1 | MODULE p4zrem |
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2 | !!====================================================================== |
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3 | !! *** MODULE p4zrem *** |
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4 | !! TOP : PISCES Compute remineralization/dissolution of organic compounds |
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5 | !! except for POC which is treated in p4zpoc.F90 |
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6 | !! This module is common to both PISCES and PISCES-QUOTA |
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7 | !!========================================================================= |
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8 | !! History : 1.0 ! 2004 (O. Aumont) Original code |
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9 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 |
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10 | !! 3.4 ! 2011-06 (O. Aumont, C. Ethe) Quota model for iron |
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11 | !!---------------------------------------------------------------------- |
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12 | !! p4z_rem : Compute remineralization/dissolution of organic compounds |
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13 | !! p4z_rem_init : Initialisation of parameters for remineralisation |
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14 | !! p4z_rem_alloc : Allocate remineralisation variables |
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15 | !!---------------------------------------------------------------------- |
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16 | USE oce_trc ! shared variables between ocean and passive tracers |
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17 | USE trc ! passive tracers common variables |
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18 | USE sms_pisces ! PISCES Source Minus Sink variables |
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19 | USE p4zche ! chemical model |
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20 | USE p4zprod ! Growth rate of the 2 phyto groups |
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21 | USE p4zlim ! Nutrient limitation terms |
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22 | USE prtctl_trc ! print control for debugging |
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23 | USE iom ! I/O manager |
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24 | |
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25 | |
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26 | IMPLICIT NONE |
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27 | PRIVATE |
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28 | |
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29 | PUBLIC p4z_rem ! called in p4zbio.F90 |
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30 | PUBLIC p4z_rem_init ! called in trcini_pisces.F90 |
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31 | PUBLIC p4z_rem_alloc ! called in trcini_pisces.F90 |
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32 | |
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33 | !! * Shared module variables |
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34 | REAL(wp), PUBLIC :: xremikc !: remineralisation rate of DOC (p5z) |
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35 | REAL(wp), PUBLIC :: xremikn !: remineralisation rate of DON (p5z) |
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36 | REAL(wp), PUBLIC :: xremikp !: remineralisation rate of DOP (p5z) |
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37 | REAL(wp), PUBLIC :: nitrif !: NH4 nitrification rate |
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38 | REAL(wp), PUBLIC :: xsirem !: remineralisation rate of biogenic silica |
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39 | REAL(wp), PUBLIC :: xsiremlab !: fast remineralisation rate of BSi |
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40 | REAL(wp), PUBLIC :: xsilab !: fraction of labile biogenic silica |
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41 | REAL(wp), PUBLIC :: feratb !: Fe/C quota in bacteria |
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42 | REAL(wp), PUBLIC :: xkferb !: Half-saturation constant for bacterial Fe/C |
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43 | |
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44 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: denitr !: denitrification array |
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45 | |
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46 | !!---------------------------------------------------------------------- |
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47 | !! NEMO/TOP 4.0 , NEMO Consortium (2018) |
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48 | !! $Id$ |
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49 | !! Software governed by the CeCILL license (see ./LICENSE) |
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50 | !!---------------------------------------------------------------------- |
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51 | CONTAINS |
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52 | |
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53 | SUBROUTINE p4z_rem( kt, knt ) |
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54 | !!--------------------------------------------------------------------- |
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55 | !! *** ROUTINE p4z_rem *** |
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56 | !! |
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57 | !! ** Purpose : Compute remineralization/dissolution of organic compounds |
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58 | !! Computes also nitrification of ammonium |
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59 | !! The solubilization/remineralization of POC is treated |
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60 | !! in p4zpoc.F90. The dissolution of calcite is processed |
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61 | !! in p4zlys.F90. |
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62 | !! |
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63 | !! ** Method : - Bacterial biomass is computed implicitely based on a |
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64 | !! parameterization developed from an explicit modeling |
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65 | !! of PISCES in an alternative version |
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66 | !!--------------------------------------------------------------------- |
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67 | INTEGER, INTENT(in) :: kt, knt ! ocean time step |
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68 | ! |
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69 | INTEGER :: ji, jj, jk |
