| 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 releaseparticles(itime) |
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| 23 | ! o |
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| 24 | !***************************************************************************** |
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| 25 | ! * |
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| 26 | ! This subroutine releases particles from the release locations. * |
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| 27 | ! * |
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| 28 | ! It searches for a "vacant" storage space and assigns all particle * |
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| 29 | ! information to that space. A space is vacant either when no particle * |
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| 30 | ! is yet assigned to it, or when it's particle is expired and, thus, * |
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| 31 | ! the storage space is made available to a new particle. * |
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| 32 | ! * |
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| 33 | ! Author: A. Stohl * |
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| 34 | ! * |
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| 35 | ! 29 June 2002 * |
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| 36 | ! * |
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| 37 | !***************************************************************************** |
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| 38 | ! * |
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| 39 | ! Variables: * |
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| 40 | ! itime [s] current time * |
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| 41 | ! ireleasestart, ireleaseend start and end times of all releases * |
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| 42 | ! npart(maxpoint) number of particles to be released in total * |
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| 43 | ! numrel number of particles to be released during this time * |
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| 44 | ! step * |
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| 45 | ! * |
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| 46 | !***************************************************************************** |
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| 47 | |
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| 48 | use point_mod |
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| 49 | use xmass_mod |
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| 50 | use par_mod |
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| 51 | use com_mod |
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| 52 | |
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| 53 | implicit none |
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| 54 | |
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| 55 | !real xaux,yaux,zaux,ran1,rfraction,xmasssave(maxpoint) |
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| 56 | real :: xaux,yaux,zaux,ran1,rfraction |
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| 57 | real :: topo,rhoaux(2),r,t,rhoout,ddx,ddy,rddx,rddy,p1,p2,p3,p4 |
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| 58 | real :: dz1,dz2,dz,xtn,ytn,xlonav,timecorrect(maxspec),press,pressold |
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| 59 | real :: presspart,average_timecorrect |
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| 60 | integer :: itime,numrel,i,j,k,n,ix,jy,ixp,jyp,ipart,minpart,ii |
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| 61 | integer :: indz,indzp,kz,ngrid |
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| 62 | integer :: nweeks,ndayofweek,nhour,jjjjmmdd,ihmmss,mm |
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| 63 | real(kind=dp) :: juldate,julmonday,jul,jullocal,juldiff |
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| 64 | real,parameter :: eps=nxmax/3.e5,eps2=1.e-6 |
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| 65 | |
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| 66 | integer :: idummy = -7 |
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| 67 | !save idummy,xmasssave |
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| 68 | !data idummy/-7/,xmasssave/maxpoint*0./ |
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| 69 | |
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| 70 | |
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| 71 | ! Determine the actual date and time in Greenwich (i.e., UTC + correction for daylight savings time) |
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| 72 | !***************************************************************************** |
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| 73 | |
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| 74 | julmonday=juldate(19000101,0) ! this is a Monday |
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| 75 | jul=bdate+real(itime,kind=dp)/86400._dp ! this is the current day |
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| 76 | call caldate(jul,jjjjmmdd,ihmmss) |
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| 77 | mm=(jjjjmmdd-10000*(jjjjmmdd/10000))/100 |
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| 78 | if ((mm.ge.4).and.(mm.le.9)) jul=jul+1._dp/24._dp ! daylight savings time in summer |
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| 79 | |
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| 80 | |
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| 81 | ! For every release point, check whether we are in the release time interval |
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| 82 | !*************************************************************************** |
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| 83 | |
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| 84 | minpart=1 |
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| 85 | do i=1,numpoint |
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| 86 | if ((itime.ge.ireleasestart(i)).and. &! are we within release interval? |
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| 87 | (itime.le.ireleaseend(i))) then |
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| 88 | |
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| 89 | ! Determine the local day and time |
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| 90 | !********************************* |
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| 91 | |
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| 92 | xlonav=xlon0+(xpoint2(i)+xpoint1(i))/2.*dx ! longitude needed to determine local time |
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| 93 | if (xlonav.lt.-180.) xlonav=xlonav+360. |
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| 94 | if (xlonav.gt.180.) xlonav=xlonav-360. |
