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 init_domainfill |
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23 | ! |
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24 | !***************************************************************************** |
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25 | ! * |
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26 | ! Initializes particles equally distributed over the first release location * |
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27 | ! specified in file RELEASES. This box is assumed to be the domain for doing * |
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28 | ! domain-filling trajectory calculations. * |
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29 | ! All particles carry the same amount of mass which alltogether comprises the* |
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30 | ! mass of air within the box. * |
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31 | ! * |
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32 | ! Author: A. Stohl * |
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33 | ! * |
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34 | ! 15 October 2002 * |
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35 | ! * |
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36 | ! CHANGES * |
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37 | ! 12/2014 eso: MPI version * |
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38 | !***************************************************************************** |
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39 | ! * |
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40 | ! Variables: * |
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41 | ! * |
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42 | ! numparticlecount consecutively counts the number of particles released * |
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43 | ! nx_we(2) grid indices for western and eastern boundary of domain- * |
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44 | ! filling trajectory calculations * |
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45 | ! ny_sn(2) grid indices for southern and northern boundary of domain- * |
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46 | ! filling trajectory calculations * |
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47 | ! * |
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48 | !***************************************************************************** |
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49 | |
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50 | use point_mod |
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51 | use par_mod |
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52 | use com_mod |
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53 | use random_mod, only: ran1 |
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54 | use mpi_mod |
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55 | |
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56 | implicit none |
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57 | |
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58 | integer :: j,ix,jy,kz,ncolumn,numparttot |
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59 | real :: gridarea(0:nymax-1),pp(nzmax),ylat,ylatp,ylatm,hzone |
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60 | real :: cosfactm,cosfactp,deltacol,dz1,dz2,dz,pnew,fractus |
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61 | real,parameter :: pih=pi/180. |
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62 | real :: colmass(0:nxmax-1,0:nymax-1),colmasstotal,zposition |
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63 | |
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64 | integer :: ixm,ixp,jym,jyp,indzm,indzp,in,indzh,i,jj |
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65 | real :: pvpart,ddx,ddy,rddx,rddy,p1,p2,p3,p4,y1(2) |
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66 | |
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67 | integer :: idummy = -11 |
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68 | logical :: first_call=.true. |
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69 | |
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70 | ! Use different seed for each process |
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71 | if (first_call) then |
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72 | idummy=idummy+mp_seed |
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73 | first_call=.false. |
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74 | end if |
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75 | |
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76 | ! Determine the release region (only full grid cells), over which particles |
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77 | ! shall be initialized |
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78 | ! Use 2 fields for west/east and south/north boundary |
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79 | !************************************************************************** |
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80 | |
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81 | nx_we(1)=max(int(xpoint1(1)),0) |
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82 | nx_we(2)=min((int(xpoint2(1))+1),nxmin1) |
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83 | ny_sn(1)=max(int(ypoint1(1)),0) |
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84 | ny_sn(2)=min((int(ypoint2(1))+1),nymin1) |
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85 | |
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86 | ! For global simulations (both global wind data and global domain-filling), |
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87 | ! set a switch, such that no boundary conditions are used |
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88 | !************************************************************************** |
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89 | if (xglobal.and.sglobal.and.nglobal) then |
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90 | if ((nx_we(1).eq.0).and.(nx_we(2).eq.nxmin1).and. & |
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91 | (ny_sn(1).eq.0).and.(ny_sn(2).eq.nymin1)) then |
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92 | gdomainfill=.true. |
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93 | else |
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94 | gdomainfill=.false. |
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95 | endif |
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96 | endif |
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97 | |
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98 | ! Do not release particles twice (i.e., not at both in the leftmost and rightmost |
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99 | ! grid cell) for a global domain |
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100 | !***************************************************************************** |
