1 | CDIR$ LIST |
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2 | SUBROUTINE p4zflx |
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3 | #if defined key_passivetrc && defined key_trc_pisces |
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4 | CCC--------------------------------------------------------------------- |
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5 | CCC |
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6 | CCC ROUTINE p4zflx : PISCES MODEL |
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7 | CCC ***************************** |
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8 | CCC |
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9 | CCC |
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10 | CC PURPOSE. |
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11 | CC -------- |
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12 | CC *P4ZFLX* CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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13 | CC |
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14 | CC EXTERNALS. |
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15 | CC ---------- |
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16 | CC NONE. |
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17 | CC |
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18 | CC MODIFICATIONS: |
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19 | CC -------------- |
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20 | CC original : 1988-07 E. MAIER-REIMER MPI HAMBURG |
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21 | CC additions : 1998 O. Aumont |
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22 | CC modifications : 1999 C. Le Quere |
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23 | CC modifications : 2004 O. Aumont |
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24 | CC ----------------------------------------------------------------- |
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25 | CC parameters and commons |
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26 | CC ====================== |
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27 | CDIR$ NOLIST |
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28 | USE oce_trc |
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29 | USE trp_trc |
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30 | USE sms |
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31 | IMPLICIT NONE |
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32 | CDIR$ LIST |
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33 | CC---------------------------------------------------------------------- |
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34 | CC local declarations |
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35 | CC ================== |
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36 | C |
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37 | INTEGER ji, jj, krorr |
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38 | REAL zexp1, zexp2 |
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39 | REAL a1, a2, a3, b2, b3, ttc, ws, alpco2 |
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40 | REAL fld, flu, oxy16, flu16 |
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41 | REAL zph,ah2,zbot,zdic,zalk,schmitt, zrhocd |
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42 | REAL zwind(jpi,jpj) |
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43 | |
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44 | CC |
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45 | CC---------------------------------------------------------------------- |
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46 | CC statement functions |
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47 | CC =================== |
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48 | CDIR$ NOLIST |
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49 | #include "domzgr_substitute.h90" |
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50 | CDIR$ LIST |
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51 | C |
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52 | C |
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53 | C 1. ASSIGNATION TO EXPONENTS IN THE LISS AND MERLIVAT |
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54 | C FORMULATION OF THE GAS EXCHANGE RATE |
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55 | c ----------------------------------------------------- |
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56 | C |
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57 | |
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58 | zexp1 = -2./3. |
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59 | zexp2 = -1./2. |
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60 | a1 = 0.17 |
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61 | a2 = 2.85 |
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62 | a3 = 5.90 |
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63 | b2 = 9.65 |
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64 | b3 = 49.3 |
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65 | |
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66 | zrhocd = 1.3*1.3e-3 |
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67 | DO jj = 1, jpj |
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68 | DO ji = 1 , jpi |
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69 | IF (igaswind .EQ. 0 ) then |
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70 | zwind(ji,jj) = sqrt(taux(ji,jj)**2+tauy(ji,jj)**2) |
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71 | $ /zrhocd |
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72 | ELSE |
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73 | zwind(ji,jj) = vatm(ji,jj) |
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74 | ENDIF |
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75 | END DO |
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76 | END DO |
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77 | C |
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78 | C* 1.1 SURFACE CHEMISTRY (PCO2 AND [H+] IN |
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79 | C SURFACE LAYER); THE RESULT OF THIS CALCULATION |
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80 | C IS USED TO COMPUTE AIR-SEA FLUX OF CO2 |
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81 | C --------------------------------------------------- |
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82 | C |
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83 | DO krorr = 1,10 |
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84 | C |
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85 | DO jj = 1,jpj |
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86 | DO ji = 1,jpi |
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87 | C |
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88 | C* 1.2 DUMMY VARIABLES FOR DIC, H+, AND BORATE |
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89 | C -------------------------------------------- |
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90 | C |
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91 | zbot = borat(ji,jj,1) |
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92 | zdic = trn(ji,jj,1,jpdic) |
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93 | zph = max(hi(ji,jj,1),1.E-10) |
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94 | C |
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95 | C* 1.3 CALCULATE [ALK]([CO3--], [HCO3-]) |
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96 | C ------------------------------------ |
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97 | C |
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98 | zalk=trn(ji,jj,1,jptal)- |
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99 | & (akw3(ji,jj,1)/zph-zph+zbot/(1.+zph/akb3(ji,jj,1))) |
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100 | C |
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101 | C* 1.4 CALCULATE [H+] AND [H2CO3] |
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102 | C ----------------------------------------- |
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103 | C |
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104 | ah2=sqrt((zdic-zalk)**2+4*(zalk*ak23(ji,jj,1) |
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105 | & /ak13(ji,jj,1))*(2*zdic-zalk)) |
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106 | ah2=0.5*ak13(ji,jj,1)/zalk*((zdic-zalk)+ah2) |
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107 | h2co3(ji,jj) = (2*zdic-zalk)/(2.+ak13(ji,jj,1)/ah2) |
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108 | hi(ji,jj,1) = ah2 |
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109 | END DO |
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110 | END DO |
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111 | END DO |
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112 | C |
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113 | C |
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114 | C 2. COMPUTE FLUXES |
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115 | C -------------- |
