/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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revision 1.4 by edhill, Thu Oct 9 04:19:19 2003 UTC revision 1.14 by dfer, Mon Aug 13 02:29:40 2007 UTC
# Line 1  Line 1 
1    C $Header$
2    C $Name$
3    
4  #include "DIC_OPTIONS.h"  #include "DIC_OPTIONS.h"
5  #include "PTRACERS_OPTIONS.h"  #include "PTRACERS_OPTIONS.h"
6  #include "GCHEM_OPTIONS.h"  #include "GCHEM_OPTIONS.h"
7    
8  CStartOfInterFace  CBOP
9        SUBROUTINE DIC_SURFFORCING( PTR_CO2 , GDC,  C !ROUTINE: DIC_SURFFORCING
10    
11    C !INTERFACE: ==========================================================
12          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    
16  C     /==========================================================\  C !DESCRIPTION:
17  C     | SUBROUTINE DIC_SURFFORCING                               |  C  Calculate the carbon air-sea flux terms              
18  C     | o Calculate the carbon air-sea flux terms                |  C  following external_forcing_dic.F (OCMIP run) from Mick            
 C     | o following external_forcing_dic.F from Mick             |  
 C     |==========================================================|  
       IMPLICIT NONE  
19    
20  C     == GLobal variables ==  C !USES: ===============================================================
21          IMPLICIT NONE
22  #include "SIZE.h"  #include "SIZE.h"
23  #include "DYNVARS.h"  #include "DYNVARS.h"
24  #include "EEPARAMS.h"  #include "EEPARAMS.h"
# Line 22  C     == GLobal variables == Line 26  C     == GLobal variables ==
26  #include "GRID.h"  #include "GRID.h"
27  #include "FFIELDS.h"  #include "FFIELDS.h"
28  #include "DIC_ABIOTIC.h"  #include "DIC_ABIOTIC.h"
 #ifdef DIC_BIOTIC  
 #include "PTRACERS.h"  
 #endif  
29    
30  C     == Routine arguments ==  C !INPUT PARAMETERS: ===================================================
31    C  myThid               :: thread number
32    C  myIter               :: current timestep
33    C  myTime               :: current time
34    c  PTR_CO2              :: DIC tracer field
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  GDC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _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: ===================================================
43    c GDC                   :: tendency due to air-sea exchange
44          _RL  GDC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45    
46  #ifdef ALLOW_PTRACERS  #ifdef ALLOW_PTRACERS
47  C     == Local variables ==  
48    C !LOCAL VARIABLES: ====================================================
49         INTEGER I,J, kLev, it         INTEGER I,J, kLev, it
50  C Number of iterations for pCO2 solvers...  C Number of iterations for pCO2 solvers...
51  C Solubility relation coefficients  C Solubility relation coefficients
# Line 46  C local variables for carbon chem Line 57  C local variables for carbon chem
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 VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
60    CEOP
61    
62  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
63    
64        kLev=1        kLev=1
65    
66    c if coupled to atmsopheric model, use the
67    c Co2 value passed from the coupler
68    #ifndef USE_ATMOSCO2
69  C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv  C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv
70         DO j=1-OLy,sNy+OLy         DO j=1-OLy,sNy+OLy
71          DO i=1-OLx,sNx+OLx          DO i=1-OLx,sNx+OLx
72             AtmospCO2(i,j,bi,bj)=278.0d-6             AtmospCO2(i,j,bi,bj)=278.0d-6
73          ENDDO          ENDDO
74         ENDDO         ENDDO
75    #endif
76    
77    
78  C =================================================================  C =================================================================
79  C determine inorganic carbon chem coefficients  C determine inorganic carbon chem coefficients
80          DO j=1-OLy,sNy+OLy          DO j=jmin,jmax
81           DO i=1-OLx,sNx+OLx           DO i=imin,imax
82    
83  #ifdef DIC_BIOTIC  #ifdef DIC_BIOTIC
84  cQQQQ check ptracer numbers  cQQQQ check ptracer numbers
85               surfalk(i,j) = PTRACER(i,j,klev,bi,bj,2)               surfalk(i,j) = PTR_ALK(i,j,klev)
86       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
87               surfphos(i,j)  = PTRACER(i,j,klev,bi,bj,3)               surfphos(i,j)  = PTR_PO4(i,j,klev)
88       &                          * maskC(i,j,kLev,bi,bj)       &                          * maskC(i,j,kLev,bi,bj)
89  #else  #else
90               surfalk(i,j) = 2.366595 * salt(i,j,kLev,bi,bj)/gsm_s               surfalk(i,j) = 2.366595 * salt(i,j,kLev,bi,bj)/gsm_s
# Line 87  C======================================= Line 103  C=======================================
103    
104  c pCO2 solver...  c pCO2 solver...
