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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 releaseparticles(itime)
! o
!*****************************************************************************
! *
! This subroutine releases particles from the release locations. *
! *
! It searches for a "vacant" storage space and assigns all particle *
! information to that space. A space is vacant either when no particle *
! is yet assigned to it, or when it's particle is expired and, thus, *
! the storage space is made available to a new particle. *
! *
! Author: A. Stohl *
! *
! 29 June 2002 *
! *
!*****************************************************************************
! *
! Variables: *
! itime [s] current time *
! ireleasestart, ireleaseend start and end times of all releases *
! npart(maxpoint) number of particles to be released in total *
! numrel number of particles to be released during this time *
! step *
! *
!*****************************************************************************
use point_mod
use xmass_mod
use par_mod
use com_mod
implicit none
!real xaux,yaux,zaux,ran1,rfraction,xmasssave(maxpoint)
real :: xaux,yaux,zaux,ran1,rfraction
real :: topo,rhoaux(2),r,t,rhoout,ddx,ddy,rddx,rddy,p1,p2,p3,p4
real :: dz1,dz2,dz,xtn,ytn,xlonav,timecorrect(maxspec),press,pressold
real :: presspart,average_timecorrect
integer :: itime,numrel,i,j,k,n,ix,jy,ixp,jyp,ipart,minpart,ii
integer :: indz,indzp,kz,ngrid
integer :: nweeks,ndayofweek,nhour,jjjjmmdd,ihmmss,mm
real(kind=dp) :: juldate,julmonday,jul,jullocal,juldiff
real,parameter :: eps=nxmax/3.e5,eps2=1.e-6
integer :: idummy = -7
!save idummy,xmasssave
!data idummy/-7/,xmasssave/maxpoint*0./
! Determine the actual date and time in Greenwich (i.e., UTC + correction for daylight savings time)
!*****************************************************************************
julmonday=juldate(19000101,0) ! this is a Monday
jul=bdate+real(itime,kind=dp)/86400._dp ! this is the current day
call caldate(jul,jjjjmmdd,ihmmss)
mm=(jjjjmmdd-10000*(jjjjmmdd/10000))/100
if ((mm.ge.4).and.(mm.le.9)) jul=jul+1._dp/24._dp ! daylight savings time in summer
! For every release point, check whether we are in the release time interval
!***************************************************************************
minpart=1
do i=1,numpoint
if ((itime.ge.ireleasestart(i)).and. &! are we within release interval?
(itime.le.ireleaseend(i))) then
! Determine the local day and time
!*********************************
xlonav=xlon0+(xpoint2(i)+xpoint1(i))/2.*dx ! longitude needed to determine local time
if (xlonav.lt.-180.) xlonav=xlonav+360.
if (xlonav.gt.180.) xlonav=xlonav-360.
jullocal=jul+real(xlonav,kind=dp)/360._dp ! correct approximately for time zone to obtain local time
juldiff=jullocal-julmonday
nweeks=int(juldiff/7._dp)
juldiff=juldiff-real(nweeks,kind=dp)*7._dp
ndayofweek=int(juldiff)+1 ! this is the current day of week, starting with Monday
nhour=nint((juldiff-real(ndayofweek-1,kind=dp))*24._dp) ! this is the current hour
if (nhour.eq.0) then
nhour=24
ndayofweek=ndayofweek-1
if (ndayofweek.eq.0) ndayofweek=7
endif
! Calculate a species- and time-dependent correction factor, distinguishing between
! area (those with release starting at surface) and point (release starting above surface) sources
! Also, calculate an average time correction factor (species independent)
!*****************************************************************************
average_timecorrect=0.
do k=1,nspec
if (zpoint1(i).gt.0.5) then ! point source
timecorrect(k)=point_hour(k,nhour)*point_dow(k,ndayofweek)
else ! area source
timecorrect(k)=area_hour(k,nhour)*area_dow(k,ndayofweek)
endif
average_timecorrect=average_timecorrect+timecorrect(k)
end do
average_timecorrect=average_timecorrect/real(nspec)
! Determine number of particles to be released this time; at start and at end of release,
! only half the particles are released
!*****************************************************************************
if (ireleasestart(i).ne.ireleaseend(i)) then
rfraction=abs(real(npart(i))*real(lsynctime)/ &
real(ireleaseend(i)-ireleasestart(i)))
if ((itime.eq.ireleasestart(i)).or. &
(itime.eq.ireleaseend(i))) rfraction=rfraction/2.