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116 | C |
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117 | C 2.1 FIRST COMPUTE GAS EXCHANGE COEFFICIENTS |
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118 | C ------------------------------------------- |
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119 | C |
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120 | DO jj = 1,jpj |
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121 | DO ji = 1,jpi |
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122 | |
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123 | ws = zwind(ji,jj) |
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124 | ttc = min(35.,tn(ji,jj,1)) |
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125 | schmitt= 2073.1-125.62*ttc+3.6276*ttc**2-0.043126*ttc**3 |
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126 | C |
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127 | C 2.2 COMPUTE GAS EXCHANGE FOR CO2 |
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128 | C -------------------------------- |
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129 | C |
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130 | kgwanin(ji,jj) = (0.3*ws*ws + 2.5*(0.5246+ttc*(0.016256+ |
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131 | & ttc*0.00049946)))*sqrt(660./schmitt) |
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132 | C |
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133 | C 2.3 CONVERT TO M/S |
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134 | C ------------------ |
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135 | C |
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136 | kgwanin(ji,jj) = kgwanin(ji,jj)/100./3600. |
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137 | C |
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138 | C 2.4 convert to mol/m2/s/uatm, alpco2(chemc(ji,jj,1)) is in |
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139 | C mol/L/uatm and apply ice cover |
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140 | C ----------------------------------------------------------- |
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141 | C |
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142 | kgwanin(ji,jj) = kgwanin(ji,jj)*chemc(ji,jj,1)*1.e3* |
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143 | & (1-freeze(ji,jj)) |
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144 | END DO |
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145 | END DO |
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146 | C |
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147 | C 2.5 COMPUTE GAS EXCHANGE COEFFICIENT FO O2 FROM LISS AND |
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148 | C MERLIVAT EQUATIONS |
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149 | C --------------------------------------------------------- |
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150 | C |
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151 | DO jj = 1,jpj |
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152 | DO ji = 1,jpi |
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153 | C |
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154 | ws = zwind(ji,jj) |
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155 | |
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156 | ttc = min(35.,tn(ji,jj,1)) |
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157 | schmitt = 1953.4-128.0*ttc+3.9918*ttc**2 |
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158 | & -0.050091*ttc**3 |
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159 | C |
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160 | IF (ws.LE.3.6) THEN |
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161 | fugaci(ji,jj) = (a1*ws)*(schmitt/660.)**zexp1 |
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162 | ENDIF |
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163 | IF ((ws.GT.3.6).AND.(ws.LE.13.)) THEN |
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164 | fugaci(ji,jj) = (a2*ws-b2)*(schmitt/660.)**zexp2 |
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165 | ENDIF |
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166 | IF (ws.GT.13.) THEN |
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167 | fugaci(ji,jj) = (a3*ws-b3)*(schmitt/660.)**zexp2 |
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168 | ENDIF |
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169 | C |
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170 | C CONVERT TO CM AND APPLY SEA ICE COVER |
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171 | C ------------------------------------- |
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172 | C |
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173 | fugaci(ji,jj) = fugaci(ji,jj)/100./3600.* |
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174 | $ (1-freeze(ji,jj))*tmask(ji,jj,1) |
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175 | C |
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176 | # if defined key_off_degrad |
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177 | fugaci(ji,jj) = exp(-rfact*fugaci(ji,jj) |
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178 | $ *facvol(ji,jj,1)/fse3t(ji,jj,1)) |
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179 | # else |
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180 | fugaci(ji,jj) = exp(-rfact*fugaci(ji,jj) |
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181 | $ /fse3t(ji,jj,1)) |
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182 | # endif |
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183 | |
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184 | ENDDO |
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185 | ENDDO |
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186 | C |
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187 | |
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188 | DO jj = 1,jpj |
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189 | DO ji = 1,jpi |
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190 | C |
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191 | C Compute CO2 flux for the sea and air |
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192 | C ------------------------------------ |
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193 | C |
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194 | alpco2 = chemc(ji,jj,1) |
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195 | fld = atcco2*tmask(ji,jj,1)*kgwanin(ji,jj) |
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196 | flu = h2co3(ji,jj)/alpco2 |
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197 | & *tmask(ji,jj,1)*kgwanin(ji,jj) |
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198 | |
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199 | tra(ji,jj,1,jpdic)= tra(ji,jj,1,jpdic)+(fld-flu) |
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200 | & /1000./fse3t(ji,jj,1) |
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201 | C |
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202 | C Compute O2 flux |
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203 | C --------------- |
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204 | C |
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205 | oxy16 = trn(ji,jj,1,jpoxy) |
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206 | flu16 = (-fugaci(ji,jj)+1)*fse3t(ji,jj,1) |
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207 | & *(atcox*chemc(ji,jj,3)-oxy16)* |
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208 | & tmask(ji,jj,1)/rfact |
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209 | tra(ji,jj,1,jpoxy) = tra(ji,jj,1,jpoxy)+flu16 |
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210 | & /fse3t(ji,jj,1) |
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211 | |
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212 | C |
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213 | C Save diagnostics |
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214 | C ---------------- |
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215 | C |
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216 | # if defined key_trc_diaadd |
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217 | trc2d(ji,jj,1) = (fld-flu) |
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218 | trc2d(ji,jj,2) = flu16*1000. |
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219 | trc2d(ji,jj,3) = kgwanin(ji,jj) |
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220 | trc2d(ji,jj,4) = (fld-flu)/(kgwanin(ji,jj)+1.E-15) |
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221 | # endif |
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222 | C |
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223 | END DO |
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224 | END DO |
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225 | C |
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226 | #endif |
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227 | RETURN |
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228 | END |
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229 | |
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