1 | CDIR$ LIST |
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2 | SUBROUTINE p4zrem |
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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 p4zrem : PISCES MODEL |
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7 | CCC ***************************** |
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8 | CCC |
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9 | CCC PURPOSE : |
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10 | CCC --------- |
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11 | CCC Compute remineralization/scavenging of organic compounds |
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12 | CCC |
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13 | CC INPUT : |
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14 | CC ----- |
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15 | CC common |
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16 | CC all the common defined in opa |
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17 | CC |
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18 | CC |
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19 | CC OUTPUT : : no |
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20 | CC ------ |
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21 | CC |
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22 | CC EXTERNAL : |
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23 | CC -------- |
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24 | CC None |
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25 | CC |
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26 | CC MODIFICATIONS: |
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27 | CC -------------- |
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28 | CC original : 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 | CDIR$ LIST |
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38 | CC---------------------------------------------------------------------- |
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39 | CC local declarations |
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40 | CC ================== |
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41 | INTEGER ji, jj, jk |
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42 | REAL remip,remik,xlam1b |
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43 | REAL xkeq,xfeequi,siremin |
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44 | REAL zsatur,zsatur2,znusil |
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45 | REAL fesatur(jpi,jpj,jpk) |
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46 | CC---------------------------------------------------------------------- |
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47 | CC statement functions |
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48 | CC =================== |
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49 | CDIR$ NOLIST |
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50 | #include "domzgr_substitute.h90" |
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51 | CDIR$ LIST |
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52 | C |
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53 | C Computation of the mean phytoplankton concentration as |
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54 | C a crude estimate of the bacterial biomass |
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55 | C -------------------------------------------------- |
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56 | C |
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57 | DO jj=1,jpj |
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58 | DO ji=1,jpi |
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59 | phymoy(ji,jj)=min((trn(ji,jj,1,jpphy)+trn(ji,jj,1,jpdia)) |
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60 | . ,3.E-6) |
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61 | END DO |
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62 | END DO |
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63 | |
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64 | DO jk = 1,jpk-1 |
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65 | DO jj = 1,jpj |
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66 | DO ji = 1,jpi |
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67 | C |
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68 | C DENITRIFICATION FACTOR COMPUTED FROM O2 LEVELS |
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69 | C ---------------------------------------------- |
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70 | C |
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71 | nitrfac(ji,jj,jk)= |
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72 | & max(0.,0.4*(6.E-6-trn(ji,jj,jk,jpoxy))/(oxymin+ |
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73 | & trn(ji,jj,jk,jpoxy))) |
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74 | nitrfac(ji,jj,jk)=min(1.,nitrfac(ji,jj,jk)) |
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75 | END DO |
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76 | END DO |
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77 | END DO |
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78 | |
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79 | DO jk = 1,jpkm1 |
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80 | DO jj = 1,jpj |
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81 | DO ji = 1,jpi |
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82 | C |
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83 | C DOC ammonification. Depends on depth, phytoplankton biomass |
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84 | C and a limitation term which is supposed to be a parameterization |
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85 | C of the bacterial activity. |
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86 | C ---------------------------------------------------------------- |
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87 | remik= |
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88 | & xremik*rfact2/(rjjss*1.E-6)*tmask(ji,jj,jk) |
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89 | & *xlimbac(ji,jj,jk)*phymoy(ji,jj)*max(0.1 |
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90 | & ,exp(-max(0.,(fsdept(ji,jj,jk)-hmld(ji,jj)))/200.)) |
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91 | # if defined key_off_degrad |
