1 |
jmc |
1.30 |
C $Header: /u/gcmpack/MITgcm/pkg/dic/dic_surfforcing.F,v 1.29 2011/10/07 21:36:39 dfer Exp $ |
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jmc |
1.6 |
C $Name: $ |
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4 |
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, |
12 |
jmc |
1.30 |
I bi,bj,iMin,iMax,jMin,jMax, |
13 |
stephd |
1.1 |
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 |
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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" |
27 |
dfer |
1.20 |
#include "DIC_VARS.h" |
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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 |
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_RL myTime |
36 |
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_RL PTR_CO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
37 |
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 |
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stephd |
1.5 |
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C !LOCAL VARIABLES: ==================================================== |
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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) |
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dfer |
1.17 |
_RL pisvel(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
56 |
stephd |
1.1 |
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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stephd |
1.27 |
_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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dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
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stephd |
1.1 |
_RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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dfer |
1.16 |
#endif |
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stephd |
1.5 |
CEOP |
67 |
stephd |
1.1 |
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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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C ================================================================= |
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C determine inorganic carbon chem coefficients |
85 |
jmc |
1.30 |
DO j=jMin,jMax |
86 |
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DO i=iMin,iMax |
87 |
stephd |
1.1 |
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#ifdef DIC_BIOTIC |
89 |
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cQQQQ check ptracer numbers |
90 |
stephd |
1.27 |
#ifdef DIC_BOUNDS |
91 |
jmc |
1.30 |
surfalk(i,j) = max(0.4 _d 0, |
92 |
stephd |
1.27 |
& min(10. _d 0,PTR_ALK(i,j,klev))) |
93 |
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& * maskC(i,j,kLev,bi,bj) |
94 |
jmc |
1.30 |
surfphos(i,j) = max(1.0 _d -11, |
95 |
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& min(1. _d -1,PTR_PO4(i,j,klev))) |
96 |
stephd |
1.27 |
& * maskC(i,j,kLev,bi,bj) |
97 |
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#else |
98 |
stephd |
1.12 |
surfalk(i,j) = PTR_ALK(i,j,klev) |
99 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
100 |
stephd |
1.12 |
surfphos(i,j) = PTR_PO4(i,j,klev) |
101 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
102 |
stephd |
1.27 |
#endif |
103 |
stephd |
1.1 |
#else |
104 |
dfer |
1.15 |
surfalk(i,j) = 2.366595 _d 0 * salt(i,j,kLev,bi,bj)/gsm_s |
105 |
stephd |
1.1 |
& * maskC(i,j,kLev,bi,bj) |
106 |
dfer |
1.15 |
surfphos(i,j) = 5.1225 _d -4 * maskC(i,j,kLev,bi,bj) |
107 |
stephd |
1.1 |
#endif |
108 |
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C FOR NON-INTERACTIVE Si |
109 |
stephd |
1.3 |
surfsi(i,j) = SILICA(i,j,bi,bj) * maskC(i,j,kLev,bi,bj) |
110 |
stephd |
1.27 |
#ifdef DIC_BOUNDS |
111 |
jmc |
1.30 |
surftemp(i,j) = max(-4. _d 0, |
112 |
stephd |
1.27 |
& min(50. _d 0, theta(i,j,kLev,bi,bj))) |
113 |
jmc |
1.30 |
surfsalt(i,j) = max(4. _d 0, |
114 |
stephd |
1.27 |
& min(50. _d 0, salt(i,j,kLev,bi,bj))) |
115 |
jmc |
1.30 |
surfdic(i,j) = max(0.4 _d 0, |
116 |
stephd |
1.27 |
& min(10. _d 0, PTR_CO2(i,j,kLev))) |
117 |
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#else |
118 |
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surftemp(i,j) = theta(i,j,kLev,bi,bj) |
119 |
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surfsalt(i,j) = salt(i,j,kLev,bi,bj) |
120 |
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surfdic(i,j) = PTR_CO2(i,j,kLev) |
121 |
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#endif |
122 |
stephd |
1.1 |
ENDDO |
123 |
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ENDDO |
124 |
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125 |
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CALL CARBON_COEFFS( |
126 |
stephd |
1.27 |
I surftemp,surfsalt, |
127 |
jmc |
1.22 |
