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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 calcfluxes(nage,jpart,xold,yold,zold)
! i i i i i
!*****************************************************************************
! *
! Calculation of the gross fluxes across horizontal, eastward and *
! northward facing surfaces. The routine calculates the mass flux *
! due to the motion of only one particle. The fluxes of subsequent calls *
! to this subroutine are accumulated until the next output is due. *
! Upon output, flux fields are re-set to zero in subroutine fluxoutput.f.*
! *
! Author: A. Stohl *
! *
! 04 April 2000 *
! *
!*****************************************************************************
! *
! Variables: *
! *
! nage Age class of the particle considered *
! jpart Index of the particle considered *
! xold,yold,zold "Memorized" old positions of the particle *
! *
!*****************************************************************************
use flux_mod
use outg_mod
use par_mod
use com_mod
implicit none
integer :: jpart,nage,ixave,jyave,kz,kzave,kp
integer :: k,k1,k2,ix,ix1,ix2,ixs,jy,jy1,jy2
real :: xold,yold,zold,xmean,ymean
! Determine average positions
!****************************
if ((ioutputforeachrelease.eq.1).and.(mdomainfill.eq.0)) then
kp=npoint(jpart)
else
kp=1
endif
xmean=(xold+xtra1(jpart))/2.
ymean=(yold+ytra1(jpart))/2.
ixave=int((xmean*dx+xoutshift)/dxout)
jyave=int((ymean*dy+youtshift)/dyout)
do kz=1,numzgrid ! determine height of cell
if (outheight(kz).gt.ztra1(jpart)) goto 16
end do
16 kzave=kz
! Determine vertical fluxes
!**************************
if ((ixave.ge.0).and.(jyave.ge.0).and.(ixave.le.numxgrid-1).and. &
(jyave.le.numygrid-1)) then
do kz=1,numzgrid ! determine height of cell
if (outheighthalf(kz).gt.zold) goto 11
end do
11 k1=min(numzgrid,kz)
do kz=1,numzgrid ! determine height of cell
if (outheighthalf(kz).gt.ztra1(jpart)) goto 21
end do
21 k2=min(numzgrid,kz)
do k=1,nspec
do kz=k1,k2-1
flux(5,ixave,jyave,kz,k,kp,nage)= &
flux(5,ixave,jyave,kz,k,kp,nage)+ &
xmass1(jpart,k)
end do
do kz=k2,k1-1
flux(6,ixave,jyave,kz,k,kp,nage)= &
flux(6,ixave,jyave,kz,k,kp,nage)+ &
xmass1(jpart,k)
end do
end do
endif
! Determine west-east fluxes (fluxw) and east-west fluxes (fluxe)
!****************************************************************
if ((kzave.le.numzgrid).and.(jyave.ge.0).and. &
(jyave.le.numygrid-1)) then
! 1) Particle does not cross domain boundary
if (abs(xold-xtra1(jpart)).lt.real(nx)/2.) then
ix1=int((xold*dx+xoutshift)/dxout+0.5)
ix2=int((xtra1(jpart)*dx+xoutshift)/dxout+0.5)
do k=1,nspec
do ix=ix1,ix2-1
if ((ix.ge.0).and.(ix.le.numxgrid-1)) then
flux(1,ix,jyave,kzave,k,kp,nage)= &
flux(1,ix,jyave,kzave,k,kp,nage) &
+xmass1(jpart,k)
endif
end do
do ix=ix2,ix1-1
if ((ix.ge.0).and.(ix.le.numxgrid-1)) then
flux(2,ix,jyave,kzave,k,kp,nage)= &
flux(2,ix,jyave,kzave,k,kp,nage) &
+xmass1(jpart,k)
endif
end do
end do
! 2) Particle crosses domain boundary: use cyclic boundary condition
! and attribute flux to easternmost grid row only (approximation valid
! for relatively slow motions compared to output grid cell size)
else
ixs=int(((real(nxmin1)-1.e5)*dx+xoutshift)/dxout)
if ((ixs.ge.0).and.(ixs.le.numxgrid-1)) then
if (xold.gt.xtra1(jpart)) then ! west-east flux
do k=1,nspec
flux(1,ixs,jyave,kzave,k,kp,nage)= &
flux(1,ixs,jyave,kzave,k,kp,nage) &
+xmass1(jpart,k)
end do
else ! east-west flux
do k=1,nspec
flux(2,ixs,jyave,kzave,k,kp,nage)= &
flux(2,ixs,jyave,kzave,k,kp,nage) &
+xmass1(jpart,k)
end do
endif
endif
endif
endif
! Determine south-north fluxes (fluxs) and north-south fluxes (fluxn)
!********************************************************************
if ((kzave.le.numzgrid).and.(ixave.ge.0).and. &
(ixave.le.numxgrid-1)) then
jy1=int((yold*dy+youtshift)/dyout+0.5)
jy2=int((ytra1(jpart)*dy+youtshift)/dyout+0.5)
do k=1,nspec
do jy=jy1,jy2-1
if ((jy.ge.0).and.(jy.le.numygrid-1)) then
flux(3,ixave,jy,kzave,k,kp,nage)= &
flux(3,ixave,jy,kzave,k,kp,nage) &
+xmass1(jpart,k)
endif
end do
do jy=jy2,jy1-1
if ((jy.ge.0).and.(jy.le.numygrid-1)) then
flux(4,ixave,jy,kzave,k,kp,nage)= &
flux(4,ixave,jy,kzave,k,kp,nage) &
+xmass1(jpart,k)
endif
end do
end do
endif
end subroutine calcfluxes
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