!> @file init_ocean.f90 !------------------------------------------------------------------------------! ! This file is part of the PALM model system. ! ! 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 1997-2018 Leibniz Universitaet Hannover !------------------------------------------------------------------------------! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ------------------ ! $Id: init_ocean.f90 2846 2018-03-01 08:48:47Z scharf $ ! FORTRAN bugfix for r2845 ! ! 2845 2018-03-01 08:32:34Z raasch ! bugfix: set kinematic viscosity for sea water ! ! 2718 2018-01-02 08:49:38Z maronga ! Corrected "Former revisions" section ! ! 2696 2017-12-14 17:12:51Z kanani ! Change in file header (GPL part) ! ! 2502 2017-09-26 15:51:59Z gronemeier ! Bugfix: use equation of state for seawater to calculate rho_ocean_init at nzt ! ! 2195 2017-03-23 08:15:17Z raasch ! ! 2194 2017-03-23 08:03:04Z raasch ! bugfix: density is now used in single-value reference state instead of ! potential density ! ! 2031 2016-10-21 15:11:58Z knoop ! renamed variable rho_init to rho_ocean_init ! ! 2000 2016-08-20 18:09:15Z knoop ! Forced header and separation lines into 80 columns ! ! 1682 2015-10-07 23:56:08Z knoop ! Code annotations made doxygen readable ! ! 1353 2014-04-08 15:21:23Z heinze ! REAL constants provided with KIND-attribute ! ! 1322 2014-03-20 16:38:49Z raasch ! REAL constants defined as wp_kind ! ! 1320 2014-03-20 08:40:49Z raasch ! ONLY-attribute added to USE-statements, ! kind-parameters added to all INTEGER and REAL declaration statements, ! kinds are defined in new module kinds, ! revision history before 2012 removed, ! comment fields (!:) to be used for variable explanations added to ! all variable declaration statements ! ! 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) ! ! 97 2007-06-21 08:23:15Z raasch ! Initial revision ! ! Description: ! ------------ !> Initialization of quantities needed for the ocean version !------------------------------------------------------------------------------! SUBROUTINE init_ocean USE arrays_3d, & ONLY: dzu, hyp, pt_init, ref_state, sa_init, zu, zw USE control_parameters, & ONLY: g, molecular_viscosity, prho_reference, rho_surface, & rho_reference, surface_pressure, use_single_reference_value USE eqn_state_seawater_mod, & ONLY: eqn_state_seawater, eqn_state_seawater_func USE indices, & ONLY: nzb, nzt USE kinds USE pegrid USE statistics, & ONLY: hom, statistic_regions IMPLICIT NONE INTEGER(iwp) :: k !< INTEGER(iwp) :: n !< REAL(wp) :: pt_l !< REAL(wp) :: sa_l !< REAL(wp), DIMENSION(nzb:nzt+1) :: rho_ocean_init !< ALLOCATE( hyp(nzb:nzt+1) ) ! !-- Set water density near the ocean surface rho_surface = 1027.62_wp ! !-- Set kinematic viscosity to sea water at 20C !-- WARNING: This value is especially used for calculating terminal fall !-- velocities in the LPM, so lpm_init should always be called after !-- init_ocean! molecular_viscosity = 1.05E-6_wp ! !-- 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_wp hyp(nzt) = hyp(nzt+1) + rho_surface * g * 0.5_wp * dzu(nzt+1) rho_ocean_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_wp * dzu(nzt+1) DO k = nzt, 0, -1 sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) ) pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) ) rho_ocean_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l ) rho_reference = rho_reference + rho_ocean_init(k) * dzu(k+1) ENDDO rho_reference = rho_reference / ( zw(nzt) - zu(nzb) ) DO k = nzt, 0, -1 hyp(k) = hyp(k+1) + g * 0.5_wp * ( rho_ocean_init(k) & + rho_ocean_init(k+1) ) * dzu(k+1) ENDDO ENDDO ! !-- Calculate the reference potential density prho_reference = 0.0_wp DO k = 0, nzt sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) ) pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) ) prho_reference = prho_reference + dzu(k+1) * & eqn_state_seawater_func( 0.0_wp, 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_ocean_init(:), 2, statistic_regions+1 ) ! !-- Set the reference state to be used in the buoyancy terms IF ( use_single_reference_value ) THEN ref_state(:) = rho_reference ELSE ref_state(:) = rho_ocean_init(:) ENDIF END SUBROUTINE init_ocean