source: palm/trunk/SOURCE/init_ocean.f90 @ 2845

Last change on this file since 2845 was 2845, checked in by raasch, 4 years ago

bugfix: set kinematic viscosity for sea water

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1!> @file init_ocean.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
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 1997-2018 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! ------------------
26! $Id: init_ocean.f90 2845 2018-03-01 08:32:34Z raasch $
27! bugfix: set kinematic viscosity for sea water
28!
29! 2718 2018-01-02 08:49:38Z maronga
30! Corrected "Former revisions" section
31!
32! 2696 2017-12-14 17:12:51Z kanani
33! Change in file header (GPL part)
34!
35! 2502 2017-09-26 15:51:59Z gronemeier
36! Bugfix: use equation of state for seawater to calculate rho_ocean_init at nzt
37!
38! 2195 2017-03-23 08:15:17Z raasch
39!
40! 2194 2017-03-23 08:03:04Z raasch
41! bugfix: density is now used in single-value reference state instead of
42! potential density
43!
44! 2031 2016-10-21 15:11:58Z knoop
45! renamed variable rho_init to rho_ocean_init
46!
47! 2000 2016-08-20 18:09:15Z knoop
48! Forced header and separation lines into 80 columns
49!
50! 1682 2015-10-07 23:56:08Z knoop
51! Code annotations made doxygen readable
52!
53! 1353 2014-04-08 15:21:23Z heinze
54! REAL constants provided with KIND-attribute
55!
56! 1322 2014-03-20 16:38:49Z raasch
57! REAL constants defined as wp_kind
58!
59! 1320 2014-03-20 08:40:49Z raasch
60! ONLY-attribute added to USE-statements,
61! kind-parameters added to all INTEGER and REAL declaration statements,
62! kinds are defined in new module kinds,
63! revision history before 2012 removed,
64! comment fields (!:) to be used for variable explanations added to
65! all variable declaration statements
66!
67! 1179 2013-06-14 05:57:58Z raasch
68! Initial density profile is stored in array hom
69!
70! 1036 2012-10-22 13:43:42Z raasch
71! code put under GPL (PALM 3.9)
72!
73! 97 2007-06-21 08:23:15Z raasch
74! Initial revision
75!
76! Description:
77! ------------
78!> Initialization of quantities needed for the ocean version
79!------------------------------------------------------------------------------!
80 SUBROUTINE init_ocean
81 
82
83    USE arrays_3d,                                                             &
84        ONLY:  dzu, hyp, pt_init, ref_state, sa_init, zu, zw
85
86    USE control_parameters,                                                    &
87        ONLY:  g, prho_reference, rho_surface, rho_reference,                  &
88               surface_pressure, use_single_reference_value
89
90    USE eqn_state_seawater_mod,                                                &
91        ONLY:  eqn_state_seawater, eqn_state_seawater_func
92
93    USE indices,                                                               &
94        ONLY:  nzb, nzt
95
96    USE kinds
97
98    USE pegrid
99
100    USE statistics,                                                            &
101        ONLY:  hom, statistic_regions
102
103    IMPLICIT NONE
104
105    INTEGER(iwp) ::  k !<
106    INTEGER(iwp) ::  n !<
107
108    REAL(wp)     ::  pt_l !<
109    REAL(wp)     ::  sa_l !<
110
111    REAL(wp), DIMENSION(nzb:nzt+1) ::  rho_ocean_init !<
112
113    ALLOCATE( hyp(nzb:nzt+1) )
114
115!
116!-- Set water density near the ocean surface
117    rho_surface = 1027.62_wp
118
119!
120!-- Set kinematic viscosity to sea water at 20C
121!-- WARNING: This value is especially used for calculating terminal fall
122!--          velocities in the LPM, so lpm_init should always be called after
123!--          init_ocean!
124    molecular_viscosity = 1.05E-6_wp
125
126!
127!-- Calculate initial vertical profile of hydrostatic pressure (in Pa)
128!-- and the reference density (used later in buoyancy term)
129!-- First step: Calculate pressure using reference density
130    hyp(nzt+1) = surface_pressure * 100.0_wp
131
132    hyp(nzt)      = hyp(nzt+1) + rho_surface * g * 0.5_wp * dzu(nzt+1)
133    rho_ocean_init(nzt) = rho_surface
134
135    DO  k = nzt-1, 1, -1
136       hyp(k) = hyp(k+1) + rho_surface * g * dzu(k)
137    ENDDO
138    hyp(0) = hyp(1) + rho_surface * g * dzu(1)
139
140!
141!-- Second step: Iteratively calculate in situ density (based on presssure)
142!-- and pressure (based on in situ density)
143    DO  n = 1, 5
144
145       rho_reference = rho_surface * 0.5_wp * dzu(nzt+1)
146
147       DO  k = nzt, 0, -1
148
149          sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
150          pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
151
152          rho_ocean_init(k) = eqn_state_seawater_func( hyp(k), pt_l, sa_l )
153
154          rho_reference = rho_reference + rho_ocean_init(k) * dzu(k+1)
155
156       ENDDO
157
158       rho_reference = rho_reference / ( zw(nzt) - zu(nzb) )
159
160       DO  k = nzt, 0, -1
161          hyp(k) = hyp(k+1) + g * 0.5_wp * ( rho_ocean_init(k)                 &
162                                           + rho_ocean_init(k+1) ) * dzu(k+1)
163       ENDDO
164
165    ENDDO
166
167!
168!-- Calculate the reference potential density
169    prho_reference = 0.0_wp
170    DO  k = 0, nzt
171
172       sa_l = 0.5_wp * ( sa_init(k) + sa_init(k+1) )
173       pt_l = 0.5_wp * ( pt_init(k) + pt_init(k+1) )
174
175       prho_reference = prho_reference + dzu(k+1) * &
176                        eqn_state_seawater_func( 0.0_wp, pt_l, sa_l )
177
178    ENDDO
179
180    prho_reference = prho_reference / ( zu(nzt) - zu(nzb) )
181
182!
183!-- Calculate the 3d array of initial in situ and potential density,
184!-- based on the initial temperature and salinity profile
185    CALL eqn_state_seawater
186
187!
188!-- Store initial density profile
189    hom(:,1,77,:)  = SPREAD( rho_ocean_init(:), 2, statistic_regions+1 )
190
191!
192!-- Set the reference state to be used in the buoyancy terms
193    IF ( use_single_reference_value )  THEN
194       ref_state(:) = rho_reference
195    ELSE
196       ref_state(:) = rho_ocean_init(:)
197    ENDIF
198
199
200 END SUBROUTINE init_ocean
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