1 | |
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2 | CCC $Header$ |
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3 | CCC TOP 1.0 , LOCEAN-IPSL (2005) |
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4 | C This software is governed by CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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5 | C --------------------------------------------------------------------------- |
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6 | CDIR$ LIST |
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7 | SUBROUTINE p4zflx |
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8 | #if defined key_passivetrc && defined key_trc_pisces |
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9 | CCC--------------------------------------------------------------------- |
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10 | CCC |
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11 | CCC ROUTINE p4zflx : PISCES MODEL |
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12 | CCC ***************************** |
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13 | CCC |
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14 | CCC |
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15 | CC PURPOSE. |
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16 | CC -------- |
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17 | CC *P4ZFLX* CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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18 | CC |
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19 | CC EXTERNALS. |
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20 | CC ---------- |
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21 | CC NONE. |
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22 | CC |
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23 | CC MODIFICATIONS: |
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24 | CC -------------- |
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25 | CC original : 1988-07 E. MAIER-REIMER MPI HAMBURG |
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26 | CC additions : 1998 O. Aumont |
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27 | CC modifications : 1999 C. Le Quere |
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28 | CC modifications : 2004 O. Aumont |
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29 | CC ----------------------------------------------------------------- |
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30 | CC parameters and commons |
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31 | CC ====================== |
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32 | CDIR$ NOLIST |
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33 | USE oce_trc |
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34 | USE trp_trc |
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35 | USE sms |
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36 | IMPLICIT NONE |
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37 | #include "domzgr_substitute.h90" |
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38 | CDIR$ LIST |
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39 | CC---------------------------------------------------------------------- |
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40 | CC local declarations |
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41 | CC ================== |
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42 | C |
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43 | INTEGER nspyr, ji, jj, krorr |
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44 | REAL zpdtan |
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45 | REAL kgco2(jpi,jpj),kgo2(jpi,jpj) |
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46 | REAL ttc, ws |
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47 | REAL fld, flu, oxy16, flu16, zfact |
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48 | REAL zph,ah2,zbot,zdic,zalk,schmitto2, zalka |
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49 | REAL schmittco2 |
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50 | C |
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51 | C |
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52 | C 1. ASSIGNATION TO EXPONENTS IN THE LISS AND MERLIVAT |
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53 | C FORMULATION OF THE GAS EXCHANGE RATE |
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54 | c ----------------------------------------------------- |
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55 | C |
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56 | zpdtan = raass / rdt |
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57 | nspyr = nint(zpdtan) |
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58 | C |
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59 | C* 1.1 SURFACE CHEMISTRY (PCO2 AND [H+] IN |
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60 | C SURFACE LAYER); THE RESULT OF THIS CALCULATION |
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61 | C IS USED TO COMPUTE AIR-SEA FLUX OF CO2 |
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62 | C --------------------------------------------------- |
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63 | C |
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64 | DO krorr = 1,10 |
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65 | C |
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66 | DO jj = 1,jpj |
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67 | DO ji = 1,jpi |
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68 | C |
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69 | C* 1.2 DUMMY VARIABLES FOR DIC, H+, AND BORATE |
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70 | C -------------------------------------------- |
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71 | C |
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72 | zbot = borat(ji,jj,1) |
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73 | zfact = rhop(ji,jj,1)/1000.+rtrn |
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74 | zdic = trn(ji,jj,1,jpdic)/zfact |
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75 | zph = max(hi(ji,jj,1),1.E-10)/zfact |
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76 | zalka = trn(ji,jj,1,jptal)/zfact |
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77 | C |
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78 | C* 1.3 CALCULATE [ALK]([CO3--], [HCO3-]) |
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79 | C ------------------------------------ |
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80 | C |
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81 | zalk=zalka- |
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82 | & (akw3(ji,jj,1)/zph-zph+zbot/(1.+zph/akb3(ji,jj,1))) |
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83 | C |
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84 | C* 1.4 CALCULATE [H+] AND [H2CO3] |
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85 | C ----------------------------------------- |
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86 | C |
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87 | ah2=sqrt((zdic-zalk)**2+4*(zalk*ak23(ji,jj,1) |
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88 | & /ak13(ji,jj,1))*(2*zdic-zalk)) |
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89 | ah2=0.5*ak13(ji,jj,1)/zalk*((zdic-zalk)+ah2) |
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90 | h2co3(ji,jj) = (2*zdic-zalk)/(2.+ak13(ji,jj,1)/ah2)*zfact |
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91 | hi(ji,jj,1) = ah2*zfact |
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92 | END DO |
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93 | END DO |
