1 | MODULE p4zrem |
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2 | !!====================================================================== |
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3 | !! *** MODULE p4zrem *** |
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4 | !! TOP : PISCES Compute remineralization/scavenging of organic compounds |
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5 | !!====================================================================== |
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6 | !! History : 1.0 ! 2004 (O. Aumont) Original code |
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7 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 |
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8 | !!---------------------------------------------------------------------- |
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9 | #if defined key_pisces |
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10 | !!---------------------------------------------------------------------- |
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11 | !! 'key_top' and TOP models |
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12 | !! 'key_pisces' PISCES bio-model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! p4z_rem : Compute remineralization/scavenging of organic compounds |
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15 | !!---------------------------------------------------------------------- |
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16 | USE oce_trc ! |
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17 | USE trp_trc ! |
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18 | USE sms ! |
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19 | |
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20 | IMPLICIT NONE |
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21 | PRIVATE |
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22 | |
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23 | PUBLIC p4z_rem ! called in p4zbio.F90 |
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24 | |
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25 | !!* Substitution |
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26 | # include "domzgr_substitute.h90" |
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27 | !!---------------------------------------------------------------------- |
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28 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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29 | !! $Header:$ |
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30 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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31 | !!---------------------------------------------------------------------- |
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32 | |
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33 | CONTAINS |
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34 | |
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35 | SUBROUTINE p4z_rem |
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36 | !!--------------------------------------------------------------------- |
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37 | !! *** ROUTINE p4z_rem *** |
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38 | !! |
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39 | !! ** Purpose : Compute remineralization/scavenging of organic compounds |
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40 | !! |
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41 | !! ** Method : - ??? |
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42 | !!--------------------------------------------------------------------- |
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43 | INTEGER :: ji, jj, jk |
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44 | REAL(wp) :: zremip, zremik , zlam1b |
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45 | REAL(wp) :: zkeq , zfeequi, zsiremin |
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46 | REAL(wp) :: zsatur, zsatur2, znusil |
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47 | REAL(wp) :: zlamfac, zstep |
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48 | REAL(wp), DIMENSION(jpi,jpj) :: ztempbac |
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49 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zdepbac, zfesatur |
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50 | !!--------------------------------------------------------------------- |
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51 | |
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52 | zstep = rfact2 / rjjss ! Time step duration for the biology |
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53 | |
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54 | |
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55 | ! Computation of the mean phytoplankton concentration as |
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56 | ! a crude estimate of the bacterial biomass |
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57 | ! -------------------------------------------------- |
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58 | |
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59 | DO jk = 1, jpkm1 |
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60 | DO jj = 1, jpj |
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61 | DO ji = 1, jpi |
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62 | IF( fsdept(ji,jj,jk) < 120. ) THEN |
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63 | zdepbac(ji,jj,jk) = MIN( 0.7 * ( trn(ji,jj,jk,jpzoo) + 2.* trn(ji,jj,jk,jpmes) ), 4.e-6 ) |
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64 | ztempbac(ji,jj) = zdepbac(ji,jj,jk) |
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65 | ELSE |
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66 | zdepbac(ji,jj,jk) = MIN( 1., 120./ fsdept(ji,jj,jk) ) * ztempbac(ji,jj) |
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67 | ENDIF |
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68 | END DO |
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69 | END DO |
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70 | END DO |
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71 | |
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72 | DO jk = 1, jpkm1 |
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73 | DO jj = 1, jpj |
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74 | DO ji = 1, jpi |
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75 | |
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76 | ! DENITRIFICATION FACTOR COMPUTED FROM O2 LEVELS |
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77 | ! ---------------------------------------------- |
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78 | |
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79 | nitrfac(ji,jj,jk) = MAX( 0.e0, 0.4 * ( 6.e-6 - trn(ji,jj,jk,jpoxy) ) & |
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80 | & / ( oxymin + trn(ji,jj,jk,jpoxy) ) ) |
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81 | END DO |
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82 | END DO |
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83 | END DO |
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84 | |
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85 | nitrfac(:,:,:) = MIN( 1., nitrfac(:,:,:) ) |
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86 | |
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87 | DO jk = 1, jpkm1 |
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88 | DO jj = 1, jpj |
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89 | DO ji = 1, jpi |
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90 | |
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91 | ! DOC ammonification. Depends on depth, phytoplankton biomass |
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92 | ! and a limitation term which is supposed to be a parameterization |
