/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.17 by dfer, Tue Aug 28 02:30:31 2007 UTC revision 1.24 by jmc, Mon Apr 12 20:07:57 2010 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 25  C !USES: =============================== Line 24  C !USES: ===============================
24  #include "PARAMS.h"  #include "PARAMS.h"
25  #include "GRID.h"  #include "GRID.h"
26  #include "FFIELDS.h"  #include "FFIELDS.h"
27  #include "DIC_ABIOTIC.h"  #include "DIC_VARS.h"
28    
29  C !INPUT PARAMETERS: ===================================================  C !INPUT PARAMETERS: ===================================================
30  C  myThid               :: thread number  C  myThid               :: thread number
# 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 66  cccccccccccccccccccccccccccccccccccccccc Line 65  cccccccccccccccccccccccccccccccccccccccc
65    
66        kLev=1        kLev=1
67    
68  c if coupled to atmsopheric model, use the  cc if coupled to atmsopheric model, use the
69  c Co2 value passed from the coupler  cc Co2 value passed from the coupler
70  #ifndef USE_ATMOSCO2  c#ifndef USE_ATMOSCO2
71  C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv  cC PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv
72         DO j=1-OLy,sNy+OLy  c       DO j=1-OLy,sNy+OLy
73          DO i=1-OLx,sNx+OLx  c        DO i=1-OLx,sNx+OLx
74             AtmospCO2(i,j,bi,bj)=278.0 _d -6  c           AtmospCO2(i,j,bi,bj)=278.0 _d -6
75          ENDDO  c        ENDDO
76         ENDDO  c       ENDDO
77  #endif  c#endif
78    
79    
80  C =================================================================  C =================================================================
# 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 132  C$TAF LOOP = parallel Line 131  C$TAF LOOP = parallel
131  C$TAF LOOP = parallel  C$TAF LOOP = parallel
132          DO i=imin,imax          DO i=imin,imax
133    
134            IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
135              CALL CALC_PCO2_APPROX(              CALL CALC_PCO2_APPROX(
136       I        theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj),       I        theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj),
137       I        PTR_CO2(i,j,kLev), surfphos(i,j),       I        PTR_CO2(i,j,kLev), surfphos(i,j),
# Line 142  C$TAF LOOP = parallel Line 141  C$TAF LOOP = parallel
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),ff(i,j,bi,bj),
143       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),
144       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj) )       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj),
145         I        i,j,kLev,bi,bj,myIter,myThid )
146            ELSE            ELSE
147               pCO2(i,j,bi,bj)=0. _d 0              pCO2(i,j,bi,bj)=0. _d 0
148            END IF            ENDIF
149          ENDDO          ENDDO
150         ENDDO         ENDDO
151    
152         DO j=jmin,jmax         DO j=jmin,jmax
153          DO i=imin,imax          DO i=imin,imax
154    
155              IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
156  C calculate SCHMIDT NO. for CO2  C calculate SCHMIDT NO. for CO2
157                SchmidtNoDIC(i,j) =                SchmidtNoDIC(i,j) =
158       &            sca1       &            sca1
159       &          + sca2 * theta(i,j,kLev,bi,bj)       &          + sca2 * theta(i,j,kLev,bi,bj)
160       &          + 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)
161       &          + 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)
162       &                *theta(i,j,kLev,bi,bj)       &                *theta(i,j,kLev,bi,bj)
163    
164  C Determine surface flux (FDIC)  C Determine surface flux (FDIC)
165  C first correct pCO2at for surface atmos pressure  C first correct pCO2at for surface atmos pressure
166                pCO2sat(i,j) =                pCO2sat(i,j) =
167       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
168    
169  C then account for Schmidt number  C then account for Schmidt number
# Line 174  C Calculate flux in terms of DIC units u Line 174  C Calculate flux in terms of DIC units u
174  C Flux = Vp * ([CO2sat] - [CO2])  C Flux = Vp * ([CO2sat] - [CO2])
175  C CO2sat = K0*pCO2atmos*P/P0  C CO2sat = K0*pCO2atmos*P/P0
176  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2
177                FluxCO2(i,j,bi,bj) =                FluxCO2(i,j,bi,bj) =
178       &         Kwexch(i,j)*(       &         Kwexch(i,j)*(
179       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -
180       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)
181       &         )       &         )
182              ELSE            ELSE
183                 FluxCO2(i,j,bi,bj) = 0. _d 0                FluxCO2(i,j,bi,bj) = 0. _d 0
184              ENDIF            ENDIF
185  C convert flux (mol kg-1 m s-1) to (mol m-2 s-1)  C convert flux (mol kg-1 m s-1) to (mol m-2 s-1)
186              FluxCO2(i,j,bi,bj) = FluxCO2(i,j,bi,bj)/permil              FluxCO2(i,j,bi,bj) = FluxCO2(i,j,bi,bj)/permil
187    
188  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
189              IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN              IF (maskC(i,j,kLev,bi,bj).NE.0. _d 0) THEN
190  c calculate virtual flux  c calculate virtual flux
191  c EminusPforV = dS/dt*(1/Sglob)  c EminusPforV = dS/dt*(1/Sglob)
192  C NOTE: Be very careful with signs here!  C NOTE: Be very careful with signs here!
# Line 206  c Line 206  c
206            ENDDO            ENDDO
207           ENDDO           ENDDO
208    
209  C update tendency        C update tendency
210           DO j=jmin,jmax           DO j=jmin,jmax
211            DO i=imin,imax            DO i=imin,imax
212             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)
213       &              *(FluxCO2(i,j,bi,bj)       &              *(FluxCO2(i,j,bi,bj)
214  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
215       &              + VirtualFlux(i,j)       &              + VirtualFlux(i,j)
216  #endif  #endif
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