| 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 advance(itime,nrelpoint,ldt,up,vp,wp, & |
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| 23 | usigold,vsigold,wsigold,nstop,xt,yt,zt,prob,icbt) |
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| 24 | ! i i i/oi/oi/o |
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| 25 | ! i/o i/o i/o o i/oi/oi/o i/o i/o |
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| 26 | !***************************************************************************** |
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| 27 | ! * |
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| 28 | ! Calculation of turbulent particle trajectories utilizing a * |
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| 29 | ! zero-acceleration scheme, which is corrected by a numerically more * |
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| 30 | ! accurate Petterssen scheme whenever possible. * |
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| 31 | ! * |
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| 32 | ! Particle positions are read in, incremented, and returned to the calling * |
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| 33 | ! program. * |
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| 34 | ! * |
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| 35 | ! In different regions of the atmosphere (PBL vs. free troposphere), * |
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| 36 | ! different parameters are needed for advection, parameterizing turbulent * |
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| 37 | ! velocities, etc. For efficiency, different interpolation routines have * |
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| 38 | ! been written for these different cases, with the disadvantage that there * |
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| 39 | ! exist several routines doing almost the same. They all share the * |
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| 40 | ! included file 'interpol_mod'. The following * |
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| 41 | ! interpolation routines are used: * |
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| 42 | ! * |
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| 43 | ! interpol_all(_nests) interpolates everything (called inside the PBL) * |
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| 44 | ! interpol_misslev(_nests) if a particle moves vertically in the PBL, * |
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| 45 | ! additional parameters are interpolated if it * |
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| 46 | ! crosses a model level * |
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| 47 | ! interpol_wind(_nests) interpolates the wind and determines the * |
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| 48 | ! standard deviation of the wind (called outside * |
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| 49 | ! PBL) also interpolates potential vorticity * |
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| 50 | ! interpol_wind_short(_nests) only interpolates the wind (needed for the * |
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| 51 | ! Petterssen scheme) * |
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| 52 | ! interpol_vdep(_nests) interpolates deposition velocities * |
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| 53 | ! * |
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| 54 | ! * |
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| 55 | ! Author: A. Stohl * |
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| 56 | ! * |
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| 57 | ! 16 December 1997 * |
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| 58 | ! * |
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| 59 | ! Changes: * |
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| 60 | ! * |
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| 61 | ! 8 April 2000: Deep convection parameterization * |
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| 62 | ! * |
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| 63 | ! May 2002: Petterssen scheme introduced * |
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| 64 | ! * |
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| 65 | !***************************************************************************** |
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| 66 | ! * |
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| 67 | ! Variables: * |
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| 68 | ! icbt 1 if particle not transferred to forbidden state, * |
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| 69 | ! else -1 * |
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| 70 | ! dawsave accumulated displacement in along-wind direction * |
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| 71 | ! dcwsave accumulated displacement in cross-wind direction * |
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| 72 | ! dxsave accumulated displacement in longitude * |
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| 73 | ! dysave accumulated displacement in latitude * |
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| 74 | ! h [m] Mixing height * |
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| 75 | ! lwindinterv [s] time interval between two wind fields * |
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| 76 | ! itime [s] time at which this subroutine is entered * |
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| 77 | ! itimec [s] actual time, which is incremented in this subroutine * |
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| 78 | ! href [m] height for which dry deposition velocity is calculated * |
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| 79 | ! ladvance [s] Total integration time period * |
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| 80 | ! ldirect 1 forward, -1 backward * |
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| 81 | ! ldt [s] Time step for the next integration * |
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| 82 | ! lsynctime [s] Synchronisation interval of FLEXPART * |
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| 83 | ! ngrid index which grid is to be used * |
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| 84 | ! nrand index for a variable to be picked from rannumb * |
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| 85 | ! nstop if > 1 particle has left domain and must be stopped * |
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| 86 | ! prob probability of absorption due to dry deposition * |
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| 87 | ! rannumb(maxrand) normally distributed random variables * |
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| 88 | ! rhoa air density * |
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| 89 | ! rhograd vertical gradient of the air density * |
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| 90 | ! up,vp,wp random velocities due to turbulence (along wind, cross * |
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| 91 | ! wind, vertical wind * |
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| 92 | ! usig,vsig,wsig mesoscale wind fluctuations * |