! Take the species-average time correction factor in order to scale the
! number of particles released this time
!**********************************************************************
rfraction=rfraction*average_timecorrect
rfraction=rfraction+xmasssave(i) ! number to be released at this time
numrel=int(rfraction)
xmasssave(i)=rfraction-real(numrel)
else
numrel=npart(i)
endif
xaux=xpoint2(i)-xpoint1(i)
yaux=ypoint2(i)-ypoint1(i)
zaux=zpoint2(i)-zpoint1(i)
do j=1,numrel ! loop over particles to be released this time
do ipart=minpart,maxpart ! search for free storage space
! If a free storage space is found, attribute everything to this array element
!*****************************************************************************
if (itra1(ipart).ne.itime) then
! Particle coordinates are determined by using a random position within the release volume
!*****************************************************************************
! Determine horizontal particle position
!***************************************
xtra1(ipart)=xpoint1(i)+ran1(idummy)*xaux
if (xglobal) then
if (xtra1(ipart).gt.real(nxmin1)) xtra1(ipart)= &
xtra1(ipart)-real(nxmin1)
if (xtra1(ipart).lt.0.) xtra1(ipart)= &
xtra1(ipart)+real(nxmin1)
endif
ytra1(ipart)=ypoint1(i)+ran1(idummy)*yaux
! Assign mass to particle: Total mass divided by total number of particles.
! Time variation has partly been taken into account already by a species-average
! correction factor, by which the number of particles released this time has been
! scaled. Adjust the mass per particle by the species-dependent time correction factor
! divided by the species-average one
!*****************************************************************************
do k=1,nspec
xmass1(ipart,k)=xmass(i,k)/real(npart(i)) &
*timecorrect(k)/average_timecorrect
! write (*,*) 'xmass1: ',xmass1(ipart,k),ipart,k
! Assign certain properties to particle
!**************************************
end do
nclass(ipart)=min(int(ran1(idummy)*real(nclassunc))+1, &
nclassunc)
numparticlecount=numparticlecount+1
if (mquasilag.eq.0) then
npoint(ipart)=i
else
npoint(ipart)=numparticlecount
endif
idt(ipart)=mintime ! first time step
itra1(ipart)=itime
itramem(ipart)=itra1(ipart)
itrasplit(ipart)=itra1(ipart)+ldirect*itsplit
! Determine vertical particle position
!*************************************
ztra1(ipart)=zpoint1(i)+ran1(idummy)*zaux
! Interpolation of topography and density
!****************************************
! Determine the nest we are in
!*****************************
ngrid=0
do k=numbnests,1,-1
if ((xtra1(ipart).gt.xln(k)+eps).and. &
(xtra1(ipart).lt.xrn(k)-eps).and. &
(ytra1(ipart).gt.yln(k)+eps).and. &
(ytra1(ipart).lt.yrn(k)-eps)) then
ngrid=k
goto 43
endif
end do
43 continue
! Determine (nested) grid coordinates and auxiliary parameters used for interpolation
!*****************************************************************************
if (ngrid.gt.0) then
xtn=(xtra1(ipart)-xln(ngrid))*xresoln(ngrid)
ytn=(ytra1(ipart)-yln(ngrid))*yresoln(ngrid)
ix=int(xtn)
jy=int(ytn)
ddy=ytn-real(jy)
ddx=xtn-real(ix)
else
ix=int(xtra1(ipart))
jy=int(ytra1(ipart))
ddy=ytra1(ipart)-real(jy)
ddx=xtra1(ipart)-real(ix)
endif
ixp=ix+1
jyp=jy+1
rddx=1.-ddx
rddy=1.-ddy
p1=rddx*rddy
p2=ddx*rddy
p3=rddx*ddy
p4=ddx*ddy
if (ngrid.gt.0) then
topo=p1*oron(ix ,jy ,ngrid) &
+ p2*oron(ixp,jy ,ngrid) &
+ p3*oron(ix ,jyp,ngrid) &
+ p4*oron(ixp,jyp,ngrid)
else
topo=p1*oro(ix ,jy) &
+ p2*oro(ixp,jy) &
+ p3*oro(ix ,jyp) &
+ p4*oro(ixp,jyp)
endif
! If starting height is in pressure coordinates, retrieve pressure profile and convert zpart1 to meters
!*****************************************************************************
if (kindz(i).eq.3) then
presspart=ztra1(ipart)
do kz=1,nz
if (ngrid.gt.0) then
r=p1*rhon(ix ,jy ,kz,2,ngrid) &
+p2*rhon(ixp,jy ,kz,2,ngrid) &
+p3*rhon(ix ,jyp,kz,2,ngrid) &
+p4*rhon(ixp,jyp,kz,2,ngrid)
t=p1*ttn(ix ,jy ,kz,2,ngrid) &
+p2*ttn(ixp,jy ,kz,2,ngrid) &
+p3*ttn(ix ,jyp,kz,2,ngrid) &
+p4*ttn(ixp,jyp,kz,2,ngrid)
else
r=p1*rho(ix ,jy ,kz,2) &
+p2*rho(ixp,jy ,kz,2) &
+p3*rho(ix ,jyp,kz,2) &
+p4*rho(ixp,jyp,kz,2)
t=p1*tt(ix ,jy ,kz,2) &
+p2*tt(ixp,jy ,kz,2) &
+p3*tt(ix ,jyp,kz,2) &
+p4*tt(ixp,jyp,kz,2)
endif
press=r*r_air*t/100.
