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 1997-2012 Leibniz University 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 | ! |
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23 | ! Former revisions: |
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24 | ! ------------------ |
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25 | ! $Id: init_cloud_physics.f90 1066 2012-11-22 17:52:43Z witha $ |
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26 | ! |
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27 | ! 1065 2012-11-22 17:42:36Z hoffmann |
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28 | ! The Courant number of sedimentation can be controlled with c_sedimentation. |
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29 | ! |
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30 | ! 1053 2012-11-13 17:11:03Z hoffmann |
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31 | ! calculation of the maximum timestep according to the terminal velocity of rain |
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32 | ! drops in the two moment cloud scheme |
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33 | ! |
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34 | ! calculation of frequently used constants (pirho_l, dpirho_l, schmidt_p_1d3, |
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35 | ! hyrho) |
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36 | ! |
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37 | ! 1036 2012-10-22 13:43:42Z raasch |
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38 | ! code put under GPL (PALM 3.9) |
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39 | ! |
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40 | ! 824 2012-02-17 09:09:57Z raasch |
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41 | ! calculation of b_cond replaced by calculation of bfactor |
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42 | ! |
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43 | ! 221 2009-01-12 15:32:23Z raasch |
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44 | ! Bugfix: abort in case that absolute temperature is below zero |
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45 | ! |
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46 | ! 95 2007-06-02 16:48:38Z raasch |
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47 | ! hydro_press renamed hyp |
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48 | ! |
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49 | ! February 2007 |
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50 | ! RCS Log replace by Id keyword, revision history cleaned up |
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51 | ! |
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52 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
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53 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
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54 | ! latent_heat renamed l_v |
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55 | ! |
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56 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
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57 | ! Initial revision |
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58 | ! |
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59 | ! |
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60 | ! Description: |
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61 | ! ------------ |
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62 | ! Initialization of parameters for handling cloud-physics |
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63 | !------------------------------------------------------------------------------! |
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64 | |
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65 | USE arrays_3d |
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66 | USE cloud_parameters |
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67 | USE constants |
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68 | USE control_parameters |
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69 | USE grid_variables |
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70 | USE indices |
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71 | |
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72 | IMPLICIT NONE |
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73 | |
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74 | INTEGER :: k |
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75 | REAL :: t_surface |
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76 | |
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77 | ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1), & |
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78 | hyrho(nzb:nzt+1) ) |
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79 | |
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80 | ! |
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81 | !-- Calculate frequently used parameters |
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82 | l_d_cp = l_v / cp |
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83 | l_d_r = l_v / r_d |
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84 | l_d_rv = l_v / r_v |
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85 | |
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86 | schmidt_p_1d3 = schmidt**( 1.0 / 3.0 ) |
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87 | |
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88 | pirho_l = pi * rho_l / 6.0 |
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89 | dpirho_l = 1.0 / pirho_l |
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90 | ! |
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91 | !-- Calculate timestep according to precipitation |
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92 | IF ( icloud_scheme == 0 .AND. precipitation ) THEN |
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93 | dt_precipitation = c_sedimentation * MINVAL( dzu(nzb+2:nzt) ) / & |
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94 | w_precipitation |
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95 | ENDIF |
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96 | ! |
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97 | !-- Calculate factor used in equation for droplet growth by condensation |
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98 | bfactor = 3.0 * vanthoff * mass_of_solute * molecular_weight_of_water & |
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99 | / ( 4.0 * pi * rho_l * molecular_weight_of_solute ) |
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100 | ! |
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101 | !-- Calculate: |
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102 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
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103 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
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104 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) |
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105 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
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106 | DO k = nzb, nzt+1 |
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107 | ! |
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108 | !-- Check temperature in case of too large domain height |
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109 | IF ( ( t_surface - g/cp * zu(k) ) < 0.0 ) THEN |
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110 | WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & |
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111 | ') = ', zu(k) |
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112 | CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) |
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113 | ENDIF |
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114 | hyp(k) = surface_pressure * 100.0 * & |
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115 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
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116 | pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286 |
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117 | t_d_pt(k) = 1.0 / pt_d_t(k) |
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118 | hyrho(k) = hyp(k) / ( r_d * t_d_pt(k) * pt_init(k) ) |
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119 | ENDDO |
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120 | |
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121 | ! |
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122 | !-- Compute reference density |
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123 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
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124 | |
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125 | |
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126 | END SUBROUTINE init_cloud_physics |
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