/[MITgcm]/MITgcm/pkg/dic/dic_surfforcing.F
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Revision 1.12 - (hide annotations) (download)
Tue Nov 28 21:16:03 2006 UTC (17 years, 10 months ago) by stephd
Branch: MAIN
CVS Tags: checkpoint58u_post, checkpoint58w_post, checkpoint58x_post, checkpoint58t_post, checkpoint59a, checkpoint59, checkpoint58y_post, checkpoint58v_post, checkpoint58s_post
Changes since 1.11: +6 -8 lines 
o changes to make dic code more adjoint friendly:
      - standardize how tracers are passed from dic_biotic_forcing to
        other subroutines
      - add a tanh function to take the place of min(x,y) in bio_export.F
        and fe_chem.F.
1 stephd 1.12 C $Header: /u/gcmpack/MITgcm/pkg/dic/dic_surfforcing.F,v 1.11 2006/09/12 19:58:02 stephd Exp $
2 jmc 1.6 C $Name: $
3    
4 edhill 1.4 #include "DIC_OPTIONS.h"
5 stephd 1.1 #include "PTRACERS_OPTIONS.h"
6     #include "GCHEM_OPTIONS.h"
7    
8 stephd 1.5 CBOP
9     C !ROUTINE: DIC_SURFFORCING
10    
11     C !INTERFACE: ==========================================================
12 stephd 1.12 SUBROUTINE DIC_SURFFORCING( PTR_CO2 , PTR_ALK, PTR_PO4, GDC,
13 stephd 1.1 I bi,bj,imin,imax,jmin,jmax,
14     I myIter,myTime,myThid)
15    
16 stephd 1.5 C !DESCRIPTION:
17     C Calculate the carbon air-sea flux terms
18     C following external_forcing_dic.F (OCMIP run) from Mick
19    
20     C !USES: ===============================================================
21 stephd 1.1 IMPLICIT NONE
22     #include "SIZE.h"
23     #include "DYNVARS.h"
24     #include "EEPARAMS.h"
25     #include "PARAMS.h"
26     #include "GRID.h"
27     #include "FFIELDS.h"
28     #include "DIC_ABIOTIC.h"
29    
30 stephd 1.5 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 stephd 1.1 INTEGER myIter, myThid
36     _RL myTime
37     _RL PTR_CO2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
38 stephd 1.12 _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 stephd 1.5 INTEGER iMin,iMax,jMin,jMax, bi, bj
41    
42     C !OUTPUT PARAMETERS: ===================================================
43 stephd 1.8 c GDC :: tendency due to air-sea exchange
44 stephd 1.1 _RL GDC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45    
46     #ifdef ALLOW_PTRACERS
47 stephd 1.5
48     C !LOCAL VARIABLES: ====================================================
49 stephd 1.2 INTEGER I,J, kLev, it
50 stephd 1.1 C Number of iterations for pCO2 solvers...
51     C Solubility relation coefficients
52     _RL SchmidtNoDIC(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
53     _RL pCO2sat(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
54     _RL Kwexch(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
55     C local variables for carbon chem
56     _RL surfalk(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
57     _RL surfphos(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
58     _RL surfsi(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
59     _RL VirtualFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
60 stephd 1.5 CEOP
61 stephd 1.1
62     cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
63    
64     kLev=1
65    
66     C PRE-INDUSTRIAL STEADY STATE pCO2 = 278.0 ppmv
67     DO j=1-OLy,sNy+OLy
68     DO i=1-OLx,sNx+OLx
69     AtmospCO2(i,j,bi,bj)=278.0d-6
70     ENDDO
71     ENDDO
72    
73    
74     C =================================================================
75     C determine inorganic carbon chem coefficients
76 stephd 1.10 DO j=jmin,jmax
77     DO i=imin,imax
78 stephd 1.1
79     #ifdef DIC_BIOTIC
80     cQQQQ check ptracer numbers
81 stephd 1.12 surfalk(i,j) = PTR_ALK(i,j,klev)
82 stephd 1.1 & * maskC(i,j,kLev,bi,bj)
83 stephd 1.12 surfphos(i,j) = PTR_PO4(i,j,klev)
84 stephd 1.1 & * maskC(i,j,kLev,bi,bj)
85     #else
86     surfalk(i,j) = 2.366595 * salt(i,j,kLev,bi,bj)/gsm_s
87     & * maskC(i,j,kLev,bi,bj)
88     surfphos(i,j) = 5.1225e-4 * maskC(i,j,kLev,bi,bj)
89     #endif
90     C FOR NON-INTERACTIVE Si
91 stephd 1.3 surfsi(i,j) = SILICA(i,j,bi,bj) * maskC(i,j,kLev,bi,bj)
92 stephd 1.1 ENDDO
93     ENDDO
94    
95     CALL CARBON_COEFFS(
96     I theta,salt,
97     I bi,bj,iMin,iMax,jMin,jMax)
98     C====================================================================
99    
100     c pCO2 solver...