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93 | ! of the bacterial activity. |
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94 | ! ---------------------------------------------------------------- |
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95 | zremik = xremik * zstep / 1.e-6 * xlimbac(ji,jj,jk) & |
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96 | # if defined key_off_degrad |
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97 | & * facvol(ji,jj,jk) & |
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98 | # endif |
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99 | & * zdepbac(ji,jj,jk) |
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100 | zremik = MAX( zremik, 5.5e-4 * zstep ) |
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101 | |
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102 | ! Ammonification in oxic waters with oxygen consumption |
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103 | ! ----------------------------------------------------- |
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104 | olimi(ji,jj,jk) = MIN( ( trn(ji,jj,jk,jpoxy) - rtrn ) / o2ut, & |
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105 | & zremik * ( 1.- nitrfac(ji,jj,jk) ) * trn(ji,jj,jk,jpdoc) ) |
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106 | |
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107 | ! Ammonification in suboxic waters with denitrification |
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108 | ! ------------------------------------------------------- |
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109 | denitr(ji,jj,jk) = MIN( ( trn(ji,jj,jk,jpno3) - rtrn ) / rdenit, & |
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110 | & zremik * nitrfac(ji,jj,jk) * trn(ji,jj,jk,jpdoc) ) |
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111 | END DO |
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112 | END DO |
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113 | END DO |
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114 | |
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115 | olimi (:,:,:) = MAX( 0.e0, olimi (:,:,:) ) |
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116 | denitr(:,:,:) = MAX( 0.e0, denitr(:,:,:) ) |
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117 | |
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118 | DO jk = 1, jpkm1 |
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119 | DO jj = 1, jpj |
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120 | DO ji = 1, jpi |
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121 | |
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122 | ! NH4 nitrification to NO3. Ceased for oxygen concentrations |
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123 | ! below 2 umol/L. Inhibited at strong light |
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124 | ! ---------------------------------------------------------- |
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125 | onitr(ji,jj,jk) = nitrif * zstep * trn(ji,jj,jk,jpnh4) / ( 1.+ emoy(ji,jj,jk) ) & |
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126 | # if defined key_off_degrad |
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127 | & * facvol(ji,jj,jk) & |
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128 | # endif |
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129 | & * ( 1.- nitrfac(ji,jj,jk) ) |
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130 | END DO |
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131 | END DO |
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132 | END DO |
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133 | |
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134 | DO jk = 1, jpkm1 |
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135 | DO jj = 1, jpj |
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136 | DO ji = 1, jpi |
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137 | |
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138 | ! Bacterial uptake of iron. No iron is available in DOC. So |
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139 | ! Bacteries are obliged to take up iron from the water. Some |
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140 | ! studies (especially at Papa) have shown this uptake to be |
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141 | ! significant |
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142 | ! ---------------------------------------------------------- |
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143 | xbactfer(ji,jj,jk) = 15.e-6 * rfact2 * 4.* 0.4 * prmax(ji,jj,jk) & |
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144 | & * ( xlimphy(ji,jj,jk) * zdepbac(ji,jj,jk))**2 & |
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145 | & / ( xkgraz2 + zdepbac(ji,jj,jk) ) & |
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146 | & * ( 0.5 + SIGN( 0.5, trn(ji,jj,jk,jpfer) -2.e-11 ) ) |
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147 | |
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148 | END DO |
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149 | END DO |
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150 | END DO |
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151 | |
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152 | DO jk = 1, jpkm1 |
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153 | DO jj = 1, jpj |
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154 | DO ji = 1, jpi |
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155 | |
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156 | ! POC disaggregation by turbulence and bacterial activity. |
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157 | ! ------------------------------------------------------------- |
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158 | zremip = xremip * zstep * tgfunc(ji,jj,jk) & |
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159 | # if defined key_off_degrad |
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160 | & * facvol(ji,jj,jk) & |
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161 | # endif |
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162 | & * ( 1.- 0.5 * nitrfac(ji,jj,jk) ) |
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163 | |
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164 | ! POC disaggregation rate is reduced in anoxic zone as shown by |
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165 | ! sediment traps data. In oxic area, the exponent of the martin s |
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166 | ! law is around -0.87. In anoxic zone, it is around -0.35. This |
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167 | ! means a disaggregation constant about 0.5 the value in oxic zones |
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168 | ! ----------------------------------------------------------------- |
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169 | orem (ji,jj,jk) = zremip * trn(ji,jj,jk,jppoc) |
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170 | ofer (ji,jj,jk) = zremip * trn(ji,jj,jk,jpsfe) |
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171 | #if ! defined key_kriest |
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172 | orem2(ji,jj,jk) = zremip * trn(ji,jj,jk,jpgoc) |
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173 | ofer2(ji,jj,jk) = zremip * trn(ji,jj,jk,jpbfe) |
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174 | #else |
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175 | orem2(ji,jj,jk) = zremip * trn(ji,jj,jk,jpnum) |
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176 | #endif |
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177 | END DO |
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178 | END DO |
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179 | END DO |
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180 | |
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181 | DO jk = 1, jpkm1 |
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182 | DO jj = 1, jpj |
