source: palm/tags/release-4.0/SOURCE/init_ocean.f90 @ 3800

Last change on this file since 3800 was 1354, checked in by heinze, 10 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 1354 2014-04-08 15:22:57Z forkel $
27!
28! 1353 2014-04-08 15:21:23Z heinze
29! REAL constants provided with KIND-attribute
30!
31! 1322 2014-03-20 16:38:49Z raasch
32! REAL constants defined as wp_kind
33!
34! 1320 2014-03-20 08:40:49Z raasch
35! ONLY-attribute added to USE-statements,
36! kind-parameters added to all INTEGER and REAL declaration statements,
37! kinds are defined in new module kinds,
38! revision history before 2012 removed,
39! comment fields (!:) to be used for variable explanations added to
40! all variable declaration statements
41!
42! 1179 2013-06-14 05:57:58Z raasch
43! Initial density profile is stored in array hom
44!
45! 1036 2012-10-22 13:43:42Z raasch
46! code put under GPL (PALM 3.9)
47!
48! 97 2007-06-21 08:23:15Z raasch
49! Initial revision
50!
51! Description:
52! ------------
53! Initialization of quantities needed for the ocean version
54!------------------------------------------------------------------------------!
55
56    USE arrays_3d,                                                             &
57        ONLY:  dzu, hyp, pt_init, ref_state, sa_init, zu, zw
58
59    USE control_parameters,                                                    &
60        ONLY:  g, prho_reference, rho_surface, rho_reference,                  &
61               surface_pressure, use_single_reference_value
62
63    USE eqn_state_seawater_mod,                                                &
64        ONLY:  eqn_state_seawater, eqn_state_seawater_func
65
66    USE indices,                                                               &
67        ONLY:  nzb, nzt
68
69    USE kinds
70
71    USE pegrid
72
73    USE statistics,                                                            &
74        ONLY:  hom, statistic_regions
75
76    IMPLICIT NONE
77
78    INTEGER(iwp) ::  k !:
79    INTEGER(iwp) ::  n !:
80
81    REAL(wp)     ::  pt_l !:
82    REAL(wp)     ::  sa_l !:
83
84    REAL(wp), DIMENSION(nzb:nzt+1) ::  rho_init !:
85
86    ALLOCATE( hyp(nzb:nzt+1) )
87
88!
89!-- Set water density near the ocean surface
90    rho_surface = 1027.62_wp
91
92!
93!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
94!-- and the reference density (used later in buoyancy term)
95!-- First step: Calculate pressure using reference density
96    hyp(nzt+1) = surface_pressure * 100.0_wp
97
98    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5_wp * dzu(nzt+1)
99    rho_init(nzt) = rho_surface
100
101    DO  k = nzt-1, 1, -1
102       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
103    ENDDO
104    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
105
106!
107!-- Second step: Iteratively calculate in situ density (based on presssure)
108!-- and pressure (based on in situ density)
109    DO  n = 1, 5
110
111       rho_reference = rho_surface * 0.5_wp * dzu(nzt+1)
112
113       DO  k = nzt-1, 0, -1
114
115          sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
116          pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
117
118          rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
119
120          rho_reference = rho_reference + rho_init(k) * dzu(k+1)
121
122       ENDDO
123
124       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
125
126       DO  k = nzt-1, 0, -1
127          hyp(k) = hyp(k+1) + g * 0.5_wp * ( rho_init(k) + rho_init(k+1 ) ) * &
128                              dzu(k+1)
129       ENDDO
130
131    ENDDO
132
133!
134!-- Calculate the reference potential density
135    prho_reference = 0.0_wp
136    DO  k = 0, nzt
137
138       sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
139       pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
140
141       prho_reference = prho_reference + dzu(k+1) * &
142                        eqn_state_seawater_func( 0.0_wp, pt_l, sa_l )
143
144    ENDDO
145
146    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
147
148!
149!-- Calculate the 3d array of initial in situ and potential density,
150!-- based on the initial temperature and salinity profile
151    CALL eqn_state_seawater
152
153!
154!-- Store initial density profile
155    hom(:,1,77,:)  = SPREAD( rho_init(:), 2, statistic_regions+1 )
156
157!
158!-- Set the reference state to be used in the buoyancy terms
159    IF ( use_single_reference_value )  THEN
160       ref_state(:) = prho_reference
161    ELSE
162       ref_state(:) = rho_init(:)
163    ENDIF
164
165
166 END SUBROUTINE init_ocean
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