source: palm/trunk/SOURCE/init_cloud_physics.f90 @ 1036

Last change on this file since 1036 was 1036, checked in by raasch, 9 years ago

code has been put under the GNU General Public License (v3)

  • Property svn:keywords set to Id
File size: 3.2 KB
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[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! -----------------
[826]22!
[1]23!
24! Former revisions:
25! ------------------
[3]26! $Id: init_cloud_physics.f90 1036 2012-10-22 13:43:42Z raasch $
[98]27!
[826]28! 824 2012-02-17 09:09:57Z raasch
29! calculation of b_cond replaced by calculation of bfactor
30!
[226]31! 221 2009-01-12 15:32:23Z raasch
32! Bugfix: abort in case that absolute temperature is below zero
33!
[98]34! 95 2007-06-02 16:48:38Z raasch
35! hydro_press renamed hyp
36!
37! February 2007
[3]38! RCS Log replace by Id keyword, revision history cleaned up
39!
[1]40! Revision 1.5  2005/06/26 19:55:58  raasch
41! Initialization of cloud droplet constants, gas_constant renamed r_d,
42! latent_heat renamed l_v
43!
44! Revision 1.1  2000/04/13 14:37:22  schroeter
45! Initial revision
46!
47!
48! Description:
49! ------------
50! Initialization of parameters for handling cloud-physics
51!------------------------------------------------------------------------------!
52
53    USE arrays_3d
54    USE cloud_parameters
[824]55    USE constants
[1]56    USE control_parameters
57    USE grid_variables
58    USE indices
59
60    IMPLICIT NONE
61
62    INTEGER ::  k
63    REAL    ::  t_surface
64
[95]65    ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) )
[1]66
67!
[824]68!-- Calculate frequently used parameters
[1]69    l_d_cp = l_v / cp
70    l_d_r  = l_v / r_d
71    l_d_rv = l_v / r_v
72!
[824]73!-- Calculate factor used in equation for droplet growth by condensation
74    bfactor = 3.0 * vanthoff * mass_of_solute * molecular_weight_of_water &
75              / ( 4.0 * pi * rho_l * molecular_weight_of_solute )
[1]76!
77!-- Calculate:
78!-- pt / t : ratio of potential and actual temperature (pt_d_t)
79!-- t / pt : ratio of actual and potential temperature (t_d_pt)
[95]80!-- p_0(z) : vertical profile of the hydrostatic pressure (hyp)
[1]81    t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286
82    DO  k = nzb, nzt+1
[221]83!
84!--    Check temperature in case of too large domain height
85       IF ( ( t_surface - g/cp * zu(k) ) < 0.0 )  THEN
86          WRITE( message_string, * )  'absolute temperature < 0.0 at zu(', k, &
87                                      ') = ', zu(k)
[226]88          CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 )
[221]89       ENDIF
[95]90       hyp(k)    = surface_pressure * 100.0 * &
91                   ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286)
92       pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286
93       t_d_pt(k) = 1.0 / pt_d_t(k)       
[1]94    ENDDO
95
96!
97!-- Compute reference density
98    rho_surface = surface_pressure * 100.0 / ( r_d * t_surface )
99
100
101 END SUBROUTINE init_cloud_physics
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