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| 93 | ! usigold,vsigold,wsigold like usig, etc., but for the last time step * |
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| 94 | ! vdepo Deposition velocities for all species * |
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| 95 | ! xt,yt,zt Particle position * |
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| 96 | ! * |
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| 97 | !***************************************************************************** |
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| 98 | |
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| 99 | use point_mod |
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| 100 | use par_mod |
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| 101 | use com_mod |
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| 102 | use interpol_mod |
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| 103 | use hanna_mod |
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| 104 | use cmapf_mod |
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| 105 | use random_mod, only: ran3 |
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| 106 | |
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| 107 | implicit none |
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| 108 | |
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| 109 | real(kind=dp) :: xt,yt |
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| 110 | real :: zt,xts,yts,weight |
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| 111 | integer :: itime,itimec,nstop,ldt,i,j,k,nrand,loop,memindnext,mind |
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| 112 | integer :: ngr,nix,njy,ks,nsp,nrelpoint |
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| 113 | real :: dz,dz1,dz2,xlon,ylat,xpol,ypol,gridsize |
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| 114 | real :: ru,rv,rw,dt,ux,vy,cosfact,xtn,ytn,tropop |
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| 115 | real :: prob(maxspec),up,vp,wp,dxsave,dysave,dawsave |
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| 116 | real :: dcwsave |
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| 117 | real :: usigold,vsigold,wsigold,r,rs |
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| 118 | real :: uold,vold,wold,vdepo(maxspec) |
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| 119 | !real uprof(nzmax),vprof(nzmax),wprof(nzmax) |
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| 120 | !real usigprof(nzmax),vsigprof(nzmax),wsigprof(nzmax) |
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| 121 | !real rhoprof(nzmax),rhogradprof(nzmax) |
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| 122 | real :: rhoa,rhograd,delz,dtf,rhoaux,dtftlw,uxscale,wpscale |
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| 123 | integer(kind=2) :: icbt |
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| 124 | real,parameter :: eps=nxmax/3.e5,eps2=1.e-9 |
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| 125 | real :: ptot_lhh,Q_lhh,phi_lhh,ath,bth !modified by mc |
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| 126 | real :: old_wp_buf,dcas,dcas1,del_test !added by mc |
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| 127 | integer :: i_well,jj,flagrein !test well mixed: modified by mc |
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| 128 | |
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| 129 | |
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| 130 | !!! CHANGE: TEST OF THE WELL-MIXED CRITERION |
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| 131 | ! integer,parameter :: iclass=10 |
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| 132 | ! real(kind=dp) :: zacc,tacc,t(iclass),th(0:iclass),hsave |
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| 133 | ! logical dump |
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| 134 | ! save zacc,tacc,t,th,hsave,dump |
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| 135 | !!! CHANGE |
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| 136 | |
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| 137 | integer :: idummy = -7 |
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| 138 | real :: settling = 0. |
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| 139 | |
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| 140 | |
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| 141 | !!! CHANGE: TEST OF THE WELL-MIXED CRITERION |
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| 142 | !if (idummy.eq.-7) then |
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| 143 | !open(550,file='WELLMIXEDTEST') |
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| 144 | !do 17 i=0,iclass |
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| 145 | !7 th(i)=real(i)/real(iclass) |
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| 146 | !endif |
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| 147 | !!! CHANGE |
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| 148 | |
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| 149 | |
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| 150 | nstop=0 |
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| 151 | do i=1,nmixz |
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| 152 | indzindicator(i)=.true. |
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| 153 | end do |
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| 154 | |
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| 155 | |
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| 156 | if (DRYDEP) then ! reset probability for deposition |
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| 157 | do ks=1,nspec |
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| 158 | depoindicator(ks)=.true. |
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| 159 | prob(ks)=0. |
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| 160 | end do |
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| 161 | endif |
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| 162 | |
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| 163 | dxsave=0. ! reset position displacements |
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| 164 | dysave=0. ! due to mean wind |
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| 165 | dawsave=0. ! and turbulent wind |
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| 166 | dcwsave=0. |
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| 167 | |
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| 168 | itimec=itime |
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| 169 | |
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| 170 | nrand=int(ran3(idummy)*real(maxrand-1))+1 |
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| 171 | |
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| 172 | |
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| 173 | ! Determine whether lat/long grid or polarstereographic projection |
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| 174 | ! is to be used |
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| 175 | ! Furthermore, determine which nesting level to be used |
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| 176 | !***************************************************************** |
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| 177 | |
