1 | MODULE trcdms_medusa |
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2 | !!====================================================================== |
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3 | !! *** MODULE trcdms_medusa *** |
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4 | !! TOP : MEDUSA |
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5 | !!====================================================================== |
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6 | !! History : |
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7 | !! - ! 2014-08 (J. Palmieri - A. Yool) added for UKESM1 project |
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8 | !! - ! 2017-05 (A. Yool) add extra Anderson scheme |
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9 | !!---------------------------------------------------------------------- |
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10 | #if defined key_medusa && defined key_roam |
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11 | !!---------------------------------------------------------------------- |
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12 | !! MEDUSA DMS surface concentration |
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13 | !!---------------------------------------------------------------------- |
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14 | !! trc_dms_medusa : |
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15 | !!---------------------------------------------------------------------- |
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16 | USE oce_trc |
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17 | USE trc |
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18 | USE sms_medusa |
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19 | USE lbclnk |
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20 | USE prtctl_trc ! Print control for debugging |
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21 | USE in_out_manager ! I/O manager |
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22 | |
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23 | IMPLICIT NONE |
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24 | PRIVATE |
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25 | |
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26 | PUBLIC trc_dms_medusa ! called in trc_bio_medusa |
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27 | |
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28 | !!* Substitution |
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29 | # include "domzgr_substitute.h90" |
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30 | !!---------------------------------------------------------------------- |
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31 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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32 | !! $Id$ |
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33 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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34 | !!---------------------------------------------------------------------- |
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35 | |
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36 | |
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37 | CONTAINS |
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38 | |
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39 | !======================================================================= |
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40 | ! |
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41 | SUBROUTINE trc_dms_medusa( chn, chd, mld, xqsr, xdin, xlim, & !! inputs |
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42 | & dms_andr, dms_simo, dms_aran, dms_hall, dms_andm) !! outputs |
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43 | ! |
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44 | !======================================================================= |
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45 | !! |
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46 | !! Title : Calculates DMS ocean surface concentration |
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47 | !! Author : Julien Palmieri and Andrew Yool |
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48 | !! Date : 08/08/14 |
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49 | !! |
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50 | !! DMS module is called in trc_bio's huge jk,jj,ji loop |
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51 | !! --> DMS concentration is calculated in a specific cell |
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52 | !! (no need of ji,jj,jk) |
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53 | !! |
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54 | !! AXY (13/03/15): amend to include all four schemes tested |
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55 | !! during winter/spring 2015; these are: |
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56 | !! |
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57 | !! 1. Anderson et al. (2001); this uses fields |
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58 | !! of surface chl, irradiance and nutrients |
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59 | !! to empirically estimate DMS via a broken |
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60 | !! stick approach |
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61 | !! |
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62 | !! 2. Simo & Dachs (2002); this uses fields of |
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63 | !! surface chl and mixed layer depth |
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64 | !! |
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65 | !! 3. Aranami & Tsunogai (2004); this is an |
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66 | !! embellishment of Simo & Dachs |
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67 | !! |
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68 | !! 4. Halloran et al. (2010); this is an |
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69 | !! alternative embellishment of Sim & Dachs |
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70 | !! and is included because it is formally |
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71 | !! published (and different from the above) |
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72 | !! |
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73 | !! AXY (25/05/17): add extra "corrected" Anderson scheme |
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74 | !! |
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75 | !! 5. As Anderson et al. (2001) but modified to |
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76 | !! more accurately reflect nutrient limitation |
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77 | !! status of phytoplankton community |
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78 | !! |
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79 | !! AXY (08/07/15): amend to remove Julien's original calculation |
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80 | !! as this is now superfluous; the four schemes |
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81 | !! are calculated and one is chosen to be passed |
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82 | !! to the atmosphere in trc_bio_medusa |
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83 | !! |
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84 | !======================================================================= |
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85 | |
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86 | IMPLICIT NONE |
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87 | ! |
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88 | REAL(wp), INTENT( in ) :: chn !! non-diatom chlorophyll (mg/m3) |
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89 | REAL(wp), INTENT( in ) :: chd !! diatom chlorophyll (mg/m3) |
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90 | REAL(wp), INTENT( in ) :: mld !! mix layer depth (m) |
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91 | REAL(wp), INTENT( in ) :: xqsr !! surface irradiance (W/m2) |
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92 | REAL(wp), INTENT( in ) :: xdin !! surface DIN (mmol N/m3) |
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93 | REAL(wp), INTENT( in ) :: xlim !! surface DIN limitation (mmol N/m3) |
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94 | REAL(wp), INTENT( inout ) :: dms_andr !! DMS surface concentration (nmol/L) |
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95 | REAL(wp), INTENT( inout ) :: dms_simo !! DMS surface concentration (nmol/L) |