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| 95 | jullocal=jul+real(xlonav,kind=dp)/360._dp ! correct approximately for time zone to obtain local time |
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| 96 | |
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| 97 | juldiff=jullocal-julmonday |
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| 98 | nweeks=int(juldiff/7._dp) |
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| 99 | juldiff=juldiff-real(nweeks,kind=dp)*7._dp |
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| 100 | ndayofweek=int(juldiff)+1 ! this is the current day of week, starting with Monday |
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| 101 | nhour=nint((juldiff-real(ndayofweek-1,kind=dp))*24._dp) ! this is the current hour |
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| 102 | if (nhour.eq.0) then |
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| 103 | nhour=24 |
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| 104 | ndayofweek=ndayofweek-1 |
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| 105 | if (ndayofweek.eq.0) ndayofweek=7 |
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| 106 | endif |
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| 107 | |
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| 108 | ! Calculate a species- and time-dependent correction factor, distinguishing between |
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| 109 | ! area (those with release starting at surface) and point (release starting above surface) sources |
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| 110 | ! Also, calculate an average time correction factor (species independent) |
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| 111 | !***************************************************************************** |
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| 112 | average_timecorrect=0. |
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| 113 | do k=1,nspec |
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| 114 | if (zpoint1(i).gt.0.5) then ! point source |
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| 115 | timecorrect(k)=point_hour(k,nhour)*point_dow(k,ndayofweek) |
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| 116 | else ! area source |
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| 117 | timecorrect(k)=area_hour(k,nhour)*area_dow(k,ndayofweek) |
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| 118 | endif |
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| 119 | average_timecorrect=average_timecorrect+timecorrect(k) |
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| 120 | end do |
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| 121 | average_timecorrect=average_timecorrect/real(nspec) |
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| 122 | |
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| 123 | ! Determine number of particles to be released this time; at start and at end of release, |
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| 124 | ! only half the particles are released |
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| 125 | !***************************************************************************** |
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| 126 | |
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| 127 | if (ireleasestart(i).ne.ireleaseend(i)) then |
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| 128 | rfraction=abs(real(npart(i))*real(lsynctime)/ & |
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| 129 | real(ireleaseend(i)-ireleasestart(i))) |
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| 130 | if ((itime.eq.ireleasestart(i)).or. & |
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| 131 | (itime.eq.ireleaseend(i))) rfraction=rfraction/2. |
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| 132 | |
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| 133 | ! Take the species-average time correction factor in order to scale the |
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| 134 | ! number of particles released this time |
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| 135 | !********************************************************************** |
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| 136 | rfraction=rfraction*average_timecorrect |
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| 137 | |
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| 138 | rfraction=rfraction+xmasssave(i) ! number to be released at this time |
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| 139 | numrel=int(rfraction) |
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| 140 | xmasssave(i)=rfraction-real(numrel) |
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| 141 | else |
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| 142 | numrel=npart(i) |
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| 143 | endif |
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| 144 | |
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| 145 | xaux=xpoint2(i)-xpoint1(i) |
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| 146 | yaux=ypoint2(i)-ypoint1(i) |
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| 147 | zaux=zpoint2(i)-zpoint1(i) |
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| 148 | do j=1,numrel ! loop over particles to be released this time |
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| 149 | do ipart=minpart,maxpart ! search for free storage space |
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| 150 | |
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| 151 | ! If a free storage space is found, attribute everything to this array element |
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| 152 | !***************************************************************************** |
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| 153 | |
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| 154 | if (itra1(ipart).ne.itime) then |
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| 155 | |
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| 156 | ! Particle coordinates are determined by using a random position within the release volume |
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| 157 | !***************************************************************************** |
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| 158 | |
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| 159 | ! Determine horizontal particle position |
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| 160 | !*************************************** |
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| 161 | |
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| 162 | xtra1(ipart)=xpoint1(i)+ran1(idummy)*xaux |
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| 163 | if (xglobal) then |
