1 | MODULE p4zlim |
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2 | !!====================================================================== |
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3 | !! *** MODULE p4zlim *** |
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4 | !! TOP : PISCES |
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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 | !! 3.4 ! 2011-04 (O. Aumont, C. Ethe) Limitation for iron modelled in quota |
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9 | !!---------------------------------------------------------------------- |
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10 | #if defined key_pisces |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_pisces' PISCES bio-model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! p4z_lim : Compute the nutrients limitation terms |
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15 | !! p4z_lim_init : Read the namelist |
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16 | !!---------------------------------------------------------------------- |
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17 | USE oce_trc ! Shared ocean-passive tracers variables |
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18 | USE trc ! Tracers defined |
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19 | USE sms_pisces ! PISCES variables |
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20 | USE p4zopt ! Optical |
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21 | |
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22 | IMPLICIT NONE |
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23 | PRIVATE |
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24 | |
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25 | PUBLIC p4z_lim |
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26 | PUBLIC p4z_lim_init |
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27 | |
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28 | !! * Shared module variables |
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29 | REAL(wp), PUBLIC :: conc0 = 2.e-6_wp !: NO3, PO4 half saturation |
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30 | REAL(wp), PUBLIC :: conc1 = 8.e-6_wp !: Phosphate half saturation for diatoms |
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31 | REAL(wp), PUBLIC :: conc2 = 1.e-9_wp !: Iron half saturation for nanophyto |
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32 | REAL(wp), PUBLIC :: conc2m = 3.e-9_wp !: Max iron half saturation for nanophyto |
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33 | REAL(wp), PUBLIC :: conc3 = 2.e-9_wp !: Iron half saturation for diatoms |
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34 | REAL(wp), PUBLIC :: conc3m = 8.e-9_wp !: Max iron half saturation for diatoms |
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35 | REAL(wp), PUBLIC :: xsizedia = 5.e-7_wp !: Minimum size criteria for diatoms |
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36 | REAL(wp), PUBLIC :: xsizephy = 1.e-6_wp !: Minimum size criteria for nanophyto |
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37 | REAL(wp), PUBLIC :: concnnh4 = 1.e-7_wp !: NH4 half saturation for phyto |
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38 | REAL(wp), PUBLIC :: concdnh4 = 4.e-7_wp !: NH4 half saturation for diatoms |
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39 | REAL(wp), PUBLIC :: xksi1 = 2.E-6_wp !: half saturation constant for Si uptake |
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40 | REAL(wp), PUBLIC :: xksi2 = 3.33e-6_wp !: half saturation constant for Si/C |
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41 | REAL(wp), PUBLIC :: xkdoc = 417.e-6_wp !: 2nd half-sat. of DOC remineralization |
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42 | REAL(wp), PUBLIC :: concfebac = 1.E-11_wp !: Fe half saturation for bacteria |
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43 | REAL(wp), PUBLIC :: qnfelim = 7.E-6_wp !: optimal Fe quota for nanophyto |
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44 | REAL(wp), PUBLIC :: qdfelim = 7.E-6_wp !: optimal Fe quota for diatoms |
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45 | REAL(wp), PUBLIC :: caco3r = 0.16_wp !: mean rainratio |
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46 | |
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47 | ! Coefficient for iron limitation |
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48 | REAL(wp) :: xcoef1 = 0.0016 / 55.85 |
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49 | REAL(wp) :: xcoef2 = 1.21E-5 * 14. / 55.85 / 7.625 * 0.5 * 1.5 |
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50 | REAL(wp) :: xcoef3 = 1.15E-4 * 14. / 55.85 / 7.625 * 0.5 |
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51 | !!* Substitution |
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52 | # include "top_substitute.h90" |
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53 | !!---------------------------------------------------------------------- |
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54 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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55 | !! $Id$ |
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56 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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57 | !!---------------------------------------------------------------------- |
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58 | |
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59 | CONTAINS |
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60 | |
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61 | SUBROUTINE p4z_lim( kt ) |
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62 | !!--------------------------------------------------------------------- |
