source: palm/trunk/SOURCE/init_ocean.f90 @ 1323

Last change on this file since 1323 was 1323, checked in by raasch, 8 years ago

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1 SUBROUTINE init_ocean
2
3!--------------------------------------------------------------------------------!
4! This file is part of PALM.
5!
6! PALM is free software: you can redistribute it and/or modify it under the terms
7! of the GNU General Public License as published by the Free Software Foundation,
8! either version 3 of the License, or (at your option) any later version.
9!
10! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
13!
14! You should have received a copy of the GNU General Public License along with
15! PALM. If not, see <http://www.gnu.org/licenses/>.
16!
17! Copyright 1997-2014 Leibniz Universitaet Hannover
18!--------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! ------------------
26! $Id: init_ocean.f90 1323 2014-03-20 17:09:54Z raasch $
27!
28! 1322 2014-03-20 16:38:49Z raasch
29! REAL constants defined as wp_kind
30!
31! 1320 2014-03-20 08:40:49Z raasch
32! ONLY-attribute added to USE-statements,
33! kind-parameters added to all INTEGER and REAL declaration statements,
34! kinds are defined in new module kinds,
35! revision history before 2012 removed,
36! comment fields (!:) to be used for variable explanations added to
37! all variable declaration statements
38!
39! 1179 2013-06-14 05:57:58Z raasch
40! Initial density profile is stored in array hom
41!
42! 1036 2012-10-22 13:43:42Z raasch
43! code put under GPL (PALM 3.9)
44!
45! 97 2007-06-21 08:23:15Z raasch
46! Initial revision
47!
48! Description:
49! ------------
50! Initialization of quantities needed for the ocean version
51!------------------------------------------------------------------------------!
52
53    USE arrays_3d,                                                             &
54        ONLY:  dzu, hyp, pt_init, ref_state, sa_init, zu, zw
55
56    USE control_parameters,                                                    &
57        ONLY:  g, prho_reference, rho_surface, rho_reference,                  &
58               surface_pressure, use_single_reference_value
59
60    USE eqn_state_seawater_mod,                                                &
61        ONLY:  eqn_state_seawater, eqn_state_seawater_func
62
63    USE indices,                                                               &
64        ONLY:  nzb, nzt
65
66    USE kinds
67
68    USE pegrid
69
70    USE statistics,                                                            &
71        ONLY:  hom, statistic_regions
72
73    IMPLICIT NONE
74
75    INTEGER(iwp) ::  k !:
76    INTEGER(iwp) ::  n !:
77
78    REAL(wp)     ::  pt_l !:
79    REAL(wp)     ::  sa_l !:
80
81    REAL(wp), DIMENSION(nzb:nzt+1) ::  rho_init !:
82
83    ALLOCATE( hyp(nzb:nzt+1) )
84
85!
86!-- Set water density near the ocean surface
87    rho_surface = 1027.62
88
89!
90!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
91!-- and the reference density (used later in buoyancy term)
92!-- First step: Calculate pressure using reference density
93    hyp(nzt+1) = surface_pressure * 100.0_wp
94
95    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1)
96    rho_init(nzt) = rho_surface
97
98    DO  k = nzt-1, 1, -1
99       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
100    ENDDO
101    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
102
103!
104!-- Second step: Iteratively calculate in situ density (based on presssure)
105!-- and pressure (based on in situ density)
106    DO  n = 1, 5
107
108       rho_reference = rho_surface * 0.5 * dzu(nzt+1)
109
110       DO  k = nzt-1, 0, -1
111
112          sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) )
113          pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) )
114
115          rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
116
117          rho_reference = rho_reference + rho_init(k) * dzu(k+1)
118
119       ENDDO
120
121       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
122
123       DO  k = nzt-1, 0, -1
124          hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * &
125                              dzu(k+1)
126       ENDDO
127
128    ENDDO
129
130!
131!-- Calculate the reference potential density
132    prho_reference = 0.0
133    DO  k = 0, nzt
134
135       sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) )
136       pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) )
137
138       prho_reference = prho_reference + dzu(k+1) * &
139                        eqn_state_seawater_func( 0.0_wp, pt_l, sa_l )
140
141    ENDDO
142
143    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
144
145!
146!-- Calculate the 3d array of initial in situ and potential density,
147!-- based on the initial temperature and salinity profile
148    CALL eqn_state_seawater
149
150!
151!-- Store initial density profile
152    hom(:,1,77,:)  = SPREAD( rho_init(:), 2, statistic_regions+1 )
153
154!
155!-- Set the reference state to be used in the buoyancy terms
156    IF ( use_single_reference_value )  THEN
157       ref_state(:) = prho_reference
158    ELSE
159       ref_state(:) = rho_init(:)
160    ENDIF
161
162
163 END SUBROUTINE init_ocean
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