/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.19 by stephd, Mon Nov 5 21:01:37 2007 UTC revision 1.28 by jmc, Fri Jun 24 01:35:32 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 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 57  C local variables for carbon chem Line 56  C local variables for carbon chem
56        _RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
57        _RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
58        _RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
59          _RL surftemp(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
60          _RL surfsalt(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
61          _RL surfdic(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
62  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
63        _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
64  #endif  #endif
# Line 85  C determine inorganic carbon chem coeffi Line 87  C determine inorganic carbon chem coeffi
87    
88  #ifdef DIC_BIOTIC  #ifdef DIC_BIOTIC
89  cQQQQ check ptracer numbers  cQQQQ check ptracer numbers
90    #ifdef DIC_BOUNDS
91                 surfalk(i,j) = max(0.4 _d 0,
92         &                          min(10. _d 0,PTR_ALK(i,j,klev)))
93         &                          * maskC(i,j,kLev,bi,bj)
94                 surfphos(i,j)  = max(1.0 _d -11,
95         &                          min(1._d -1, PTR_PO4(i,j,klev)))
96         &                          * maskC(i,j,kLev,bi,bj)
97    #else
98               surfalk(i,j) = PTR_ALK(i,j,klev)               surfalk(i,j) = PTR_ALK(i,j,klev)
99       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
100               surfphos(i,j)  = PTR_PO4(i,j,klev)               surfphos(i,j)  = PTR_PO4(i,j,klev)
101       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
102    #endif
103  #else  #else
104               surfalk(i,j) = 2.366595 _d 0 * salt(i,j,kLev,bi,bj)/gsm_s               surfalk(i,j) = 2.366595 _d 0 * salt(i,j,kLev,bi,bj)/gsm_s
105       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
# Line 96  cQQQQ check ptracer numbers Line 107  cQQQQ check ptracer numbers
107  #endif  #endif
108  C FOR NON-INTERACTIVE Si  C FOR NON-INTERACTIVE Si
109               surfsi(i,j)   = SILICA(i,j,bi,bj) * maskC(i,j,kLev,bi,bj)               surfsi(i,j)   = SILICA(i,j,bi,bj) * maskC(i,j,kLev,bi,bj)
110    #ifdef DIC_BOUNDS
111                surftemp(i,j) = max(-4. _d 0,
112         &                          min(50. _d 0, theta(i,j,kLev,bi,bj)))
113                surfsalt(i,j) = max(4. _d 0,
114         &                          min(50. _d 0, salt(i,j,kLev,bi,bj)))
115                surfdic(i,j)  = max(0.4 _d 0,
116         &                          min(10. _d 0, PTR_CO2(i,j,kLev)))
117    #else
118                surftemp(i,j) = theta(i,j,kLev,bi,bj)
119                surfsalt(i,j) = salt(i,j,kLev,bi,bj)
120                surfdic(i,j)  = PTR_CO2(i,j,kLev)
121    #endif
122            ENDDO            ENDDO
123           ENDDO           ENDDO
124    
125           CALL CARBON_COEFFS(           CALL CARBON_COEFFS(
126       I                       theta,salt,       I                       surftemp,surfsalt,
127       I                       bi,bj,iMin,iMax,jMin,jMax)       I                       bi,bj,iMin,iMax,jMin,jMax,myThid)
128  C====================================================================  C====================================================================
129    
130         DO j=jmin,jmax         DO j=jmin,jmax
# Line 134  C$TAF LOOP = parallel Line 157  C$TAF LOOP = parallel
157    
158            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
159              CALL CALC_PCO2_APPROX(              CALL CALC_PCO2_APPROX(
160       I        theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj),       I        surftemp(i,j),surfsalt(i,j),
161       I        PTR_CO2(i,j,kLev), surfphos(i,j),       I        surfdic(i,j), surfphos(i,j),
162       I        surfsi(i,j),surfalk(i,j),       I        surfsi(i,j),surfalk(i,j),
163       I        ak1(i,j,bi,bj),ak2(i,j,bi,bj),       I        ak1(i,j,bi,bj),ak2(i,j,bi,bj),
164       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),