105  C$TAF LOOP = parallel  C$TAF LOOP = parallel
106         DO j=1-OLy,sNy+OLy         DO j=jmin,jmax
107  C$TAF LOOP = parallel  C$TAF LOOP = parallel
108          DO i=1-OLx,sNx+OLx          DO i=imin,imax
109    
110            IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN            IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN
111              CALL CALC_PCO2_APPROX(              CALL CALC_PCO2_APPROX(
# Line 108  C$TAF LOOP = parallel Line 124  C$TAF LOOP = parallel
124          ENDDO          ENDDO
125         ENDDO         ENDDO
126    
127         DO j=1-OLy,sNy+OLy         DO j=jmin,jmax
128          DO i=1-OLx,sNx+OLx          DO i=imin,imax
129    
130              IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN              IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN
131  C calculate SCHMIDT NO. for CO2  C calculate SCHMIDT NO. for CO2
# Line 120  C calculate SCHMIDT NO. for CO2 Line 136  C calculate SCHMIDT NO. for CO2
136       &          + 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)
137       &                *theta(i,j,kLev,bi,bj)       &                *theta(i,j,kLev,bi,bj)
138    
139    c
140    #ifdef USE_PLOAD
141    C Convert anomalous pressure pLoad (in Pa) from atmospheric model
142    C to total pressure (in Atm)
143    C Note: it is assumed the reference atmospheric pressure is 1Atm=1013mb
144    C       rather than the actual ref. pressure from Atm. model so that on
145    C       average AtmosP is about 1 Atm.
146                   AtmosP(i,j,bi,bj)= 1. _d 0 + pLoad(i,j,bi,bj)/Pa2Atm
147    #endif
148    
149  C Determine surface flux (FDIC)  C Determine surface flux (FDIC)
150  C first correct pCO2at for surface atmos pressure  C first correct pCO2at for surface atmos pressure
151                pCO2sat(i,j) =                pCO2sat(i,j) =
152       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)       &          AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
153  c find exchange coefficient  c find exchange coefficient
154  c  account for schmidt number and and varible piston velocity  c  account for schmidt number and and varible piston velocity
155                  pisvel(i,j,bi,bj)  =0.337*wind(i,j,bi,bj)**2/3.6d5
156                Kwexch(i,j) =                Kwexch(i,j) =
157       &             pisvel(i,j,bi,bj)       &             pisvel(i,j,bi,bj)
158       &             / sqrt(SchmidtNoDIC(i,j)/660.0)       &             / sqrt(SchmidtNoDIC(i,j)/660.0)
159  c OR use a constant  coeff  c OR use a constant  coeff
160  c             Kwexch(i,j) = 5e-5  c             Kwexch(i,j) = 5e-5
161  c ice influence  c ice influence
162  cQQ           Kwexch(i,j)  =(1.d0-Fice(i,j,bi,bj))*Kwexch(i,j)                Kwexch(i,j)  =(1.d0-Fice(i,j,bi,bj))*Kwexch(i,j)
163    
164    
165  C Calculate flux in terms of DIC units using K0, solubility  C Calculate flux in terms of DIC units using K0, solubility
# Line 158  C Positive EminusPforV => loss of water Line 185  C Positive EminusPforV => loss of water
185  C in salinity. Thus, also increase in other surface tracers  C in salinity. Thus, also increase in other surface tracers
186  C (i.e. positive virtual flux into surface layer)  C (i.e. positive virtual flux into surface layer)
187  C ...so here, VirtualFLux = dC/dt!  C ...so here, VirtualFLux = dC/dt!
188                VirtualFlux(i,j)=gsm_DIC*surfaceTendencyS(i,j,bi,bj)/gsm_s                VirtualFlux(i,j)=gsm_DIC*surfaceForcingS(i,j,bi,bj)/gsm_s
189  c OR  c OR
190  c let virtual flux be zero  c let virtual flux be zero
191  c              VirtualFlux(i,j)=0.d0  c              VirtualFlux(i,j)=0.d0
# Line 170  c Line 197  c
197           ENDDO           ENDDO
198    
199  C update tendency        C update tendency      
200           DO j=1-OLy,sNy+OLy           DO j=jmin,jmax
201            DO i=1-OLx,sNx+OLx            DO i=imin,imax
202             GDC(i,j)= maskC(i,j,kLev,bi,bj)*(             GDC(i,j)= maskC(i,j,kLev,bi,bj)*recip_drF(kLev)*
203       &                    FluxCO2(i,j,bi,bj)*recip_drF(kLev)       &                     recip_hFacC(i,j,kLev,bi,bj)*(
204       &                    + VirtualFlux(i,j)       &                    FluxCO2(i,j,bi,bj) + VirtualFlux(i,j)
205       &                                              )       &                                              )
206            ENDDO            ENDDO
207           ENDDO           ENDDO
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