1 | MODULE soil_thermalproperties_mod |
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2 | |
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3 | implicit none |
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4 | |
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5 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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6 | !!! |
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7 | !!! Purpose: Compute the soil thermal properties |
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8 | !!! Author: LL, 04/2023 |
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9 | !!! |
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10 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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11 | |
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12 | ! Constants: |
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13 | real, parameter :: reg_inertie_thresold = 370. ! Above this thermal inertia, the regolith has too much cementation to be dependant on the pressure [J/m^2/K/s^1/2] |
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14 | real, parameter :: reg_inertie_minvalue = 50. ! Minimum value of the Thermal Inertia at low pressure (Piqueux & Christensen 2009) [J/m^2/K/s^1/2] |
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15 | real, parameter :: reg_inertie_maxvalue = 370. ! Maximum value of the Thermal Inertia at low pressure (Piqueux & Christensen 2009) [J/m^2/K/s^1/2] |
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16 | real, parameter :: P610 = 610.0 ! current average pressure on Mars [Pa] |
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17 | real, parameter :: C = 0.0015 ! Constant to derive TI as a function of P, from Presley and Christensen 1997 [unitless] |
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18 | real, parameter :: K = 8.1*1e4 ! Constant to derive TI as a function of P, from Presley and Christensen 1997 [Torr, or 133.3Pa] |
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19 | real, parameter :: Pa2Torr = 1./133.3 ! Conversion from Pa to tor [Pa/Torr] |
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20 | |
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21 | !======================================================================= |
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22 | contains |
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23 | !======================================================================= |
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24 | |
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25 | SUBROUTINE ice_thermal_properties(ispureice,pore_filling,surf_thermalinertia,ice_thermalinertia) |
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26 | !======================================================================= |
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27 | ! subject: Compute ice thermal properties |
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28 | ! -------- |
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29 | ! |
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30 | ! author: LL, 04/2023 |
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31 | ! ------- |
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32 | ! |
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33 | !======================================================================= |
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34 | |
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35 | use constants_marspem_mod, only: porosity |
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36 | |
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37 | implicit none |
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38 | |
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39 | !----------------------------------------------------------------------- |
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40 | !======================================================================= |
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41 | ! Declarations : |
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42 | !======================================================================= |
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43 | ! |
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44 | ! Input/Output |
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45 | ! ------------ |
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46 | logical, intent(in) :: ispureice ! Boolean to check if ice is massive or just pore filling |
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47 | real, intent(in) :: pore_filling ! ice pore filling in each layer (1) |
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48 | real, intent(in) :: surf_thermalinertia ! surface thermal inertia (J/m^2/K/s^1/2) |
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49 | real, intent(out) :: ice_thermalinertia ! Thermal inertia of ice when present in the pore (J/m^2/K/s^1/2) |
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50 | |
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51 | ! Local Variables |
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52 | ! -------------- |
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53 | REAL :: inertie_purewaterice = 2100 ! 2050 is better according to my computations with the formula from Siegler et al., 2012, but let's follow Mellon et al. (2004) |
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54 | !======================================================================= |
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55 | ! Beginning of the code |
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56 | !======================================================================= |
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57 | |
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58 | if (ispureice) then |
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59 | ice_thermalinertia = inertie_purewaterice |
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60 | else |
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61 | ice_thermalinertia = sqrt(surf_thermalinertia**2 + porosity*pore_filling*inertie_purewaterice**2) ! Siegler et al., 2012 |
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62 | endif |
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63 | |
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64 | END SUBROUTINE |
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65 | !======================================================================= |
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66 | |
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67 | SUBROUTINE update_soil_thermalproperties(ngrid,nslope,nsoil,tendencies_waterice,waterice,p_avg_new,icetable_depth,icetable_thickness,ice_porefilling,icetable_equilibrium,icetable_dynamic,TI_PEM) |
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68 | |
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69 | use comsoil_h, only: volcapa |
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70 | use comsoil_h_PEM, only: layer_PEM, inertiedat_PEM, depth_breccia, depth_bedrock, index_breccia, index_bedrock, reg_thprop_dependp |
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71 | use constants_marspem_mod, only: TI_breccia, TI_bedrock, TI_regolith_avg |
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72 | |
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73 | implicit none |
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74 | |
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75 | ! Input: |