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92 | & *facvol(ji,jj,jk) |
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93 | # endif |
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94 | C |
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95 | C Ammonification in oxic waters with oxygen consumption |
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96 | C ----------------------------------------------------- |
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97 | C |
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98 | olimi(ji,jj,jk)=min((trn(ji,jj,jk,jpoxy)-rtrn)/o2ut, |
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99 | & remik*(1.-nitrfac(ji,jj,jk))*trn(ji,jj,jk,jpdoc)) |
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100 | olimi(ji,jj,jk)=max(0.,olimi(ji,jj,jk)) |
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101 | C |
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102 | C Ammonification in suboxic waters with denitrification |
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103 | C ------------------------------------------------------- |
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104 | C |
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105 | denitr(ji,jj,jk)=min((trn(ji,jj,jk,jpno3)-rtrn)/6.1, |
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106 | & remik*nitrfac(ji,jj,jk)*trn(ji,jj,jk,jpdoc)) |
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107 | END DO |
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108 | END DO |
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109 | END DO |
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110 | |
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111 | DO jk = 1,jpkm1 |
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112 | DO jj = 1,jpj |
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113 | DO ji = 1,jpi |
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114 | C |
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115 | C NH4 nitrification to NO3. Ceased for oxygen concentrations |
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116 | C below 2 umol/L. Inhibited at strong light |
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117 | C ---------------------------------------------------------- |
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118 | C |
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119 | onitr(ji,jj,jk)=nitrif*rfact2/rjjss*trn(ji,jj,jk,jpnh4) |
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120 | & *1./(1.+emoy(ji,jj,jk))*tmask(ji,jj,jk) |
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121 | & *(1.-nitrfac(ji,jj,jk)) |
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122 | # if defined key_off_degrad |
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123 | & *facvol(ji,jj,jk) |
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124 | # endif |
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125 | END DO |
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126 | END DO |
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127 | END DO |
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128 | |
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129 | DO jk = 1,jpkm1 |
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130 | DO jj = 1,jpj |
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131 | DO ji = 1,jpi |
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132 | C |
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133 | C Bacterial uptake of iron. No iron is available in DOC. So |
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134 | C Bacteries are obliged to take up iron from the water. Some |
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135 | C studies (especially at Papa) have shown this uptake to be |
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136 | C significant |
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137 | C ---------------------------------------------------------- |
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138 | C |
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139 | xbactfer(ji,jj,jk)=0.02*20E-6*rfact2 |
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140 | & *prmax(ji,jj,jk)*tmask(ji,jj,jk)*xlimphy(ji,jj,jk) |
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141 | & *xlimdia(ji,jj,jk)*phymoy(ji,jj)*exp(-max |
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142 | & (fsdept(ji,jj,jk)-hmld(ji,jj),0.)/200.) |
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143 | END DO |
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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 | DO jk = 1,jpkm1 |
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148 | DO jj = 1,jpj |
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149 | DO ji = 1,jpi |
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150 | C |
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151 | C POC disaggregation by turbulence and bacterial activity. |
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152 | C ------------------------------------------------------------- |
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153 | C |
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154 | remip=xremip/rjjss*rfact2*tmask(ji,jj,jk)*(0.25+0.75 |
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155 | & *exp(-max((fsdept(ji,jj,jk)-150.),0.)/1000.)) |
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156 | # if defined key_off_degrad |
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157 | & *facvol(ji,jj,jk) |
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158 | # endif |
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159 | C |
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160 | C POC disaggregation rate is reduced in anoxic zone as shown by |
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161 | C sediment traps data. In oxic area, the exponent of the martin's |
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162 | C law is around -0.87. In anoxic zone, it is around -0.35. This |
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163 | C means a disaggregation constant about 0.5 the value in oxic zones |
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164 | C ----------------------------------------------------------------- |
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165 | C |
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166 | remip=remip*(1.-0.5*nitrfac(ji,jj,jk)) |
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167 | C |
