source: palm/trunk/SOURCE/init_cloud_physics.f90 @ 1323

Last change on this file since 1323 was 1323, checked in by raasch, 8 years ago

last commit documented

  • Property svn:keywords set to Id
File size: 5.0 KB
RevLine 
[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!
[1310]17! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]18!--------------------------------------------------------------------------------!
19!
[484]20! Current revisions:
[1]21! -----------------
[1321]22!
[1323]23!
[1321]24! Former revisions:
25! ------------------
26! $Id: init_cloud_physics.f90 1323 2014-03-20 17:09:54Z raasch $
[1323]27!
28! 1322 2014-03-20 16:38:49Z raasch
29! REAL constants defined as wp-kind
[1321]30!
31! 1320 2014-03-20 08:40:49Z raasch
[1320]32! ONLY-attribute added to USE-statements,
33! kind-parameters added to all INTEGER and REAL declaration statements,
34! kinds are defined in new module mod_kinds,
35! revision history before 2012 removed,
36! comment fields (!:) to be used for variable explanations added to
37! all variable declaration statements
[1054]38!
[1066]39! 1065 2012-11-22 17:42:36Z hoffmann
40! The Courant number of sedimentation can be controlled with c_sedimentation.
41!
[1054]42! 1053 2012-11-13 17:11:03Z hoffmann
[1053]43! calculation of the maximum timestep according to the terminal velocity of rain
44! drops in the two moment cloud scheme
[1]45!
[1053]46! calculation of frequently used constants (pirho_l, dpirho_l, schmidt_p_1d3,
47! hyrho)
48!
[1037]49! 1036 2012-10-22 13:43:42Z raasch
50! code put under GPL (PALM 3.9)
51!
[826]52! 824 2012-02-17 09:09:57Z raasch
53! calculation of b_cond replaced by calculation of bfactor
54!
[1]55! Revision 1.1  2000/04/13 14:37:22  schroeter
56! Initial revision
57!
58!
59! Description:
60! ------------
61! Initialization of parameters for handling cloud-physics
62!------------------------------------------------------------------------------!
63
[1320]64    USE arrays_3d,                                                             &
65        ONLY:  dzu, hyp, pt_init, zu
66       
67    USE cloud_parameters,                                                      &
68        ONLY:  bfactor, cp, c_sedimentation, dpirho_l, dt_precipitation,       &
69               hyrho, l_d_cp, l_d_r, l_d_rv, l_v, mass_of_solute,              &
70               molecular_weight_of_solute, molecular_weight_of_water, pirho_l, &
71               pt_d_t, rho_l, r_d, r_v, schmidt, schmidt_p_1d3, t_d_pt,        &
72               vanthoff, w_precipitation
73       
74    USE constants,                                                             &
75        ONLY:  pi
76       
77    USE control_parameters,                                                    &
78        ONLY:  g, icloud_scheme, message_string, precipitation, pt_surface,    &
79               rho_surface, surface_pressure
80   
81    USE indices,                                                               &
82        ONLY:  nzb, nzt
83   
84    USE kinds
[1]85
86    IMPLICIT NONE
87
[1320]88    INTEGER(iwp) ::  k      !:
89   
90    REAL(wp) ::  t_surface  !:
[1]91
[1053]92    ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1),  &
93              hyrho(nzb:nzt+1) )
[1]94
95!
[824]96!-- Calculate frequently used parameters
[1]97    l_d_cp = l_v / cp
98    l_d_r  = l_v / r_d
99    l_d_rv = l_v / r_v
[1053]100
[1322]101    schmidt_p_1d3 = schmidt**( 1.0_wp / 3.0_wp )
[1053]102
103    pirho_l  = pi * rho_l / 6.0
104    dpirho_l = 1.0 / pirho_l
[1]105!
[1053]106!-- Calculate timestep according to precipitation
107    IF ( icloud_scheme == 0  .AND.  precipitation )  THEN
[1065]108       dt_precipitation = c_sedimentation * MINVAL( dzu(nzb+2:nzt) ) /        &
109                          w_precipitation
[1053]110    ENDIF
111!
[824]112!-- Calculate factor used in equation for droplet growth by condensation
113    bfactor = 3.0 * vanthoff * mass_of_solute * molecular_weight_of_water &
114              / ( 4.0 * pi * rho_l * molecular_weight_of_solute )
[1]115!
116!-- Calculate:
117!-- pt / t : ratio of potential and actual temperature (pt_d_t)
118!-- t / pt : ratio of actual and potential temperature (t_d_pt)
[95]119!-- p_0(z) : vertical profile of the hydrostatic pressure (hyp)
[1]120    t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286
121    DO  k = nzb, nzt+1
[221]122!
123!--    Check temperature in case of too large domain height
124       IF ( ( t_surface - g/cp * zu(k) ) < 0.0 )  THEN
125          WRITE( message_string, * )  'absolute temperature < 0.0 at zu(', k, &
126                                      ') = ', zu(k)
[226]127          CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 )
[221]128       ENDIF
[95]129       hyp(k)    = surface_pressure * 100.0 * &
[1322]130                   ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0_wp/0.286_wp)
[95]131       pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286
[1053]132       t_d_pt(k) = 1.0 / pt_d_t(k)
133       hyrho(k)  = hyp(k) / ( r_d * t_d_pt(k) * pt_init(k) )       
[1]134    ENDDO
135
136!
137!-- Compute reference density
138    rho_surface = surface_pressure * 100.0 / ( r_d * t_surface )
139
140
141 END SUBROUTINE init_cloud_physics
Note: See TracBrowser for help on using the repository browser.