[1] | 1 | SUBROUTINE init_cloud_physics |
---|
| 2 | |
---|
[1036] | 3 | !--------------------------------------------------------------------------------! |
---|
| 4 | ! This file is part of PALM. |
---|
| 5 | ! |
---|
| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
---|
| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
---|
| 8 | ! either version 3 of the License, or (at your option) any later version. |
---|
| 9 | ! |
---|
| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
---|
| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
---|
| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
---|
| 13 | ! |
---|
| 14 | ! You should have received a copy of the GNU General Public License along with |
---|
| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
---|
| 16 | ! |
---|
| 17 | ! Copyright 1997-2012 Leibniz University Hannover |
---|
| 18 | !--------------------------------------------------------------------------------! |
---|
| 19 | ! |
---|
[484] | 20 | ! Current revisions: |
---|
[1] | 21 | ! ----------------- |
---|
[1054] | 22 | ! |
---|
| 23 | ! Former revisions: |
---|
| 24 | ! ------------------ |
---|
| 25 | ! $Id: init_cloud_physics.f90 1066 2012-11-22 17:52:43Z heinze $ |
---|
| 26 | ! |
---|
[1066] | 27 | ! 1065 2012-11-22 17:42:36Z hoffmann |
---|
| 28 | ! The Courant number of sedimentation can be controlled with c_sedimentation. |
---|
| 29 | ! |
---|
[1054] | 30 | ! 1053 2012-11-13 17:11:03Z hoffmann |
---|
[1053] | 31 | ! calculation of the maximum timestep according to the terminal velocity of rain |
---|
| 32 | ! drops in the two moment cloud scheme |
---|
[1] | 33 | ! |
---|
[1053] | 34 | ! calculation of frequently used constants (pirho_l, dpirho_l, schmidt_p_1d3, |
---|
| 35 | ! hyrho) |
---|
| 36 | ! |
---|
[1037] | 37 | ! 1036 2012-10-22 13:43:42Z raasch |
---|
| 38 | ! code put under GPL (PALM 3.9) |
---|
| 39 | ! |
---|
[826] | 40 | ! 824 2012-02-17 09:09:57Z raasch |
---|
| 41 | ! calculation of b_cond replaced by calculation of bfactor |
---|
| 42 | ! |
---|
[226] | 43 | ! 221 2009-01-12 15:32:23Z raasch |
---|
| 44 | ! Bugfix: abort in case that absolute temperature is below zero |
---|
| 45 | ! |
---|
[98] | 46 | ! 95 2007-06-02 16:48:38Z raasch |
---|
| 47 | ! hydro_press renamed hyp |
---|
| 48 | ! |
---|
| 49 | ! February 2007 |
---|
[3] | 50 | ! RCS Log replace by Id keyword, revision history cleaned up |
---|
| 51 | ! |
---|
[1] | 52 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
---|
| 53 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
---|
| 54 | ! latent_heat renamed l_v |
---|
| 55 | ! |
---|
| 56 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
---|
| 57 | ! Initial revision |
---|
| 58 | ! |
---|
| 59 | ! |
---|
| 60 | ! Description: |
---|
| 61 | ! ------------ |
---|
| 62 | ! Initialization of parameters for handling cloud-physics |
---|
| 63 | !------------------------------------------------------------------------------! |
---|
| 64 | |
---|
| 65 | USE arrays_3d |
---|
| 66 | USE cloud_parameters |
---|
[824] | 67 | USE constants |
---|
[1] | 68 | USE control_parameters |
---|
| 69 | USE grid_variables |
---|
| 70 | USE indices |
---|
| 71 | |
---|
| 72 | IMPLICIT NONE |
---|
| 73 | |
---|
| 74 | INTEGER :: k |
---|
| 75 | REAL :: t_surface |
---|
| 76 | |
---|
[1053] | 77 | ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1), & |
---|
| 78 | hyrho(nzb:nzt+1) ) |
---|
[1] | 79 | |
---|
| 80 | ! |
---|
[824] | 81 | !-- Calculate frequently used parameters |
---|
[1] | 82 | l_d_cp = l_v / cp |
---|
| 83 | l_d_r = l_v / r_d |
---|
| 84 | l_d_rv = l_v / r_v |
---|
[1053] | 85 | |
---|
| 86 | schmidt_p_1d3 = schmidt**( 1.0 / 3.0 ) |
---|
| 87 | |
---|
| 88 | pirho_l = pi * rho_l / 6.0 |
---|
| 89 | dpirho_l = 1.0 / pirho_l |
---|
[1] | 90 | ! |
---|
[1053] | 91 | !-- Calculate timestep according to precipitation |
---|
| 92 | IF ( icloud_scheme == 0 .AND. precipitation ) THEN |
---|
[1065] | 93 | dt_precipitation = c_sedimentation * MINVAL( dzu(nzb+2:nzt) ) / & |
---|
| 94 | w_precipitation |
---|
[1053] | 95 | ENDIF |
---|
| 96 | ! |
---|
[824] | 97 | !-- Calculate factor used in equation for droplet growth by condensation |
---|
| 98 | bfactor = 3.0 * vanthoff * mass_of_solute * molecular_weight_of_water & |
---|
| 99 | / ( 4.0 * pi * rho_l * molecular_weight_of_solute ) |
---|
[1] | 100 | ! |
---|
| 101 | !-- Calculate: |
---|
| 102 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
---|
| 103 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
---|
[95] | 104 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) |
---|
[1] | 105 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
---|
| 106 | DO k = nzb, nzt+1 |
---|
[221] | 107 | ! |
---|
| 108 | !-- Check temperature in case of too large domain height |
---|
| 109 | IF ( ( t_surface - g/cp * zu(k) ) < 0.0 ) THEN |
---|
| 110 | WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & |
---|
| 111 | ') = ', zu(k) |
---|
[226] | 112 | CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) |
---|
[221] | 113 | ENDIF |
---|
[95] | 114 | hyp(k) = surface_pressure * 100.0 * & |
---|
| 115 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
---|
| 116 | pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286 |
---|
[1053] | 117 | t_d_pt(k) = 1.0 / pt_d_t(k) |
---|
| 118 | hyrho(k) = hyp(k) / ( r_d * t_d_pt(k) * pt_init(k) ) |
---|
[1] | 119 | ENDDO |
---|
| 120 | |
---|
| 121 | ! |
---|
| 122 | !-- Compute reference density |
---|
| 123 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
---|
| 124 | |
---|
| 125 | |
---|
| 126 | END SUBROUTINE init_cloud_physics |
---|