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63 | !! *** ROUTINE p4z_lim *** |
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64 | !! |
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65 | !! ** Purpose : Compute the co-limitations by the various nutrients |
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66 | !! for the various phytoplankton species |
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67 | !! |
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68 | !! ** Method : - ??? |
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69 | !!--------------------------------------------------------------------- |
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70 | ! |
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71 | INTEGER, INTENT(in) :: kt |
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72 | ! |
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73 | INTEGER :: ji, jj, jk |
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74 | REAL(wp) :: zlim1, zlim2, zlim3, zlim4, zno3, zferlim |
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75 | REAL(wp) :: zconcd, zconcd2, zconcn, zconcn2 |
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76 | REAL(wp) :: z1_trndia, z1_trnphy, ztem1, ztem2, zetot1, zetot2 |
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77 | REAL(wp) :: zdenom, zratio, zironmin |
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78 | REAL(wp) :: zconc1d, zconc1dnh4, zconc0n, zconc0nnh4 |
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79 | !!--------------------------------------------------------------------- |
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80 | ! |
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81 | IF( nn_timing == 1 ) CALL timing_start('p4z_lim') |
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82 | ! |
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83 | DO jk = 1, jpkm1 |
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84 | DO jj = 1, jpj |
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85 | DO ji = 1, jpi |
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86 | |
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87 | ! Tuning of the iron concentration to a minimum level that is set to the detection limit |
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88 | !------------------------------------- |
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89 | zno3 = trn(ji,jj,jk,jpno3) / 40.e-6 |
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90 | zferlim = MAX( 2e-11 * zno3 * zno3, 5e-12 ) |
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91 | zferlim = MIN( zferlim, 3e-11 ) |
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92 | trn(ji,jj,jk,jpfer) = MAX( trn(ji,jj,jk,jpfer), zferlim ) |
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93 | |
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94 | ! Computation of a variable Ks for iron on diatoms taking into account |
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95 | ! that increasing biomass is made of generally bigger cells |
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96 | !------------------------------------------------ |
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97 | zconcd = MAX( 0.e0 , trn(ji,jj,jk,jpdia) - xsizedia ) |
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98 | zconcd2 = trn(ji,jj,jk,jpdia) - zconcd |
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99 | zconcn = MAX( 0.e0 , trn(ji,jj,jk,jpphy) - xsizephy ) |
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100 | zconcn2 = trn(ji,jj,jk,jpphy) - zconcn |
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101 | z1_trnphy = 1. / ( trn(ji,jj,jk,jpphy) + rtrn ) |
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102 | z1_trndia = 1. / ( trn(ji,jj,jk,jpdia) + rtrn ) |
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103 | |
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104 | concdfe(ji,jj,jk) = MAX( conc3 , ( zconcd2 * conc3 + conc3m * zconcd ) * z1_trndia ) |
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105 | zconc1d = MAX( 2.* conc0 , ( zconcd2 * 2. * conc0 + conc1 * zconcd ) * z1_trndia ) |
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106 | zconc1dnh4 = MAX( 2.* concnnh4, ( zconcd2 * 2. * concnnh4 + concdnh4 * zconcd ) * z1_trndia ) |
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107 | |
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108 | concnfe(ji,jj,jk) = MAX( conc2 , ( zconcn2 * conc2 + conc2m * zconcn ) * z1_trnphy ) |
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109 | zconc0n = MAX( conc0 , ( zconcn2 * conc0 + 2. * conc0 * zconcn ) * z1_trnphy ) |
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110 | zconc0nnh4 = MAX( concnnh4 , ( zconcn2 * concnnh4 + 2. * concnnh4 * zconcn ) * z1_trnphy ) |
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111 | |
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112 | ! Michaelis-Menten Limitation term for nutrients Small flagellates |
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113 | ! ----------------------------------------------- |
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114 | zdenom = 1. / ( zconc0n * zconc0nnh4 + zconc0nnh4 * trn(ji,jj,jk,jpno3) + zconc0n * trn(ji,jj,jk,jpnh4) ) |
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115 | xnanono3(ji,jj,jk) = trn(ji,jj,jk,jpno3) * zconc0nnh4 * zdenom |
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116 | xnanonh4(ji,jj,jk) = trn(ji,jj,jk,jpnh4) * zconc0n * zdenom |
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117 | ! |
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118 | zlim1 = xnanono3(ji,jj,jk) + xnanonh4(ji,jj,jk) |
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119 | zlim2 = trn(ji,jj,jk,jppo4) / ( trn(ji,jj,jk,jppo4) + zconc0nnh4 ) |
