1 | SUBROUTINE init_cloud_physics |
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2 | |
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3 | !--------------------------------------------------------------------------------! |
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4 | ! This file is part of PALM. |
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5 | ! |
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6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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8 | ! either version 3 of the License, or (at your option) any later version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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18 | !--------------------------------------------------------------------------------! |
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19 | ! |
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20 | ! Current revisions: |
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21 | ! ----------------- |
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22 | ! sed_qc_const is now calculated here (2-moment microphysics) |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ------------------ |
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26 | ! $Id: init_cloud_physics.f90 1361 2014-04-16 15:17:48Z hoffmann $ |
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27 | ! |
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28 | ! 1353 2014-04-08 15:21:23Z heinze |
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29 | ! REAL constants provided with KIND-attribute |
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30 | ! |
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31 | ! 1334 2014-03-25 12:21:40Z heinze |
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32 | ! Bugfix: REAL constants provided with KIND-attribute |
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33 | ! |
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34 | ! 1322 2014-03-20 16:38:49Z raasch |
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35 | ! REAL constants defined as wp-kind |
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36 | ! |
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37 | ! 1320 2014-03-20 08:40:49Z raasch |
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38 | ! ONLY-attribute added to USE-statements, |
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39 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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40 | ! kinds are defined in new module mod_kinds, |
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41 | ! revision history before 2012 removed, |
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42 | ! comment fields (!:) to be used for variable explanations added to |
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43 | ! all variable declaration statements |
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44 | ! |
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45 | ! 1065 2012-11-22 17:42:36Z hoffmann |
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46 | ! The Courant number of sedimentation can be controlled with c_sedimentation. |
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47 | ! |
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48 | ! 1053 2012-11-13 17:11:03Z hoffmann |
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49 | ! calculation of the maximum timestep according to the terminal velocity of rain |
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50 | ! drops in the two moment cloud scheme |
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51 | ! |
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52 | ! calculation of frequently used constants (pirho_l, dpirho_l, schmidt_p_1d3, |
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53 | ! hyrho) |
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54 | ! |
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55 | ! 1036 2012-10-22 13:43:42Z raasch |
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56 | ! code put under GPL (PALM 3.9) |
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57 | ! |
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58 | ! 824 2012-02-17 09:09:57Z raasch |
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59 | ! calculation of b_cond replaced by calculation of bfactor |
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60 | ! |
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61 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
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62 | ! Initial revision |
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63 | ! |
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64 | ! |
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65 | ! Description: |
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66 | ! ------------ |
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67 | ! Initialization of parameters for handling cloud-physics |
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68 | !------------------------------------------------------------------------------! |
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69 | |
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70 | USE arrays_3d, & |
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71 | ONLY: dzu, hyp, pt_init, zu |
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72 | |
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73 | USE cloud_parameters, & |
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74 | ONLY: bfactor, cp, c_sedimentation, dpirho_l, dt_precipitation, & |
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75 | hyrho, k_st, l_d_cp, l_d_r, l_d_rv, l_v, mass_of_solute, & |
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76 | molecular_weight_of_solute, molecular_weight_of_water, pirho_l, & |
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77 | pt_d_t, rho_l, r_d, r_v, sed_qc_const, schmidt, schmidt_p_1d3, & |
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78 | sigma_gc, t_d_pt, vanthoff, w_precipitation |
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79 | |
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80 | USE constants, & |
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81 | ONLY: pi |
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82 | |
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83 | USE control_parameters, & |
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84 | ONLY: g, icloud_scheme, message_string, precipitation, pt_surface, & |
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85 | rho_surface, surface_pressure |
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86 | |
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87 | USE indices, & |
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88 | ONLY: nzb, nzt |
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89 | |
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90 | USE kinds |
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91 | |
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92 | IMPLICIT NONE |
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93 | |
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94 | INTEGER(iwp) :: k !: |
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95 | |
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96 | REAL(wp) :: t_surface !: |
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97 | |
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98 | ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1), & |
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99 | hyrho(nzb:nzt+1) ) |
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100 | |
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101 | ! |
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102 | !-- Calculate frequently used parameters |
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103 | l_d_cp = l_v / cp |
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104 | l_d_r = l_v / r_d |
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105 | l_d_rv = l_v / r_v |
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106 | |
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107 | schmidt_p_1d3 = schmidt**( 1.0_wp / 3.0_wp ) |
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108 | |
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109 | pirho_l = pi * rho_l / 6.0_wp |
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110 | dpirho_l = 1.0_wp / pirho_l |
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111 | ! |
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112 | !-- constant fot the sedimentation of cloud water (2-moment cloud physics) |
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113 | sed_qc_const = k_st * ( 3.0_wp / ( 4.0_wp * pi * rho_l ) & |
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114 | )**( 2.0_wp / 3.0_wp ) * & |
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115 | EXP( 5.0_wp * LOG( sigma_gc )**2 ) |
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116 | ! |
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117 | !-- Calculate timestep according to precipitation |
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118 | IF ( icloud_scheme == 0 .AND. precipitation ) THEN |
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119 | dt_precipitation = c_sedimentation * MINVAL( dzu(nzb+2:nzt) ) / & |
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120 | w_precipitation |
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121 | ENDIF |
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122 | ! |
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123 | !-- Calculate factor used in equation for droplet growth by condensation |
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124 | bfactor = 3.0_wp * vanthoff * mass_of_solute * molecular_weight_of_water & |
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125 | / ( 4.0_wp * pi * rho_l * molecular_weight_of_solute ) |
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126 | ! |
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127 | !-- Calculate: |
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128 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
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129 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
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130 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) |
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131 | t_surface = pt_surface * ( surface_pressure / 1000.0_wp )**0.286_wp |
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132 | DO k = nzb, nzt+1 |
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133 | ! |
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134 | !-- Check temperature in case of too large domain height |
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135 | IF ( ( t_surface - g/cp * zu(k) ) < 0.0_wp ) THEN |
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136 | WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & |
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137 | ') = ', zu(k) |
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138 | CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) |
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139 | ENDIF |
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140 | hyp(k) = surface_pressure * 100.0_wp * & |
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141 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0_wp/0.286_wp) |
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142 | pt_d_t(k) = ( 100000.0_wp / hyp(k) )**0.286_wp |
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143 | t_d_pt(k) = 1.0_wp / pt_d_t(k) |
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144 | hyrho(k) = hyp(k) / ( r_d * t_d_pt(k) * pt_init(k) ) |
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145 | ENDDO |
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146 | |
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147 | ! |
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148 | !-- Compute reference density |
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149 | rho_surface = surface_pressure * 100.0_wp / ( r_d * t_surface ) |
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150 | |
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151 | |
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152 | END SUBROUTINE init_cloud_physics |
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