I bi,bj,iMin,iMax,jMin,jMax,myThid) |
128 |
stephd |
1.1 |
C==================================================================== |
129 |
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130 |
jmc |
1.30 |
DO j=jMin,jMax |
131 |
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DO i=iMin,iMax |
132 |
dfer |
1.17 |
C Compute AtmosP and Kwexch_Pre which are re-used for flux of O2 |
133 |
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134 |
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#ifdef USE_PLOAD |
135 |
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C Convert anomalous pressure pLoad (in Pa) from atmospheric model |
136 |
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C to total pressure (in Atm) |
137 |
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C Note: it is assumed the reference atmospheric pressure is 1Atm=1013mb |
138 |
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C rather than the actual ref. pressure from Atm. model so that on |
139 |
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C average AtmosP is about 1 Atm. |
140 |
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AtmosP(i,j,bi,bj)= 1. _d 0 + pLoad(i,j,bi,bj)/Pa2Atm |
141 |
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#endif |
142 |
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143 |
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C Pre-compute part of exchange coefficient: pisvel*(1-fice) |
144 |
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C Schmidt number is accounted for later |
145 |
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pisvel(i,j)=0.337 _d 0 *wind(i,j,bi,bj)**2/3.6 _d 5 |
146 |
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Kwexch_Pre(i,j,bi,bj) = pisvel(i,j) |
147 |
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& * (1. _d 0 - FIce(i,j,bi,bj)) |
148 |
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149 |
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ENDDO |
150 |
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ENDDO |
151 |
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152 |
stephd |
1.1 |
c pCO2 solver... |
153 |
stephd |
1.3 |
C$TAF LOOP = parallel |
154 |
jmc |
1.30 |
DO j=jMin,jMax |
155 |
stephd |
1.3 |
C$TAF LOOP = parallel |
156 |
jmc |
1.30 |
DO i=iMin,iMax |
157 |
stephd |
1.1 |
|
158 |
dfer |
1.18 |
IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN |
159 |
stephd |
1.1 |
CALL CALC_PCO2_APPROX( |
160 |
stephd |
1.27 |
I surftemp(i,j),surfsalt(i,j), |
161 |
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I surfdic(i,j), surfphos(i,j), |
162 |
stephd |
1.1 |
I surfsi(i,j),surfalk(i,j), |
163 |
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I ak1(i,j,bi,bj),ak2(i,j,bi,bj), |
164 |
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I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj), |
165 |
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I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj), |
166 |
stephd |
1.25 |
I aksi(i,j,bi,bj),akf(i,j,bi,bj), |
167 |
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I ak0(i,j,bi,bj), fugf(i,j,bi,bj), |
168 |
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I ff(i,j,bi,bj), |
169 |
stephd |
1.1 |
I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj), |
170 |
dfer |
1.29 |
U pH(i,j,bi,bj),pCO2(i,j,bi,bj),co3dummy, |
171 |
jmc |
1.24 |
I i,j,kLev,bi,bj,myIter,myThid ) |
172 |
stephd |
1.1 |
ELSE |
173 |
dfer |
1.18 |
pCO2(i,j,bi,bj)=0. _d 0 |
174 |
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ENDIF |
175 |
stephd |
1.1 |
ENDDO |
176 |
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ENDDO |
177 |
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178 |
jmc |
1.30 |
DO j=jMin,jMax |
179 |
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DO i=iMin,iMax |
180 |
stephd |
1.1 |
|
181 |
dfer |
1.18 |
IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN |
182 |
stephd |
1.1 |
C calculate SCHMIDT NO. for CO2 |
183 |
jmc |
1.24 |
SchmidtNoDIC(i,j) = |
184 |
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& sca1 |
185 |
stephd |
1.1 |
& + sca2 * theta(i,j,kLev,bi,bj) |
186 |
jmc |
1.24 |
& + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
187 |
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& + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj) |
188 |
stephd |
1.1 |
& *theta(i,j,kLev,bi,bj) |
189 |
jmc |
1.28 |
c make sure Schmidt number is not negative (will happen if temp>39C) |
190 |
stephd |
1.26 |
SchmidtNoDIC(i,j)=max(1.0 _d -2, SchmidtNoDIC(i,j)) |
191 |
stephd |
1.1 |
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192 |
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C Determine surface flux (FDIC) |
193 |
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C first correct pCO2at for surface atmos pressure |
194 |
jmc |
1.24 |
pCO2sat(i,j) = |
195 |
stephd |
