SUBROUTINE init_ocean !--------------------------------------------------------------------------------! ! This file is part of PALM. ! ! PALM is free software: you can redistribute it and/or modify it under the terms ! of the GNU General Public License as published by the Free Software Foundation, ! either version 3 of the License, or (at your option) any later version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License along with ! PALM. If not, see . ! ! Copyright 1997-2012 Leibniz University Hannover !--------------------------------------------------------------------------------! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ------------------ ! $Id: init_ocean.f90 1182 2013-06-14 09:07:24Z Giersch $ ! ! 1179 2013-06-14 05:57:58Z raasch ! Initial density profile is stored in array hom ! ! 1036 2012-10-22 13:43:42Z raasch ! code put under GPL (PALM 3.9) ! ! 388 2009-09-23 09:40:33Z raasch ! Bugfix: Initial profiles of hydrostatic pressure and density are calculated ! iteratively. First calculation of hyp(0) changed. ! ! 124 2007-10-19 15:47:46Z raasch ! Bugfix: Initial density rho is calculated ! ! 97 2007-06-21 08:23:15Z raasch ! Initial revision ! ! Description: ! ------------ ! Initialization of quantities needed for the ocean version !------------------------------------------------------------------------------! USE arrays_3d USE control_parameters USE eqn_state_seawater_mod USE grid_variables USE indices USE pegrid USE statistics IMPLICIT NONE INTEGER :: k, n REAL :: sa_l, pt_l REAL, DIMENSION(nzb:nzt+1) :: rho_init ALLOCATE( hyp(nzb:nzt+1) ) ! !-- Set water density near the ocean surface rho_surface = 1027.62 ! !-- Calculate initial vertical profile of hydrostatic pressure (in Pa) !-- and the reference density (used later in buoyancy term) !-- First step: Calculate pressure using reference density hyp(nzt+1) = surface_pressure * 100.0 hyp(nzt) = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1) rho_init(nzt) = rho_surface DO k = nzt-1, 1, -1 hyp(k) = hyp(k+1) + rho_surface * g * dzu(k) ENDDO hyp(0) = hyp(1) + rho_surface * g * dzu(1) ! !-- Second step: Iteratively calculate in situ density (based on presssure) !-- and pressure (based on in situ density) DO n = 1, 5 rho_reference = rho_surface * 0.5 * dzu(nzt+1) DO k = nzt-1, 0, -1 sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l ) rho_reference = rho_reference + rho_init(k) * dzu(k+1) ENDDO rho_reference = rho_reference / ( zw(nzt) - zu(nzb) ) DO k = nzt-1, 0, -1 hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * & dzu(k+1) ENDDO ENDDO ! !-- Calculate the reference potential density prho_reference = 0.0 DO k = 0, nzt sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) ) pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) ) prho_reference = prho_reference + dzu(k+1) * & eqn_state_seawater_func( 0.0, pt_l, sa_l ) ENDDO prho_reference = prho_reference / ( zu(nzt) - zu(nzb) ) ! !-- Calculate the 3d array of initial in situ and potential density, !-- based on the initial temperature and salinity profile CALL eqn_state_seawater ! !-- Store initial density profile hom(:,1,77,:) = SPREAD( rho_init(:), 2, statistic_regions+1 ) ! !-- Set the reference state to be used in the buoyancy terms IF ( use_single_reference_value ) THEN ref_state(:) = prho_reference ELSE ref_state(:) = rho_init(:) ENDIF END SUBROUTINE init_ocean