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| 178 | if (nglobal.and.(yt.gt.switchnorthg)) then |
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| 179 | ngrid=-1 |
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| 180 | else if (sglobal.and.(yt.lt.switchsouthg)) then |
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| 181 | ngrid=-2 |
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| 182 | else |
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| 183 | ngrid=0 |
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| 184 | do j=numbnests,1,-1 |
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| 185 | if ((xt.gt.xln(j)+eps).and.(xt.lt.xrn(j)-eps).and. & |
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| 186 | (yt.gt.yln(j)+eps).and.(yt.lt.yrn(j)-eps)) then |
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| 187 | ngrid=j |
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| 188 | goto 23 |
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| 189 | endif |
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| 190 | end do |
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| 191 | 23 continue |
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| 192 | endif |
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| 193 | |
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| 194 | |
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| 195 | !*************************** |
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| 196 | ! Interpolate necessary data |
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| 197 | !*************************** |
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| 198 | |
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| 199 | if (abs(itime-memtime(1)).lt.abs(itime-memtime(2))) then |
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| 200 | memindnext=1 |
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| 201 | else |
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| 202 | memindnext=2 |
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| 203 | endif |
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| 204 | |
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| 205 | ! Determine nested grid coordinates |
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| 206 | !********************************** |
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| 207 | |
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| 208 | if (ngrid.gt.0) then |
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| 209 | xtn=(xt-xln(ngrid))*xresoln(ngrid) |
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| 210 | ytn=(yt-yln(ngrid))*yresoln(ngrid) |
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| 211 | ix=int(xtn) |
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| 212 | jy=int(ytn) |
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| 213 | nix=nint(xtn) |
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| 214 | njy=nint(ytn) |
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| 215 | else |
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| 216 | ix=int(xt) |
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| 217 | jy=int(yt) |
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| 218 | nix=nint(xt) |
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| 219 | njy=nint(yt) |
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| 220 | endif |
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| 221 | ixp=ix+1 |
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| 222 | jyp=jy+1 |
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| 223 | |
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| 224 | |
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| 225 | ! Compute maximum mixing height around particle position |
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| 226 | !******************************************************* |
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| 227 | |
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| 228 | h=0. |
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| 229 | if (ngrid.le.0) then |
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| 230 | do k=1,2 |
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| 231 | mind=memind(k) ! eso: compatibility with 3-field version |
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| 232 | do j=jy,jyp |
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| 233 | do i=ix,ixp |
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| 234 | if (hmix(i,j,1,mind).gt.h) h=hmix(i,j,1,mind) |
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| 235 | end do |
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| 236 | end do |
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| 237 | end do |
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| 238 | tropop=tropopause(nix,njy,1,1) |
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| 239 | else |
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| 240 | do k=1,2 |
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| 241 | mind=memind(k) |
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| 242 | do j=jy,jyp |
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| 243 | do i=ix,ixp |
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| 244 | if (hmixn(i,j,1,mind,ngrid).gt.h) h=hmixn(i,j,1,mind,ngrid) |
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| 245 | end do |
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| 246 | end do |
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| 247 | end do |
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| 248 | tropop=tropopausen(nix,njy,1,1,ngrid) |
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| 249 | endif |
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| 250 | |
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| 251 | zeta=zt/h |
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| 252 | |
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| 253 | |
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| 254 | |
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| 255 | !************************************************************* |
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| 256 | ! If particle is in the PBL, interpolate once and then make a |
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| 257 | ! time loop until end of interval is reached |
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| 258 | !************************************************************* |
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| 259 | |
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| 260 | if (zeta.le.1.) then |
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| 261 | |
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| 262 | ! BEGIN TIME LOOP |
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| 263 | !================ |
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| 264 | |
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| 265 | loop=0 |
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| 266 | 100 loop=loop+1 |
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| 267 | if (method.eq.1) then |
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| 268 | ldt=min(ldt,abs(lsynctime-itimec+itime)) |
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| 269 | itimec=itimec+ldt*ldirect |
