1 | MODULE p4zflx |
---|
2 | !!====================================================================== |
---|
3 | !! *** MODULE p4zflx *** |
---|
4 | !! TOP : PISCES CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
---|
5 | !!====================================================================== |
---|
6 | !! History : - ! 1988-07 (E. MAIER-REIMER) Original code |
---|
7 | !! - ! 1998 (O. Aumont) additions |
---|
8 | !! - ! 1999 (C. Le Quere) modifications |
---|
9 | !! 1.0 ! 2004 (O. Aumont) modifications |
---|
10 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 |
---|
11 | !!---------------------------------------------------------------------- |
---|
12 | #if defined key_pisces |
---|
13 | !!---------------------------------------------------------------------- |
---|
14 | !! 'key_pisces' PISCES bio-model |
---|
15 | !!---------------------------------------------------------------------- |
---|
16 | !! p4z_flx : CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
---|
17 | !!---------------------------------------------------------------------- |
---|
18 | USE oce_trc ! |
---|
19 | USE trp_trc |
---|
20 | USE sms |
---|
21 | |
---|
22 | IMPLICIT NONE |
---|
23 | PRIVATE |
---|
24 | |
---|
25 | PUBLIC p4z_flx ! called in p4zprg.F90 |
---|
26 | |
---|
27 | !!* Substitution |
---|
28 | # include "domzgr_substitute.h90" |
---|
29 | !!---------------------------------------------------------------------- |
---|
30 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
---|
31 | !! $Header:$ |
---|
32 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
33 | !!---------------------------------------------------------------------- |
---|
34 | |
---|
35 | CONTAINS |
---|
36 | |
---|
37 | SUBROUTINE p4z_flx |
---|
38 | !!--------------------------------------------------------------------- |
---|
39 | !! *** ROUTINE p4z_flx *** |
---|
40 | !! |
---|
41 | !! ** Purpose : CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
---|
42 | !! |
---|
43 | !! ** Method : - ??? |
---|
44 | !!--------------------------------------------------------------------- |
---|
45 | INTEGER :: ji, jj, jrorr |
---|
46 | REAL(wp) :: zpdtan, zttc, zws |
---|
47 | REAL(wp) :: zfld, zflu, zoxy16, zflu16, zfact |
---|
48 | REAL(wp) :: zph, zah2, zbot, zdic, zalk, zschmitto2, zalka, zschmittco2 |
---|
49 | REAL(wp), DIMENSION(jpi,jpj) :: zkgco2, zkgo2, zh2co3 |
---|
50 | !!--------------------------------------------------------------------- |
---|
51 | |
---|
52 | ! ----------------------------------------------------- |
---|
53 | ! ASSIGNATION TO EXPONENTS IN THE LISS AND MERLIVAT |
---|
54 | ! FORMULATION OF THE GAS EXCHANGE RATE |
---|
55 | ! ----------------------------------------------------- |
---|
56 | |
---|
57 | zpdtan = raass / rdt |
---|
58 | |
---|
59 | ! SURFACE CHEMISTRY (PCO2 AND [H+] IN |
---|
60 | ! SURFACE LAYER); THE RESULT OF THIS CALCULATION |
---|
61 | ! IS USED TO COMPUTE AIR-SEA FLUX OF CO2 |
---|
62 | |
---|
63 | DO jrorr = 1, 10 |
---|
64 | |
---|
65 | DO jj = 1, jpj |
---|
66 | DO ji = 1, jpi |
---|
67 | |
---|
68 | ! DUMMY VARIABLES FOR DIC, H+, AND BORATE |
---|
69 | zbot = borat(ji,jj,1) |
---|
70 | zfact = rhop(ji,jj,1) / 1000. + rtrn |
---|
71 | zdic = trn(ji,jj,1,jpdic) / zfact |
---|
72 | zph = MAX( hi(ji,jj,1), 1.e-10 ) / zfact |
---|
73 | zalka = trn(ji,jj,1,jptal) / zfact |
---|
74 | |
---|
75 | ! CALCULATE [ALK]([CO3--], [HCO3-]) |
---|
76 | zalk = zalka - ( akw3(ji,jj,1) / zph - zph + zbot / ( 1.+ zph / akb3(ji,jj,1) ) ) |
---|
77 | |
---|
78 | ! CALCULATE [H+] AND [H2CO3] |
---|
79 | zah2 = SQRT( (zdic-zalk)**2 + 4.* ( zalk * ak23(ji,jj,1) & |
---|
80 | & / ak13(ji,jj,1) ) * ( 2.* zdic - zalk ) ) |
---|
81 | zah2 = 0.5 * ak13(ji,jj,1) / zalk * ( ( zdic - zalk ) + zah2 ) |
---|
82 | zh2co3(ji,jj) = ( 2.* zdic - zalk ) / ( 2.+ ak13(ji,jj,1) / zah2 ) * zfact |