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101 | if (xglobal) nx_we(2)=min(nx_we(2),nx-2) |
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102 | |
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103 | |
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104 | ! Calculate area of grid cell with formula M=2*pi*R*h*dx/360, |
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105 | ! see Netz, Formeln der Mathematik, 5. Auflage (1983), p.90 |
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106 | !************************************************************ |
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107 | |
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108 | do jy=ny_sn(1),ny_sn(2) ! loop about latitudes |
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109 | ylat=ylat0+real(jy)*dy |
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110 | ylatp=ylat+0.5*dy |
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111 | ylatm=ylat-0.5*dy |
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112 | if ((ylatm.lt.0).and.(ylatp.gt.0.)) then |
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113 | hzone=1./dyconst |
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114 | else |
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115 | cosfactp=cos(ylatp*pih)*r_earth |
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116 | cosfactm=cos(ylatm*pih)*r_earth |
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117 | if (cosfactp.lt.cosfactm) then |
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118 | hzone=sqrt(r_earth**2-cosfactp**2)- & |
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119 | sqrt(r_earth**2-cosfactm**2) |
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120 | else |
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121 | hzone=sqrt(r_earth**2-cosfactm**2)- & |
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122 | sqrt(r_earth**2-cosfactp**2) |
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123 | endif |
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124 | endif |
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125 | gridarea(jy)=2.*pi*r_earth*hzone*dx/360. |
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126 | end do |
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127 | |
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128 | ! Do the same for the south pole |
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129 | |
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130 | if (sglobal) then |
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131 | ylat=ylat0 |
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132 | ylatp=ylat+0.5*dy |
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133 | ylatm=ylat |
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134 | cosfactm=0. |
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135 | cosfactp=cos(ylatp*pih)*r_earth |
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136 | hzone=sqrt(r_earth**2-cosfactm**2)- & |
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137 | sqrt(r_earth**2-cosfactp**2) |
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138 | gridarea(0)=2.*pi*r_earth*hzone*dx/360. |
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139 | endif |
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140 | |
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141 | ! Do the same for the north pole |
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142 | |
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143 | if (nglobal) then |
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144 | ylat=ylat0+real(nymin1)*dy |
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145 | ylatp=ylat |
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146 | ylatm=ylat-0.5*dy |
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147 | cosfactp=0. |
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148 | cosfactm=cos(ylatm*pih)*r_earth |
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149 | hzone=sqrt(r_earth**2-cosfactp**2)- & |
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150 | sqrt(r_earth**2-cosfactm**2) |
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151 | gridarea(nymin1)=2.*pi*r_earth*hzone*dx/360. |
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152 | endif |
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153 | |
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154 | |
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155 | ! Calculate total mass of each grid column and of the whole atmosphere |
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156 | !********************************************************************* |
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157 | |
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158 | colmasstotal=0. |
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159 | do jy=ny_sn(1),ny_sn(2) ! loop about latitudes |
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160 | do ix=nx_we(1),nx_we(2) ! loop about longitudes |
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161 | pp(1)=rho(ix,jy,1,1)*r_air*tt(ix,jy,1,1) |
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162 | pp(nz)=rho(ix,jy,nz,1)*r_air*tt(ix,jy,nz,1) |
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163 | ! Each MPI process is assigned an equal share of particles |
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164 | colmass(ix,jy)=(pp(1)-pp(nz))/ga*gridarea(jy)/mp_partgroup_np |
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165 | colmasstotal=colmasstotal+colmass(ix,jy) |
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166 | |
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167 | end do |
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168 | end do |
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169 | |
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170 | if (lroot) write(*,*) 'Atm. mass: ',colmasstotal |
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171 | |
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172 | |
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173 | if (ipin.eq.0) numpart=0 |
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174 | |
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175 | ! Determine the particle positions |
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176 | !********************************* |
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177 | |
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178 | numparttot=0 |
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179 | numcolumn=0 |
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180 | do jy=ny_sn(1),ny_sn(2) ! loop about latitudes |
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181 | ylat=ylat0+real(jy)*dy |
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182 | do ix=nx_we(1),nx_we(2) ! loop about longitudes |
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183 | ncolumn=nint(0.999*real(npart(1)/mp_partgroup_np)*colmass(ix,jy)/ & |
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184 | colmasstotal) |
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185 | if (ncolumn.eq.0) goto 30 |