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| 270 | else |
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| 271 | ldt=abs(lsynctime) |
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| 272 | itimec=itime+lsynctime |
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| 273 | endif |
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| 274 | dt=real(ldt) |
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| 275 | |
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| 276 | zeta=zt/h |
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| 277 | |
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| 278 | |
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| 279 | if (loop.eq.1) then |
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| 280 | if (ngrid.le.0) then |
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| 281 | xts=real(xt) |
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| 282 | yts=real(yt) |
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| 283 | call interpol_all(itime,xts,yts,zt) |
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| 284 | else |
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| 285 | call interpol_all_nests(itime,xtn,ytn,zt) |
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| 286 | endif |
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| 287 | |
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| 288 | else |
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| 289 | |
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| 290 | |
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| 291 | ! Determine the level below the current position for u,v,rho |
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| 292 | !*********************************************************** |
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| 293 | |
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| 294 | do i=2,nz |
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| 295 | if (height(i).gt.zt) then |
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| 296 | indz=i-1 |
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| 297 | indzp=i |
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| 298 | goto 6 |
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| 299 | endif |
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| 300 | end do |
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| 301 | 6 continue |
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| 302 | |
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| 303 | ! If one of the levels necessary is not yet available, |
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| 304 | ! calculate it |
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| 305 | !***************************************************** |
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| 306 | |
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| 307 | do i=indz,indzp |
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| 308 | if (indzindicator(i)) then |
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| 309 | if (ngrid.le.0) then |
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| 310 | call interpol_misslev(i) |
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| 311 | else |
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| 312 | call interpol_misslev_nests(i) |
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| 313 | endif |
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| 314 | endif |
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| 315 | end do |
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| 316 | endif |
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| 317 | |
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| 318 | |
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| 319 | ! Vertical interpolation of u,v,w,rho and drhodz |
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| 320 | !*********************************************** |
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| 321 | |
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| 322 | ! Vertical distance to the level below and above current position |
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| 323 | ! both in terms of (u,v) and (w) fields |
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| 324 | !**************************************************************** |
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| 325 | |
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| 326 | dz=1./(height(indzp)-height(indz)) |
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| 327 | dz1=(zt-height(indz))*dz |
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| 328 | dz2=(height(indzp)-zt)*dz |
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| 329 | |
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| 330 | u=dz1*uprof(indzp)+dz2*uprof(indz) |
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| 331 | v=dz1*vprof(indzp)+dz2*vprof(indz) |
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| 332 | w=dz1*wprof(indzp)+dz2*wprof(indz) |
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| 333 | rhoa=dz1*rhoprof(indzp)+dz2*rhoprof(indz) |
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| 334 | rhograd=dz1*rhogradprof(indzp)+dz2*rhogradprof(indz) |
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| 335 | |
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| 336 | |
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| 337 | ! Compute the turbulent disturbances |
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| 338 | ! Determine the sigmas and the timescales |
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| 339 | !**************************************** |
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| 340 | |
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| 341 | if (turbswitch) then |
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| 342 | call hanna(zt) |
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| 343 | else |
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| 344 | call hanna1(zt) |
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| 345 | endif |
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| 346 | |
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| 347 | |
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| 348 | !***************************************** |
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| 349 | ! Determine the new diffusivity velocities |
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| 350 | !***************************************** |
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| 351 | |
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| 352 | ! Horizontal components |
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| 353 | !********************** |
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| 354 | |
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| 355 | if (nrand+1.gt.maxrand) nrand=1 |
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| 356 | if (dt/tlu.lt..5) then |
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| 357 | up=(1.-dt/tlu)*up+rannumb(nrand)*sigu*sqrt(2.*dt/tlu) |
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| 358 | else |
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| 359 | ru=exp(-dt/tlu) |
