| 1 | SUBROUTINE init_cloud_physics |
|---|
| 2 | |
|---|
| 3 | !------------------------------------------------------------------------------! |
|---|
| 4 | ! Actual revisions: |
|---|
| 5 | ! ----------------- |
|---|
| 6 | ! |
|---|
| 7 | ! |
|---|
| 8 | ! Former revisions: |
|---|
| 9 | ! ------------------ |
|---|
| 10 | ! $Id: init_cloud_physics.f90 4 2007-02-13 11:33:16Z raasch $ |
|---|
| 11 | ! RCS Log replace by Id keyword, revision history cleaned up |
|---|
| 12 | ! |
|---|
| 13 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
|---|
| 14 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
|---|
| 15 | ! latent_heat renamed l_v |
|---|
| 16 | ! |
|---|
| 17 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
|---|
| 18 | ! Initial revision |
|---|
| 19 | ! |
|---|
| 20 | ! |
|---|
| 21 | ! Description: |
|---|
| 22 | ! ------------ |
|---|
| 23 | ! Initialization of parameters for handling cloud-physics |
|---|
| 24 | !------------------------------------------------------------------------------! |
|---|
| 25 | |
|---|
| 26 | USE arrays_3d |
|---|
| 27 | USE cloud_parameters |
|---|
| 28 | USE control_parameters |
|---|
| 29 | USE grid_variables |
|---|
| 30 | USE indices |
|---|
| 31 | |
|---|
| 32 | IMPLICIT NONE |
|---|
| 33 | |
|---|
| 34 | INTEGER :: k |
|---|
| 35 | REAL :: t_surface |
|---|
| 36 | |
|---|
| 37 | ALLOCATE( hydro_press(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) ) |
|---|
| 38 | |
|---|
| 39 | ! |
|---|
| 40 | !-- Compute frequently used parameters |
|---|
| 41 | l_d_cp = l_v / cp |
|---|
| 42 | l_d_r = l_v / r_d |
|---|
| 43 | l_d_rv = l_v / r_v |
|---|
| 44 | |
|---|
| 45 | ! |
|---|
| 46 | !-- Constant b in equation for droplet growth by condensation / evaporation. |
|---|
| 47 | !-- Factor 1E-3 is needed because formula is in cgs units |
|---|
| 48 | mass_of_solute = 1.0E-17 ! in kg |
|---|
| 49 | molecular_weight_of_solute = 58.5 ! NaCl |
|---|
| 50 | b_cond = 4.3 * 2.0 * mass_of_solute / molecular_weight_of_solute * 1.0E-6 |
|---|
| 51 | |
|---|
| 52 | ! |
|---|
| 53 | !-- Calculate: |
|---|
| 54 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
|---|
| 55 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
|---|
| 56 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hydro_press) |
|---|
| 57 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
|---|
| 58 | DO k = nzb, nzt+1 |
|---|
| 59 | hydro_press(k) = surface_pressure * 100.0 * & |
|---|
| 60 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
|---|
| 61 | pt_d_t(k) = ( 100000.0 / hydro_press(k) )**0.286 |
|---|
| 62 | t_d_pt(k) = 1.0 / pt_d_t(k) |
|---|
| 63 | ENDDO |
|---|
| 64 | |
|---|
| 65 | ! |
|---|
| 66 | !-- Compute reference density |
|---|
| 67 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
|---|
| 68 | |
|---|
| 69 | |
|---|
| 70 | END SUBROUTINE init_cloud_physics |
|---|
