/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.23 by jmc, Sun Apr 11 22:03:53 2010 UTC revision 1.26 by stephd, Thu May 5 21:31:58 2011 UTC
# Line 8  CBOP Line 8  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 139  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        myThid )       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    c make sure Schmidt number isn't negative (will happen if temp>39C)
166                 SchmidtNoDIC(i,j)=max(1.0 _d -2, SchmidtNoDIC(i,j))
167    
168  C Determine surface flux (FDIC)  C Determine surface flux (FDIC)
169  C first correct pCO2at for surface atmos pressure  C first correct pCO2at for surface atmos pressure
170                pCO2sat(i,j) =                pCO2sat(i,j) =
171       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
172    
173  C then account for Schmidt number  C then account for Schmidt number
174                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)
175       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)
176    
177    #ifdef WATERVAP_BUG
178  C Calculate flux in terms of DIC units using K0, solubility  C Calculate flux in terms of DIC units using K0, solubility
179  C Flux = Vp * ([CO2sat] - [CO2])  C Flux = Vp * ([CO2sat] - [CO2])
180  C CO2sat = K0*pCO2atmos*P/P0  C CO2sat = K0*pCO2atmos*P/P0
181  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2
182                FluxCO2(i,j,bi,bj) =                FluxCO2(i,j,bi,bj) =
183       &         Kwexch(i,j)*(       &         Kwexch(i,j)*(
184       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -
185       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)
186       &         )       &         )
187    #else
188    C Corrected by Val Bennington Nov 2010 per G.A. McKinley's finding
189    C of error in application of water vapor correction
190    c Flux = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean)
191                   FluxCO2(i,j,bi,bj) =
192         &          Kwexch(i,j)*(
193         &            ff(i,j,bi,bj)*pCO2sat(i,j) -
194         &            pCO2(i,j,bi,bj)*fugf(i,j,bi,bj)
195         &            *ak0(i,j,bi,bj) )
196         &
197    #endif
198            ELSE            ELSE
199                FluxCO2(i,j,bi,bj) = 0. _d 0                FluxCO2(i,j,bi,bj) = 0. _d 0
200            ENDIF            ENDIF
# Line 206  c Line 222  c
222            ENDDO            ENDDO
223           ENDDO           ENDDO
224    
225  C update tendency        C update tendency
226           DO j=jmin,jmax           DO j=jmin,jmax
227            DO i=imin,imax            DO i=imin,imax
228             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)
229       &              *(FluxCO2(i,j,bi,bj)       &              *(FluxCO2(i,j,bi,bj)
230  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
231       &              + VirtualFlux(i,j)       &              + VirtualFlux(i,j)
232  #endif  #endif
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