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183 | DO ji = 1, jpi |
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184 | |
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185 | ! Remineralization rate of BSi depedant on T and saturation |
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186 | ! --------------------------------------------------------- |
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187 | zsatur = ( sio3eq(ji,jj,jk) - trn(ji,jj,jk,jpsil) ) / ( sio3eq(ji,jj,jk) + rtrn ) |
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188 | zsatur = MAX( rtrn, zsatur ) |
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189 | zsatur2 = zsatur * ( 1. + tn(ji,jj,jk) / 400.)**4 |
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190 | znusil = 0.225 * ( 1. + tn(ji,jj,jk) / 15.) * zsatur + 0.775 * zsatur2**9 |
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191 | # if defined key_off_degrad |
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192 | zsiremin = xsirem * zstep * znusil * facvol(ji,jj,jk) |
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193 | # else |
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194 | zsiremin = xsirem * zstep * znusil |
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195 | # endif |
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196 | osil(ji,jj,jk) = zsiremin * trn(ji,jj,jk,jpdsi) |
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197 | ! |
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198 | END DO |
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199 | END DO |
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200 | END DO |
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201 | |
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202 | zfesatur(:,:,:) = 0.6e-9 |
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203 | |
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204 | DO jk = 1, jpkm1 |
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205 | DO jj = 1, jpj |
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206 | DO ji = 1, jpi |
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207 | |
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208 | ! scavenging rate of iron. this scavenging rate depends on the |
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209 | ! load in particles on which they are adsorbed. The |
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210 | ! parameterization has been taken from studies on Th |
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211 | ! ------------------------------------------------------------ |
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212 | zkeq = fekeq(ji,jj,jk) |
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213 | zfeequi = ( -( 1. + zfesatur(ji,jj,jk) * zkeq - zkeq * trn(ji,jj,jk,jpfer) ) & |
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214 | & + SQRT( ( 1. + zfesatur(ji,jj,jk) * zkeq - zkeq * trn(ji,jj,jk,jpfer) )**2 & |
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215 | & + 4. * trn(ji,jj,jk,jpfer) * zkeq) ) / ( 2. * zkeq ) |
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216 | #if ! defined key_kriest |
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217 | zlam1b = 3.e-5 + xlam1 * ( trn(ji,jj,jk,jppoc) + trn(ji,jj,jk,jpgoc) & |
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218 | & + trn(ji,jj,jk,jpcal) + trn(ji,jj,jk,jpdsi) ) * 1.e6 |
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219 | #else |
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220 | zlam1b = 3.e-5 + xlam1 * ( trn(ji,jj,jk,jppoc) & |
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221 | & + trn(ji,jj,jk,jpcal) + trn(ji,jj,jk,jpdsi) ) * 1.e6 |
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222 | #endif |
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223 | # if defined key_off_degrad |
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224 | xscave(ji,jj,jk) = zfeequi * zlam1b * zstep * facvol(ji,jj,jk) |
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225 | # else |
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226 | xscave(ji,jj,jk) = zfeequi * zlam1b * zstep |
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227 | # endif |
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228 | |
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229 | ! Increased scavenging for very high iron concentrations |
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230 | ! found near the coasts due to increased lithogenic particles |
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231 | ! and let s say it unknown processes (precipitation, ...) |
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232 | ! ----------------------------------------------------------- |
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233 | zlamfac = MAX( 0.e0, ( gphit(ji,jj) + 55.) / 30. ) |
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234 | zlamfac = MIN( 1. , zlamfac ) |
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235 | #if ! defined key_kriest |
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236 | zlam1b = ( 80.* ( trn(ji,jj,jk,jpdoc) + 35.e-6 ) & |
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237 | & + 698.* trn(ji,jj,jk,jppoc) + 1.05e4 * trn(ji,jj,jk,jpgoc) ) & |
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238 | & * zdiss(ji,jj,jk) + 1E-4 * (1.-zlamfac) & |
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239 | & + xlam1 * MAX( 0.e0, ( trn(ji,jj,jk,jpfer) * 1.e9 - 1.) ) |
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240 | #else |
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241 | zlam1b = ( 80.* (trn(ji,jj,jk,jpdoc) + 35E-6) & |
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242 | & + 698.* trn(ji,jj,jk,jppoc) ) & |
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243 | & * zdiss(ji,jj,jk) + 1E-4 * (1.-zlamfac) & |
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244 | & + xlam1 * MAX( 0.e0, ( trn(ji,jj,jk,jpfer) * 1.e9 - 1.) ) |
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245 | #endif |
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246 | |
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247 | # if defined key_off_degrad |
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248 | xaggdfe(ji,jj,jk) = zlam1b * zstep * 0.5 * ( trn(ji,jj,jk,jpfer) - zfeequi ) * facvol(ji,jj,jk) |
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249 | # else |
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250 | xaggdfe(ji,jj,jk) = zlam1b * zstep * 0.5 * ( trn(ji,jj,jk,jpfer) - zfeequi ) |
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251 | # endif |
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252 | END DO |
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253 | END DO |
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254 | END DO |
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255 | ! |
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256 | END SUBROUTINE p4z_rem |
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257 | |
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258 | #else |
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259 | !!====================================================================== |
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260 | !! Dummy module : No PISCES bio-model |
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261 | !!====================================================================== |
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262 | CONTAINS |
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263 | SUBROUTINE p4z_rem ! Empty routine |
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264 | END SUBROUTINE p4z_rem |
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265 | #endif |
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266 | |
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267 | !!====================================================================== |
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268 | END MODULE p4zrem |
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