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94 | END DO |
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95 | C |
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96 | C |
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97 | C 2. COMPUTE FLUXES |
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98 | C -------------- |
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99 | C |
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100 | C 2.1 FIRST COMPUTE GAS EXCHANGE COEFFICIENTS |
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101 | C ------------------------------------------- |
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102 | C |
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103 | DO jj = 1,jpj |
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104 | DO ji = 1,jpi |
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105 | C |
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106 | ttc = min(35.,tn(ji,jj,1)) |
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107 | schmittco2=2073.1-125.62*ttc+3.6276*ttc**2 |
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108 | & -0.043126*ttc**3 |
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109 | ws=vatm(ji,jj) |
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110 | C |
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111 | C 2.2 COMPUTE GAS EXCHANGE FOR CO2 |
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112 | C -------------------------------- |
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113 | C |
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114 | kgco2(ji,jj) = (0.3*ws*ws + 2.5*(0.5246+ttc*(0.016256+ |
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115 | & ttc*0.00049946)))*sqrt(660./schmittco2) |
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116 | C |
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117 | C 2.3 CONVERT TO m/s, and apply sea-ice cover |
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118 | C ----------------------------------------------------- |
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119 | C |
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120 | kgco2(ji,jj) = kgco2(ji,jj)/(100.*3600.) |
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121 | & *(1-freeze(ji,jj))*tmask(ji,jj,1) |
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122 | # if defined key_off_degrad |
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123 | & *facvol(ji,jj,1) |
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124 | # endif |
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125 | C |
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126 | END DO |
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127 | END DO |
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128 | C |
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129 | C 2.5 COMPUTE GAS EXCHANGE COEFFICIENT FO O2 FROM |
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130 | C Waninkhof EQUATIONS |
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131 | C ----------------------------------------------- |
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132 | C |
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133 | DO jj = 1,jpj |
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134 | DO ji = 1,jpi |
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135 | C |
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136 | ws = vatm(ji,jj) |
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137 | schmitto2 = 1953.4-128.0*ttc+3.9918*ttc**2 |
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138 | & -0.050091*ttc**3 |
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139 | |
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140 | kgo2(ji,jj) = (0.3*ws*ws + 2.5*(0.5246+ttc*(0.016256+ |
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141 | & ttc*0.00049946)))*sqrt(660./schmitto2) |
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142 | |
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143 | C |
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144 | C CONVERT TO m/s AND APPLY SEA ICE COVER |
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145 | C ------------------------------------- |
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146 | C |
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147 | kgo2(ji,jj) = kgo2(ji,jj)/(100.*3600.) |
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148 | & *(1-freeze(ji,jj))*tmask(ji,jj,1) |
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149 | # if defined key_off_degrad |
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150 | & *facvol(ji,jj,1) |
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151 | # endif |
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152 | C |
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153 | ENDDO |
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154 | ENDDO |
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155 | C |
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156 | DO jj = 1,jpj |
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157 | DO ji = 1,jpi |
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158 | C |
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159 | C Compute CO2 flux for the sea and air |
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160 | C ------------------------------------ |
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161 | C |
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162 | fld = atcco2*tmask(ji,jj,1)*chemc(ji,jj,3)*kgco2(ji,jj) |
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163 | flu = h2co3(ji,jj)*tmask(ji,jj,1)*kgco2(ji,jj) |
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164 | tra(ji,jj,1,jpdic)= tra(ji,jj,1,jpdic)+(fld-flu) |
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165 | & /fse3t(ji,jj,1) |
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166 | C |
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167 | C Compute O2 flux |
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168 | C --------------- |
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169 | C |
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170 | oxy16 = trn(ji,jj,1,jpoxy) |
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171 | flu16 = (atcox*chemc(ji,jj,2)-oxy16)*kgo2(ji,jj) |
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172 | tra(ji,jj,1,jpoxy) = tra(ji,jj,1,jpoxy)+flu16 |
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173 | & /fse3t(ji,jj,1) |
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174 | C |
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175 | C Save diagnostics |
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176 | C ---------------- |
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177 | C |
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178 | # if defined key_trc_diaadd |
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179 | trc2d(ji,jj,1) = (fld-flu)*1000. |
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180 | trc2d(ji,jj,2) = flu16*1000. |
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181 | trc2d(ji,jj,3) = kgco2(ji,jj) |
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182 | trc2d(ji,jj,4) = atcco2-h2co3(ji,jj)/(chemc(ji,jj,1)+rtrn) |
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183 | # endif |
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184 | C |
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185 | END DO |
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186 | END DO |
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187 | C |
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188 | #endif |
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189 | RETURN |
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190 | END |
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