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70 | REAL(wp) :: zremik, zremikc, zremikn, zremikp, zsiremin, zfact |
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71 | REAL(wp) :: zsatur, zsatur2, znusil, znusil2, zdep, zdepmin, zfactdep |
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72 | REAL(wp) :: zbactfer, zonitr |
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73 | REAL(wp) :: zammonic, zoxyremc, zosil, ztem, zdenitnh4, zolimic |
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74 | CHARACTER (len=25) :: charout |
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75 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zdepbac, zolimi, zfacsi, zfacsib, zdepeff, zfebact |
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76 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: zw3d |
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77 | !!--------------------------------------------------------------------- |
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78 | ! |
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79 | IF( ln_timing ) CALL timing_start('p4z_rem') |
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80 | ! |
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81 | ! Initialisation of arrays |
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82 | zdepeff (:,:,:) = 0.3_wp |
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83 | zfacsib(:,:,:) = xsilab / ( 1.0 - xsilab ) |
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84 | zfebact(:,:,:) = 0._wp |
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85 | zfacsi(:,:,:) = xsilab |
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86 | |
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87 | ! Computation of the mean bacterial concentration |
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88 | ! this parameterization has been deduced from a model version |
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89 | ! that was modeling explicitely bacteria. This is a very old param |
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90 | ! that will be very soon updated based on results from a much more |
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91 | ! recent version of PISCES with bacteria. |
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92 | ! ---------------------------------------------------------------- |
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93 | DO jk = 1, jpkm1 |
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94 | DO jj = 1, jpj |
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95 | DO ji = 1, jpi |
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96 | zdep = MAX( hmld(ji,jj), heup_01(ji,jj) ) |
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97 | zdepbac(ji,jj,jk) = 0.6 * ( MAX(0.0, trb(ji,jj,jk,jpzoo) + trb(ji,jj,jk,jpmes) ) * 1.0E6 )**0.6 * 1.E-6 |
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98 | IF( gdept_n(ji,jj,jk) >= zdep ) THEN |
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99 | zdepmin = MIN( 1., zdep / gdept_n(ji,jj,jk) ) |
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100 | zdepeff (ji,jj,jk) = zdepeff(ji,jj,jk) * zdepmin**0.3 |
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101 | ENDIF |
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102 | END DO |
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103 | END DO |
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104 | END DO |
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105 | |
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106 | DO jk = 1, jpkm1 |
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107 | DO jj = 1, jpj |
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108 | DO ji = 1, jpi |
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109 | ! DOC ammonification. Depends on a limitation term of the bacterial activity |
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110 | ! and on the implicit bacteria concentration |
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111 | ! -------------------------------------------------------------------------- |
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112 | zremik = xstep / 1.e-6 * xlimbac(ji,jj,jk) * zdepbac(ji,jj,jk) |
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113 | zremik = MAX( zremik, 2.74e-4 * xstep / xremikc ) |
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114 | zremikc = xremikc * zremik |
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115 | |
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116 | ! Ammonification in oxic waters with oxygen consumption |
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117 | ! ----------------------------------------------------- |
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118 | zolimic = zremikc * ( 1.- nitrfac(ji,jj,jk) ) * trb(ji,jj,jk,jpdoc) |
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119 | zolimic = MAX( 0.e0, MIN( ( trb(ji,jj,jk,jpoxy) - rtrn ) / o2ut, zolimic ) ) |
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120 | zolimi(ji,jj,jk) = zolimic |
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121 | |
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122 | ! Ammonification in suboxic waters with denitrification |
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123 | ! ----------------------------------------------------- |
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124 | zammonic = zremikc * nitrfac(ji,jj,jk) * trb(ji,jj,jk,jpdoc) |
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125 | denitr(ji,jj,jk) = zammonic * ( 1. - nitrfac2(ji,jj,jk) ) |
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126 | denitr(ji,jj,jk) = MAX(0., MIN( ( trb(ji,jj,jk,jpno3) - rtrn ) / rdenit, denitr(ji,jj,jk) ) ) |
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127 | |
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128 | ! Ammonification in waters depleted in O2 and NO3 based on |
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129 | ! other redox processes |
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130 | ! -------------------------------------------------------- |
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131 | zoxyremc = MAX(0., zammonic - denitr(ji,jj,jk) ) |
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132 | |
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133 | ! Update of the TRA arrays |
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134 | tra(ji,jj,jk,jpno3) = tra(ji,jj,jk,jpno3) - denitr(ji,jj,jk) * rdenit |
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135 | tra(ji,jj,jk,jpdoc) = tra(ji,jj,jk,jpdoc) - ( zolimic + denitr(ji,jj,jk) + zoxyremc ) |
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136 | tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) - zolimic * o2ut |
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137 | tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + zolimic + denitr(ji,jj,jk) + zoxyremc |