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186 | if (ncolumn.gt.numcolumn) numcolumn=ncolumn |
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187 | |
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188 | ! Calculate pressure at the altitudes of model surfaces, using the air density |
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189 | ! information, which is stored as a 3-d field |
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190 | !***************************************************************************** |
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191 | |
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192 | do kz=1,nz |
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193 | pp(kz)=rho(ix,jy,kz,1)*r_air*tt(ix,jy,kz,1) |
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194 | end do |
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195 | |
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196 | |
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197 | deltacol=(pp(1)-pp(nz))/real(ncolumn) |
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198 | pnew=pp(1)+deltacol/2. |
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199 | jj=0 |
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200 | do j=1,ncolumn |
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201 | jj=jj+1 |
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202 | |
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203 | |
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204 | ! For columns with many particles (i.e. around the equator), distribute |
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205 | ! the particles equally, for columns with few particles (i.e. around the |
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206 | ! poles), distribute the particles randomly |
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207 | !*********************************************************************** |
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208 | |
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209 | |
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210 | if (ncolumn.gt.20) then |
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211 | pnew=pnew-deltacol |
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212 | else |
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213 | pnew=pp(1)-ran1(idummy)*(pp(1)-pp(nz)) |
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214 | endif |
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215 | |
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216 | do kz=1,nz-1 |
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217 | if ((pp(kz).ge.pnew).and.(pp(kz+1).lt.pnew)) then |
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218 | dz1=pp(kz)-pnew |
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219 | dz2=pnew-pp(kz+1) |
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220 | dz=1./(dz1+dz2) |
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221 | |
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222 | ! Assign particle position |
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223 | !************************* |
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224 | ! Do the following steps only if particles are not read in from previous model run |
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225 | !***************************************************************************** |
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226 | if (ipin.eq.0) then |
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227 | xtra1(numpart+jj)=real(ix)-0.5+ran1(idummy) |
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228 | if (ix.eq.0) xtra1(numpart+jj)=ran1(idummy) |
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229 | if (ix.eq.nxmin1) xtra1(numpart+jj)= & |
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230 | real(nxmin1)-ran1(idummy) |
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231 | ytra1(numpart+jj)=real(jy)-0.5+ran1(idummy) |
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232 | ztra1(numpart+jj)=(height(kz)*dz2+height(kz+1)*dz1)*dz |
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233 | if (ztra1(numpart+jj).gt.height(nz)-0.5) & |
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234 | ztra1(numpart+jj)=height(nz)-0.5 |
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235 | |
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236 | |
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237 | ! Interpolate PV to the particle position |
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238 | !**************************************** |
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239 | ixm=int(xtra1(numpart+jj)) |
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240 | jym=int(ytra1(numpart+jj)) |
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241 | ixp=ixm+1 |
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242 | jyp=jym+1 |
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243 | ddx=xtra1(numpart+jj)-real(ixm) |
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244 | ddy=ytra1(numpart+jj)-real(jym) |
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245 | rddx=1.-ddx |
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246 | rddy=1.-ddy |
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247 | p1=rddx*rddy |
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248 | p2=ddx*rddy |
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249 | p3=rddx*ddy |
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250 | p4=ddx*ddy |
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251 | do i=2,nz |
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252 | if (height(i).gt.ztra1(numpart+jj)) then |
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253 | indzm=i-1 |
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254 | indzp=i |
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255 | goto 6 |
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256 | endif |
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257 | end do |
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258 | 6 continue |
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259 | dz1=ztra1(numpart+jj)-height(indzm) |
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260 | dz2=height(indzp)-ztra1(numpart+jj) |
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261 | dz=1./(dz1+dz2) |
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262 | do in=1,2 |
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263 | indzh=indzm+in-1 |
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264 | y1(in)=p1*pv(ixm,jym,indzh,1) & |
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265 | +p2*pv(ixp,jym,indzh,1) & |
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266 | +p3*pv(ixm,jyp,indzh,1) & |
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267 | +p4*pv(ixp,jyp,indzh,1) |
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268 | end do |
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269 | pvpart=(dz2*y1(1)+dz1*y1(2))*dz |
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270 | if (ylat.lt.0.) pvpart=-1.*pvpart |
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271 | |
