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 initial_cond_calc(itime,i) |
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23 | ! i i |
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24 | !***************************************************************************** |
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25 | ! * |
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26 | ! Calculation of the sensitivity to initial conditions for BW runs * |
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27 | ! * |
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28 | ! Author: A. Stohl * |
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29 | ! * |
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30 | ! 15 January 2010 * |
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31 | ! * |
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32 | !***************************************************************************** |
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33 | |
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34 | use unc_mod |
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35 | use outg_mod |
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36 | use par_mod |
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37 | use com_mod |
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38 | |
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39 | implicit none |
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40 | |
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41 | integer :: itime,i,ix,jy,ixp,jyp,kz,ks |
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42 | integer :: il,ind,indz,indzp,nrelpointer |
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43 | real :: rddx,rddy,p1,p2,p3,p4,dz1,dz2,dz |
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44 | real :: ddx,ddy |
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45 | real :: rhoprof(2),rhoi,xl,yl,wx,wy,w |
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46 | integer :: mind2 |
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47 | ! mind2 eso: pointer to 2nd windfield in memory |
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48 | |
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49 | |
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50 | ! For forward simulations, make a loop over the number of species; |
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51 | ! for backward simulations, make an additional loop over the release points |
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52 | !************************************************************************** |
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53 | |
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54 | |
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55 | if (itra1(i).ne.itime) return |
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56 | |
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57 | ! Depending on output option, calculate air density or set it to 1 |
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58 | ! linit_cond: 1=mass unit, 2=mass mixing ratio unit |
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59 | !***************************************************************** |
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60 | |
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61 | |
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62 | if (linit_cond.eq.1) then ! mass unit |
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63 | |
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64 | ix=int(xtra1(i)) |
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65 | jy=int(ytra1(i)) |
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66 | ixp=ix+1 |
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67 | jyp=jy+1 |
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68 | ddx=xtra1(i)-real(ix) |
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69 | ddy=ytra1(i)-real(jy) |
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70 | rddx=1.-ddx |
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71 | rddy=1.-ddy |
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72 | p1=rddx*rddy |
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73 | p2=ddx*rddy |
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74 | p3=rddx*ddy |
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75 | p4=ddx*ddy |
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76 | |
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77 | do il=2,nz |
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78 | if (height(il).gt.ztra1(i)) then |
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79 | indz=il-1 |
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80 | indzp=il |
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81 | goto 6 |
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82 | endif |
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83 | end do |
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84 | 6 continue |
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85 | |
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86 | dz1=ztra1(i)-height(indz) |
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87 | dz2=height(indzp)-ztra1(i) |
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88 | dz=1./(dz1+dz2) |
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89 | |
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90 | ! Take density from 2nd wind field in memory (accurate enough, no time interpolation needed) |
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91 | !***************************************************************************** |
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92 | mind2=memind(2) |
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93 | |
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94 | do ind=indz,indzp |
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95 | rhoprof(ind-indz+1)=p1*rho(ix ,jy ,ind,mind2) & |
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96 | +p2*rho(ixp,jy ,ind,mind2) & |
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97 | +p3*rho(ix ,jyp,ind,mind2) & |
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98 | +p4*rho(ixp,jyp,ind,mind2) |
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99 | end do |
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100 | rhoi=(dz1*rhoprof(2)+dz2*rhoprof(1))*dz |
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101 | elseif (linit_cond.eq.2) then ! mass mixing ratio unit |
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102 | rhoi=1. |
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103 | endif |
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104 | |
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105 | |
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106 | !**************************************************************************** |
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107 | ! 1. Evaluate grid concentrations using a uniform kernel of bandwidths dx, dy |
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108 | !**************************************************************************** |
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109 | |
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110 | |
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111 | ! For backward simulations, look from which release point the particle comes from |
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112 | ! For domain-filling trajectory option, npoint contains a consecutive particle |
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113 | ! number, not the release point information. Therefore, nrelpointer is set to 1 |
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114 | ! for the domain-filling option. |
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115 | !***************************************************************************** |
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116 | |
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117 | if ((ioutputforeachrelease.eq.0).or.(mdomainfill.eq.1)) then |