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96 | REAL(wp), INTENT( inout ) :: dms_aran !! DMS surface concentration (nmol/L) |
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97 | REAL(wp), INTENT( inout ) :: dms_hall !! DMS surface concentration (nmol/L) |
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98 | REAL(wp), INTENT( inout ) :: dms_andm !! DMS surface concentration (nmol/L) |
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99 | ! |
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100 | REAL(wp) :: CHL, cmr, sw_dms |
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101 | REAL(wp) :: Jterm, Qterm |
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102 | !! temporary variables |
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103 | REAL(wp) :: fq1,fq2,fq3 |
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104 | ! |
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105 | !======================================================================= |
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106 | ! |
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107 | ! AXY (13/03/15): per remarks above, the following calculations estimate |
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108 | ! DMS using all of the schemes examined for UKESM1 |
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109 | ! |
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110 | CHL = 0.0 |
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111 | CHL = chn+chd !! mg/m3 |
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112 | cmr = CHL / mld |
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113 | ! |
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114 | ! AXY (13/03/15): Anderson et al. (2001) |
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115 | Jterm = xqsr + 1.0e-6 |
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116 | !! this next line makes a hard-coded assumption about the |
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117 | !! half-saturation constant of MEDUSA (which should be |
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118 | !! done properly; perhaps even scaled with the proportion |
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119 | !! of diatoms and non-diatoms) |
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120 | Qterm = xdin / (xdin + 0.5) |
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121 | fq1 = log10(CHL * Jterm * Qterm) |
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122 | if (fq1 > 1.72) then |
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123 | dms_andr = (8.24 * (fq1 - 1.72)) + 2.29 |
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124 | else |
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125 | dms_andr = 2.29 |
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126 | endif |
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127 | ! |
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128 | ! AXY (13/03/15): Simo & Dachs (2002) |
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129 | fq1 = (-1.0 * log(mld)) + 5.7 |
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130 | fq2 = (55.8 * cmr) + 0.6 |
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131 | if (cmr < 0.02) then |
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132 | dms_simo = fq1 |
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133 | else |
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134 | dms_simo = fq2 |
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135 | endif |
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136 | ! |
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137 | ! AXY (13/03/15): Aranami & Tsunogai (2004) |
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138 | fq1 = 60.0 / mld |
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139 | fq2 = (55.8 * cmr) + 0.6 |
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140 | if (cmr < 0.02) then |
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141 | dms_aran = fq1 |
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142 | else |
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143 | dms_aran = fq2 |
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144 | endif |
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145 | ! |
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146 | ! AXY (13/03/15): Halloran et al. (2010) |
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147 | fq1 = (-1.0 * log(mld)) + 5.7 |
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148 | fq2 = (55.8 * cmr) + 0.6 |
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149 | fq3 = (90.0 / mld) |
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150 | if (cmr < 0.02) then |
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151 | dms_hall = fq1 |
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152 | else |
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153 | dms_hall = fq2 |
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154 | endif |
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155 | if (mld > 182.5) then |
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156 | dms_hall = fq3 |
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157 | endif |
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158 | ! |
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159 | ! AXY (25/05/17): modified Anderson et al. (2001) |
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160 | Jterm = xqsr + 1.0e-6 |
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161 | !! this version fixes the hard-coded assumption above |
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162 | Qterm = xlim |
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163 | fq1 = log10(CHL * Jterm * Qterm) |
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164 | if (fq1 > 1.72) then |
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165 | dms_andm = (8.24 * (fq1 - 1.72)) + 2.29 |
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166 | else |
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167 | dms_andm = 2.29 |
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168 | endif |
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169 | |
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170 | END SUBROUTINE trc_dms_medusa |
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171 | |
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172 | |
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173 | !======================================================================= |
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174 | !======================================================================= |
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175 | !======================================================================= |
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176 | |
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177 | #else |
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178 | !!====================================================================== |
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179 | !! Dummy module : No MEDUSA bio-model |
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180 | !!====================================================================== |
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181 | |
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182 | CONTAINS |
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183 | |
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184 | !======================================================================= |
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185 | ! |
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186 | SUBROUTINE trc_dms_medusa( kt ) !! EMPTY Routine |
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187 | ! |
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188 | ! |
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189 | INTEGER, INTENT( in ) :: kt |
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190 | ! |
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191 | |
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192 | WRITE(*,*) 'trc_dms_medusa: You should not have seen this print! error?' |
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193 | |
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194 | END SUBROUTINE trc_dms_medusa |
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195 | #endif |
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196 | |
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197 | !!====================================================================== |
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198 | END MODULE trcdms_medusa |
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199 | |
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200 | |
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201 | |
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