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| 360 | up=ru*up+rannumb(nrand)*sigu*sqrt(1.-ru**2) |
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| 361 | endif |
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| 362 | if (dt/tlv.lt..5) then |
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| 363 | vp=(1.-dt/tlv)*vp+rannumb(nrand+1)*sigv*sqrt(2.*dt/tlv) |
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| 364 | else |
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| 365 | rv=exp(-dt/tlv) |
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| 366 | vp=rv*vp+rannumb(nrand+1)*sigv*sqrt(1.-rv**2) |
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| 367 | endif |
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| 368 | nrand=nrand+2 |
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| 369 | |
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| 370 | |
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| 371 | if (nrand+ifine.gt.maxrand) nrand=1 |
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| 372 | rhoaux=rhograd/rhoa |
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| 373 | dtf=dt*fine |
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| 374 | |
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| 375 | dtftlw=dtf/tlw |
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| 376 | |
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| 377 | ! Loop over ifine short time steps for vertical component |
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| 378 | !******************************************************** |
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| 379 | |
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| 380 | do i=1,ifine |
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| 381 | |
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| 382 | ! Determine the drift velocity and density correction velocity |
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| 383 | !************************************************************* |
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| 384 | |
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| 385 | if (turbswitch) then |
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| 386 | if (dtftlw.lt..5) then |
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| 387 | !************************************************************* |
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| 388 | !************** CBL options added by mc see routine cblf90 *** |
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| 389 | if (cblflag.eq.1) then !modified by mc |
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| 390 | if (-h/ol.gt.5) then !modified by mc |
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| 391 | !if (ol.lt.0.) then !modified by mc |
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| 392 | !if (ol.gt.0.) then !modified by mc : for test |
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| 393 | !print *,zt,wp,ath,bth,tlw,dtf,'prima' |
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| 394 | flagrein=0 |
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| 395 | nrand=nrand+1 |
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| 396 | old_wp_buf=wp |
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| 397 | call cbl(wp,zt,ust,wst,h,rhoa,rhograd,sigw,dsigwdz,tlw,ptot_lhh,Q_lhh,phi_lhh,ath,bth,ol,flagrein) !inside the routine for inverse time |
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| 398 | wp=(wp+ath*dtf+bth*rannumb(nrand)*sqrt(dtf))*real(icbt) |
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| 399 | ! wp=(wp+ath*dtf+bth*gasdev2(mydum)*sqrt(dtf))*real(icbt) |
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| 400 | delz=wp*dtf |
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| 401 | if (flagrein.eq.1) then |
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| 402 | call re_initialize_particle(zt,ust,wst,h,sigw,old_wp_buf,nrand,ol) |
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| 403 | wp=old_wp_buf |
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| 404 | delz=wp*dtf |
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| 405 | nan_count=nan_count+1 |
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| 406 | end if |
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| 407 | !print *,zt,wp,ath,bth,tlw,dtf,rannumb(nrand+i),icbt |
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| 408 | !pause |
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| 409 | else |
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| 410 | nrand=nrand+1 |
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| 411 | old_wp_buf=wp |
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| 412 | ath=-wp/tlw+sigw*dsigwdz+wp*wp/sigw*dsigwdz+sigw*sigw/rhoa*rhograd !1-note for inverse time should be -wp/tlw*ldirect+... calculated for wp=-wp |
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| 413 | !2-but since ldirect =-1 for inverse time and this must be calculated for (-wp) and |
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| 414 | !3-the gaussian pdf is symmetric (i.e. pdf(w)=pdf(-w) ldirect can be discarded |
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| 415 | bth=sigw*rannumb(nrand)*sqrt(2.*dtftlw) |
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| 416 | wp=(wp+ath*dtf+bth)*real(icbt) |
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| 417 | delz=wp*dtf |
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| 418 | del_test=(1.-wp)/wp !catch infinity value |
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| 419 | if (isnan(wp).or.isnan(del_test)) then |
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| 420 | nrand=nrand+1 |
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| 421 | wp=sigw*rannumb(nrand) |
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| 422 | delz=wp*dtf |
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| 423 | nan_count2=nan_count2+1 |
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| 424 | !print *,'NaN coutner equal to:', nan_count,'reduce ifine if this number became a non-negligible fraction of the particle number' |
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| 425 | end if |
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| 426 | end if |
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| 427 | !******************** END CBL option ******************************* |
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| 428 | !******************************************************************* |
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| 429 | else |
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| 430 | wp=((1.-dtftlw)*wp+rannumb(nrand+i)*sqrt(2.*dtftlw) & |
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| 431 | +dtf*(dsigwdz+rhoaux*sigw))*real(icbt) |
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| 432 | delz=wp*sigw*dtf |
|---|
| 433 | end if |
|---|
| 434 | else |
|---|
| 435 | rw=exp(-dtftlw) |
|---|
| 436 | wp=(rw*wp+rannumb(nrand+i)*sqrt(1.-rw**2) & |
|---|
| 437 | +tlw*(1.-rw)*(dsigwdz+rhoaux*sigw))*real(icbt) |
|---|
| 438 | delz=wp*sigw*dtf |
|---|
| 439 | endif |
|---|
| 440 | |
|---|
| 441 | else |
|---|
| 442 | rw=exp(-dtftlw) |
|---|
| 443 | wp=(rw*wp+rannumb(nrand+i)*sqrt(1.-rw**2)*sigw & |
|---|
| 444 | +tlw*(1.-rw)*(dsigw2dz+rhoaux*sigw**2))*real(icbt) |
|---|
| 445 | delz=wp*dtf |
|---|
| 446 | endif |
|---|