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120 | zratio = trn(ji,jj,jk,jpnfe) * z1_trnphy |
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121 | zironmin = xcoef1 * trn(ji,jj,jk,jpnch) * z1_trnphy + xcoef2 * zlim1 + xcoef3 * xnanono3(ji,jj,jk) |
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122 | zlim3 = MAX( 0.,( zratio - zironmin ) / qnfelim ) |
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123 | xlimnfe(ji,jj,jk) = MIN( 1., zlim3 ) |
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124 | xlimphy(ji,jj,jk) = MIN( zlim1, zlim2, zlim3 ) |
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125 | ! |
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126 | zlim1 = trn(ji,jj,jk,jpnh4) / ( concnnh4 + trn(ji,jj,jk,jpnh4) ) |
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127 | zlim3 = trn(ji,jj,jk,jpfer) / ( concfebac+ trn(ji,jj,jk,jpfer) ) |
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128 | zlim4 = trn(ji,jj,jk,jpdoc) / ( xkdoc + trn(ji,jj,jk,jpdoc) ) |
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129 | xlimbac(ji,jj,jk) = MIN( zlim1, zlim2, zlim3 ) * zlim4 |
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130 | |
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131 | ! Michaelis-Menten Limitation term for nutrients Diatoms |
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132 | ! ---------------------------------------------- |
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133 | zdenom = 1. / ( zconc1d * zconc1dnh4 + zconc1dnh4 * trn(ji,jj,jk,jpno3) + zconc1d * trn(ji,jj,jk,jpnh4) ) |
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134 | xdiatno3(ji,jj,jk) = trn(ji,jj,jk,jpno3) * zconc1dnh4 * zdenom |
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135 | xdiatnh4(ji,jj,jk) = trn(ji,jj,jk,jpnh4) * zconc1d * zdenom |
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136 | ! |
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137 | zlim1 = xdiatno3(ji,jj,jk) + xdiatnh4(ji,jj,jk) |
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138 | zlim2 = trn(ji,jj,jk,jppo4) / ( trn(ji,jj,jk,jppo4) + zconc1dnh4 ) |
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139 | zlim3 = trn(ji,jj,jk,jpsil) / ( trn(ji,jj,jk,jpsil) + xksi(ji,jj) ) |
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140 | zratio = trn(ji,jj,jk,jpdfe)/(trn(ji,jj,jk,jpdia)+rtrn) |
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141 | zironmin = xcoef1 * trn(ji,jj,jk,jpdch) * z1_trndia + xcoef2 * zlim1 + xcoef3 * xdiatno3(ji,jj,jk) |
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142 | zlim4 = MAX( 0., ( zratio - zironmin ) / qdfelim ) |
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143 | xlimdfe(ji,jj,jk) = MIN( 1., zlim4 ) |
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144 | xlimdia(ji,jj,jk) = MIN( zlim1, zlim2, zlim3, zlim4 ) |
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145 | xlimsi(ji,jj,jk) = MIN( zlim1, zlim2, zlim4 ) |
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146 | END DO |
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147 | END DO |
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148 | END DO |
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149 | |
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150 | ! Compute the fraction of nanophytoplankton that is made of calcifiers |
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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 | zlim1 = ( trn(ji,jj,jk,jpno3) * concnnh4 + trn(ji,jj,jk,jpnh4) * conc0 ) & |
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156 | & / ( conc0 * concnnh4 + concnnh4 * trn(ji,jj,jk,jpno3) + conc0 * trn(ji,jj,jk,jpnh4) ) |
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157 | zlim2 = trn(ji,jj,jk,jppo4) / ( trn(ji,jj,jk,jppo4) + concnnh4 ) |
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158 | zlim3 = trn(ji,jj,jk,jpfer) / ( trn(ji,jj,jk,jpfer) + concfebac ) |
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159 | ztem1 = MAX( 0., tsn(ji,jj,jk,jp_tem) ) |
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160 | ztem2 = tsn(ji,jj,jk,jp_tem) - 10. |
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161 | zetot1 = MAX( 0., etot(ji,jj,jk) - 1.) / ( 4. + etot(ji,jj,jk) ) |
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162 | zetot2 = 1. / ( 30. + etot(ji,jj,jk) ) |
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163 | |
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164 | xfracal(ji,jj,jk) = caco3r * MIN( zlim1, zlim2, zlim3 ) & |
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165 | & * ztem1 / ( 0.1 + ztem1 ) & |
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166 | & * MAX( 1., trn(ji,jj,jk,jpphy) * 1.e6 / 2. ) & |
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167 | & * 2.325 * zetot1 * 30. * zetot2 & |
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168 | & * ( 1. + EXP(-ztem2 * ztem2 / 25. ) ) & |
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169 | & * MIN( 1., 50. / ( hmld(ji,jj) + rtrn ) ) |
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170 | xfracal(ji,jj,jk) = MIN( 0.8 , xfracal(ji,jj,jk) ) |
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171 | xfracal(ji,jj,jk) = MAX( 0.02, xfracal(ji,jj,jk) ) |
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172 | END DO |
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173 | END DO |
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174 | END DO |
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175 | ! |
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176 | IF( nn_timing == 1 ) CALL timing_stop('p4z_lim') |
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177 | ! |
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178 | END SUBROUTINE p4z_lim |
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179 | |