101 stephd 1.3 C$TAF LOOP = parallel
102 stephd 1.10 DO j=jmin,jmax
103 stephd 1.3 C$TAF LOOP = parallel
104 stephd 1.10 DO i=imin,imax
105 stephd 1.1
106     IF(maskC(i,j,kLev,bi,bj) .NE. 0.)THEN
107     CALL CALC_PCO2_APPROX(
108     I theta(i,j,kLev,bi,bj),salt(i,j,kLev,bi,bj),
109     I PTR_CO2(i,j,kLev), surfphos(i,j),
110     I surfsi(i,j),surfalk(i,j),
111     I ak1(i,j,bi,bj),ak2(i,j,bi,bj),
112     I ak1p(i,j,bi,bj),ak2p(i,j,bi,bj),ak3p(i,j,bi,bj),
113     I aks(i,j,bi,bj),akb(i,j,bi,bj),akw(i,j,bi,bj),
114     I aksi(i,j,bi,bj),akf(i,j,bi,bj),ff(i,j,bi,bj),
115     I bt(i,j,bi,bj),st(i,j,bi,bj),ft(i,j,bi,bj),
116     U pH(i,j,bi,bj),pCO2(i,j,bi,bj) )
117     ELSE
118     pCO2(i,j,bi,bj)=0. _d 0
119     END IF
120     ENDDO
121     ENDDO
122    
123 stephd 1.10 DO j=jmin,jmax
124     DO i=imin,imax
125 stephd 1.1
126     IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN
127     C calculate SCHMIDT NO. for CO2
128     SchmidtNoDIC(i,j) =
129     & sca1
130     & + sca2 * theta(i,j,kLev,bi,bj)
131     & + sca3 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)
132     & + sca4 * theta(i,j,kLev,bi,bj)*theta(i,j,kLev,bi,bj)
133     & *theta(i,j,kLev,bi,bj)
134    
135     C Determine surface flux (FDIC)
136     C first correct pCO2at for surface atmos pressure
137     pCO2sat(i,j) =
138     & AtmosP(i,j,bi,bj)*AtmospCO2(i,j,bi,bj)
139     c find exchange coefficient
140     c account for schmidt number and and varible piston velocity
141 stephd 1.11 pisvel(i,j,bi,bj) =0.337*wind(i,j,bi,bj)**2/3.6d5
142 stephd 1.1 Kwexch(i,j) =
143     & pisvel(i,j,bi,bj)
144     & / sqrt(SchmidtNoDIC(i,j)/660.0)
145     c OR use a constant coeff
146     c Kwexch(i,j) = 5e-5
147     c ice influence
148 stephd 1.9 Kwexch(i,j) =(1.d0-Fice(i,j,bi,bj))*Kwexch(i,j)
149 stephd 1.1
150    
151     C Calculate flux in terms of DIC units using K0, solubility
152     C Flux = Vp * ([CO2sat] - [CO2])
153     C CO2sat = K0*pCO2atmos*P/P0
154     C Converting pCO2 to [CO2] using ff, as in CALC_PCO2
155 stephd 1.2 FluxCO2(i,j,bi,bj) =
156 stephd 1.1 & maskC(i,j,kLev,bi,bj)*Kwexch(i,j)*(
157     & ak0(i,j,bi,bj)*pCO2sat(i,j) -
158     & ff(i,j,bi,bj)*pCO2(i,j,bi,bj)
159     & )
160     ELSE
161 stephd 1.2 FluxCO2(i,j,bi,bj) = 0.
162 stephd 1.1 ENDIF
163     C convert flux (mol kg-1 m s-1) to (mol m-2 s-1)
164 stephd 1.2 FluxCO2(i,j,bi,bj) = FluxCO2(i,j,bi,bj)/permil
165 stephd 1.1
166     IF (maskC(i,j,kLev,bi,bj).NE.0.) THEN
167     c calculate virtual flux
168     c EminusPforV = dS/dt*(1/Sglob)
169     C NOTE: Be very careful with signs here!
170     C Positive EminusPforV => loss of water to atmos and increase
171     C in salinity. Thus, also increase in other surface tracers
172     C (i.e. positive virtual flux into surface layer)
173     C ...so here, VirtualFLux = dC/dt!
174 jmc 1.7 VirtualFlux(i,j)=gsm_DIC*surfaceForcingS(i,j,bi,bj)/gsm_s
175 stephd 1.1 c OR
176     c let virtual flux be zero
177     c VirtualFlux(i,j)=0.d0
178     c
179     ELSE
180     VirtualFlux(i,j)=0. _d 0
181     ENDIF
182     ENDDO
183     ENDDO
184    
185     C update tendency
186 stephd 1.10 DO j=jmin,jmax
187     DO i=imin,imax
188 stephd 1.9 GDC(i,j)= maskC(i,j,kLev,bi,bj)*recip_drF(kLev)*
189     & recip_hFacC(i,j,kLev,bi,bj)*(
190 stephd 1.8 & FluxCO2(i,j,bi,bj) + VirtualFlux(i,j)
191 stephd 1.1 & )
192     ENDDO
193     ENDDO
194    
195     #endif
196     RETURN
197     END
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