SUBROUTINE init_cloud_physics !------------------------------------------------------------------------------! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ------------------ ! $Id: init_cloud_physics.f90 484 2010-02-05 07:36:54Z suehring $ ! ! 221 2009-01-12 15:32:23Z raasch ! Bugfix: abort in case that absolute temperature is below zero ! ! 95 2007-06-02 16:48:38Z raasch ! hydro_press renamed hyp ! ! February 2007 ! RCS Log replace by Id keyword, revision history cleaned up ! ! Revision 1.5 2005/06/26 19:55:58 raasch ! Initialization of cloud droplet constants, gas_constant renamed r_d, ! latent_heat renamed l_v ! ! Revision 1.1 2000/04/13 14:37:22 schroeter ! Initial revision ! ! ! Description: ! ------------ ! Initialization of parameters for handling cloud-physics !------------------------------------------------------------------------------! USE arrays_3d USE cloud_parameters USE control_parameters USE grid_variables USE indices IMPLICIT NONE INTEGER :: k REAL :: t_surface ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1) ) ! !-- Compute frequently used parameters l_d_cp = l_v / cp l_d_r = l_v / r_d l_d_rv = l_v / r_v ! !-- Constant b in equation for droplet growth by condensation / evaporation. !-- Factor 1E-3 is needed because formula is in cgs units mass_of_solute = 1.0E-17 ! in kg molecular_weight_of_solute = 58.5 ! NaCl b_cond = 4.3 * 2.0 * mass_of_solute / molecular_weight_of_solute * 1.0E-6 ! !-- Calculate: !-- pt / t : ratio of potential and actual temperature (pt_d_t) !-- t / pt : ratio of actual and potential temperature (t_d_pt) !-- p_0(z) : vertical profile of the hydrostatic pressure (hyp) t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286 DO k = nzb, nzt+1 ! !-- Check temperature in case of too large domain height IF ( ( t_surface - g/cp * zu(k) ) < 0.0 ) THEN WRITE( message_string, * ) 'absolute temperature < 0.0 at zu(', k, & ') = ', zu(k) CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 ) ENDIF hyp(k) = surface_pressure * 100.0 * & ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286) pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286 t_d_pt(k) = 1.0 / pt_d_t(k) ENDDO ! !-- Compute reference density rho_surface = surface_pressure * 100.0 / ( r_d * t_surface ) END SUBROUTINE init_cloud_physics