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138 | IF ( ln_p4z ) THEN ! PISCES-std |
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139 | tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + zolimic + denitr(ji,jj,jk) + zoxyremc |
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140 | tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zolimic + denitr(ji,jj,jk) + zoxyremc |
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141 | tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * ( zolimic + zoxyremc + ( rdenit + 1.) * denitr(ji,jj,jk) ) |
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142 | ELSE ! PISCES-QUOTA (p5z) |
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143 | zremikn = xremikn / xremikc * trb(ji,jj,jk,jpdon) / ( trb(ji,jj,jk,jpdoc) + rtrn ) |
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144 | zremikp = xremikp / xremikc * trb(ji,jj,jk,jpdop) / ( trb(ji,jj,jk,jpdoc) + rtrn ) |
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145 | tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + zremikp * ( zolimic + denitr(ji,jj,jk) + zoxyremc ) |
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146 | tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zremikn * ( zolimic + denitr(ji,jj,jk) + zoxyremc ) |
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147 | tra(ji,jj,jk,jpdon) = tra(ji,jj,jk,jpdon) - zremikn * ( zolimic + denitr(ji,jj,jk) + zoxyremc ) |
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148 | tra(ji,jj,jk,jpdop) = tra(ji,jj,jk,jpdop) - zremikp * ( zolimic + denitr(ji,jj,jk) + zoxyremc ) |
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149 | tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * zremikn * ( zolimic + zoxyremc + ( rdenit + 1.) * denitr(ji,jj,jk) ) |
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150 | ENDIF |
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151 | END DO |
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152 | END DO |
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153 | END DO |
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154 | |
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155 | DO jk = 1, jpkm1 |
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156 | DO jj = 1, jpj |
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157 | DO ji = 1, jpi |
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158 | ! NH4 nitrification to NO3. Ceased for oxygen concentrations |
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159 | ! below 2 umol/L. Inhibited at strong light |
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160 | ! ---------------------------------------------------------- |
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161 | zonitr = nitrif * xstep * trb(ji,jj,jk,jpnh4) * ( 1.- nitrfac(ji,jj,jk) ) & |
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162 | & / ( 1.+ emoy(ji,jj,jk) ) * ( 1. + fr_i(ji,jj) * emoy(ji,jj,jk) ) |
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163 | zdenitnh4 = nitrif * xstep * trb(ji,jj,jk,jpnh4) * nitrfac(ji,jj,jk) |
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164 | zdenitnh4 = MAX(0., MIN( ( trb(ji,jj,jk,jpno3) - rtrn ) / rdenita, zdenitnh4 ) ) |
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165 | ! Update of the tracers trends |
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166 | ! ---------------------------- |
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167 | tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) - zonitr - zdenitnh4 |
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168 | tra(ji,jj,jk,jpno3) = tra(ji,jj,jk,jpno3) + zonitr - rdenita * zdenitnh4 |
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169 | tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) - o2nit * zonitr |
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170 | tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) - 2. * rno3 * zonitr + rno3 * ( rdenita - 1. ) * zdenitnh4 |
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171 | END DO |
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172 | END DO |
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173 | END DO |
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174 | |
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175 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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176 | WRITE(charout, FMT="('rem1')") |
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177 | CALL prt_ctl_trc_info(charout) |
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178 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) |
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179 | ENDIF |
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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 | ! Bacterial uptake of iron. No iron is available in DOC. So |
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186 | ! Bacteria are obliged to take up iron from the water. Some |
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187 | ! studies (especially at Papa) have shown this uptake to be significant |
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188 | ! --------------------------------------------------------------------- |
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189 | zbactfer = feratb * 0.6_wp * xstep * tgfunc(ji,jj,jk) * xlimbacl(ji,jj,jk) * trb(ji,jj,jk,jpfer) & |
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190 | & / ( xkferb + trb(ji,jj,jk,jpfer) ) * zdepeff(ji,jj,jk) * zdepbac(ji,jj,jk) |
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191 | |
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192 | ! Only the transfer of iron from its dissolved form to particles |
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193 | ! is treated here. The GGE of bacteria supposed to be equal to |
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194 | ! 0.33. This is hard-coded. |
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195 | tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) - zbactfer*0.18 |
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196 | tra(ji,jj,jk,jpsfe) = tra(ji,jj,jk,jpsfe) + zbactfer*0.15 |
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197 | tra(ji,jj,jk,jpbfe) = tra(ji,jj,jk,jpbfe) + zbactfer*0.03 |
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198 | zfebact(ji,jj,jk) = zbactfer * 0.18 |
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199 | blim(ji,jj,jk) = xlimbacl(ji,jj,jk) * zdepbac(ji,jj,jk) / 1.e-6 |
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200 | END DO |
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201 | END DO |
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202 | END DO |
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203 | |
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204 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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205 | WRITE(charout, FMT="('rem2')") |
