| 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | subroutine getfields(itime,nstop) |
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| 23 | ! i o |
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| 24 | !***************************************************************************** |
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| 25 | ! * |
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| 26 | ! This subroutine manages the 3 data fields to be kept in memory. * |
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| 27 | ! During the first time step of petterssen it has to be fulfilled that the * |
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| 28 | ! first data field must have |wftime|<itime, i.e. the absolute value of * |
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| 29 | ! wftime must be smaller than the absolute value of the current time in [s].* |
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| 30 | ! The other 2 fields are the next in time after the first one. * |
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| 31 | ! Pointers (memind) are used, because otherwise one would have to resort the* |
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| 32 | ! wind fields, which costs a lot of computing time. Here only the pointers * |
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| 33 | ! are resorted. * |
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| 34 | ! * |
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| 35 | ! Author: A. Stohl * |
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| 36 | ! * |
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| 37 | ! 29 April 1994 * |
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| 38 | ! * |
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| 39 | !***************************************************************************** |
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| 40 | ! Changes, Bernd C. Krueger, Feb. 2001: |
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| 41 | ! Variables tth,qvh,tthn,qvhn (on eta coordinates) in common block. |
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| 42 | ! Function of nstop extended. |
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| 43 | !***************************************************************************** |
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| 44 | ! * |
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| 45 | ! Variables: * |
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| 46 | ! lwindinterval [s] time difference between the two wind fields read in * |
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| 47 | ! indj indicates the number of the wind field to be read in * |
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| 48 | ! indmin remembers the number of wind fields already treated * |
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| 49 | ! memind(2) pointer, on which place the wind fields are stored * |
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| 50 | ! memtime(2) [s] times of the wind fields, which are kept in memory * |
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| 51 | ! itime [s] current time since start date of trajectory calcu- * |
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| 52 | ! lation * |
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| 53 | ! nstop > 0, if trajectory has to be terminated * |
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| 54 | ! nx,ny,nuvz,nwz field dimensions in x,y and z direction * |
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| 55 | ! uu(0:nxmax,0:nymax,nuvzmax,2) wind components in x-direction [m/s] * |
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| 56 | ! vv(0:nxmax,0:nymax,nuvzmax,2) wind components in y-direction [m/s] * |
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| 57 | ! ww(0:nxmax,0:nymax,nwzmax,2) wind components in z-direction [deltaeta/s]* |
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| 58 | ! tt(0:nxmax,0:nymax,nuvzmax,2) temperature [K] * |
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| 59 | ! ps(0:nxmax,0:nymax,2) surface pressure [Pa] * |
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| 60 | ! * |
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| 61 | ! Constants: * |
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| 62 | ! idiffmax maximum allowable time difference between 2 wind * |
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| 63 | ! fields * |
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| 64 | ! * |
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| 65 | !***************************************************************************** |
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| 66 | |
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| 67 | use par_mod |
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| 68 | use com_mod |
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| 69 | |
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| 70 | implicit none |
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| 71 | |
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| 72 | integer :: indj,itime,nstop,memaux |
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| 73 | |
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| 74 | real(kind=4),allocatable,dimension(:,:,:) :: uuh |
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| 75 | real(kind=4),allocatable,dimension(:,:,:) :: vvh |
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| 76 | real(kind=4),allocatable,dimension(:,:,:) :: pvh |
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| 77 | real(kind=4),allocatable,dimension(:,:,:) :: wwh |
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| 78 | real(kind=4),allocatable,dimension(:,:,:,:) :: uuhn |
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| 79 | real(kind=4),allocatable,dimension(:,:,:,:) :: vvhn |
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| 80 | real(kind=4),allocatable,dimension(:,:,:,:) :: pvhn |
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| 81 | real(kind=4),allocatable,dimension(:,:,:,:) :: wwhn |
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| 82 | |
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| 83 | integer :: indmin = 1 |
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| 84 | integer :: stat |
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| 85 | |
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| 86 | |
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| 87 | ! Check, if wind fields are available for the current time step |
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| 88 | !************************************************************** |
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| 89 | |
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| 90 | allocate(uuh(0:nxmax-1,0:nymax-1,nuvzmax),stat=stat) |
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| 91 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 92 | allocate(vvh(0:nxmax-1,0:nymax-1,nuvzmax),stat=stat) |
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| 93 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 94 | allocate(pvh(0:nxmax-1,0:nymax-1,nuvzmax),stat=stat) |
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| 95 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 96 | allocate(wwh(0:nxmax-1,0:nymax-1,nwzmax),stat=stat) |
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| 97 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 98 | if (maxnests.gt.0) then |
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| 99 | allocate(uuhn(0:nxmax-1,0:nymax-1,nuvzmax,maxnests),stat=stat) |
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| 100 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 101 | allocate(vvhn(0:nxmax-1,0:nymax-1,nuvzmax,maxnests),stat=stat) |
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| 102 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 103 | allocate(pvhn(0:nxmax-1,0:nymax-1,nuvzmax,maxnests),stat=stat) |
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| 104 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 105 | allocate(wwhn(0:nxmax-1,0:nymax-1,nwzmax,maxnests),stat=stat) |
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| 106 | if (stat.ne.0) print*,'ERROR: could not allocate uuh' |
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| 107 | endif |
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| 108 | |
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| 109 | nstop=0 |
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| 110 | if ((ldirect*wftime(1).gt.ldirect*itime).or. & |
