |
| 204 |
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C Flux = Vp * ([CO2sat] - [CO2]) |
| 205 |
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C CO2sat = K0*pCO2atmos*P/P0 |
| 206 |
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C Converting pCO2 to [CO2] using ff, as in CALC_PCO2 |
| 207 |
jmc |
1.24 |
FluxCO2(i,j,bi,bj) = |
| 208 |
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& Kwexch(i,j)*( |
| 209 |
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& ak0(i,j,bi,bj)*pCO2sat(i,j) - |
| 210 |
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& ff(i,j,bi,bj)*pCO2(i,j,bi,bj) |
| 211 |
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& ) |
| 212 |
stephd |
1.25 |
#else |
| 213 |
jmc |
1.28 |
C Corrected by Val Bennington Nov 2010 per G.A. McKinley s finding |
| 214 |
stephd |
1.25 |
C of error in application of water vapor correction |
| 215 |
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c Flux = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean) |
| 216 |
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FluxCO2(i,j,bi,bj) = |
| 217 |
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& Kwexch(i,j)*( |
| 218 |
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& ff(i,j,bi,bj)*pCO2sat(i,j) - |
| 219 |
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& pCO2(i,j,bi,bj)*fugf(i,j,bi,bj) |
| 220 |
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& *ak0(i,j,bi,bj) ) |
| 221 |
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& |
| 222 |
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#endif |
| 223 |
dfer |
1.18 |
ELSE |
| 224 |
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FluxCO2(i,j,bi,bj) = 0. _d 0 |
| 225 |
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ENDIF |
| 226 |
stephd |
1.1 |
C convert flux (mol kg-1 m s-1) to (mol m-2 s-1) |
| 227 |
stephd |
1.2 |
FluxCO2(i,j,bi,bj) = FluxCO2(i,j,bi,bj)/permil |
| 228 |
stephd |
1.1 |
|
| 229 |
dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
| 230 |
dfer |
1.18 |
IF (maskC(i,j,kLev,bi,bj).NE.0. _d 0) THEN |
| 231 |
stephd |
1.1 |
c calculate virtual flux |
| 232 |
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c EminusPforV = dS/dt*(1/Sglob) |
| 233 |
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C NOTE: Be very careful with signs here! |
| 234 |
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C Positive EminusPforV => loss of water to atmos and increase |
| 235 |
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C in salinity. Thus, also increase in other surface tracers |
| 236 |
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C (i.e. positive virtual flux into surface layer) |
| 237 |
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C ...so here, VirtualFLux = dC/dt! |
| 238 |
jmc |
1.7 |
VirtualFlux(i,j)=gsm_DIC*surfaceForcingS(i,j,bi,bj)/gsm_s |
| 239 |
stephd |
1.1 |
c OR |
| 240 |
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c let virtual flux be zero |
| 241 |
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c VirtualFlux(i,j)=0.d0 |
| 242 |
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c |
| 243 |
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ELSE |
| 244 |
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VirtualFlux(i,j)=0. _d 0 |
| 245 |
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ENDIF |
| 246 |
dfer |
1.16 |
#endif /* ALLOW_OLD_VIRTUALFLUX */ |
| 247 |
stephd |
1.1 |
ENDDO |
| 248 |
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ENDDO |
| 249 |
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| 250 |
jmc |
1.24 |
C update tendency |
| 251 |
stephd |
1.10 |
DO j=jmin,jmax |
| 252 |
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DO i=imin,imax |
| 253 |
dfer |
1.17 |
GDC(i,j)= recip_drF(kLev)*recip_hFacC(i,j,kLev,bi,bj) |
| 254 |
jmc |
1.24 |
& *(FluxCO2(i,j,bi,bj) |
| 255 |
dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
| 256 |
dfer |
1.17 |
& + VirtualFlux(i,j) |
| 257 |
dfer |
1.16 |
#endif |
| 258 |
dfer |
1.17 |
& ) |
| 259 |
stephd |
1.1 |
ENDDO |
| 260 |
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ENDDO |
| 261 |
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| 262 |
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#endif |
| 263 |
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RETURN |
| 264 |
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END |
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