| 1 | SUBROUTINE init_cloud_physics |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Actual revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ------------------ |
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| 10 | ! $Log: init_cloud_physics.f90,v $ |
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| 11 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
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| 12 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
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| 13 | ! latent_heat renamed l_v |
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| 14 | ! |
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| 15 | ! Revision 1.4 2001/03/30 07:26:30 raasch |
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| 16 | ! Translation of remaining German identifiers (variables, subroutines, etc.), |
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| 17 | ! surface_pressure keeps unit hPa and is not converted to Pa |
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| 18 | ! |
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| 19 | ! Revision 1.3 2001/01/25 07:03:10 raasch |
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| 20 | ! Module test_variables removed |
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| 21 | ! |
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| 22 | ! Revision 1.2 2001/01/22 09:16:57 schroeter |
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| 23 | ! To calculate verticle pressure profile use actual surface-temperature in |
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| 24 | ! place of potential temperature as reference value. |
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| 25 | ! |
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| 26 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
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| 27 | ! Initial revision |
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| 28 | ! |
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| 29 | ! |
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| 30 | ! Description: |
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| 31 | ! ------------ |
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| 32 | ! Initialization of parameters for handling cloud-physics |
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| 33 | !------------------------------------------------------------------------------! |
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| 34 | |
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| 35 | USE arrays_3d |
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| 36 | USE cloud_parameters |
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| 37 | USE control_parameters |
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| 38 | USE grid_variables |
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| 39 | USE indices |
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| 40 | |
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| 41 | IMPLICIT NONE |
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| 42 | |
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| 43 | INTEGER :: k |
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| 44 | REAL :: t_surface |
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| 45 | |
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| 46 | ALLOCATE( hydro_press(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) ) |
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| 47 | |
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| 48 | ! |
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| 49 | !-- Compute frequently used parameters |
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| 50 | l_d_cp = l_v / cp |
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| 51 | l_d_r = l_v / r_d |
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| 52 | l_d_rv = l_v / r_v |
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| 53 | |
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| 54 | ! |
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| 55 | !-- Constant b in equation for droplet growth by condensation / evaporation. |
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| 56 | !-- Factor 1E-3 is needed because formula is in cgs units |
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| 57 | mass_of_solute = 1.0E-17 ! in kg |
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| 58 | molecular_weight_of_solute = 58.5 ! NaCl |
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| 59 | b_cond = 4.3 * 2.0 * mass_of_solute / molecular_weight_of_solute * 1.0E-6 |
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| 60 | |
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| 61 | ! |
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| 62 | !-- Calculate: |
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| 63 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
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| 64 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
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| 65 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hydro_press) |
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| 66 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
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| 67 | DO k = nzb, nzt+1 |
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| 68 | hydro_press(k) = surface_pressure * 100.0 * & |
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| 69 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
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| 70 | pt_d_t(k) = ( 100000.0 / hydro_press(k) )**0.286 |
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| 71 | t_d_pt(k) = 1.0 / pt_d_t(k) |
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| 72 | ENDDO |
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| 73 | |
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| 74 | ! |
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| 75 | !-- Compute reference density |
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| 76 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
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| 77 | |
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| 78 | |
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| 79 | END SUBROUTINE init_cloud_physics |
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