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206 | CALL prt_ctl_trc_info(charout) |
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207 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) |
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208 | ENDIF |
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209 | |
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210 | ! Initialization of the array which contains the labile fraction |
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211 | ! of bSi. Set to a constant in the upper ocean |
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212 | ! --------------------------------------------------------------- |
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213 | DO jk = 1, jpkm1 |
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214 | DO jj = 1, jpj |
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215 | DO ji = 1, jpi |
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216 | |
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217 | ! Remineralization rate of BSi dependent on T and saturation |
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218 | ! The parameterization is taken from Ridgwell et al. (2002) |
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219 | ! --------------------------------------------------------- |
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220 | zdep = MAX( hmld(ji,jj), heup_01(ji,jj) ) |
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221 | zsatur = MAX( rtrn, ( sio3eq(ji,jj,jk) - trb(ji,jj,jk,jpsil) ) / ( sio3eq(ji,jj,jk) + rtrn ) ) |
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222 | zsatur2 = ( 1. + tsn(ji,jj,jk,jp_tem) / 400.)**37 |
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223 | znusil = 0.225 * ( 1. + tsn(ji,jj,jk,jp_tem) / 15.) * zsatur + 0.775 * zsatur2 * zsatur**9.25 |
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224 | |
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225 | ! Two fractions of bSi are considered : a labile one and a more |
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226 | ! refractory one based on the commonly observed two step |
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227 | ! dissolution of bSi (initial rapid dissolution followed by |
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228 | ! more slowly dissolution). |
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229 | ! Computation of the vertical evolution of the labile fraction |
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230 | ! of bSi. This is computed assuming steady state. |
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231 | ! -------------------------------------------------------------- |
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232 | IF ( gdept_n(ji,jj,jk) > zdep ) THEN |
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233 | zfacsib(ji,jj,jk) = zfacsib(ji,jj,jk-1) * EXP( -0.5 * ( xsiremlab - xsirem ) & |
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234 | & * znusil * e3t_n(ji,jj,jk) / wsbio4(ji,jj,jk) ) |
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235 | zfacsi(ji,jj,jk) = zfacsib(ji,jj,jk) / ( 1.0 + zfacsib(ji,jj,jk) ) |
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236 | zfacsib(ji,jj,jk) = zfacsib(ji,jj,jk) * EXP( -0.5 * ( xsiremlab - xsirem ) & |
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237 | & * znusil * e3t_n(ji,jj,jk) / wsbio4(ji,jj,jk) ) |
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238 | ENDIF |
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239 | zsiremin = ( xsiremlab * zfacsi(ji,jj,jk) + xsirem * ( 1. - zfacsi(ji,jj,jk) ) ) * xstep * znusil |
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240 | zosil = zsiremin * trb(ji,jj,jk,jpgsi) |
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241 | |
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242 | ! Update of the TRA arrays |
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243 | tra(ji,jj,jk,jpgsi) = tra(ji,jj,jk,jpgsi) - zosil |
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244 | tra(ji,jj,jk,jpsil) = tra(ji,jj,jk,jpsil) + zosil |
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245 | END DO |
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246 | END DO |
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247 | END DO |
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248 | |
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249 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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250 | WRITE(charout, FMT="('rem3')") |
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251 | CALL prt_ctl_trc_info(charout) |
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252 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) |
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253 | ENDIF |
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254 | |
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255 | IF( knt == nrdttrc ) THEN |
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256 | ALLOCATE( zw3d(jpi,jpj,jpk) ) |
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257 | zfact = 1.e+3 * rfact2r ! conversion from mol/l/kt to mol/m3/s |
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258 | ! |
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259 | IF( iom_use( "REMIN" ) ) THEN |
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260 | zw3d(:,:,:) = zolimi(:,:,:) * tmask(:,:,:) * zfact ! Remineralisation rate |
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261 | CALL iom_put( "REMIN" , zw3d ) |
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262 | ENDIF |
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263 | IF( iom_use( "DENIT" ) ) THEN |
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264 | zw3d(:,:,:) = denitr(:,:,:) * rdenit * rno3 * tmask(:,:,:) * zfact ! Denitrification |
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265 | CALL iom_put( "DENIT" , zw3d ) |
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266 | ENDIF |
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267 | IF( iom_use( "BACT" ) ) THEN |
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268 | zw3d(:,:,:) = zdepbac(:,:,:) * 1.E6 * tmask(:,:,:) ! Bacterial biomass |
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269 | CALL iom_put( "BACT", zw3d ) |
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270 | ENDIF |
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271 | IF( iom_use( "FEBACT" ) ) THEN |
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272 | zw3d(:,:,:) = zfebact(:,:,:) * 1E9 * tmask(:,:,:) * zfact ! Bacterial iron consumption |
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273 | CALL iom_put( "FEBACT" , zw3d ) |
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274 | ENDIF |
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275 | ! |
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276 | DEALLOCATE( zw3d ) |
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277 | ENDIF |