if (kz.eq.1) pressold=press
if (press.lt.presspart) then
if (kz.eq.1) then
ztra1(ipart)=height(1)/2.
else
dz1=pressold-presspart
dz2=presspart-press
ztra1(ipart)=(height(kz-1)*dz2+height(kz)*dz1) &
/(dz1+dz2)
endif
goto 71
endif
pressold=press
end do
71 continue
endif
! If release positions are given in meters above sea level, subtract the
! topography from the starting height
!***********************************************************************
if (kindz(i).eq.2) ztra1(ipart)=ztra1(ipart)-topo
if (ztra1(ipart).lt.eps2) ztra1(ipart)=eps2 ! Minimum starting height is eps2
if (ztra1(ipart).gt.height(nz)-0.5) ztra1(ipart)= &
height(nz)-0.5 ! Maximum starting height is uppermost level - 0.5 meters
! For special simulations, multiply particle concentration air density;
! Simply take the 2nd field in memory to do this (accurate enough)
!***********************************************************************
!AF IND_SOURCE switches between different units for concentrations at the source
!Af NOTE that in backward simulations the release of particles takes place at the
!Af receptor and the sampling at the source.
!Af 1="mass"
!Af 2="mass mixing ratio"
!Af IND_RECEPTOR switches between different units for concentrations at the receptor
!Af 1="mass"
!Af 2="mass mixing ratio"
!Af switches for the releasefile:
!Af IND_REL = 1 : xmass * rho
!Af IND_REL = 0 : xmass * 1
!Af ind_rel is defined in readcommand.f
if (ind_rel .eq. 1) then
! Interpolate the air density
!****************************
do ii=2,nz
if (height(ii).gt.ztra1(ipart)) then
indz=ii-1
indzp=ii
goto 6
endif
end do
6 continue
dz1=ztra1(ipart)-height(indz)
dz2=height(indzp)-ztra1(ipart)
dz=1./(dz1+dz2)
if (ngrid.gt.0) then
do n=1,2
rhoaux(n)=p1*rhon(ix ,jy ,indz+n-1,2,ngrid) &
+p2*rhon(ixp,jy ,indz+n-1,2,ngrid) &
+p3*rhon(ix ,jyp,indz+n-1,2,ngrid) &
+p4*rhon(ixp,jyp,indz+n-1,2,ngrid)
end do
else
do n=1,2
rhoaux(n)=p1*rho(ix ,jy ,indz+n-1,2) &
+p2*rho(ixp,jy ,indz+n-1,2) &
+p3*rho(ix ,jyp,indz+n-1,2) &
+p4*rho(ixp,jyp,indz+n-1,2)
end do
endif
rhoout=(dz2*rhoaux(1)+dz1*rhoaux(2))*dz
rho_rel(i)=rhoout
! Multiply "mass" (i.e., mass mixing ratio in forward runs) with density
!********************************************************************
do k=1,nspec
xmass1(ipart,k)=xmass1(ipart,k)*rhoout
end do
endif
numpart=max(numpart,ipart)
goto 34 ! Storage space has been found, stop searching
endif
end do
if (ipart.gt.maxpart) goto 996
34 minpart=ipart+1
end do
endif
end do
return
996 continue
write(*,*) '#####################################################'
write(*,*) '#### FLEXPART MODEL SUBROUTINE RELEASEPARTICLES: ####'
write(*,*) '#### ####'
write(*,*) '#### ERROR - TOTAL NUMBER OF PARTICLES REQUIRED ####'
write(*,*) '#### EXCEEDS THE MAXIMUM ALLOWED NUMBER. REDUCE ####'
write(*,*) '#### EITHER NUMBER OF PARTICLES PER RELEASE POINT####'
write(*,*) '#### OR REDUCE NUMBER OF RELEASE POINTS. ####'
write(*,*) '#####################################################'
stop
end subroutine releaseparticles
|