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168 | orem(ji,jj,jk)=remip*trn(ji,jj,jk,jppoc) |
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169 | orem2(ji,jj,jk)=remip*trn(ji,jj,jk,jpgoc) |
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170 | ofer(ji,jj,jk)=remip*trn(ji,jj,jk,jpsfe) |
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171 | ofer2(ji,jj,jk)=remip*trn(ji,jj,jk,jpbfe) |
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172 | C |
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173 | END DO |
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174 | END DO |
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175 | END DO |
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176 | |
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177 | DO jk = 1,jpkm1 |
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178 | DO jj = 1,jpj |
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179 | DO ji = 1,jpi |
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180 | C |
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181 | C Remineralization rate of BSi depedant on T and saturation |
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182 | C --------------------------------------------------------- |
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183 | C |
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184 | zsatur=(sio3eq(ji,jj,jk)-trn(ji,jj,jk,jpsil))/ |
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185 | & (sio3eq(ji,jj,jk)+rtrn) |
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186 | zsatur2=zsatur*(1.+tn(ji,jj,jk)/400.)**2* |
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187 | & (1.+tn(ji,jj,jk)/400.)**2 |
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188 | znusil=0.225*(1.+tn(ji,jj,jk)/15.)*zsatur+0.775 |
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189 | & *exp(9.25*log(zsatur2)) |
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190 | |
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191 | siremin=xsirem/rjjss*rfact2*tmask(ji,jj,jk)*znusil |
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192 | # if defined key_off_degrad |
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193 | & *facvol(ji,jj,jk) |
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194 | # endif |
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195 | C |
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196 | osil(ji,jj,jk)=siremin*trn(ji,jj,jk,jpdsi) |
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197 | END DO |
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198 | END DO |
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199 | END DO |
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200 | |
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201 | DO jk = 1,jpkm1 |
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202 | DO jj = 1,jpj |
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203 | DO ji = 1,jpi |
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204 | C |
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205 | C scavenging rate of iron. this scavenging rate depends on the |
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206 | C load in particles on which they are adsorbed. The |
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207 | C parameterization has been taken from studies on Th |
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208 | C ------------------------------------------------------------ |
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209 | C |
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210 | xkeq=fekeq(ji,jj,jk) |
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211 | fesatur(ji,jj,jk)=0.6E-9 |
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212 | xfeequi=(-(1.+fesatur(ji,jj,jk)*xkeq-xkeq*trn(ji,jj,jk,jpfer))+ |
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213 | & sqrt((1.+fesatur(ji,jj,jk)*xkeq-xkeq*trn(ji,jj,jk,jpfer))**2 |
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214 | & +4.*trn(ji,jj,jk,jpfer)*xkeq))/(2.*xkeq) |
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215 | |
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216 | xlam1b=3E-5+xlam1*(trn(ji,jj,jk,jppoc) |
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217 | & +trn(ji,jj,jk,jpgoc)+trn(ji,jj,jk,jpcal)+ |
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218 | & trn(ji,jj,jk,jpdsi))*1E6 |
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219 | |
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220 | xscave(ji,jj,jk)=xfeequi*xlam1b/rjjss*rfact2*tmask(ji,jj,jk) |
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221 | # if defined key_off_degrad |
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222 | & *facvol(ji,jj,jk) |
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223 | # endif |
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224 | C |
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225 | C Increased scavenging for very high iron concentrations |
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226 | C found near the coasts due to increased lithogenic particles |
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227 | C and let's say it unknown processes (precipitation, ...) |
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228 | C ----------------------------------------------------------- |
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229 | C |
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230 | xaggdfe(ji,jj,jk)=2.*xlam1*rfact2/rjjss*max(0., |
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231 | & (trn(ji,jj,jk,jpfer)*1E9-1.))*trn(ji,jj,jk,jpfer) |
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232 | & *tmask(ji,jj,jk) |
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233 | # if defined key_off_degrad |
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234 | & *facvol(ji,jj,jk) |
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235 | # endif |
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236 | C |
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237 | END DO |
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238 | END DO |
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239 | END DO |
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240 | C |
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241 | #endif |
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242 | RETURN |
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243 | END |
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244 | |
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