165       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),
166       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),
167         I        ak0(i,j,bi,bj), fugf(i,j,bi,bj),
168         I        ff(i,j,bi,bj),
169       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),
170       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj) )       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj),
171         I        i,j,kLev,bi,bj,myIter,myThid )
172            ELSE            ELSE
173              pCO2(i,j,bi,bj)=0. _d 0              pCO2(i,j,bi,bj)=0. _d 0
174            ENDIF            ENDIF
# Line 154  C$TAF LOOP = parallel Line 180  C$TAF LOOP = parallel
180    
181            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
182  C calculate SCHMIDT NO. for CO2  C calculate SCHMIDT NO. for CO2
183                SchmidtNoDIC(i,j) =                SchmidtNoDIC(i,j) =
184       &            sca1       &            sca1
185       &          + sca2 * theta(i,j,kLev,bi,bj)       &          + sca2 * theta(i,j,kLev,bi,bj)
186       &          + 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)
187       &          + 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)
188       &                *theta(i,j,kLev,bi,bj)       &                *theta(i,j,kLev,bi,bj)
189    c make sure Schmidt number is not negative (will happen if temp>39C)
190                 SchmidtNoDIC(i,j)=max(1.0 _d -2, SchmidtNoDIC(i,j))
191    
192  C Determine surface flux (FDIC)  C Determine surface flux (FDIC)
193  C first correct pCO2at for surface atmos pressure  C first correct pCO2at for surface atmos pressure
194                pCO2sat(i,j) =                pCO2sat(i,j) =
195       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
196    
197  C then account for Schmidt number  C then account for Schmidt number
198                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)                Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)
199       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)       &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)
200    
201    #ifdef WATERVAP_BUG
202  C Calculate flux in terms of DIC units using K0, solubility  C Calculate flux in terms of DIC units using K0, solubility
203  C Flux = Vp * ([CO2sat] - [CO2])  C Flux = Vp * ([CO2sat] - [CO2])
204  C CO2sat = K0*pCO2atmos*P/P0  C CO2sat = K0*pCO2atmos*P/P0
205  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2  C Converting pCO2 to [CO2] using ff, as in CALC_PCO2
206                FluxCO2(i,j,bi,bj) =                FluxCO2(i,j,bi,bj) =
207       &         Kwexch(i,j)*(       &         Kwexch(i,j)*(
208       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -       &         ak0(i,j,bi,bj)*pCO2sat(i,j) -
209       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)       &         ff(i,j,bi,bj)*pCO2(i,j,bi,bj)
210       &         )       &         )
211    #else
212    C Corrected by Val Bennington Nov 2010 per G.A. McKinley s finding
213    C of error in application of water vapor correction
214    c Flux = kw*rho*(ff*pCO2atm-k0*FugFac*pCO2ocean)
215                   FluxCO2(i,j,bi,bj) =
216         &          Kwexch(i,j)*(
217         &            ff(i,j,bi,bj)*pCO2sat(i,j) -
218         &            pCO2(i,j,bi,bj)*fugf(i,j,bi,bj)
219         &            *ak0(i,j,bi,bj) )
220         &
221    #endif
222            ELSE            ELSE
223                FluxCO2(i,j,bi,bj) = 0. _d 0                FluxCO2(i,j,bi,bj) = 0. _d 0
224            ENDIF            ENDIF
# Line 206  c Line 246  c
246            ENDDO            ENDDO
247           ENDDO           ENDDO
248    
249  C update tendency        C update tendency
250           DO j=jmin,jmax           DO j=jmin,jmax
251            DO i=imin,imax            DO i=imin,imax
252             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)
253       &              *(FluxCO2(i,j,bi,bj)       &              *(FluxCO2(i,j,bi,bj)
254  #ifdef ALLOW_OLD_VIRTUALFLUX  #ifdef ALLOW_OLD_VIRTUALFLUX
255       &              + VirtualFlux(i,j)       &              + VirtualFlux(i,j)
256  #endif  #endif
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