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76 | integer, intent(in) :: ngrid, nslope, nsoil ! Shape of the arrays: physical grid, number of sub-grid slopes, number of layer in the soil |
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77 | real, intent(in) :: p_avg_new ! Global average surface pressure [Pa] |
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78 | real, dimension(ngrid,nslope), intent(in) :: tendencies_waterice ! Tendencies on the water ice [kg/m^2/year] |
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79 | real, dimension(ngrid,nslope), intent(in) :: waterice ! Surface Water ice [kg/m^2] |
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80 | real, dimension(ngrid,nslope), intent(in) :: icetable_depth ! Ice table depth [m] |
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81 | real, dimension(ngrid,nslope), intent(in) :: icetable_thickness ! Ice table thickness [m] |
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82 | real, dimension(ngrid,nsoil,nslope), intent(in) :: ice_porefilling ! Ice porefilling [m^3/m^3] |
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83 | logical, intent(in) :: icetable_equilibrium, icetable_dynamic ! Computing method for ice table |
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84 | |
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85 | ! Outputs: |
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86 | real, dimension(ngrid,nsoil,nslope), intent(inout) :: TI_PEM ! Soil Thermal Inertia [J/m^2/K/s^1/2] |
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87 | |
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88 | ! Local variables: |
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89 | integer :: ig, islope, isoil, iref, iend ! Loop variables |
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90 | real, dimension(ngrid,nslope) :: regolith_inertia ! Thermal inertia of the regolith (first layer in the GCM) [J/m^2/K/s^1/2] |
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91 | real :: delta ! Difference of depth to compute the thermal inertia in a mixed layer [m] |
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92 | real :: ice_bottom_depth ! Bottom depth of the subsurface ice [m] |
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93 | real :: d_part ! Regolith particle size [micrometer] |
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94 | real :: ice_inertia ! Inertia of water ice [SI] |
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95 | |
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96 | write(*,*) "Update soil properties" |
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97 | |
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98 | ! 1. Modification of the regolith thermal inertia. |
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99 | do islope = 1,nslope |
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100 | regolith_inertia(:,islope) = inertiedat_PEM(:,1) |
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101 | do ig = 1,ngrid |
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102 | if (tendencies_waterice(ig,islope) < -1.e-5 .and. waterice(ig,islope) == 0) regolith_inertia(ig,islope) = TI_regolith_avg |
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103 | if (reg_thprop_dependp) then |
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104 | if (TI_PEM(ig,1,islope) < reg_inertie_thresold) then |
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105 | d_part = (regolith_inertia(ig,islope)**2/(volcapa*C*(P610*Pa2Torr)**(0.6)))**(-1./(0.11*log10(P610*Pa2Torr/K))) ! compute particle size, in micrometer |
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106 | regolith_inertia(ig,islope) = sqrt(volcapa*C*(p_avg_new*Pa2Torr)**(0.6)*d_part**(-0.11*log10(p_avg_new*Pa2Torr/K))) |
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107 | if (regolith_inertia(ig,islope) > reg_inertie_maxvalue) regolith_inertia(ig,islope) = reg_inertie_maxvalue |
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108 | if (regolith_inertia(ig,islope) < reg_inertie_minvalue) regolith_inertia(ig,islope) = reg_inertie_minvalue |
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109 | endif |
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110 | endif |
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111 | enddo |
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112 | enddo |
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113 | |
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114 | ! 2. Build new Thermal Inertia |
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115 | do islope = 1,nslope |
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116 | do ig = 1,ngrid |
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117 | do isoil = 1,index_breccia |
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118 | TI_PEM(ig,isoil,islope) = regolith_inertia(ig,islope) |
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119 | enddo |
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120 | if (regolith_inertia(ig,islope) < TI_breccia) then |
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121 | !!! transition |
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122 | delta = depth_breccia |
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123 | TI_PEM(ig,index_breccia + 1,islope) = sqrt((layer_PEM(index_breccia + 1) - layer_PEM(index_breccia))/ & |
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124 | (((delta - layer_PEM(index_breccia))/(TI_PEM(ig,index_breccia,islope)**2)) + & |
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125 | ((layer_PEM(index_breccia + 1) - delta)/(TI_breccia**2)))) |
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126 | do isoil = index_breccia + 2,index_bedrock |
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127 | TI_PEM(ig,isoil,islope) = TI_breccia |
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128 | enddo |
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129 | else ! we keep the high ti values |
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130 | do isoil = index_breccia + 1,index_bedrock |
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131 | TI_PEM(ig,isoil,islope) = TI_PEM(ig,index_breccia,islope) |
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132 | enddo |
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133 | endif ! TI PEM and breccia comparison |
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134 | !!! transition |
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135 | delta = depth_bedrock |
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136 | TI_PEM(ig,index_bedrock + 1,islope) = sqrt((layer_PEM(index_bedrock + 1) - layer_PEM(index_bedrock))/ & |
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137 | (((delta - layer_PEM(index_bedrock))/(TI_PEM(ig,index_bedrock,islope)**2)) + & |
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138 | ((layer_PEM(index_bedrock + 1) - delta)/(TI_bedrock**2)))) |
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139 | do isoil = index_bedrock + 2,nsoil |
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140 | TI_PEM(ig,isoil,islope) = TI_bedrock |
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141 | enddo |
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142 | enddo ! ig |
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143 | enddo ! islope |
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144 | |
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145 | ! 3. Build new TI in case of ice table |
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146 | do ig = 1,ngrid |
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147 | do islope = 1,nslope |
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148 | if (icetable_depth(ig,islope) > -1.e-6) then |