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| 164 | if (xtra1(ipart).gt.real(nxmin1)) xtra1(ipart)= & |
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| 165 | xtra1(ipart)-real(nxmin1) |
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| 166 | if (xtra1(ipart).lt.0.) xtra1(ipart)= & |
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| 167 | xtra1(ipart)+real(nxmin1) |
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| 168 | endif |
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| 169 | ytra1(ipart)=ypoint1(i)+ran1(idummy)*yaux |
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| 170 | |
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| 171 | ! Assign mass to particle: Total mass divided by total number of particles. |
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| 172 | ! Time variation has partly been taken into account already by a species-average |
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| 173 | ! correction factor, by which the number of particles released this time has been |
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| 174 | ! scaled. Adjust the mass per particle by the species-dependent time correction factor |
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| 175 | ! divided by the species-average one |
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| 176 | !***************************************************************************** |
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| 177 | do k=1,nspec |
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| 178 | xmass1(ipart,k)=xmass(i,k)/real(npart(i)) & |
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| 179 | *timecorrect(k)/average_timecorrect |
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| 180 | ! write (*,*) 'xmass1: ',xmass1(ipart,k),ipart,k |
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| 181 | ! Assign certain properties to particle |
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| 182 | !************************************** |
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| 183 | end do |
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| 184 | nclass(ipart)=min(int(ran1(idummy)*real(nclassunc))+1, & |
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| 185 | nclassunc) |
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| 186 | numparticlecount=numparticlecount+1 |
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| 187 | if (mquasilag.eq.0) then |
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| 188 | npoint(ipart)=i |
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| 189 | else |
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| 190 | npoint(ipart)=numparticlecount |
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| 191 | endif |
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| 192 | idt(ipart)=mintime ! first time step |
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| 193 | itra1(ipart)=itime |
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| 194 | itramem(ipart)=itra1(ipart) |
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| 195 | itrasplit(ipart)=itra1(ipart)+ldirect*itsplit |
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| 196 | |
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| 197 | |
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| 198 | ! Determine vertical particle position |
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| 199 | !************************************* |
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| 200 | |
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| 201 | ztra1(ipart)=zpoint1(i)+ran1(idummy)*zaux |
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| 202 | |
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| 203 | ! Interpolation of topography and density |
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| 204 | !**************************************** |
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| 205 | |
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| 206 | ! Determine the nest we are in |
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| 207 | !***************************** |
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| 208 | |
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| 209 | ngrid=0 |
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| 210 | do k=numbnests,1,-1 |
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| 211 | if ((xtra1(ipart).gt.xln(k)+eps).and. & |
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| 212 | (xtra1(ipart).lt.xrn(k)-eps).and. & |
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| 213 | (ytra1(ipart).gt.yln(k)+eps).and. & |
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| 214 | (ytra1(ipart).lt.yrn(k)-eps)) then |
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| 215 | ngrid=k |
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| 216 | goto 43 |
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| 217 | endif |
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| 218 | end do |
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| 219 | 43 continue |
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| 220 | |
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| 221 | ! Determine (nested) grid coordinates and auxiliary parameters used for interpolation |
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| 222 | !***************************************************************************** |
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| 223 | |
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| 224 | if (ngrid.gt.0) then |
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| 225 | xtn=(xtra1(ipart)-xln(ngrid))*xresoln(ngrid) |
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| 226 | ytn=(ytra1(ipart)-yln(ngrid))*yresoln(ngrid) |
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| 227 | ix=int(xtn) |
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| 228 | jy=int(ytn) |
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| 229 | ddy=ytn-real(jy) |
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| 230 | ddx=xtn-real(ix) |
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| 231 | else |
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| 232 | ix=int(xtra1(ipart)) |
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| 233 | jy=int(ytra1(ipart)) |
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| 234 | ddy=ytra1(ipart)-real(jy) |
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| 235 | ddx=xtra1(ipart)-real(ix) |
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| 236 | endif |
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| 237 | ixp=ix+1 |
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| 238 | jyp=jy+1 |
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| 239 | rddx=1.-ddx |
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| 240 | rddy=1.-ddy |
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| 241 | p1=rddx*rddy |