---|
83 | hi(ji,jj,1) = zah2 * zfact |
---|
84 | END DO |
---|
85 | END DO |
---|
86 | END DO |
---|
87 | |
---|
88 | |
---|
89 | ! -------------- |
---|
90 | ! COMPUTE FLUXES |
---|
91 | ! -------------- |
---|
92 | |
---|
93 | ! FIRST COMPUTE GAS EXCHANGE COEFFICIENTS |
---|
94 | ! ------------------------------------------- |
---|
95 | |
---|
96 | DO jj = 1, jpj |
---|
97 | DO ji = 1, jpi |
---|
98 | |
---|
99 | zttc = MIN( 35., tn(ji,jj,1) ) |
---|
100 | !!gm optimisation & more precise computation with factorisation of the polynome |
---|
101 | zschmittco2 = 2073.1 - 125.62 * zttc + 3.6276 * zttc**2 - 0.043126 * zttc**3 |
---|
102 | zws = vatm(ji,jj) |
---|
103 | |
---|
104 | ! COMPUTE GAS EXCHANGE FOR CO2 |
---|
105 | zkgco2(ji,jj) = ( 0.3 * zws * zws & |
---|
106 | & + 2.5 * ( 0.5246 + zttc * ( 0.016256 + zttc * 0.00049946 ) ) ) & |
---|
107 | & * SQRT( 660./ zschmittco2 ) |
---|
108 | |
---|
109 | ! CONVERT TO m/s, and apply sea-ice cover |
---|
110 | zkgco2(ji,jj) = zkgco2(ji,jj) / ( 100. * 3600. ) & |
---|
111 | # if defined key_off_degrad |
---|
112 | & * facvol(ji,jj,1) & |
---|
113 | # endif |
---|
114 | & * ( 1.- freeze(ji,jj) ) * tmask(ji,jj,1) |
---|
115 | |
---|
116 | END DO |
---|
117 | END DO |
---|
118 | |
---|
119 | ! COMPUTE GAS EXCHANGE COEFFICIENT FO O2 FROM Waninkhof EQUATIONS |
---|
120 | DO jj = 1, jpj |
---|
121 | DO ji = 1, jpi |
---|
122 | |
---|
123 | zws = vatm(ji,jj) |
---|
124 | zttc = MIN( 35., tn(ji,jj,1) ) |
---|
125 | !!gm optimisation & more precise computation with factorisation of the polynome |
---|
126 | zschmitto2 = 1953.4 - 128.0 * zttc + 3.9918 * zttc**2 - 0.050091 * zttc**3 |
---|
127 | |
---|
128 | zkgo2(ji,jj) = ( 0.3 * zws * zws & |
---|
129 | & + 2.5 * ( 0.5246 + zttc * ( 0.016256 + zttc * 0.00049946 ) ) ) & |
---|
130 | & * SQRT( 660./ zschmitto2 ) |
---|
131 | |
---|
132 | ! CONVERT TO m/s AND APPLY SEA ICE COVER |
---|
133 | zkgo2(ji,jj) = zkgo2(ji,jj) / ( 100.*3600.) & |
---|
134 | # if defined key_off_degrad |
---|
135 | & * facvol(ji,jj,1) & |
---|
136 | # endif |
---|
137 | & * ( 1.- freeze(ji,jj) ) *tmask(ji,jj,1) |
---|
138 | |
---|
139 | END DO |
---|
140 | END DO |
---|
141 | |
---|
142 | DO jj = 1, jpj |
---|
143 | DO ji = 1, jpi |
---|
144 | |
---|
145 | ! Compute CO2 flux for the sea and air |
---|
146 | zfld = atcco2 * tmask(ji,jj,1) * chemc(ji,jj,3) * zkgco2(ji,jj) |
---|
147 | zflu = zh2co3(ji,jj) * tmask(ji,jj,1) * zkgco2(ji,jj) |
---|
148 | tra(ji,jj,1,jpdic) = tra(ji,jj,1,jpdic) + ( zfld - zflu ) / fse3t(ji,jj,1) |
---|
149 | |
---|
150 | ! Compute O2 flux |
---|
151 | zoxy16 = trn(ji,jj,1,jpoxy) |
---|
152 | zflu16 = ( atcox * chemc(ji,jj,2) - zoxy16 ) * zkgo2(ji,jj) |
---|
153 | tra(ji,jj,1,jpoxy) = tra(ji,jj,1,jpoxy) + zflu16 / fse3t(ji,jj,1) |
---|
154 | |
---|
155 | # if defined key_trc_diaadd |
---|
156 | ! Save diagnostics |
---|
157 | trc2d(ji,jj,1) = ( zfld - zflu ) * 1000. |
---|
158 | trc2d(ji,jj,2) = zflu16 * 1000. |
---|
159 | trc2d(ji,jj,3) = zkgco2(ji,jj) |
---|
160 | trc2d(ji,jj,4) = atcco2 - zh2co3(ji,jj) / ( chemc(ji,jj,3) + rtrn ) |
---|
161 | # endif |
---|
162 | END DO |
---|
163 | END DO |
---|
164 | ! |
---|
165 | END SUBROUTINE p4z_flx |
---|
166 | |
---|
167 | #else |
---|
168 | !!====================================================================== |
---|
169 | !! Dummy module : No PISCES bio-model |
---|
170 | !!====================================================================== |
---|
171 | CONTAINS |
---|
172 | SUBROUTINE p4z_flx( kt ) ! Empty routine |
---|
173 | INTEGER, INTENT( in ) :: kt |
---|
174 | WRITE(*,*) 'p4z_flx: You should not have seen this print! error?', kt |
---|
175 | END SUBROUTINE p4z_flx |
---|
176 | #endif |
---|
177 | |
---|
178 | !!====================================================================== |
---|
179 | END MODULE p4zflx |
---|