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272 | |
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273 | ! For domain-filling option 2 (stratospheric O3), do the rest only in the stratosphere |
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274 | !***************************************************************************** |
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275 | |
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276 | if (((ztra1(numpart+jj).gt.3000.).and. & |
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277 | (pvpart.gt.pvcrit)).or.(mdomainfill.eq.1)) then |
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278 | |
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279 | ! Assign certain properties to the particle |
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280 | !****************************************** |
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281 | nclass(numpart+jj)=min(int(ran1(idummy)* & |
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282 | real(nclassunc))+1,nclassunc) |
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283 | numparticlecount=numparticlecount+1 |
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284 | npoint(numpart+jj)=numparticlecount |
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285 | idt(numpart+jj)=mintime |
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286 | itra1(numpart+jj)=0 |
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287 | itramem(numpart+jj)=0 |
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288 | itrasplit(numpart+jj)=itra1(numpart+jj)+ldirect* & |
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289 | itsplit |
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290 | xmass1(numpart+jj,1)=colmass(ix,jy)/real(ncolumn) |
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291 | if (mdomainfill.eq.2) xmass1(numpart+jj,1)= & |
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292 | xmass1(numpart+jj,1)*pvpart*48./29.*ozonescale/10.**9 |
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293 | else |
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294 | jj=jj-1 |
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295 | endif |
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296 | endif |
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297 | endif |
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298 | end do |
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299 | end do |
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300 | numparttot=numparttot+ncolumn |
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301 | if (ipin.eq.0) numpart=numpart+jj |
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302 | 30 continue |
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303 | end do |
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304 | end do |
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305 | |
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306 | |
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307 | ! Check whether numpart is really smaller than maxpart |
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308 | !***************************************************** |
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309 | |
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310 | if (numpart.gt.maxpart) then |
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311 | write(*,*) 'numpart too large: change source in init_atm_mass.f' |
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312 | write(*,*) 'numpart: ',numpart,' maxpart: ',maxpart |
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313 | endif |
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314 | |
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315 | |
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316 | xmassperparticle=colmasstotal/real(numparttot) |
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317 | |
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318 | |
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319 | ! Make sure that all particles are within domain |
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320 | !*********************************************** |
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321 | |
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322 | do j=1,numpart |
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323 | if ((xtra1(j).lt.0.).or.(xtra1(j).ge.real(nxmin1)).or. & |
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324 | (ytra1(j).lt.0.).or.(ytra1(j).ge.real(nymin1))) then |
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325 | itra1(j)=-999999999 |
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326 | endif |
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327 | end do |
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328 | |
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329 | |
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330 | |
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331 | |
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332 | ! For boundary conditions, we need fewer particle release heights per column, |
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333 | ! because otherwise it takes too long until enough mass has accumulated to |
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334 | ! release a particle at the boundary (would take dx/u seconds), leading to |
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335 | ! relatively large position errors of the order of one grid distance. |
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336 | ! It's better to release fewer particles per column, but to do so more often. |
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337 | ! Thus, use on the order of nz starting heights per column. |
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338 | ! We thus repeat the above to determine fewer starting heights, that are |
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339 | ! used furtheron in subroutine boundcond_domainfill.f. |
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340 | !**************************************************************************** |
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341 | |
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342 | fractus=real(numcolumn)/real(nz) |
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343 | write(*,*) 'Total number of particles at model start: ',numpart*mp_partgroup_np |
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344 | write(*,*) 'Maximum number of particles per column: ',numcolumn*mp_partgroup_np |
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345 | write(*,*) 'If ',fractus*mp_partgroup_np,' <1, better use more particles' |
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346 | fractus=sqrt(max(fractus,1.))/2. |
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347 | |
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348 | do jy=ny_sn(1),ny_sn(2) ! loop about latitudes |
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349 | do ix=nx_we(1),nx_we(2) ! loop about longitudes |
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350 | ncolumn=nint(0.999/fractus*real(npart(1)/mp_partgroup_np)*colmass(ix,jy) & |
