/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.8 by stephd, Fri Aug 6 19:50:52 2004 UTC revision 1.20 by dfer, Fri Apr 4 21:37:06 2008 UTC
# Line 9  CBOP Line 9  CBOP
9  C !ROUTINE: DIC_SURFFORCING  C !ROUTINE: DIC_SURFFORCING
10    
11  C !INTERFACE: ==========================================================  C !INTERFACE: ==========================================================
12        SUBROUTINE DIC_SURFFORCING( PTR_CO2 , GDC,        SUBROUTINE DIC_SURFFORCING( PTR_CO2 , PTR_ALK, PTR_PO4, GDC,
13       I           bi,bj,imin,imax,jmin,jmax,       I           bi,bj,imin,imax,jmin,jmax,
14       I           myIter,myTime,myThid)       I           myIter,myTime,myThid)
15    
# Line 25  C !USES: =============================== Line 25  C !USES: ===============================
25  #include "PARAMS.h"  #include "PARAMS.h"
26  #include "GRID.h"  #include "GRID.h"
27  #include "FFIELDS.h"  #include "FFIELDS.h"
28  #include "DIC_ABIOTIC.h"  #include "DIC_VARS.h"
 #ifdef DIC_BIOTIC  
 #include "PTRACERS_SIZE.h"  
 #include "PTRACERS.h"  
 #endif  
29    
30  C !INPUT PARAMETERS: ===================================================  C !INPUT PARAMETERS: ===================================================
31  C  myThid               :: thread number  C  myThid               :: thread number
# Line 39  c  PTR_CO2              :: DIC tracer fi Line 35  c  PTR_CO2              :: DIC tracer fi
35        INTEGER myIter, myThid        INTEGER myIter, myThid
36        _RL myTime        _RL myTime
37        _RL  PTR_CO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)        _RL  PTR_CO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
38          _RL  PTR_ALK(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
39          _RL  PTR_PO4(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
40        INTEGER iMin,iMax,jMin,jMax, bi, bj        INTEGER iMin,iMax,jMin,jMax, bi, bj
41    
42  C !OUTPUT PARAMETERS: ===================================================  C !OUTPUT PARAMETERS: ===================================================
# Line 54  C Solubility relation coefficients Line 52  C Solubility relation coefficients
52        _RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
53        _RL pCO2sat(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL pCO2sat(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
54        _RL Kwexch(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL Kwexch(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
55          _RL pisvel(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
56  C local variables for carbon chem  C local variables for carbon chem
57        _RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
58        _RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
59        _RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
60    #ifdef ALLOW_OLD_VIRTUALFLUX
61        _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
62    #endif
63  CEOP  CEOP
64    
65  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
66    
67        kLev=1        kLev=1
68    
69  C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv  cc if coupled to atmsopheric model, use the
70         DO j=1-OLy,sNy+OLy  cc Co2 value passed from the coupler
71          DO i=1-OLx,sNx+OLx  c#ifndef USE_ATMOSCO2
72             AtmospCO2(i,j,bi,bj)=278.0d-6  cC PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv
73          ENDDO  c       DO j=1-OLy,sNy+OLy
74         ENDDO  c        DO i=1-OLx,sNx+OLx
75    c           AtmospCO2(i,j,bi,bj)=278.0 _d -6
76    c        ENDDO
77    c       ENDDO
78    c#endif
79    
80    
81  C =================================================================  C =================================================================
82  C determine inorganic carbon chem coefficients  C determine inorganic carbon chem coefficients
83          DO j=1-OLy,sNy+OLy          DO j=jmin,jmax
84           DO i=1-OLx,sNx+OLx           DO i=imin,imax
85    
86  #ifdef DIC_BIOTIC  #ifdef DIC_BIOTIC
87  cQQQQ check ptracer numbers  cQQQQ check ptracer numbers
88               surfalk(i,j) = PTRACER(i,j,klev,bi,bj,2)               surfalk(i,j) = PTR_ALK(i,j,klev)
89       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
90               surfphos(i,j)  = PTRACER(i,j,klev,bi,bj,3)               surfphos(i,j)  = PTR_PO4(i,j,klev)
91       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
92  #else  #else
93               surfalk(i,j) = 2.366595 * salt(i,j,kLev,bi,bj)/gsm_s               surfalk(i,j) = 2.366595 _d 0 * salt(i,j,kLev,bi,bj)/gsm_s
94       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
95               surfphos(i,j)  = 5.1225e-4 * maskC(i,j,kLev,bi,bj)               surfphos(i,j)  = 5.1225 _d -4 * maskC(i,j,kLev,bi,bj)
96  #endif  #endif
97  C FOR NON-INTERACTIVE Si  C FOR NON-INTERACTIVE Si
98               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)
# Line 99  C FOR NON-INTERACTIVE Si Line 104  C FOR NON-INTERACTIVE Si
104       I                       bi,bj,iMin,iMax,jMin,jMax)       I                       bi,bj,iMin,iMax,jMin,jMax)
105  C====================================================================  C====================================================================