| 447 | |
|---|
| 448 | !**************************************************** |
|---|
| 449 | ! Compute turbulent vertical displacement of particle |
|---|
| 450 | !**************************************************** |
|---|
| 451 | |
|---|
| 452 | if (abs(delz).gt.h) delz=mod(delz,h) |
|---|
| 453 | |
|---|
| 454 | ! Determine if particle transfers to a "forbidden state" below the ground |
|---|
| 455 | ! or above the mixing height |
|---|
| 456 | !************************************************************************ |
|---|
| 457 | |
|---|
| 458 | if (delz.lt.-zt) then ! reflection at ground |
|---|
| 459 | icbt=-1 |
|---|
| 460 | zt=-zt-delz |
|---|
| 461 | else if (delz.gt.(h-zt)) then ! reflection at h |
|---|
| 462 | icbt=-1 |
|---|
| 463 | zt=-zt-delz+2.*h |
|---|
| 464 | else ! no reflection |
|---|
| 465 | icbt=1 |
|---|
| 466 | zt=zt+delz |
|---|
| 467 | endif |
|---|
| 468 | |
|---|
| 469 | if (i.ne.ifine) then |
|---|
| 470 | zeta=zt/h |
|---|
| 471 | call hanna_short(zt) |
|---|
| 472 | endif |
|---|
| 473 | |
|---|
| 474 | end do |
|---|
| 475 | if (cblflag.ne.1) nrand=nrand+i |
|---|
| 476 | |
|---|
| 477 | ! Determine time step for next integration |
|---|
| 478 | !***************************************** |
|---|
| 479 | |
|---|
| 480 | if (turbswitch) then |
|---|
| 481 | ldt=int(min(tlw,h/max(2.*abs(wp*sigw),1.e-5), & |
|---|
| 482 | 0.5/abs(dsigwdz))*ctl) |
|---|
| 483 | else |
|---|
| 484 | ldt=int(min(tlw,h/max(2.*abs(wp),1.e-5))*ctl) |
|---|
| 485 | endif |
|---|
| 486 | ldt=max(ldt,mintime) |
|---|
| 487 | |
|---|
| 488 | |
|---|
| 489 | ! If particle represents only a single species, add gravitational settling |
|---|
| 490 | ! velocity. The settling velocity is zero for gases, or if particle |
|---|
| 491 | ! represents more than one species |
|---|
| 492 | !************************************************************************* |
|---|
| 493 | |
|---|
| 494 | if (mdomainfill.eq.0) then |
|---|
| 495 | do nsp=1,nspec |
|---|
| 496 | if (xmass(nrelpoint,nsp).gt.eps2) goto 887 |
|---|
| 497 | end do |
|---|
| 498 | 887 nsp=min(nsp,nspec) |
|---|
| 499 | !!$ if (density(nsp).gt.0.) & |
|---|
| 500 | !!$ call get_settling(itime,xts,yts,zt,nsp,settling) !old |
|---|
| 501 | if (density(nsp).gt.0.) & |
|---|
| 502 | call get_settling(itime,real(xt),real(yt),zt,nsp,settling) !bugfix |
|---|
| 503 | w=w+settling |
|---|
| 504 | endif |
|---|
| 505 | |
|---|
| 506 | ! Horizontal displacements during time step dt are small real values compared |
|---|
| 507 | ! to the position; adding the two, would result in large numerical errors. |
|---|
| 508 | ! Thus, displacements are accumulated during lsynctime and are added to the |
|---|
| 509 | ! position at the end |
|---|
| 510 | !**************************************************************************** |
|---|
| 511 | |
|---|
| 512 | dxsave=dxsave+u*dt |
|---|
| 513 | dysave=dysave+v*dt |
|---|
| 514 | dawsave=dawsave+up*dt |
|---|
| 515 | dcwsave=dcwsave+vp*dt |
|---|
| 516 | zt=zt+w*dt*real(ldirect) |
|---|
| 517 | |
|---|
| 518 | ! HSO/AL: Particle managed to go over highest level -> interpolation error in goto 700 |
|---|
| 519 | ! alias interpol_wind (division by zero) |
|---|
| 520 | if (zt.ge.height(nz)) zt=height(nz)-100.*eps |
|---|
| 521 | |
|---|
| 522 | if (zt.gt.h) then |
|---|
| 523 | if (itimec.eq.itime+lsynctime) goto 99 |
|---|
| 524 | goto 700 ! complete the current interval above PBL |
|---|
| 525 | endif |
|---|
| 526 | |
|---|
| 527 | |
|---|
| 528 | !!! CHANGE: TEST OF THE WELL-MIXED CRITERION |
|---|
| 529 | !!! These lines may be switched on to test the well-mixed criterion |
|---|
| 530 | !if (zt.le.h) then |
|---|
| 531 | ! zacc=zacc+zt/h*dt |
|---|
| 532 | ! hsave=hsave+h*dt |
|---|
| 533 | ! tacc=tacc+dt |
|---|
| 534 | ! do 67 i=1,iclass |
|---|
| 535 | ! if ((zt/h.gt.th(i-1)).and.(zt/h.le.th(i))) |
|---|
| 536 | ! + t(i)=t(i)+dt |
|---|
| 537 | !7 continue |
|---|
| 538 | !endif |
|---|
| 539 | !if ((mod(itime,10800).eq.0).and.dump) then |
|---|
| 540 | ! dump=.false. |
|---|
| 541 | ! write(550,'(i6,12f10.3)') itime,hsave/tacc,zacc/tacc, |
|---|
| 542 | ! + (t(i)/tacc*real(iclass),i=1,iclass) |
|---|
| 543 | ! zacc=0. |
|---|
| 544 | ! tacc=0. |
|---|
| 545 | ! do 68 i=1,iclass |
|---|
| 546 | !8 t(i)=0. |
|---|
| 547 | ! hsave=0. |
|---|
| 548 | !endif |
|---|
| 549 | !if (mod(itime,10800).ne.0) dump=.true. |
|---|
| 550 | !!! CHANGE |
|---|
| 551 | |
|---|
| 552 | ! Determine probability of deposition |
|---|
| 553 | !************************************ |
|---|
| 554 | |
|---|
| 555 | if ((DRYDEP).and.(zt.lt.2.*href)) then |
|---|
| 556 | do ks=1,nspec |
|---|
| 557 | if (DRYDEPSPEC(ks)) then |
|---|
| 558 | if (depoindicator(ks)) then |
|---|
| 559 | if (ngrid.le.0) then |
|---|
| 560 | call interpol_vdep(ks,vdepo(ks)) |
|---|
| 561 | else |
|---|
| 562 | call interpol_vdep_nests(ks,vdepo(ks)) |
|---|
| 563 | endif |
|---|
| 564 | endif |
|---|
| 565 | ! correction by Petra Seibert, 10 April 2001 |
|---|
| 566 | ! this formulation means that prob(n) = 1 - f(0)*...*f(n) |
|---|
| 567 | ! where f(n) is the exponential term |
|---|
| 568 | prob(ks)=1.+(prob(ks)-1.)* & |
|---|
| 569 | exp(-vdepo(ks)*abs(dt)/(2.*href)) |
|---|
| 570 | endif |
|---|
| 571 | end do |
|---|
| 572 | endif |
|---|
| 573 | |
|---|
| 574 | if (zt.lt.0.) zt=min(h-eps2,-1.*zt) ! if particle below ground -> reflection |
|---|
| 575 | |
|---|
| 576 | if (itimec.eq.(itime+lsynctime)) then |
|---|
| 577 | usig=0.5*(usigprof(indzp)+usigprof(indz)) |
|---|
| 578 | vsig=0.5*(vsigprof(indzp)+vsigprof(indz)) |
|---|
| 579 | wsig=0.5*(wsigprof(indzp)+wsigprof(indz)) |
|---|
| 580 | goto 99 ! finished |
|---|
| 581 | endif |
|---|
| 582 | goto 100 |
|---|
| 583 | |
|---|
| 584 | ! END TIME LOOP |
|---|
| 585 | !============== |
|---|
| 586 | |
|---|
| 587 | |
|---|
| 588 | endif |
|---|
| 589 | |
|---|
| 590 | |
|---|
| 591 | |
|---|
| 592 | !********************************************************** |
|---|
| 593 | ! For all particles that are outside the PBL, make a single |
|---|
| 594 | ! time step. Only horizontal turbulent disturbances are |
|---|
| 595 | ! calculated. Vertical disturbances are reset. |
|---|
| 596 | !********************************************************** |
|---|
| 597 | |
|---|
| 598 | |
|---|
| 599 | ! Interpolate the wind |
|---|
| 600 | !********************* |
|---|
| 601 | |
|---|
| 602 | 700 continue |
|---|
| 603 | if (ngrid.le.0) then |
|---|
| 604 | xts=real(xt) |
|---|
| 605 | yts=real(yt) |
|---|
| 606 | call interpol_wind(itime,xts,yts,zt) |
|---|
| 607 | else |
|---|
| 608 | call interpol_wind_nests(itime,xtn,ytn,zt) |
|---|
| 609 | endif |
|---|
| 610 | |
|---|
| 611 | |
|---|
| 612 | ! Compute everything for above the PBL |
|---|
| 613 | |
|---|
| 614 | ! Assume constant, uncorrelated, turbulent perturbations |
|---|
| 615 | ! In the stratosphere, use a small vertical diffusivity d_strat, |
|---|
| 616 | ! in the troposphere, use a larger horizontal diffusivity d_trop. |
|---|
| 617 | ! Turbulent velocity scales are determined based on sqrt(d_trop/dt) |
|---|
| 618 | !****************************************************************** |
|---|
| 619 | |
|---|
| 620 | ldt=abs(lsynctime-itimec+itime) |
|---|
| 621 | dt=real(ldt) |
|---|
| 622 | |
|---|
| 623 | if (zt.lt.tropop) then ! in the troposphere |
|---|
| 624 | uxscale=sqrt(2.*d_trop/dt) |
|---|
| 625 | if (nrand+1.gt.maxrand) nrand=1 |
|---|
| 626 | ux=rannumb(nrand)*uxscale |