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180 | SUBROUTINE p4z_lim_init |
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181 | |
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182 | !!---------------------------------------------------------------------- |
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183 | !! *** ROUTINE p4z_lim_init *** |
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184 | !! |
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185 | !! ** Purpose : Initialization of nutrient limitation parameters |
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186 | !! |
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187 | !! ** Method : Read the nampislim namelist and check the parameters |
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188 | !! called at the first timestep (nittrc000) |
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189 | !! |
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190 | !! ** input : Namelist nampislim |
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191 | !! |
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192 | !!---------------------------------------------------------------------- |
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193 | |
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194 | NAMELIST/nampislim/ conc0, conc1, conc2, conc2m, conc3, conc3m, & |
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195 | & xsizedia, xsizephy, concnnh4, concdnh4, & |
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196 | & xksi1, xksi2, xkdoc, concfebac, qnfelim, qdfelim, caco3r |
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197 | |
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198 | REWIND( numnatp ) ! read numnat |
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199 | READ ( numnatp, nampislim ) |
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200 | |
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201 | IF(lwp) THEN ! control print |
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202 | WRITE(numout,*) ' ' |
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203 | WRITE(numout,*) ' Namelist parameters for nutrient limitations, nampislim' |
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204 | WRITE(numout,*) ' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~' |
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205 | WRITE(numout,*) ' mean rainratio caco3r = ', caco3r |
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206 | WRITE(numout,*) ' NO3, PO4 half saturation conc0 = ', conc0 |
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207 | WRITE(numout,*) ' half saturation constant for Si uptake xksi1 = ', xksi1 |
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208 | WRITE(numout,*) ' half saturation constant for Si/C xksi2 = ', xksi2 |
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209 | WRITE(numout,*) ' 2nd half-sat. of DOC remineralization xkdoc = ', xkdoc |
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210 | WRITE(numout,*) ' Phosphate half saturation for diatoms conc1 = ', conc1 |
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211 | WRITE(numout,*) ' Iron half saturation for phyto conc2 = ', conc2 |
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212 | WRITE(numout,*) ' Max iron half saturation for phyto conc2m = ', conc2m |
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213 | WRITE(numout,*) ' Iron half saturation for diatoms conc3 = ', conc3 |
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214 | WRITE(numout,*) ' Maxi iron half saturation for diatoms conc3m = ', conc3m |
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215 | WRITE(numout,*) ' Minimum size criteria for diatoms xsizedia = ', xsizedia |
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216 | WRITE(numout,*) ' Minimum size criteria for nanophyto xsizephy = ', xsizephy |
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217 | WRITE(numout,*) ' NH4 half saturation for phyto concnnh4 = ', concnnh4 |
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218 | WRITE(numout,*) ' NH4 half saturation for diatoms concdnh4 = ', concdnh4 |
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219 | WRITE(numout,*) ' Fe half saturation for bacteria concfebac = ', concfebac |
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220 | WRITE(numout,*) ' optimal Fe quota for nano. qnfelim = ', qnfelim |
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221 | WRITE(numout,*) ' Optimal Fe quota for diatoms qdfelim = ', qdfelim |
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222 | ENDIF |
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223 | |
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224 | END SUBROUTINE p4z_lim_init |
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225 | |
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226 | #else |
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227 | !!====================================================================== |
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228 | !! Dummy module : No PISCES bio-model |
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229 | !!====================================================================== |
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230 | CONTAINS |
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231 | SUBROUTINE p4z_lim ! Empty routine |
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232 | END SUBROUTINE p4z_lim |
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233 | #endif |
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234 | |
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235 | !!====================================================================== |
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236 | END MODULE p4zlim |
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