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| 242 | p2=ddx*rddy |
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| 243 | p3=rddx*ddy |
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| 244 | p4=ddx*ddy |
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| 245 | |
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| 246 | if (ngrid.gt.0) then |
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| 247 | topo=p1*oron(ix ,jy ,ngrid) & |
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| 248 | + p2*oron(ixp,jy ,ngrid) & |
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| 249 | + p3*oron(ix ,jyp,ngrid) & |
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| 250 | + p4*oron(ixp,jyp,ngrid) |
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| 251 | else |
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| 252 | topo=p1*oro(ix ,jy) & |
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| 253 | + p2*oro(ixp,jy) & |
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| 254 | + p3*oro(ix ,jyp) & |
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| 255 | + p4*oro(ixp,jyp) |
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| 256 | endif |
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| 257 | |
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| 258 | ! If starting height is in pressure coordinates, retrieve pressure profile and convert zpart1 to meters |
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| 259 | !***************************************************************************** |
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| 260 | if (kindz(i).eq.3) then |
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| 261 | presspart=ztra1(ipart) |
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| 262 | do kz=1,nz |
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| 263 | if (ngrid.gt.0) then |
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| 264 | r=p1*rhon(ix ,jy ,kz,2,ngrid) & |
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| 265 | +p2*rhon(ixp,jy ,kz,2,ngrid) & |
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| 266 | +p3*rhon(ix ,jyp,kz,2,ngrid) & |
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| 267 | +p4*rhon(ixp,jyp,kz,2,ngrid) |
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| 268 | t=p1*ttn(ix ,jy ,kz,2,ngrid) & |
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| 269 | +p2*ttn(ixp,jy ,kz,2,ngrid) & |
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| 270 | +p3*ttn(ix ,jyp,kz,2,ngrid) & |
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| 271 | +p4*ttn(ixp,jyp,kz,2,ngrid) |
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| 272 | else |
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| 273 | r=p1*rho(ix ,jy ,kz,2) & |
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| 274 | +p2*rho(ixp,jy ,kz,2) & |
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| 275 | +p3*rho(ix ,jyp,kz,2) & |
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| 276 | +p4*rho(ixp,jyp,kz,2) |
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| 277 | t=p1*tt(ix ,jy ,kz,2) & |
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| 278 | +p2*tt(ixp,jy ,kz,2) & |
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| 279 | +p3*tt(ix ,jyp,kz,2) & |
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| 280 | +p4*tt(ixp,jyp,kz,2) |
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| 281 | endif |
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| 282 | press=r*r_air*t/100. |
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| 283 | if (kz.eq.1) pressold=press |
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| 284 | |
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| 285 | if (press.lt.presspart) then |
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| 286 | if (kz.eq.1) then |
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| 287 | ztra1(ipart)=height(1)/2. |
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| 288 | else |
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| 289 | dz1=pressold-presspart |
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| 290 | dz2=presspart-press |
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| 291 | ztra1(ipart)=(height(kz-1)*dz2+height(kz)*dz1) & |
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| 292 | /(dz1+dz2) |
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| 293 | endif |
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| 294 | goto 71 |
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| 295 | endif |
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| 296 | pressold=press |
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| 297 | end do |
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| 298 | 71 continue |
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| 299 | endif |
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| 300 | |
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| 301 | ! If release positions are given in meters above sea level, subtract the |
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| 302 | ! topography from the starting height |
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| 303 | !*********************************************************************** |
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| 304 | |
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| 305 | if (kindz(i).eq.2) ztra1(ipart)=ztra1(ipart)-topo |
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| 306 | if (ztra1(ipart).lt.eps2) ztra1(ipart)=eps2 ! Minimum starting height is eps2 |
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| 307 | if (ztra1(ipart).gt.height(nz)-0.5) ztra1(ipart)= & |
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| 308 | height(nz)-0.5 ! Maximum starting height is uppermost level - 0.5 meters |
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| 309 | |
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| 310 | |
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| 311 | |
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| 312 | ! For special simulations, multiply particle concentration air density; |
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| 313 | ! Simply take the 2nd field in memory to do this (accurate enough) |
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| 314 | !*********************************************************************** |
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| 315 | !AF IND_SOURCE switches between different units for concentrations at the source |
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| 316 | !Af NOTE that in backward simulations the release of particles takes place at the |
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| 317 | !Af receptor and the sampling at the source. |
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| 318 | !Af 1="mass" |
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| 319 | !Af 2="mass mixing ratio" |
