source: palm/trunk/SOURCE/init_ocean.f90 @ 1834

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1!> @file init_ocean.f90
2!--------------------------------------------------------------------------------!
3! This file is part of PALM.
4!
5! PALM is free software: you can redistribute it and/or modify it under the terms
6! of the GNU General Public License as published by the Free Software Foundation,
7! either version 3 of the License, or (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with
14! PALM. If not, see <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2016 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------!
18!
19! Current revisions:
20! -----------------
21!
22!
23! Former revisions:
24! ------------------
25! $Id: init_ocean.f90 1818 2016-04-06 15:53:27Z raasch $
26!
27! 1682 2015-10-07 23:56:08Z knoop
28! Code annotations made doxygen readable
29!
30! 1353 2014-04-08 15:21:23Z heinze
31! REAL constants provided with KIND-attribute
32!
33! 1322 2014-03-20 16:38:49Z raasch
34! REAL constants defined as wp_kind
35!
36! 1320 2014-03-20 08:40:49Z raasch
37! ONLY-attribute added to USE-statements,
38! kind-parameters added to all INTEGER and REAL declaration statements,
39! kinds are defined in new module kinds,
40! revision history before 2012 removed,
41! comment fields (!:) to be used for variable explanations added to
42! all variable declaration statements
43!
44! 1179 2013-06-14 05:57:58Z raasch
45! Initial density profile is stored in array hom
46!
47! 1036 2012-10-22 13:43:42Z raasch
48! code put under GPL (PALM 3.9)
49!
50! 97 2007-06-21 08:23:15Z raasch
51! Initial revision
52!
53! Description:
54! ------------
55!> Initialization of quantities needed for the ocean version
56!------------------------------------------------------------------------------!
57 SUBROUTINE init_ocean
58 
59
60    USE arrays_3d,                                                             &
61        ONLY:  dzu, hyp, pt_init, ref_state, sa_init, zu, zw
62
63    USE control_parameters,                                                    &
64        ONLY:  g, prho_reference, rho_surface, rho_reference,                  &
65               surface_pressure, use_single_reference_value
66
67    USE eqn_state_seawater_mod,                                                &
68        ONLY:  eqn_state_seawater, eqn_state_seawater_func
69
70    USE indices,                                                               &
71        ONLY:  nzb, nzt
72
73    USE kinds
74
75    USE pegrid
76
77    USE statistics,                                                            &
78        ONLY:  hom, statistic_regions
79
80    IMPLICIT NONE
81
82    INTEGER(iwp) ::  k !<
83    INTEGER(iwp) ::  n !<
84
85    REAL(wp)     ::  pt_l !<
86    REAL(wp)     ::  sa_l !<
87
88    REAL(wp), DIMENSION(nzb:nzt+1) ::  rho_init !<
89
90    ALLOCATE( hyp(nzb:nzt+1) )
91
92!
93!-- Set water density near the ocean surface
94    rho_surface = 1027.62_wp
95
96!
97!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
98!-- and the reference density (used later in buoyancy term)
99!-- First step: Calculate pressure using reference density
100    hyp(nzt+1) = surface_pressure * 100.0_wp
101
102    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5_wp * dzu(nzt+1)
103    rho_init(nzt) = rho_surface
104
105    DO  k = nzt-1, 1, -1
106       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
107    ENDDO
108    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
109
110!
111!-- Second step: Iteratively calculate in situ density (based on presssure)
112!-- and pressure (based on in situ density)
113    DO  n = 1, 5
114
115       rho_reference = rho_surface * 0.5_wp * dzu(nzt+1)
116
117       DO  k = nzt-1, 0, -1
118
119          sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
120          pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
121
122          rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
123
124          rho_reference = rho_reference + rho_init(k) * dzu(k+1)
125
126       ENDDO
127
128       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
129
130       DO  k = nzt-1, 0, -1
131          hyp(k) = hyp(k+1) + g * 0.5_wp * ( rho_init(k) + rho_init(k+1 ) ) * &
132                              dzu(k+1)
133       ENDDO
134
135    ENDDO
136
137!
138!-- Calculate the reference potential density
139    prho_reference = 0.0_wp
140    DO  k = 0, nzt
141
142       sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
143       pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
144
145       prho_reference = prho_reference + dzu(k+1) * &
146                        eqn_state_seawater_func( 0.0_wp, pt_l, sa_l )
147
148    ENDDO
149
150    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
151
152!
153!-- Calculate the 3d array of initial in situ and potential density,
154!-- based on the initial temperature and salinity profile
155    CALL eqn_state_seawater
156
157!
158!-- Store initial density profile
159    hom(:,1,77,:)  = SPREAD( rho_init(:), 2, statistic_regions+1 )
160
161!
162!-- Set the reference state to be used in the buoyancy terms
163    IF ( use_single_reference_value )  THEN
164       ref_state(:) = prho_reference
165    ELSE
166       ref_state(:) = rho_init(:)
167    ENDIF
168
169
170 END SUBROUTINE init_ocean
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