|---|
| 627 | vy=rannumb(nrand+1)*uxscale |
|---|
| 628 | nrand=nrand+2 |
|---|
| 629 | wp=0. |
|---|
| 630 | else if (zt.lt.tropop+1000.) then ! just above the tropopause: make transition |
|---|
| 631 | weight=(zt-tropop)/1000. |
|---|
| 632 | uxscale=sqrt(2.*d_trop/dt*(1.-weight)) |
|---|
| 633 | if (nrand+2.gt.maxrand) nrand=1 |
|---|
| 634 | ux=rannumb(nrand)*uxscale |
|---|
| 635 | vy=rannumb(nrand+1)*uxscale |
|---|
| 636 | wpscale=sqrt(2.*d_strat/dt*weight) |
|---|
| 637 | wp=rannumb(nrand+2)*wpscale+d_strat/1000. |
|---|
| 638 | nrand=nrand+3 |
|---|
| 639 | else ! in the stratosphere |
|---|
| 640 | if (nrand.gt.maxrand) nrand=1 |
|---|
| 641 | ux=0. |
|---|
| 642 | vy=0. |
|---|
| 643 | wpscale=sqrt(2.*d_strat/dt) |
|---|
| 644 | wp=rannumb(nrand)*wpscale |
|---|
| 645 | nrand=nrand+1 |
|---|
| 646 | endif |
|---|
| 647 | |
|---|
| 648 | |
|---|
| 649 | ! If particle represents only a single species, add gravitational settling |
|---|
| 650 | ! velocity. The settling velocity is zero for gases |
|---|
| 651 | !************************************************************************* |
|---|
| 652 | |
|---|
| 653 | |
|---|
| 654 | |
|---|
| 655 | if (mdomainfill.eq.0) then |
|---|
| 656 | do nsp=1,nspec |
|---|
| 657 | if (xmass(nrelpoint,nsp).gt.eps2) goto 888 |
|---|
| 658 | end do |
|---|
| 659 | 888 nsp=min(nsp,nspec) |
|---|
| 660 | !!$ if (density(nsp).gt.0.) & |
|---|
| 661 | !!$ call get_settling(itime,xts,yts,zt,nsp,settling) !old |
|---|
| 662 | if (density(nsp).gt.0.) & |
|---|
| 663 | call get_settling(itime,real(xt),real(yt),zt,nsp,settling) !bugfix |
|---|
| 664 | w=w+settling |
|---|
| 665 | endif |
|---|
| 666 | |
|---|
| 667 | ! Calculate position at time step itime+lsynctime |
|---|
| 668 | !************************************************ |
|---|
| 669 | |
|---|
| 670 | dxsave=dxsave+(u+ux)*dt |
|---|
| 671 | dysave=dysave+(v+vy)*dt |
|---|
| 672 | zt=zt+(w+wp)*dt*real(ldirect) |
|---|
| 673 | if (zt.lt.0.) zt=min(h-eps2,-1.*zt) ! if particle below ground -> reflection |
|---|
| 674 | |
|---|
| 675 | 99 continue |
|---|
| 676 | |
|---|
| 677 | |
|---|
| 678 | |
|---|
| 679 | !**************************************************************** |
|---|
| 680 | ! Add mesoscale random disturbances |
|---|
| 681 | ! This is done only once for the whole lsynctime interval to save |
|---|
| 682 | ! computation time |
|---|
| 683 | !**************************************************************** |
|---|
| 684 | |
|---|
| 685 | |
|---|
| 686 | ! Mesoscale wind velocity fluctuations are obtained by scaling |
|---|
| 687 | ! with the standard deviation of the grid-scale winds surrounding |
|---|
| 688 | ! the particle location, multiplied by a factor turbmesoscale. |
|---|
| 689 | ! The autocorrelation time constant is taken as half the |
|---|
| 690 | ! time interval between wind fields |
|---|
| 691 | !**************************************************************** |
|---|
| 692 | |
|---|
| 693 | r=exp(-2.*real(abs(lsynctime))/real(lwindinterv)) |
|---|
| 694 | rs=sqrt(1.-r**2) |
|---|
| 695 | if (nrand+2.gt.maxrand) nrand=1 |
|---|
| 696 | usigold=r*usigold+rs*rannumb(nrand)*usig*turbmesoscale |
|---|
| 697 | vsigold=r*vsigold+rs*rannumb(nrand+1)*vsig*turbmesoscale |
|---|
| 698 | wsigold=r*wsigold+rs*rannumb(nrand+2)*wsig*turbmesoscale |
|---|
| 699 | |
|---|
| 700 | dxsave=dxsave+usigold*real(lsynctime) |
|---|
| 701 | dysave=dysave+vsigold*real(lsynctime) |
|---|
| 702 | |
|---|
| 703 | zt=zt+wsigold*real(lsynctime) |
|---|
| 704 | if (zt.lt.0.) zt=-1.*zt ! if particle below ground -> refletion |
|---|
| 705 | |
|---|
| 706 | !************************************************************* |
|---|
| 707 | ! Transform along and cross wind components to xy coordinates, |
|---|
| 708 | ! add them to u and v, transform u,v to grid units/second |
|---|
| 709 | ! and calculate new position |
|---|
| 710 | !************************************************************* |
|---|
| 711 | |
|---|
| 712 | call windalign(dxsave,dysave,dawsave,dcwsave,ux,vy) |
|---|
| 713 | dxsave=dxsave+ux ! comment by mc: comment this line to stop the particles horizontally for test reasons |
|---|
| 714 | dysave=dysave+vy |
|---|
| 715 | if (ngrid.ge.0) then |
|---|
| 716 | cosfact=dxconst/cos((yt*dy+ylat0)*pi180) |
|---|
| 717 | xt=xt+real(dxsave*cosfact*real(ldirect),kind=dp) |
|---|
| 718 | yt=yt+real(dysave*dyconst*real(ldirect),kind=dp) |
|---|
| 719 | else if (ngrid.eq.-1) then ! around north pole |
|---|
| 720 | xlon=xlon0+xt*dx !comment by mc: compute old particle position |
|---|
| 721 | ylat=ylat0+yt*dy |
|---|
| 722 | call cll2xy(northpolemap,ylat,xlon,xpol,ypol) !convert old particle position in polar stereographic |
|---|
| 723 | gridsize=1000.*cgszll(northpolemap,ylat,xlon) !calculate size in m of grid element in polar stereographic coordinate |
|---|
| 724 | dxsave=dxsave/gridsize !increment from meter to grdi unit |
|---|
| 725 | dysave=dysave/gridsize |
|---|
| 726 | xpol=xpol+dxsave*real(ldirect) !position in grid unit polar stereographic |
|---|
| 727 | ypol=ypol+dysave*real(ldirect) |
|---|
| 728 | call cxy2ll(northpolemap,xpol,ypol,ylat,xlon) !convert to lat long coordinate |
|---|
| 729 | xt=(xlon-xlon0)/dx !convert to grid units in lat long coordinate, comment by mc |
|---|
| 730 | yt=(ylat-ylat0)/dy |
|---|
| 731 | else if (ngrid.eq.-2) then ! around south pole |
|---|
| 732 | xlon=xlon0+xt*dx |
|---|
| 733 | ylat=ylat0+yt*dy |
|---|
| 734 | call cll2xy(southpolemap,ylat,xlon,xpol,ypol) |
|---|
| 735 | gridsize=1000.*cgszll(southpolemap,ylat,xlon) |
|---|
| 736 | dxsave=dxsave/gridsize |
|---|
| 737 | dysave=dysave/gridsize |
|---|
| 738 | xpol=xpol+dxsave*real(ldirect) |
|---|
| 739 | ypol=ypol+dysave*real(ldirect) |
|---|
| 740 | call cxy2ll(southpolemap,xpol,ypol,ylat,xlon) |
|---|
| 741 | xt=(xlon-xlon0)/dx |
|---|
| 742 | yt=(ylat-ylat0)/dy |
|---|
| 743 | endif |
|---|
| 744 | |
|---|
| 745 | |
|---|
| 746 | ! If global data are available, use cyclic boundary condition |
|---|
| 747 | !************************************************************ |
|---|
| 748 | |
|---|
| 749 | if (xglobal) then |
|---|
| 750 | if (xt.ge.real(nxmin1)) xt=xt-real(nxmin1) |
|---|
| 751 | if (xt.lt.0.) xt=xt+real(nxmin1) |
|---|
| 752 | if (xt.le.eps) xt=eps |
|---|
| 753 | if (abs(xt-real(nxmin1)).le.eps) xt=real(nxmin1)-eps |
|---|
| 754 | endif |
|---|
| 755 | |
|---|
| 756 | ! HSO/AL: Prevent particles from disappearing at the pole |
|---|
| 757 | !****************************************************************** |
|---|
| 758 | |
|---|
| 759 | if ( yt.lt.0. ) then |
|---|
| 760 | xt=mod(xt+180.,360.) |
|---|
| 761 | yt=-yt |
|---|
| 762 | else if ( yt.gt.real(nymin1) ) then |
|---|
| 763 | xt=mod(xt+180.,360.) |
|---|
| 764 | yt=2*real(nymin1)-yt |
|---|
| 765 | endif |
|---|
| 766 | |
|---|
| 767 | ! Check position: If trajectory outside model domain, terminate it |
|---|
| 768 | !***************************************************************** |
|---|
| 769 | |
|---|
| 770 | if ((xt.lt.0.).or.(xt.ge.real(nxmin1)).or.(yt.lt.0.).or. & |
|---|
| 771 | (yt.gt.real(nymin1))) then |
|---|
| 772 | nstop=3 |
|---|
| 773 | return |
|---|
| 774 | endif |
|---|
| 775 | |
|---|
| 776 | ! If particle above highest model level, set it back into the domain |
|---|
| 777 | !******************************************************************* |
|---|
| 778 | |
|---|
| 779 | if (zt.ge.height(nz)) zt=height(nz)-100.*eps |
