calcfluxes.f90 7.18 KB
Newer Older
Matthias Langer's avatar
 
Matthias Langer committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
!**********************************************************************
! 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