1 | SUBROUTINE init_cloud_physics |
---|
2 | |
---|
3 | !------------------------------------------------------------------------------! |
---|
4 | ! Current revisions: |
---|
5 | ! ----------------- |
---|
6 | ! |
---|
7 | ! |
---|
8 | ! Former revisions: |
---|
9 | ! ------------------ |
---|
10 | ! $Id: init_cloud_physics.f90 484 2010-02-05 07:36:54Z suehring $ |
---|
11 | ! |
---|
12 | ! 221 2009-01-12 15:32:23Z raasch |
---|
13 | ! Bugfix: abort in case that absolute temperature is below zero |
---|
14 | ! |
---|
15 | ! 95 2007-06-02 16:48:38Z raasch |
---|
16 | ! hydro_press renamed hyp |
---|
17 | ! |
---|
18 | ! February 2007 |
---|
19 | ! RCS Log replace by Id keyword, revision history cleaned up |
---|
20 | ! |
---|
21 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
---|
22 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
---|
23 | ! latent_heat renamed l_v |
---|
24 | ! |
---|
25 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
---|
26 | ! Initial revision |
---|
27 | ! |
---|
28 | ! |
---|
29 | ! Description: |
---|
30 | ! ------------ |
---|
31 | ! Initialization of parameters for handling cloud-physics |
---|
32 | !------------------------------------------------------------------------------! |
---|
33 | |
---|
34 | USE arrays_3d |
---|
35 | USE cloud_parameters |
---|
36 | USE control_parameters |
---|
37 | USE grid_variables |
---|
38 | USE indices |
---|
39 | |
---|
40 | IMPLICIT NONE |
---|
41 | |
---|
42 | INTEGER :: k |
---|
43 | REAL :: t_surface |
---|
44 | |
---|
45 | ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) ) |
---|
46 | |
---|
47 | ! |
---|
48 | !-- Compute frequently used parameters |
---|
49 | l_d_cp = l_v / cp |
---|
50 | l_d_r = l_v / r_d |
---|
51 | l_d_rv = l_v / r_v |
---|
52 | |
---|
53 | ! |
---|
54 | !-- Constant b in equation for droplet growth by condensation / evaporation. |
---|
55 | !-- Factor 1E-3 is needed because formula is in cgs units |
---|
56 | mass_of_solute = 1.0E-17 ! in kg |
---|
57 | molecular_weight_of_solute = 58.5 ! NaCl |
---|
58 | b_cond = 4.3 * 2.0 * mass_of_solute / molecular_weight_of_solute * 1.0E-6 |
---|
59 | |
---|
60 | ! |
---|
61 | !-- Calculate: |
---|
62 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
---|
63 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
---|
64 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) |
---|
65 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
---|
66 | DO k = nzb, nzt+1 |
---|
67 | ! |
---|
68 | !-- Check temperature in case of too large domain height |
---|
69 | IF ( ( t_surface - g/cp * zu(k) ) < 0.0 ) THEN |
---|
70 | WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & |
---|
71 | ') = ', zu(k) |
---|
72 | CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) |
---|
73 | ENDIF |
---|
74 | hyp(k) = surface_pressure * 100.0 * & |
---|
75 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
---|
76 | pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286 |
---|
77 | t_d_pt(k) = 1.0 / pt_d_t(k) |
---|
78 | ENDDO |
---|
79 | |
---|
80 | ! |
---|
81 | !-- Compute reference density |
---|
82 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
---|
83 | |
---|
84 | |
---|
85 | END SUBROUTINE init_cloud_physics |
---|