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118 | nrelpointer=1 |
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119 | else |
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120 | nrelpointer=npoint(i) |
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121 | endif |
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122 | |
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123 | do kz=1,numzgrid ! determine height of cell |
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124 | if (outheight(kz).gt.ztra1(i)) goto 21 |
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125 | end do |
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126 | 21 continue |
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127 | if (kz.le.numzgrid) then ! inside output domain |
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128 | |
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129 | |
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130 | xl=(xtra1(i)*dx+xoutshift)/dxout |
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131 | yl=(ytra1(i)*dy+youtshift)/dyout |
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132 | ix=int(xl) |
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133 | if (xl.lt.0.) ix=ix-1 |
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134 | jy=int(yl) |
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135 | if (yl.lt.0.) jy=jy-1 |
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136 | |
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137 | |
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138 | ! If a particle is close to the domain boundary, do not use the kernel either |
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139 | !**************************************************************************** |
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140 | |
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141 | if ((xl.lt.0.5).or.(yl.lt.0.5).or. & |
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142 | (xl.gt.real(numxgrid-1)-0.5).or. & |
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143 | (yl.gt.real(numygrid-1)-0.5)) then ! no kernel, direct attribution to grid cell |
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144 | if ((ix.ge.0).and.(jy.ge.0).and.(ix.le.numxgrid-1).and. & |
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145 | (jy.le.numygrid-1)) then |
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146 | do ks=1,nspec |
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147 | init_cond(ix,jy,kz,ks,nrelpointer)= & |
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148 | init_cond(ix,jy,kz,ks,nrelpointer)+ & |
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149 | xmass1(i,ks)/rhoi |
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150 | end do |
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151 | endif |
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152 | |
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153 | else ! attribution via uniform kernel |
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154 | |
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155 | ddx=xl-real(ix) ! distance to left cell border |
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156 | ddy=yl-real(jy) ! distance to lower cell border |
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157 | if (ddx.gt.0.5) then |
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158 | ixp=ix+1 |
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159 | wx=1.5-ddx |
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160 | else |
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161 | ixp=ix-1 |
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162 | wx=0.5+ddx |
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163 | endif |
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164 | |
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165 | if (ddy.gt.0.5) then |
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166 | jyp=jy+1 |
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167 | wy=1.5-ddy |
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168 | else |
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169 | jyp=jy-1 |
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170 | wy=0.5+ddy |
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171 | endif |
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172 | |
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173 | |
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174 | ! Determine mass fractions for four grid points |
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175 | !********************************************** |
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176 | |
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177 | if ((ix.ge.0).and.(ix.le.numxgrid-1)) then |
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178 | if ((jy.ge.0).and.(jy.le.numygrid-1)) then |
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179 | w=wx*wy |
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180 | do ks=1,nspec |
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181 | init_cond(ix,jy,kz,ks,nrelpointer)= & |
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182 | init_cond(ix,jy,kz,ks,nrelpointer)+xmass1(i,ks)/rhoi*w |
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183 | end do |
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184 | endif |
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185 | |
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186 | if ((jyp.ge.0).and.(jyp.le.numygrid-1)) then |
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187 | w=wx*(1.-wy) |
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188 | do ks=1,nspec |
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189 | init_cond(ix,jyp,kz,ks,nrelpointer)= & |
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190 | init_cond(ix,jyp,kz,ks,nrelpointer)+xmass1(i,ks)/rhoi*w |
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191 | end do |
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192 | endif |
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193 | endif |
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194 | |
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195 | |
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196 | if ((ixp.ge.0).and.(ixp.le.numxgrid-1)) then |
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197 | if ((jyp.ge.0).and.(jyp.le.numygrid-1)) then |
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198 | w=(1.-wx)*(1.-wy) |
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199 | do ks=1,nspec |
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200 | init_cond(ixp,jyp,kz,ks,nrelpointer)= & |
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201 | init_cond(ixp,jyp,kz,ks,nrelpointer)+xmass1(i,ks)/rhoi*w |
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202 | end do |
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203 | endif |
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204 | |
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205 | if ((jy.ge.0).and.(jy.le.numygrid-1)) then |
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206 | w=(1.-wx)*wy |
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207 | do ks=1,nspec |
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208 | init_cond(ixp,jy,kz,ks,nrelpointer)= & |
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209 | init_cond(ixp,jy,kz,ks,nrelpointer)+xmass1(i,ks)/rhoi*w |
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210 | end do |
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211 | endif |
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212 | endif |
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213 | endif |
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214 | |
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215 | endif |
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216 | |
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217 | end subroutine initial_cond_calc |
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