1.1 |
& AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj) |
196 |
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197 |
dfer |
1.17 |
C then account for Schmidt number |
198 |
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Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj) |
199 |
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& / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0) |
200 |
stephd |
1.1 |
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201 |
stephd |
1.25 |
#ifdef WATERVAP_BUG |
202 |
stephd |
1.1 |
C Calculate flux in terms of DIC units using K0, solubility |
203 |
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C Flux = Vp * ([CO2sat] - [CO2]) |
204 |
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C CO2sat = K0*pCO2atmos*P/P0 |
205 |
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C Converting pCO2 to [CO2] using ff, as in CALC_PCO2 |
206 |
jmc |
1.24 |
FluxCO2(i,j,bi,bj) = |
207 |
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& Kwexch(i,j)*( |
208 |
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& ak0(i,j,bi,bj)*pCO2sat(i,j) - |
209 |
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& ff(i,j,bi,bj)*pCO2(i,j,bi,bj) |
210 |
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& ) |
211 |
stephd |
1.25 |
#else |
212 |
jmc |
1.28 |
C Corrected by Val Bennington Nov 2010 per G.A. McKinley s finding |
213 |
stephd |
1.25 |
C of error in application of water vapor correction |
214 |
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c Flux = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean) |
215 |
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FluxCO2(i,j,bi,bj) = |
216 |
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& Kwexch(i,j)*( |
217 |
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& ff(i,j,bi,bj)*pCO2sat(i,j) - |
218 |
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& pCO2(i,j,bi,bj)*fugf(i,j,bi,bj) |
219 |
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& *ak0(i,j,bi,bj) ) |
220 |
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& |
221 |
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#endif |
222 |
dfer |
1.18 |
ELSE |
223 |
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FluxCO2(i,j,bi,bj) = 0. _d 0 |
224 |
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ENDIF |
225 |
stephd |
1.1 |
C convert flux (mol kg-1 m s-1) to (mol m-2 s-1) |
226 |
stephd |
1.2 |
FluxCO2(i,j,bi,bj) = FluxCO2(i,j,bi,bj)/permil |
227 |
stephd |
1.1 |
|
228 |
dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
229 |
dfer |
1.18 |
IF (maskC(i,j,kLev,bi,bj).NE.0. _d 0) THEN |
230 |
stephd |
1.1 |
c calculate virtual flux |
231 |
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c EminusPforV = dS/dt*(1/Sglob) |
232 |
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C NOTE: Be very careful with signs here! |
233 |
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C Positive EminusPforV => loss of water to atmos and increase |
234 |
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C in salinity. Thus, also increase in other surface tracers |
235 |
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C (i.e. positive virtual flux into surface layer) |
236 |
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C ...so here, VirtualFLux = dC/dt! |
237 |
jmc |
1.7 |
VirtualFlux(i,j)=gsm_DIC*surfaceForcingS(i,j,bi,bj)/gsm_s |
238 |
stephd |
1.1 |
c OR |
239 |
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c let virtual flux be zero |
240 |
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c VirtualFlux(i,j)=0.d0 |
241 |
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c |
242 |
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ELSE |
243 |
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VirtualFlux(i,j)=0. _d 0 |
244 |
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ENDIF |
245 |
dfer |
1.16 |
#endif /* ALLOW_OLD_VIRTUALFLUX */ |
246 |
stephd |
1.1 |
ENDDO |
247 |
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ENDDO |
248 |
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249 |
jmc |
1.24 |
C update tendency |
250 |
jmc |
1.30 |
DO j=jMin,jMax |
251 |
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DO i=iMin,iMax |
252 |
dfer |
1.17 |
GDC(i,j)= recip_drF(kLev)*recip_hFacC(i,j,kLev,bi,bj) |
253 |
jmc |
1.24 |
& *(FluxCO2(i,j,bi,bj) |
254 |
dfer |
1.16 |
#ifdef ALLOW_OLD_VIRTUALFLUX |
255 |
dfer |
1.17 |
& + VirtualFlux(i,j) |
256 |
dfer |
1.16 |
#endif |
257 |
dfer |
1.17 |
& ) |
258 |
stephd |
1.1 |
ENDDO |
259 |
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ENDDO |
260 |
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261 |
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#endif |
262 |
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RETURN |
263 |
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END |