source: branches/FLEXPART_9.1.3/src/getfields.f90 @ 13

Last change on this file since 13 was 13, checked in by saeck, 9 years ago

update to wetdepo.f90

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1!**********************************************************************
2! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010         *
3! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa,             *
4! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann   *
5!                                                                     *
6! This file is part of FLEXPART.                                      *
7!                                                                     *
8! FLEXPART is free software: you can redistribute it and/or modify    *
9! it under the terms of the GNU General Public License as published by*
10! the Free Software Foundation, either version 3 of the License, or   *
11! (at your option) any later version.                                 *
12!                                                                     *
13! FLEXPART is distributed in the hope that it will be useful,         *
14! but WITHOUT ANY WARRANTY; without even the implied warranty of      *
15! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       *
16! GNU General Public License for more details.                        *
17!                                                                     *
18! You should have received a copy of the GNU General Public License   *
19! along with FLEXPART.  If not, see <http://www.gnu.org/licenses/>.   *
20!**********************************************************************
21
22subroutine getfields(itime,nstop)
23  !                       i     o
24  !*****************************************************************************
25  !                                                                            *
26  !  This subroutine manages the 3 data fields to be kept in memory.           *
27  !  During the first time step of petterssen it has to be fulfilled that the  *
28  !  first data field must have |wftime|<itime, i.e. the absolute value of     *
29  !  wftime must be smaller than the absolute value of the current time in [s].*
30  !  The other 2 fields are the next in time after the first one.              *
31  !  Pointers (memind) are used, because otherwise one would have to resort the*
32  !  wind fields, which costs a lot of computing time. Here only the pointers  *
33  !  are resorted.                                                             *
34  !                                                                            *
35  !     Author: A. Stohl                                                       *
36  !                                                                            *
37  !     29 April 1994                                                          *
38  !                                                                            *
39  !*****************************************************************************
40  !  Changes, Bernd C. Krueger, Feb. 2001:
41  !   Variables tth,qvh,tthn,qvhn (on eta coordinates) in common block.
42  !   Function of nstop extended.
43  !*****************************************************************************
44  !                                                                            *
45  ! Variables:                                                                 *
46  ! lwindinterval [s]    time difference between the two wind fields read in   *
47  ! indj                 indicates the number of the wind field to be read in  *
48  ! indmin               remembers the number of wind fields already treated   *
49  ! memind(2)            pointer, on which place the wind fields are stored    *
50  ! memtime(2) [s]       times of the wind fields, which are kept in memory    *
51  ! itime [s]            current time since start date of trajectory calcu-    *
52  !                      lation                                                *
53  ! nstop                > 0, if trajectory has to be terminated               *
54  ! nx,ny,nuvz,nwz       field dimensions in x,y and z direction               *
55  ! uu(0:nxmax,0:nymax,nuvzmax,2)   wind components in x-direction [m/s]       *
56  ! vv(0:nxmax,0:nymax,nuvzmax,2)   wind components in y-direction [m/s]       *
57  ! ww(0:nxmax,0:nymax,nwzmax,2)    wind components in z-direction [deltaeta/s]*
58  ! tt(0:nxmax,0:nymax,nuvzmax,2)   temperature [K]                            *
59  ! ps(0:nxmax,0:nymax,2)           surface pressure [Pa]                      *
60  !                                                                            *
61  ! Constants:                                                                 *
62  ! idiffmax             maximum allowable time difference between 2 wind      *
63  !                      fields                                                *
64  !                                                                            *
65  !*****************************************************************************
66
67  use par_mod
68  use com_mod
69
70  implicit none
71
72  integer :: indj,itime,nstop,memaux
73
74  real :: uuh(0:nxmax-1,0:nymax-1,nuvzmax)
75  real :: vvh(0:nxmax-1,0:nymax-1,nuvzmax)
76  real :: pvh(0:nxmax-1,0:nymax-1,nuvzmax)
77  real :: wwh(0:nxmax-1,0:nymax-1,nwzmax)
78  real :: uuhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
79  real :: vvhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
80  real :: pvhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
81  real :: wwhn(0:nxmaxn-1,0:nymaxn-1,nwzmax,maxnests)
82
83  integer :: indmin = 1
84
85
86  ! Check, if wind fields are available for the current time step
87  !**************************************************************
88
89  nstop=0
90
91  if ((ldirect*wftime(1).gt.ldirect*itime).or. &
92       (ldirect*wftime(numbwf).lt.ldirect*itime)) then
93    write(*,*) 'FLEXPART WARNING: NO WIND FIELDS ARE AVAILABLE.'
94    write(*,*) 'A TRAJECTORY HAS TO BE TERMINATED.'
95    nstop=4
96    return
97  endif
98
99
100  if ((ldirect*memtime(1).le.ldirect*itime).and. &
101       (ldirect*memtime(2).gt.ldirect*itime)) then
102
103  ! The right wind fields are already in memory -> don't do anything
104  !*****************************************************************
105
106    continue
107
108  else if ((ldirect*memtime(2).le.ldirect*itime).and. &
109       (memtime(2).ne.999999999)) then
110
111
112  ! Current time is after 2nd wind field
113  ! -> Resort wind field pointers, so that current time is between 1st and 2nd
114  !***************************************************************************
115
116    memaux=memind(1)
117    memind(1)=memind(2)
118    memind(2)=memaux
119    memtime(1)=memtime(2)
120
121
122  ! Read a new wind field and store it on place memind(2)
123  !******************************************************
124
125    do indj=indmin,numbwf-1
126       if (ldirect*wftime(indj+1).gt.ldirect*itime) then
127          call readwind(indj+1,memind(2),uuh,vvh,wwh)
128          call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn)
129          call calcpar(memind(2),uuh,vvh,pvh)
130          call calcpar_nests(memind(2),uuhn,vvhn,pvhn)
131          call verttransform(memind(2),uuh,vvh,wwh,pvh)
132          call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn)
133          memtime(2)=wftime(indj+1)
134          nstop = 1
135          goto 40
136       endif
137    end do
138 40   indmin=indj
139
140  else
141
142  ! No wind fields, which can be used, are currently in memory
143  ! -> read both wind fields
144  !***********************************************************
145
146     do indj=indmin,numbwf-1
147        if ((ldirect*wftime(indj).le.ldirect*itime).and. &
148             (ldirect*wftime(indj+1).gt.ldirect*itime)) then
149           memind(1)=1
150           call readwind(indj,memind(1),uuh,vvh,wwh)
151           call readwind_nests(indj,memind(1),uuhn,vvhn,wwhn)
152           call calcpar(memind(1),uuh,vvh,pvh)
153           call calcpar_nests(memind(1),uuhn,vvhn,pvhn)
154           call verttransform(memind(1),uuh,vvh,wwh,pvh)
155           call verttransform_nests(memind(1),uuhn,vvhn,wwhn,pvhn)
156           memtime(1)=wftime(indj)
157           memind(2)=2
158           call readwind(indj+1,memind(2),uuh,vvh,wwh)
159           call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn)
160           call calcpar(memind(2),uuh,vvh,pvh)
161           call calcpar_nests(memind(2),uuhn,vvhn,pvhn)
162           call verttransform(memind(2),uuh,vvh,wwh,pvh)
163           call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn)
164           memtime(2)=wftime(indj+1)
165           nstop = 1
166           goto 60
167        endif
168     end do
169 60   indmin=indj
170
171  endif
172
173  lwindinterv=abs(memtime(2)-memtime(1))
174
175  if (lwindinterv.gt.idiffmax) nstop=3
176
177end subroutine getfields
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