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| 111 | (ldirect*wftime(numbwf).lt.ldirect*itime)) then |
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| 112 | write(*,*) 'FLEXPART WARNING: NO WIND FIELDS ARE AVAILABLE.' |
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| 113 | write(*,*) 'A TRAJECTORY HAS TO BE TERMINATED.' |
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| 114 | nstop=4 |
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| 115 | return |
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| 116 | endif |
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| 117 | |
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| 118 | |
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| 119 | if ((ldirect*memtime(1).le.ldirect*itime).and. & |
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| 120 | (ldirect*memtime(2).gt.ldirect*itime)) then |
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| 121 | |
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| 122 | ! The right wind fields are already in memory -> don't do anything |
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| 123 | !***************************************************************** |
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| 124 | |
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| 125 | continue |
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| 126 | |
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| 127 | else if ((ldirect*memtime(2).le.ldirect*itime).and. & |
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| 128 | (memtime(2).ne.999999999)) then |
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| 129 | |
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| 130 | |
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| 131 | ! Current time is after 2nd wind field |
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| 132 | ! -> Resort wind field pointers, so that current time is between 1st and 2nd |
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| 133 | !*************************************************************************** |
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| 134 | |
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| 135 | memaux=memind(1) |
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| 136 | memind(1)=memind(2) |
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| 137 | memind(2)=memaux |
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| 138 | memtime(1)=memtime(2) |
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| 139 | |
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| 140 | |
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| 141 | ! Read a new wind field and store it on place memind(2) |
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| 142 | !****************************************************** |
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| 143 | |
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| 144 | do indj=indmin,numbwf-1 |
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| 145 | if (ldirect*wftime(indj+1).gt.ldirect*itime) then |
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| 146 | memtime(2)=wftime(indj+1) |
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| 147 | call readwind(indj+1,memind(2),uuh,vvh,wwh) |
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| 148 | call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn) |
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| 149 | call calcpar(memind(2),uuh,vvh,pvh) |
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| 150 | call calcpar_nests(memind(2),uuhn,vvhn,pvhn) |
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| 151 | call verttransform(memind(2),uuh,vvh,wwh,pvh) |
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| 152 | call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn) |
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| 153 | nstop = 1 |
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| 154 | goto 40 |
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| 155 | endif |
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| 156 | end do |
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| 157 | 40 indmin=indj |
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| 158 | |
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| 159 | else |
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| 160 | |
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| 161 | ! No wind fields, which can be used, are currently in memory |
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| 162 | ! -> read both wind fields |
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| 163 | !*********************************************************** |
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| 164 | |
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| 165 | do indj=indmin,numbwf-1 |
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| 166 | if ((ldirect*wftime(indj).le.ldirect*itime).and. & |
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| 167 | (ldirect*wftime(indj+1).gt.ldirect*itime)) then |
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| 168 | memind(1)=1 |
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| 169 | memtime(1)=wftime(indj) |
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| 170 | !hes: setting memtime before call to calcpar, assures that correct time is used in getvdep |
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| 171 | call readwind(indj,memind(1),uuh,vvh,wwh) |
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| 172 | call readwind_nests(indj,memind(1),uuhn,vvhn,wwhn) |
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| 173 | call calcpar(memind(1),uuh,vvh,pvh) |
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| 174 | call calcpar_nests(memind(1),uuhn,vvhn,pvhn) |
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| 175 | call verttransform(memind(1),uuh,vvh,wwh,pvh) |
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| 176 | call verttransform_nests(memind(1),uuhn,vvhn,wwhn,pvhn) |
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| 177 | memind(2)=2 |
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| 178 | memtime(2)=wftime(indj+1) |
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| 179 | call readwind(indj+1,memind(2),uuh,vvh,wwh) |
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| 180 | call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn) |
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| 181 | call calcpar(memind(2),uuh,vvh,pvh) |
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| 182 | call calcpar_nests(memind(2),uuhn,vvhn,pvhn) |
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| 183 | call verttransform(memind(2),uuh,vvh,wwh,pvh) |
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| 184 | call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn) |
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| 185 | nstop = 1 |
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| 186 | goto 60 |
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| 187 | endif |
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| 188 | end do |
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| 189 | 60 indmin=indj |
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| 190 | |
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| 191 | endif |
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| 192 | |
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| 193 | lwindinterv=abs(memtime(2)-memtime(1)) |
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| 194 | |
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| 195 | if (lwindinterv.gt.idiffmax) nstop=3 |
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| 196 | |
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| 197 | deallocate(uuh) |
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| 198 | deallocate(vvh) |
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| 199 | deallocate(wwh) |
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| 200 | deallocate(pvh) |
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| 201 | if (maxnests.gt.0) then |
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| 202 | deallocate(uuhn) |
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| 203 | deallocate(vvhn) |
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| 204 | deallocate(wwhn) |
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| 205 | deallocate(pvhn) |
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| 206 | endif |
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| 207 | |
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| 208 | end subroutine getfields |
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