source: palm/trunk/SOURCE/init_ocean.f90 @ 1182

Last change on this file since 1182 was 1182, checked in by raasch, 8 years ago

last commit documented, rc-file for example run updated

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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 1997-2012  Leibniz University Hannover
18!--------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! ------------------
26! $Id: init_ocean.f90 1182 2013-06-14 09:07:24Z raasch $
27!
28! 1179 2013-06-14 05:57:58Z raasch
29! Initial density profile is stored in array hom
30!
31! 1036 2012-10-22 13:43:42Z raasch
32! code put under GPL (PALM 3.9)
33!
34! 388 2009-09-23 09:40:33Z raasch
35! Bugfix: Initial profiles of hydrostatic pressure and density are calculated
36! iteratively. First calculation of hyp(0) changed.
37!
38! 124 2007-10-19 15:47:46Z raasch
39! Bugfix: Initial density rho is calculated
40!
41! 97 2007-06-21 08:23:15Z raasch
42! Initial revision
43!
44! Description:
45! ------------
46! Initialization of quantities needed for the ocean version
47!------------------------------------------------------------------------------!
48
49    USE arrays_3d
50    USE control_parameters
51    USE eqn_state_seawater_mod
52    USE grid_variables
53    USE indices
54    USE pegrid
55    USE statistics
56
57    IMPLICIT NONE
58
59    INTEGER ::  k, n
60
61    REAL    ::  sa_l, pt_l
62
63    REAL, DIMENSION(nzb:nzt+1) ::  rho_init
64
65    ALLOCATE( hyp(nzb:nzt+1) )
66
67!
68!-- Set water density near the ocean surface
69    rho_surface = 1027.62
70
71!
72!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
73!-- and the reference density (used later in buoyancy term)
74!-- First step: Calculate pressure using reference density
75    hyp(nzt+1) = surface_pressure * 100.0
76
77    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5 * dzu(nzt+1)
78    rho_init(nzt) = rho_surface
79
80    DO  k = nzt-1, 1, -1
81       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
82    ENDDO
83    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
84
85!
86!-- Second step: Iteratively calculate in situ density (based on presssure)
87!-- and pressure (based on in situ density)
88    DO  n = 1, 5
89
90       rho_reference = rho_surface * 0.5 * dzu(nzt+1)
91
92       DO  k = nzt-1, 0, -1
93
94          sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) )
95          pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) )
96
97          rho_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
98
99          rho_reference = rho_reference + rho_init(k) * dzu(k+1)
100
101       ENDDO
102
103       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
104
105       DO  k = nzt-1, 0, -1
106          hyp(k) = hyp(k+1) + g * 0.5 * ( rho_init(k) + rho_init(k+1 ) ) * &
107                              dzu(k+1)
108       ENDDO
109
110    ENDDO
111
112!
113!-- Calculate the reference potential density
114    prho_reference = 0.0
115    DO  k = 0, nzt
116
117       sa_l = 0.5 * ( sa_init(k) + sa_init(k+1) )
118       pt_l = 0.5 * ( pt_init(k) + pt_init(k+1) )
119
120       prho_reference = prho_reference + dzu(k+1) * &
121                        eqn_state_seawater_func( 0.0, pt_l, sa_l )
122
123    ENDDO
124
125    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
126
127!
128!-- Calculate the 3d array of initial in situ and potential density,
129!-- based on the initial temperature and salinity profile
130    CALL eqn_state_seawater
131
132!
133!-- Store initial density profile
134    hom(:,1,77,:)  = SPREAD( rho_init(:), 2, statistic_regions+1 )
135
136!
137!-- Set the reference state to be used in the buoyancy terms
138    IF ( use_single_reference_value )  THEN
139       ref_state(:) = prho_reference
140    ELSE
141       ref_state(:) = rho_init(:)
142    ENDIF
143
144
145 END SUBROUTINE init_ocean
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