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| 320 | !Af IND_RECEPTOR switches between different units for concentrations at the receptor |
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| 321 | !Af 1="mass" |
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| 322 | !Af 2="mass mixing ratio" |
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| 323 | |
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| 324 | !Af switches for the releasefile: |
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| 325 | !Af IND_REL = 1 : xmass * rho |
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| 326 | !Af IND_REL = 0 : xmass * 1 |
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| 327 | |
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| 328 | !Af ind_rel is defined in readcommand.f |
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| 329 | |
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| 330 | if (ind_rel .eq. 1) then |
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| 331 | |
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| 332 | ! Interpolate the air density |
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| 333 | !**************************** |
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| 334 | |
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| 335 | do ii=2,nz |
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| 336 | if (height(ii).gt.ztra1(ipart)) then |
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| 337 | indz=ii-1 |
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| 338 | indzp=ii |
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| 339 | goto 6 |
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| 340 | endif |
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| 341 | end do |
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| 342 | 6 continue |
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| 343 | |
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| 344 | dz1=ztra1(ipart)-height(indz) |
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| 345 | dz2=height(indzp)-ztra1(ipart) |
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| 346 | dz=1./(dz1+dz2) |
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| 347 | |
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| 348 | if (ngrid.gt.0) then |
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| 349 | do n=1,2 |
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| 350 | rhoaux(n)=p1*rhon(ix ,jy ,indz+n-1,2,ngrid) & |
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| 351 | +p2*rhon(ixp,jy ,indz+n-1,2,ngrid) & |
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| 352 | +p3*rhon(ix ,jyp,indz+n-1,2,ngrid) & |
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| 353 | +p4*rhon(ixp,jyp,indz+n-1,2,ngrid) |
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| 354 | end do |
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| 355 | else |
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| 356 | do n=1,2 |
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| 357 | rhoaux(n)=p1*rho(ix ,jy ,indz+n-1,2) & |
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| 358 | +p2*rho(ixp,jy ,indz+n-1,2) & |
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| 359 | +p3*rho(ix ,jyp,indz+n-1,2) & |
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| 360 | +p4*rho(ixp,jyp,indz+n-1,2) |
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| 361 | end do |
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| 362 | endif |
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| 363 | rhoout=(dz2*rhoaux(1)+dz1*rhoaux(2))*dz |
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| 364 | rho_rel(i)=rhoout |
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| 365 | |
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| 366 | |
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| 367 | ! Multiply "mass" (i.e., mass mixing ratio in forward runs) with density |
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| 368 | !******************************************************************** |
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| 369 | |
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| 370 | do k=1,nspec |
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| 371 | xmass1(ipart,k)=xmass1(ipart,k)*rhoout |
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| 372 | end do |
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| 373 | endif |
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| 374 | |
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| 375 | |
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| 376 | numpart=max(numpart,ipart) |
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| 377 | goto 34 ! Storage space has been found, stop searching |
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| 378 | endif |
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| 379 | end do |
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| 380 | if (ipart.gt.maxpart) goto 996 |
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| 381 | |
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| 382 | 34 minpart=ipart+1 |
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| 383 | end do |
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| 384 | endif |
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| 385 | end do |
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| 386 | |
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| 387 | |
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| 388 | return |
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| 389 | |
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| 390 | 996 continue |
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| 391 | write(*,*) '#####################################################' |
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| 392 | write(*,*) '#### FLEXPART MODEL SUBROUTINE RELEASEPARTICLES: ####' |
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| 393 | write(*,*) '#### ####' |
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| 394 | write(*,*) '#### ERROR - TOTAL NUMBER OF PARTICLES REQUIRED ####' |
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| 395 | write(*,*) '#### EXCEEDS THE MAXIMUM ALLOWED NUMBER. REDUCE ####' |
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| 396 | write(*,*) '#### EITHER NUMBER OF PARTICLES PER RELEASE POINT####' |
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| 397 | write(*,*) '#### OR REDUCE NUMBER OF RELEASE POINTS. ####' |
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| 398 | write(*,*) '#####################################################' |
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| 399 | stop |
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| 400 | |
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| 401 | end subroutine releaseparticles |
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