source: palm/trunk/SOURCE/compute_vpt.f90 @ 1683

Last change on this file since 1683 was 1683, checked in by knoop, 6 years ago

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1!> @file compute_vpt.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 terms
6! of the GNU General Public License as published by the Free Software Foundation,
7! either version 3 of the License, or (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with
14! PALM. If not, see <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2014 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------!
18!
19! Current revisions:
20! -----------------
21!
22!
23! Former revisions:
24! -----------------
25! $Id: compute_vpt.f90 1683 2015-10-07 23:57:51Z knoop $
26!
27! 1682 2015-10-07 23:56:08Z knoop
28! Code annotations made doxygen readable
29!
30! 1353 2014-04-08 15:21:23Z heinze
31! REAL constants provided with KIND-attribute
32!
33! 1320 2014-03-20 08:40:49Z raasch
34! ONLY-attribute added to USE-statements,
35! kind-parameters added to all INTEGER and REAL declaration statements,
36! kinds are defined in new module kinds,
37! revision history before 2012 removed,
38! comment fields (!:) to be used for variable explanations added to
39! all variable declaration statements
40!
41! 1036 2012-10-22 13:43:42Z raasch
42! code put under GPL (PALM 3.9)
43!
44! 803 2012-01-16 15:48:46Z franke
45! Bugfix: wrong factor in calculation of vpt in case of cloud droplets
46!
47! Revision 1.1  2000/04/13 14:40:53  schroeter
48! Initial revision
49!
50!
51! Description:
52! -------------
53!> Computation of the virtual potential temperature
54!------------------------------------------------------------------------------!
55 SUBROUTINE compute_vpt
56 
57
58    USE arrays_3d,                                                             &
59        ONLY:  pt, q, ql, vpt
60       
61    USE indices,                                                               &
62        ONLY:  nzb, nzt
63       
64    USE cloud_parameters,                                                      &
65        ONLY:  l_d_cp, pt_d_t
66       
67    USE control_parameters,                                                    &
68        ONLY:  cloud_droplets, cloud_physics
69       
70    USE kinds
71
72    IMPLICIT NONE
73
74    INTEGER(iwp) :: k   !<
75
76    IF ( .NOT. cloud_physics  .AND.  .NOT. cloud_droplets )  THEN
77       vpt = pt * ( 1.0_wp + 0.61_wp * q )
78    ELSE IF (cloud_physics)  THEN
79       DO  k = nzb, nzt+1
80          vpt(k,:,:) = ( pt(k,:,:) + pt_d_t(k) * l_d_cp * ql(k,:,:) ) *        &
81                       ( 1.0_wp + 0.61_wp * q(k,:,:) - 1.61_wp * ql(k,:,:) ) 
82       ENDDO
83    ELSE
84       vpt = pt * ( 1.0_wp + 0.61_wp * q - ql ) 
85    ENDIF
86
87 END SUBROUTINE compute_vpt
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