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351 | /colmasstotal) |
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352 | if (ncolumn.gt.maxcolumn) stop 'maxcolumn too small' |
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353 | if (ncolumn.eq.0) goto 80 |
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354 | |
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355 | |
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356 | ! Memorize how many particles per column shall be used for all boundaries |
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357 | ! This is further used in subroutine boundcond_domainfill.f |
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358 | ! Use 2 fields for west/east and south/north boundary |
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359 | !************************************************************************ |
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360 | |
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361 | if (ix.eq.nx_we(1)) numcolumn_we(1,jy)=ncolumn |
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362 | if (ix.eq.nx_we(2)) numcolumn_we(2,jy)=ncolumn |
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363 | if (jy.eq.ny_sn(1)) numcolumn_sn(1,ix)=ncolumn |
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364 | if (jy.eq.ny_sn(2)) numcolumn_sn(2,ix)=ncolumn |
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365 | |
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366 | ! Calculate pressure at the altitudes of model surfaces, using the air density |
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367 | ! information, which is stored as a 3-d field |
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368 | !***************************************************************************** |
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369 | |
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370 | do kz=1,nz |
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371 | pp(kz)=rho(ix,jy,kz,1)*r_air*tt(ix,jy,kz,1) |
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372 | end do |
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373 | |
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374 | ! Determine the reference starting altitudes |
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375 | !******************************************* |
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376 | |
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377 | deltacol=(pp(1)-pp(nz))/real(ncolumn) |
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378 | pnew=pp(1)+deltacol/2. |
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379 | do j=1,ncolumn |
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380 | pnew=pnew-deltacol |
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381 | do kz=1,nz-1 |
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382 | if ((pp(kz).ge.pnew).and.(pp(kz+1).lt.pnew)) then |
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383 | dz1=pp(kz)-pnew |
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384 | dz2=pnew-pp(kz+1) |
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385 | dz=1./(dz1+dz2) |
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386 | zposition=(height(kz)*dz2+height(kz+1)*dz1)*dz |
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387 | if (zposition.gt.height(nz)-0.5) zposition=height(nz)-0.5 |
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388 | |
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389 | ! Memorize vertical positions where particles are introduced |
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390 | ! This is further used in subroutine boundcond_domainfill.f |
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391 | !*********************************************************** |
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392 | |
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393 | if (ix.eq.nx_we(1)) zcolumn_we(1,jy,j)=zposition |
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394 | if (ix.eq.nx_we(2)) zcolumn_we(2,jy,j)=zposition |
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395 | if (jy.eq.ny_sn(1)) zcolumn_sn(1,ix,j)=zposition |
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396 | if (jy.eq.ny_sn(2)) zcolumn_sn(2,ix,j)=zposition |
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397 | |
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398 | ! Initialize mass that has accumulated at boundary to zero |
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399 | !********************************************************* |
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400 | |
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401 | acc_mass_we(1,jy,j)=0. |
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402 | acc_mass_we(2,jy,j)=0. |
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403 | acc_mass_sn(1,jy,j)=0. |
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404 | acc_mass_sn(2,jy,j)=0. |
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405 | endif |
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406 | end do |
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407 | end do |
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408 | 80 continue |
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409 | end do |
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410 | end do |
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411 | |
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412 | ! If particles shall be read in to continue an existing run, |
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413 | ! then the accumulated masses at the domain boundaries must be read in, too. |
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414 | ! This overrides any previous calculations. |
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415 | !*************************************************************************** |
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416 | |
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417 | ! :TODO: eso: parallelize |
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418 | if (ipin.eq.1) then |
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419 | open(unitboundcond,file=path(2)(1:length(2))//'boundcond.bin', & |
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420 | form='unformatted') |
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421 | read(unitboundcond) numcolumn_we,numcolumn_sn, & |
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422 | zcolumn_we,zcolumn_sn,acc_mass_we,acc_mass_sn |
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423 | close(unitboundcond) |
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424 | endif |
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425 | |
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426 | |
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427 | |
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428 | |
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429 | end subroutine init_domainfill |
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