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 | ! $Id: init_cloud_physics.f90 226 2009-02-02 07:39:34Z raasch $ |
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11 | ! |
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12 | ! 221 2009-01-12 15:32:23Z raasch |
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13 | ! Bugfix: abort in case that absolute temperature is below zero |
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14 | ! |
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15 | ! 95 2007-06-02 16:48:38Z raasch |
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16 | ! hydro_press renamed hyp |
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17 | ! |
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18 | ! February 2007 |
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19 | ! RCS Log replace by Id keyword, revision history cleaned up |
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20 | ! |
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21 | ! Revision 1.5 2005/06/26 19:55:58 raasch |
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22 | ! Initialization of cloud droplet constants, gas_constant renamed r_d, |
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23 | ! latent_heat renamed l_v |
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24 | ! |
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25 | ! Revision 1.1 2000/04/13 14:37:22 schroeter |
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26 | ! Initial revision |
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27 | ! |
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28 | ! |
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29 | ! Description: |
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30 | ! ------------ |
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31 | ! Initialization of parameters for handling cloud-physics |
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32 | !------------------------------------------------------------------------------! |
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33 | |
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34 | USE arrays_3d |
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35 | USE cloud_parameters |
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36 | USE control_parameters |
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37 | USE grid_variables |
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38 | USE indices |
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39 | |
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40 | IMPLICIT NONE |
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41 | |
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42 | INTEGER :: k |
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43 | REAL :: t_surface |
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44 | |
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45 | ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) ) |
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46 | |
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47 | ! |
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48 | !-- Compute frequently used parameters |
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49 | l_d_cp = l_v / cp |
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50 | l_d_r = l_v / r_d |
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51 | l_d_rv = l_v / r_v |
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52 | |
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53 | ! |
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54 | !-- Constant b in equation for droplet growth by condensation / evaporation. |
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55 | !-- Factor 1E-3 is needed because formula is in cgs units |
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56 | mass_of_solute = 1.0E-17 ! in kg |
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57 | molecular_weight_of_solute = 58.5 ! NaCl |
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58 | b_cond = 4.3 * 2.0 * mass_of_solute / molecular_weight_of_solute * 1.0E-6 |
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59 | |
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60 | ! |
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61 | !-- Calculate: |
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62 | !-- pt / t : ratio of potential and actual temperature (pt_d_t) |
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63 | !-- t / pt : ratio of actual and potential temperature (t_d_pt) |
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64 | !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) |
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65 | t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 |
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66 | DO k = nzb, nzt+1 |
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67 | ! |
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68 | !-- Check temperature in case of too large domain height |
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69 | IF ( ( t_surface - g/cp * zu(k) ) < 0.0 ) THEN |
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70 | WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & |
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71 | ') = ', zu(k) |
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72 | CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) |
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73 | ENDIF |
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74 | hyp(k) = surface_pressure * 100.0 * & |
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75 | ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) |
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76 | pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286 |
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77 | t_d_pt(k) = 1.0 / pt_d_t(k) |
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78 | ENDDO |
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79 | |
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80 | ! |
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81 | !-- Compute reference density |
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82 | rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) |
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83 | |
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84 | |
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85 | END SUBROUTINE init_cloud_physics |
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