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149 | ! 3.0 Case where it is perennial ice |
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150 | if (icetable_depth(ig,islope) < 1.e-10) then |
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151 | call ice_thermal_properties(.true.,1.,0.,ice_inertia) |
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152 | do isoil = 1,nsoil |
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153 | TI_PEM(ig,isoil,islope) = ice_inertia |
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154 | enddo |
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155 | else |
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156 | if (icetable_equilibrium) then |
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157 | call ice_thermal_properties(.false.,1.,regolith_inertia(ig,islope),ice_inertia) |
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158 | ! 3.1.1 find the index of the mixed layer |
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159 | iref = 0 ! initialize iref |
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160 | do isoil = 1,nsoil ! loop on layers to find the beginning of the ice table |
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161 | if (icetable_depth(ig,islope) >= layer_PEM(isoil)) then |
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162 | iref = isoil ! pure regolith layer up to here |
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163 | else |
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164 | exit ! correct iref was obtained in previous cycle |
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165 | endif |
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166 | enddo |
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167 | ! 3.1.2 find the index of the end of the ice table |
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168 | iend = 0 ! initialize iend |
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169 | ice_bottom_depth = icetable_depth(ig,islope) + icetable_thickness(ig,islope) |
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170 | do isoil = 1,nsoil ! loop on layers to find the end of the ice table |
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171 | if (ice_bottom_depth >= layer_PEM(isoil)) then |
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172 | iend = isoil ! pure regolith layer up to here |
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173 | else |
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174 | exit ! correct iref was obtained in previous cycle |
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175 | endif |
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176 | enddo |
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177 | ! 3.2 Build the new ti |
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178 | if (iref < nsoil) then |
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179 | if (iref == iend) then |
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180 | ! Ice table begins and end in the same mixture with three components |
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181 | if (iref /= 0) then ! mixed layer |
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182 | TI_PEM(ig,iref + 1,islope) = sqrt((layer_PEM(iref + 1) - layer_PEM(iref))/ & |
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183 | (((icetable_depth(ig,islope) - layer_PEM(iref))/(TI_PEM(ig,iref,islope)**2)) + & |
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184 | ((ice_bottom_depth - icetable_depth(ig,islope))/(ice_inertia**2)) + & |
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185 | ((layer_PEM(iref + 1) - ice_bottom_depth)/(TI_PEM(ig,iref + 1,islope)**2)))) |
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186 | else ! first layer is already a mixed layer |
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187 | ! (ie: take layer(iref=0)=0) |
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188 | TI_PEM(ig,1,islope) = sqrt((layer_PEM(1))/ & |
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189 | (((icetable_depth(ig,islope))/(TI_PEM(ig,1,islope)**2)) + & |
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190 | ((ice_bottom_depth - icetable_depth(ig,islope))/(ice_inertia**2)) + & |
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191 | ((layer_PEM(2) - ice_bottom_depth)/(TI_PEM(ig,2,islope)**2)))) |
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192 | endif ! of if (iref /= 0) |
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193 | else |
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194 | if (iref /= 0) then ! mixed layer |
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195 | TI_PEM(ig,iref + 1,islope) = sqrt((layer_PEM(iref + 1) - layer_PEM(iref))/ & |
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196 | (((icetable_depth(ig,islope) - layer_PEM(iref))/(TI_PEM(ig,iref,islope)**2)) + & |
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197 | ((layer_PEM(iref + 1) - icetable_depth(ig,islope))/(ice_inertia**2)))) |
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198 | else ! first layer is already a mixed layer |
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199 | ! (ie: take layer(iref=0)=0) |
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200 | TI_PEM(ig,1,islope) = sqrt((layer_PEM(1))/ & |
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201 | (((icetable_depth(ig,islope))/(TI_PEM(ig,1,islope)**2)) + & |
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202 | ((layer_PEM(1) - icetable_depth(ig,islope))/(ice_inertia**2)))) |
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203 | endif ! of if (iref /= 0) |
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204 | endif ! iref == iend |
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205 | |
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206 | TI_PEM(ig,iref + 2:iend,islope) = ice_inertia |
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207 | if (iend < nsoil) then |
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208 | TI_PEM(ig,iend + 1,islope) = sqrt((layer_PEM(iend + 1) - layer_PEM(iend))/ & |
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209 | (((ice_bottom_depth - layer_PEM(iend))/(TI_PEM(ig,iend,islope)**2)) + & |
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210 | ((layer_PEM(iend + 1) - ice_bottom_depth)/(ice_inertia**2)))) |
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211 | endif |
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212 | endif ! of if (iref < nsoilmx) |
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213 | else if (icetable_dynamic) then |
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214 | do isoil = 1,nsoil |
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215 | call ice_thermal_properties(.false.,ice_porefilling(ig,isoil,islope),regolith_inertia(ig,islope),TI_PEM(ig,isoil,islope)) |
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216 | enddo |
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217 | endif ! of if icetable_equilibrium |
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218 | endif ! permanent glaciers |
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219 | endif ! icetable_depth(ig,islope) > 0. |
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220 | enddo !islope |
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221 | enddo !ig |
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222 | |
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223 | END SUBROUTINE update_soil_thermalproperties |
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224 | |
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225 | END MODULE soil_thermalproperties_mod |
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