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278 | ! |
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279 | IF( ln_timing ) CALL timing_stop('p4z_rem') |
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280 | ! |
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281 | END SUBROUTINE p4z_rem |
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282 | |
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283 | |
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284 | SUBROUTINE p4z_rem_init |
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285 | !!---------------------------------------------------------------------- |
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286 | !! *** ROUTINE p4z_rem_init *** |
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287 | !! |
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288 | !! ** Purpose : Initialization of remineralization parameters |
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289 | !! |
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290 | !! ** Method : Read the nampisrem namelist and check the parameters |
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291 | !! called at the first timestep |
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292 | !! |
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293 | !! ** input : Namelist nampisrem |
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294 | !! |
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295 | !!---------------------------------------------------------------------- |
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296 | NAMELIST/nampisrem/ nitrif, xsirem, xsiremlab, xsilab, feratb, xkferb, & |
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297 | & xremikc, xremikn, xremikp |
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298 | INTEGER :: ios ! Local integer output status for namelist read |
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299 | !!---------------------------------------------------------------------- |
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300 | ! |
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301 | IF(lwp) THEN |
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302 | WRITE(numout,*) |
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303 | WRITE(numout,*) 'p4z_rem_init : Initialization of remineralization parameters' |
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304 | WRITE(numout,*) '~~~~~~~~~~~~' |
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305 | ENDIF |
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306 | ! |
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307 | REWIND( numnatp_ref ) ! Namelist nampisrem in reference namelist : Pisces remineralization |
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308 | READ ( numnatp_ref, nampisrem, IOSTAT = ios, ERR = 901) |
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309 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nampisrem in reference namelist' ) |
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310 | REWIND( numnatp_cfg ) ! Namelist nampisrem in configuration namelist : Pisces remineralization |
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311 | READ ( numnatp_cfg, nampisrem, IOSTAT = ios, ERR = 902 ) |
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312 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'nampisrem in configuration namelist' ) |
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313 | IF(lwm) WRITE( numonp, nampisrem ) |
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314 | |
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315 | IF(lwp) THEN ! control print |
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316 | WRITE(numout,*) ' Namelist parameters for remineralization, nampisrem' |
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317 | IF( ln_p4z ) THEN |
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318 | WRITE(numout,*) ' remineralization rate of DOC xremikc =', xremikc |
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319 | ELSE |
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320 | WRITE(numout,*) ' remineralization rate of DOC xremikc =', xremikc |
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321 | WRITE(numout,*) ' remineralization rate of DON xremikn =', xremikn |
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322 | WRITE(numout,*) ' remineralization rate of DOP xremikp =', xremikp |
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323 | ENDIF |
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324 | WRITE(numout,*) ' remineralization rate of Si xsirem =', xsirem |
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325 | WRITE(numout,*) ' fast remineralization rate of Si xsiremlab =', xsiremlab |
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326 | WRITE(numout,*) ' fraction of labile biogenic silica xsilab =', xsilab |
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327 | WRITE(numout,*) ' NH4 nitrification rate nitrif =', nitrif |
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328 | WRITE(numout,*) ' Bacterial Fe/C ratio feratb =', feratb |
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329 | WRITE(numout,*) ' Half-saturation constant for bact. Fe/C xkferb =', xkferb |
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330 | ENDIF |
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331 | ! |
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332 | denitr(:,:,:) = 0._wp |
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333 | ! |
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334 | END SUBROUTINE p4z_rem_init |
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335 | |
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336 | |
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337 | INTEGER FUNCTION p4z_rem_alloc() |
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338 | !!---------------------------------------------------------------------- |
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339 | !! *** ROUTINE p4z_rem_alloc *** |
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340 | !!---------------------------------------------------------------------- |
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341 | ALLOCATE( denitr(jpi,jpj,jpk), STAT=p4z_rem_alloc ) |
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342 | ! |
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343 | IF( p4z_rem_alloc /= 0 ) CALL ctl_stop( 'STOP', 'p4z_rem_alloc: failed to allocate arrays' ) |
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344 | ! |
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345 | END FUNCTION p4z_rem_alloc |
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346 | |
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347 | !!====================================================================== |
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348 | END MODULE p4zrem |
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