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!**********************************************************************
! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 *
! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, *
! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann *
! *
! This file is part of FLEXPART. *
! *
! FLEXPART is free software: you can redistribute it and/or modify *
! it under the terms of the GNU General Public License as published by*
! the Free Software Foundation, either version 3 of the License, or *
! (at your option) any later version. *
! *
! FLEXPART is distributed in the hope that it will be useful, *
! but WITHOUT ANY WARRANTY; without even the implied warranty of *
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
! GNU General Public License for more details. *
! *
! You should have received a copy of the GNU General Public License *
! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. *
!**********************************************************************
subroutine getfields(itime,nstop)
! i o
!*****************************************************************************
! *
! This subroutine manages the 3 data fields to be kept in memory. *
! During the first time step of petterssen it has to be fulfilled that the *
! first data field must have |wftime|<itime, i.e. the absolute value of *
! wftime must be smaller than the absolute value of the current time in [s].*
! The other 2 fields are the next in time after the first one. *
! Pointers (memind) are used, because otherwise one would have to resort the*
! wind fields, which costs a lot of computing time. Here only the pointers *
! are resorted. *
! *
! Author: A. Stohl *
! *
! 29 April 1994 *
! *
!*****************************************************************************
! Changes, Bernd C. Krueger, Feb. 2001:
! Variables tth,qvh,tthn,qvhn (on eta coordinates) in common block.
! Function of nstop extended.
!*****************************************************************************
! *
! Variables: *
! lwindinterval [s] time difference between the two wind fields read in *
! indj indicates the number of the wind field to be read in *
! indmin remembers the number of wind fields already treated *
! memind(2) pointer, on which place the wind fields are stored *
! memtime(2) [s] times of the wind fields, which are kept in memory *
! itime [s] current time since start date of trajectory calcu- *
! lation *
! nstop > 0, if trajectory has to be terminated *
! nx,ny,nuvz,nwz field dimensions in x,y and z direction *
! uu(0:nxmax,0:nymax,nuvzmax,2) wind components in x-direction [m/s] *
! vv(0:nxmax,0:nymax,nuvzmax,2) wind components in y-direction [m/s] *
! ww(0:nxmax,0:nymax,nwzmax,2) wind components in z-direction [deltaeta/s]*
! tt(0:nxmax,0:nymax,nuvzmax,2) temperature [K] *
! ps(0:nxmax,0:nymax,2) surface pressure [Pa] *
! *
! Constants: *
! idiffmax maximum allowable time difference between 2 wind *
! fields *
! *
!*****************************************************************************
use par_mod
use com_mod
implicit none
integer :: indj,itime,nstop,memaux
real :: uuh(0:nxmax-1,0:nymax-1,nuvzmax)
real :: vvh(0:nxmax-1,0:nymax-1,nuvzmax)
real :: pvh(0:nxmax-1,0:nymax-1,nuvzmax)
real :: wwh(0:nxmax-1,0:nymax-1,nwzmax)
real :: uuhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
real :: vvhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
real :: pvhn(0:nxmaxn-1,0:nymaxn-1,nuvzmax,maxnests)
real :: wwhn(0:nxmaxn-1,0:nymaxn-1,nwzmax,maxnests)
integer :: indmin = 1
! Check, if wind fields are available for the current time step
!**************************************************************
nstop=0
if ((ldirect*wftime(1).gt.ldirect*itime).or. &
(ldirect*wftime(numbwf).lt.ldirect*itime)) then
write(*,*) 'FLEXPART WARNING: NO WIND FIELDS ARE AVAILABLE.'
write(*,*) 'A TRAJECTORY HAS TO BE TERMINATED.'
nstop=4
return
endif
if ((ldirect*memtime(1).le.ldirect*itime).and. &
(ldirect*memtime(2).gt.ldirect*itime)) then
! The right wind fields are already in memory -> don't do anything
!*****************************************************************
continue
else if ((ldirect*memtime(2).le.ldirect*itime).and. &
(memtime(2).ne.999999999)) then
! Current time is after 2nd wind field
! -> Resort wind field pointers, so that current time is between 1st and 2nd
!***************************************************************************
memaux=memind(1)
memind(1)=memind(2)
memind(2)=memaux
memtime(1)=memtime(2)
! Read a new wind field and store it on place memind(2)
!******************************************************
do indj=indmin,numbwf-1
if (ldirect*wftime(indj+1).gt.ldirect*itime) then
call readwind(indj+1,memind(2),uuh,vvh,wwh)
call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn)
call calcpar(memind(2),uuh,vvh,pvh)
call calcpar_nests(memind(2),uuhn,vvhn,pvhn)
call verttransform(memind(2),uuh,vvh,wwh,pvh)
call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn)
memtime(2)=wftime(indj+1)
nstop = 1
goto 40
endif
end do
40 indmin=indj
else
! No wind fields, which can be used, are currently in memory
! -> read both wind fields
!***********************************************************
do indj=indmin,numbwf-1
if ((ldirect*wftime(indj).le.ldirect*itime).and. &
(ldirect*wftime(indj+1).gt.ldirect*itime)) then
memind(1)=1
call readwind(indj,memind(1),uuh,vvh,wwh)
call readwind_nests(indj,memind(1),uuhn,vvhn,wwhn)
call calcpar(memind(1),uuh,vvh,pvh)
call calcpar_nests(memind(1),uuhn,vvhn,pvhn)
call verttransform(memind(1),uuh,vvh,wwh,pvh)
call verttransform_nests(memind(1),uuhn,vvhn,wwhn,pvhn)
memtime(1)=wftime(indj)
memind(2)=2
call readwind(indj+1,memind(2),uuh,vvh,wwh)
call readwind_nests(indj+1,memind(2),uuhn,vvhn,wwhn)
call calcpar(memind(2),uuh,vvh,pvh)
call calcpar_nests(memind(2),uuhn,vvhn,pvhn)
call verttransform(memind(2),uuh,vvh,wwh,pvh)
call verttransform_nests(memind(2),uuhn,vvhn,wwhn,pvhn)
memtime(2)=wftime(indj+1)
nstop = 1
goto 60
endif
end do
60 indmin=indj
endif
lwindinterv=abs(memtime(2)-memtime(1))
if (lwindinterv.gt.idiffmax) nstop=3
end subroutine getfields
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