/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.20 by dfer, Fri Apr 4 21:37:06 2008 UTC revision 1.25 by stephd, Tue Apr 19 21:34:32 2011 UTC
# Line 3  C $Name$ Line 3  C $Name$
3    
4  #include "DIC_OPTIONS.h"  #include "DIC_OPTIONS.h"
5  #include "PTRACERS_OPTIONS.h"  #include "PTRACERS_OPTIONS.h"
 #include "GCHEM_OPTIONS.h"  
6    
7  CBOP  CBOP
8  C !ROUTINE: DIC_SURFFORCING  C !ROUTINE: DIC_SURFFORCING
9    
10  C !INTERFACE: ==========================================================  C !INTERFACE: ==========================================================
11        SUBROUTINE DIC_SURFFORCING( PTR_CO2 , PTR_ALK, PTR_PO4, GDC,        SUBROUTINE DIC_SURFFORCING( PTR_CO2 , PTR_ALK, PTR_PO4, GDC,
12       I           bi,bj,imin,imax,jmin,jmax,       I           bi,bj,imin,imax,jmin,jmax,
13       I           myIter,myTime,myThid)       I           myIter,myTime,myThid)
14    
15  C !DESCRIPTION:  C !DESCRIPTION:
16  C  Calculate the carbon air-sea flux terms                C  Calculate the carbon air-sea flux terms
17  C  following external_forcing_dic.F (OCMIP run) from Mick              C  following external_forcing_dic.F (OCMIP run) from Mick
18    
19  C !USES: ===============================================================  C !USES: ===============================================================
20        IMPLICIT NONE        IMPLICIT NONE
# Line 46  c GDC                   :: tendency due Line 45  c GDC                   :: tendency due
45  #ifdef ALLOW_PTRACERS  #ifdef ALLOW_PTRACERS
46    
47  C !LOCAL VARIABLES: ====================================================  C !LOCAL VARIABLES: ====================================================
48         INTEGER I,J, kLev, it         INTEGER i,j, kLev
49  C Number of iterations for pCO2 solvers...  C Number of iterations for pCO2 solvers...
50  C Solubility relation coefficients  C Solubility relation coefficients
51        _RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
# Line 101  C FOR NON-INTERACTIVE Si Line 100  C FOR NON-INTERACTIVE Si
100    
101           CALL CARBON_COEFFS(           CALL CARBON_COEFFS(
102       I                       theta,salt,       I                       theta,salt,
103       I                       bi,bj,iMin,iMax,jMin,jMax)       I                       bi,bj,iMin,iMax,jMin,jMax,myThid)
104  C====================================================================  C====================================================================
105    
106         DO j=jmin,jmax         DO j=jmin,jmax
# Line 140  C$TAF LOOP = parallel Line 139  C$TAF LOOP = parallel
139       I        ak1(i,j,bi,bj),ak2(i,j,bi,bj),       I        ak1(i,j,bi,bj),ak2(i,j,bi,bj),
140       I        ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj),       I        ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj),
141       I        aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj),       I        aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj),
142       I        aksi(i,j,bi,bj),akf(i,j,bi,bj),ff(i,j,bi,bj),       I        aksi(i,j,bi,bj),akf(i,j,bi,bj),
143         I        ak0(i,j,bi,bj), fugf(i,j,bi,bj),
144         I        ff(i,j,bi,bj),
145       I        bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj),       I        bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj),
146       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj) )       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj),
147         I        i,j,kLev,bi,bj,myIter,myThid )
148            ELSE            ELSE
149              pCO2(i,j,bi,bj)=0. _d 0              pCO2(i,j,bi,bj)=0. _d 0
150            ENDIF            ENDIF
# Line 154  C$TAF LOOP = parallel Line 156  C$TAF LOOP = parallel
156    
157            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
158  C calculate SCHMIDT NO. for CO2  C calculate SCHMIDT NO. for CO2
159                SchmidtNoDIC(i,j) =                SchmidtNoDIC(i,j) =
160       &            sca1       &            sca1
161       &          + sca2 * theta(i,j,kLev,bi,bj)       &          + sca2 * theta(i,j,kLev,bi,bj)
162       &          + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)         &          + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)
163       &          + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)       &          + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)
164       &                *theta(i,j,kLev,bi,bj)       &                *theta(i,j,kLev,bi,bj)
165    
166  C Determine surface flux (FDIC)  C Determine surface flux (FDIC)
167  C first correct pCO2at for surface atmos pressure  C first correct pCO2at for surface atmos pressure
168                pCO2sat(i,j) =                pCO2sat(i,j) =
169       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
170    
171  C then account for Schmidt number  C then account for Schmidt number
172                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)
173       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)
174    
175    #ifdef WATERVAP_BUG
176  C Calculate flux in terms of DIC units using K0, solubility  C Calculate flux in terms of DIC units using K0, solubility
177  C Flux = Vp * ([CO2sat] - [CO2])  C Flux = Vp * ([CO2sat] - [CO2])
178  C CO2sat = K0*pCO2atmos*P/P0  C CO2sat = K0*pCO2atmos*P/P0
179  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2
180                FluxCO2(i,j,bi,bj) =                FluxCO2(i,j,bi,bj) =
181       &         Kwexch(i,j)*(       &         Kwexch(i,j)*(
182       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -
183       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)
184       &         )       &         )
185    #else
186    C Corrected by Val Bennington Nov 2010 per G.A. McKinley's finding
187    C of error in application of water vapor correction
188    c Flux = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean)
189                   FluxCO2(i,j,bi,bj) =
190         &          Kwexch(i,j)*(
191         &            ff(i,j,bi,bj)*pCO2sat(i,j) -
192         &            pCO2(i,j,bi,bj)*fugf(i,j,bi,bj)
193         &            *ak0(i,j,bi,bj) )
194         &
195    #endif
196            ELSE            ELSE
197                FluxCO2(i,j,bi,bj) = 0. _d 0                FluxCO2(i,j,bi,bj) = 0. _d 0
198            ENDIF            ENDIF
# Line 206  c Line 220  c
220            ENDDO            ENDDO
221           ENDDO           ENDDO
222    
223  C update tendency        C update tendency
224           DO j=jmin,jmax           DO j=jmin,jmax
225            DO i=imin,imax            DO i=imin,imax
226             GDC(i,j)= recip_drF(kLev)*recip_hFacC(i,j,kLev,bi,bj)             GDC(i,j)= recip_drF(kLev)*recip_hFacC(i,j,kLev,bi,bj)
227       &              *(FluxCO2(i,j,bi,bj)       &              *(FluxCO2(i,j,bi,bj)
228  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
229       &              + VirtualFlux(i,j)       &              + VirtualFlux(i,j)
230  #endif  #endif
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