source: palm/trunk/SOURCE/init_ocean.f90 @ 2031

Last change on this file since 2031 was 2031, checked in by knoop, 6 years ago

Renamed variable rho to rho_ocean, rho_init to rho_ocean_init and rho_av to rho_ocean_av

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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
6! terms of the GNU General Public License as published by the Free Software
7! Foundation, either version 3 of the License, or (at your option) any later
8! 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 1997-2016 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22! renamed variable rho_init to rho_ocean_init
23!
24! Former revisions:
25! ------------------
26! $Id: init_ocean.f90 2031 2016-10-21 15:11:58Z knoop $
27!
28! 2000 2016-08-20 18:09:15Z knoop
29! Forced header and separation lines into 80 columns
30!
31! 1682 2015-10-07 23:56:08Z knoop
32! Code annotations made doxygen readable
33!
34! 1353 2014-04-08 15:21:23Z heinze
35! REAL constants provided with KIND-attribute
36!
37! 1322 2014-03-20 16:38:49Z raasch
38! REAL constants defined as wp_kind
39!
40! 1320 2014-03-20 08:40:49Z raasch
41! ONLY-attribute added to USE-statements,
42! kind-parameters added to all INTEGER and REAL declaration statements,
43! kinds are defined in new module kinds,
44! revision history before 2012 removed,
45! comment fields (!:) to be used for variable explanations added to
46! all variable declaration statements
47!
48! 1179 2013-06-14 05:57:58Z raasch
49! Initial density profile is stored in array hom
50!
51! 1036 2012-10-22 13:43:42Z raasch
52! code put under GPL (PALM 3.9)
53!
54! 97 2007-06-21 08:23:15Z raasch
55! Initial revision
56!
57! Description:
58! ------------
59!> Initialization of quantities needed for the ocean version
60!------------------------------------------------------------------------------!
61 SUBROUTINE init_ocean
62 
63
64    USE arrays_3d,                                                             &
65        ONLY:  dzu, hyp, pt_init, ref_state, sa_init, zu, zw
66
67    USE control_parameters,                                                    &
68        ONLY:  g, prho_reference, rho_surface, rho_reference,                  &
69               surface_pressure, use_single_reference_value
70
71    USE eqn_state_seawater_mod,                                                &
72        ONLY:  eqn_state_seawater, eqn_state_seawater_func
73
74    USE indices,                                                               &
75        ONLY:  nzb, nzt
76
77    USE kinds
78
79    USE pegrid
80
81    USE statistics,                                                            &
82        ONLY:  hom, statistic_regions
83
84    IMPLICIT NONE
85
86    INTEGER(iwp) ::  k !<
87    INTEGER(iwp) ::  n !<
88
89    REAL(wp)     ::  pt_l !<
90    REAL(wp)     ::  sa_l !<
91
92    REAL(wp), DIMENSION(nzb:nzt+1) ::  rho_ocean_init !<
93
94    ALLOCATE( hyp(nzb:nzt+1) )
95
96!
97!-- Set water density near the ocean surface
98    rho_surface = 1027.62_wp
99
100!
101!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
102!-- and the reference density (used later in buoyancy term)
103!-- First step: Calculate pressure using reference density
104    hyp(nzt+1) = surface_pressure * 100.0_wp
105
106    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5_wp * dzu(nzt+1)
107    rho_ocean_init(nzt) = rho_surface
108
109    DO  k = nzt-1, 1, -1
110       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
111    ENDDO
112    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
113
114!
115!-- Second step: Iteratively calculate in situ density (based on presssure)
116!-- and pressure (based on in situ density)
117    DO  n = 1, 5
118
119       rho_reference = rho_surface * 0.5_wp * dzu(nzt+1)
120
121       DO  k = nzt-1, 0, -1
122
123          sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
124          pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
125
126          rho_ocean_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
127
128          rho_reference = rho_reference + rho_ocean_init(k) * dzu(k+1)
129
130       ENDDO
131
132       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
133
134       DO  k = nzt-1, 0, -1
135          hyp(k) = hyp(k+1) + g * 0.5_wp * ( rho_ocean_init(k) + rho_ocean_init(k+1 ) ) * &
136                              dzu(k+1)
137       ENDDO
138
139    ENDDO
140
141!
142!-- Calculate the reference potential density
143    prho_reference = 0.0_wp
144    DO  k = 0, nzt
145
146       sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
147       pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
148
149       prho_reference = prho_reference + dzu(k+1) * &
150                        eqn_state_seawater_func( 0.0_wp, pt_l, sa_l )
151
152    ENDDO
153
154    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
155
156!
157!-- Calculate the 3d array of initial in situ and potential density,
158!-- based on the initial temperature and salinity profile
159    CALL eqn_state_seawater
160
161!
162!-- Store initial density profile
163    hom(:,1,77,:)  = SPREAD( rho_ocean_init(:), 2, statistic_regions+1 )
164
165!
166!-- Set the reference state to be used in the buoyancy terms
167    IF ( use_single_reference_value )  THEN
168       ref_state(:) = prho_reference
169    ELSE
170       ref_state(:) = rho_ocean_init(:)
171    ENDIF
172
173
174 END SUBROUTINE init_ocean
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