106    
107           DO j=jmin,jmax
108            DO i=imin,imax
109    C Compute AtmosP and Kwexch_Pre which are re-used for flux of O2
110    
111    #ifdef USE_PLOAD
112    C Convert anomalous pressure pLoad (in Pa) from atmospheric model
113    C to total pressure (in Atm)
114    C Note: it is assumed the reference atmospheric pressure is 1Atm=1013mb
115    C       rather than the actual ref. pressure from Atm. model so that on
116    C       average AtmosP is about 1 Atm.
117                    AtmosP(i,j,bi,bj)= 1. _d 0 + pLoad(i,j,bi,bj)/Pa2Atm
118    #endif
119    
120    C Pre-compute part of exchange coefficient: pisvel*(1-fice)
121    C Schmidt number is accounted for later
122                  pisvel(i,j)=0.337 _d 0 *wind(i,j,bi,bj)**2/3.6 _d 5
123                  Kwexch_Pre(i,j,bi,bj) = pisvel(i,j)
124         &                              * (1. _d 0 - FIce(i,j,bi,bj))
125    
126            ENDDO
127           ENDDO
128    
129  c pCO2 solver...  c pCO2 solver...
130  C$TAF LOOP = parallel  C$TAF LOOP = parallel
131         DO j=1-OLy,sNy+OLy         DO j=jmin,jmax
132  C$TAF LOOP = parallel  C$TAF LOOP = parallel
133          DO i=1-OLx,sNx+OLx          DO i=imin,imax
134    
135            IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN            IF ( maskC(i,j,kLev,bi,bj).NE.0. _d 0 ) THEN
136              CALL CALC_PCO2_APPROX(              CALL CALC_PCO2_APPROX(
137       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),
138       I        PTR_CO2(i,j,kLev), surfphos(i,j),       I        PTR_CO2(i,j,kLev), surfphos(i,j),
# Line 117  C$TAF LOOP = parallel Line 144  C$TAF LOOP = parallel
144       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),
145       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj) )       U        pH(i,j,bi,bj),pCO2(i,j,bi,bj) )
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=1-OLy,sNy+OLy         DO j=jmin,jmax
153          DO i=1-OLx,sNx+OLx          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
# Line 138  C Determine surface flux (FDIC) Line 165  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)
 c find exchange coefficient  
 c  account for schmidt number and and varible piston velocity  
               Kwexch(i,j) =  
      &             pisvel(i,j,bi,bj)  
      &             / sqrt(SchmidtNoDIC(i,j)/660.0)  
 c OR use a constant  coeff  
 c             Kwexch(i,j) = 5e-5  
 c ice influence  
 cQQ           Kwexch(i,j)  =(1.d0-Fice(i,j,bi,bj))*Kwexch(i,j)  
168    
169    C then account for Schmidt number
170                  Kwexch(i,j) = Kwexch_Pre(i,j,bi,bj)
171         &                    / sqrt(SchmidtNoDIC(i,j)/660.0 _d 0)
172    
173  C Calculate flux in terms of DIC units using K0, solubility  C Calculate flux in terms of DIC units using K0, solubility
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       &         maskC(i,j,kLev,bi,bj)*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.                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              IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN  #ifdef ALLOW_OLD_VIRTUALFLUX
189                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 180  c Line 202  c
202              ELSE              ELSE
203                VirtualFlux(i,j)=0. _d 0                VirtualFlux(i,j)=0. _d 0
204              ENDIF              ENDIF
205    #endif /* ALLOW_OLD_VIRTUALFLUX */
206            ENDDO            ENDDO
207           ENDDO           ENDDO
208    
209  C update tendency        C update tendency      
210           DO j=1-OLy,sNy+OLy           DO j=jmin,jmax
211            DO i=1-OLx,sNx+OLx            DO i=imin,imax
212             GDC(i,j)= maskC(i,j,kLev,bi,bj)*recip_drF(kLev)*(             GDC(i,j)= recip_drF(kLev)*recip_hFacC(i,j,kLev,bi,bj)
213       &                    FluxCO2(i,j,bi,bj) + VirtualFlux(i,j)       &              *(FluxCO2(i,j,bi,bj)
214       &                                              )  #ifdef ALLOW_OLD_VIRTUALFLUX
215         &              + VirtualFlux(i,j)
216    #endif
217         &               )
218            ENDDO            ENDDO
219           ENDDO           ENDDO
220    
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