|---|
| 780 | |
|---|
| 781 | |
|---|
| 782 | !************************************************************************ |
|---|
| 783 | ! Now we could finish, as this was done in FLEXPART versions up to 4.0. |
|---|
| 784 | ! However, truncation errors of the advection can be significantly |
|---|
| 785 | ! reduced by doing one iteration of the Petterssen scheme, if this is |
|---|
| 786 | ! possible. |
|---|
| 787 | ! Note that this is applied only to the grid-scale winds, not to |
|---|
| 788 | ! the turbulent winds. |
|---|
| 789 | !************************************************************************ |
|---|
| 790 | |
|---|
| 791 | ! The Petterssen scheme can only applied with long time steps (only then u |
|---|
| 792 | ! is the "old" wind as required by the scheme); otherwise do nothing |
|---|
| 793 | !************************************************************************* |
|---|
| 794 | |
|---|
| 795 | if (ldt.ne.abs(lsynctime)) return |
|---|
| 796 | |
|---|
| 797 | ! The Petterssen scheme can only be applied if the ending time of the time step |
|---|
| 798 | ! (itime+ldt*ldirect) is still between the two wind fields held in memory; |
|---|
| 799 | ! otherwise do nothing |
|---|
| 800 | !****************************************************************************** |
|---|
| 801 | |
|---|
| 802 | if (abs(itime+ldt*ldirect).gt.abs(memtime(2))) return |
|---|
| 803 | |
|---|
| 804 | ! Apply it also only if starting and ending point of current time step are on |
|---|
| 805 | ! the same grid; otherwise do nothing |
|---|
| 806 | !***************************************************************************** |
|---|
| 807 | if (nglobal.and.(yt.gt.switchnorthg)) then |
|---|
| 808 | ngr=-1 |
|---|
| 809 | else if (sglobal.and.(yt.lt.switchsouthg)) then |
|---|
| 810 | ngr=-2 |
|---|
| 811 | else |
|---|
| 812 | ngr=0 |
|---|
| 813 | do j=numbnests,1,-1 |
|---|
| 814 | if ((xt.gt.xln(j)+eps).and.(xt.lt.xrn(j)-eps).and. & |
|---|
| 815 | (yt.gt.yln(j)+eps).and.(yt.lt.yrn(j)-eps)) then |
|---|
| 816 | ngr=j |
|---|
| 817 | goto 43 |
|---|
| 818 | endif |
|---|
| 819 | end do |
|---|
| 820 | 43 continue |
|---|
| 821 | endif |
|---|
| 822 | |
|---|
| 823 | if (ngr.ne.ngrid) return |
|---|
| 824 | |
|---|
| 825 | ! Determine nested grid coordinates |
|---|
| 826 | !********************************** |
|---|
| 827 | |
|---|
| 828 | if (ngrid.gt.0) then |
|---|
| 829 | xtn=(xt-xln(ngrid))*xresoln(ngrid) |
|---|
| 830 | ytn=(yt-yln(ngrid))*yresoln(ngrid) |
|---|
| 831 | ix=int(xtn) |
|---|
| 832 | jy=int(ytn) |
|---|
| 833 | else |
|---|
| 834 | ix=int(xt) |
|---|
| 835 | jy=int(yt) |
|---|
| 836 | endif |
|---|
| 837 | ixp=ix+1 |
|---|
| 838 | jyp=jy+1 |
|---|
| 839 | |
|---|
| 840 | |
|---|
| 841 | ! Memorize the old wind |
|---|
| 842 | !********************** |
|---|
| 843 | |
|---|
| 844 | uold=u |
|---|
| 845 | vold=v |
|---|
| 846 | wold=w |
|---|
| 847 | |
|---|
| 848 | ! Interpolate wind at new position and time |
|---|
| 849 | !****************************************** |
|---|
| 850 | |
|---|
| 851 | if (ngrid.le.0) then |
|---|
| 852 | xts=real(xt) |
|---|
| 853 | yts=real(yt) |
|---|
| 854 | call interpol_wind_short(itime+ldt*ldirect,xts,yts,zt) |
|---|
| 855 | else |
|---|
| 856 | call interpol_wind_short_nests(itime+ldt*ldirect,xtn,ytn,zt) |
|---|
| 857 | endif |
|---|
| 858 | |
|---|
| 859 | if (mdomainfill.eq.0) then |
|---|
| 860 | do nsp=1,nspec |
|---|
| 861 | if (xmass(nrelpoint,nsp).gt.eps2) goto 889 |
|---|
| 862 | end do |
|---|
| 863 | 889 nsp=min(nsp,nspec) |
|---|
| 864 | !!$ if (density(nsp).gt.0.) & |
|---|
| 865 | !!$ call get_settling(itime+ldt,xts,yts,zt,nsp,settling) !old |
|---|
| 866 | if (density(nsp).gt.0.) & |
|---|
| 867 | call get_settling(itime+ldt,real(xt),real(yt),zt,nsp,settling) !bugfix |
|---|
| 868 | w=w+settling |
|---|
| 869 | endif |
|---|
| 870 | |
|---|
| 871 | |
|---|
| 872 | ! Determine the difference vector between new and old wind |
|---|
| 873 | ! (use half of it to correct position according to Petterssen) |
|---|
| 874 | !************************************************************* |
|---|
| 875 | |
|---|
| 876 | u=(u-uold)/2. |
|---|
| 877 | v=(v-vold)/2. |
|---|
| 878 | w=(w-wold)/2. |
|---|
| 879 | |
|---|
| 880 | |
|---|
| 881 | ! Finally, correct the old position |
|---|
| 882 | !********************************** |
|---|
| 883 | |
|---|
| 884 | zt=zt+w*real(ldt*ldirect) |
|---|
| 885 | if (zt.lt.0.) zt=min(h-eps2,-1.*zt) ! if particle below ground -> reflection |
|---|
| 886 | if (ngrid.ge.0) then |
|---|
| 887 | cosfact=dxconst/cos((yt*dy+ylat0)*pi180) |
|---|
| 888 | xt=xt+real(u*cosfact*real(ldt*ldirect),kind=dp) |
|---|
| 889 | yt=yt+real(v*dyconst*real(ldt*ldirect),kind=dp) |
|---|
| 890 | else if (ngrid.eq.-1) then ! around north pole |
|---|
| 891 | xlon=xlon0+xt*dx |
|---|
| 892 | ylat=ylat0+yt*dy |
|---|
| 893 | call cll2xy(northpolemap,ylat,xlon,xpol,ypol) |
|---|
| 894 | gridsize=1000.*cgszll(northpolemap,ylat,xlon) |
|---|
| 895 | u=u/gridsize |
|---|
| 896 | v=v/gridsize |
|---|
| 897 | xpol=xpol+u*real(ldt*ldirect) |
|---|
| 898 | ypol=ypol+v*real(ldt*ldirect) |
|---|
| 899 | call cxy2ll(northpolemap,xpol,ypol,ylat,xlon) |
|---|
| 900 | xt=(xlon-xlon0)/dx |
|---|
| 901 | yt=(ylat-ylat0)/dy |
|---|
| 902 | else if (ngrid.eq.-2) then ! around south pole |
|---|
| 903 | xlon=xlon0+xt*dx |
|---|
| 904 | ylat=ylat0+yt*dy |
|---|
| 905 | call cll2xy(southpolemap,ylat,xlon,xpol,ypol) |
|---|
| 906 | gridsize=1000.*cgszll(southpolemap,ylat,xlon) |
|---|
| 907 | u=u/gridsize |
|---|
| 908 | v=v/gridsize |
|---|
| 909 | xpol=xpol+u*real(ldt*ldirect) |
|---|
| 910 | ypol=ypol+v*real(ldt*ldirect) |
|---|
| 911 | call cxy2ll(southpolemap,xpol,ypol,ylat,xlon) |
|---|
| 912 | xt=(xlon-xlon0)/dx |
|---|
| 913 | yt=(ylat-ylat0)/dy |
|---|
| 914 | endif |
|---|
| 915 | |
|---|
| 916 | ! If global data are available, use cyclic boundary condition |
|---|
| 917 | !************************************************************ |
|---|
| 918 | |
|---|
| 919 | if (xglobal) then |
|---|
| 920 | if (xt.ge.real(nxmin1)) xt=xt-real(nxmin1) |
|---|
| 921 | if (xt.lt.0.) xt=xt+real(nxmin1) |
|---|
| 922 | if (xt.le.eps) xt=eps |
|---|
| 923 | if (abs(xt-real(nxmin1)).le.eps) xt=real(nxmin1)-eps |
|---|
| 924 | endif |
|---|
| 925 | |
|---|
| 926 | ! HSO/AL: Prevent particles from disappearing at the pole |
|---|
| 927 | !****************************************************************** |
|---|
| 928 | |
|---|
| 929 | if ( yt.lt.0. ) then |
|---|
| 930 | xt=mod(xt+180.,360.) |
|---|
| 931 | yt=-yt |
|---|
| 932 | else if ( yt.gt.real(nymin1) ) then |
|---|
| 933 | xt=mod(xt+180.,360.) |
|---|
| 934 | yt=2*real(nymin1)-yt |
|---|
| 935 | endif |
|---|
| 936 | |
|---|
| 937 | ! Check position: If trajectory outside model domain, terminate it |
|---|
| 938 | !***************************************************************** |
|---|
| 939 | |
|---|
| 940 | if ((xt.lt.0.).or.(xt.ge.real(nxmin1)).or.(yt.lt.0.).or. & |
|---|
| 941 | (yt.gt.real(nymin1))) then |
|---|
| 942 | nstop=3 |
|---|
| 943 | return |
|---|
| 944 | endif |
|---|
| 945 | |
|---|
| 946 | ! If particle above highest model level, set it back into the domain |
|---|
| 947 | !******************************************************************* |
|---|
| 948 | |
|---|
| 949 | if (zt.ge.height(nz)) zt=height(nz)-100.*eps |
|---|
| 950 | |
|---|
| 951 | |
|---|
| 952 | end subroutine advance |
|---|
| 953 | |
|---|
