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 wetdepo(itime,ltsample,loutnext) |
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23 | ! i i i |
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24 | !***************************************************************************** |
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25 | ! * |
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26 | ! Calculation of wet deposition using the concept of scavenging coefficients.* |
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27 | ! For lack of detailed information, washout and rainout are jointly treated. * |
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28 | ! It is assumed that precipitation does not occur uniformly within the whole * |
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29 | ! grid cell, but that only a fraction of the grid cell experiences rainfall. * |
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30 | ! This fraction is parameterized from total cloud cover and rates of large * |
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31 | ! scale and convective precipitation. * |
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32 | ! * |
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33 | ! Author: A. Stohl * |
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34 | ! * |
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35 | ! 1 December 1996 * |
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36 | ! * |
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37 | ! Correction by Petra Seibert, Sept 2002: * |
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38 | ! use centred precipitation data for integration * |
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39 | ! Code may not be correct for decay of deposition! * |
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40 | ! * |
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41 | !***************************************************************************** |
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42 | ! * |
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43 | ! Variables: * |
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44 | ! ix,jy indices of output grid cell for each particle * |
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45 | ! itime [s] actual simulation time [s] * |
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46 | ! jpart particle index * |
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47 | ! ldeltat [s] interval since radioactive decay was computed * |
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48 | ! loutnext [s] time for which gridded deposition is next output * |
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49 | ! loutstep [s] interval at which gridded deposition is output * |
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50 | ! ltsample [s] interval over which mass is deposited * |
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51 | ! wetdeposit mass that is wet deposited * |
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52 | ! wetgrid accumulated deposited mass on output grid * |
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53 | ! wetscav scavenging coefficient * |
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54 | ! * |
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55 | ! Constants: * |
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56 | ! * |
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57 | !***************************************************************************** |
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58 | |
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59 | use point_mod |
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60 | use par_mod |
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61 | use com_mod |
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62 | |
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63 | implicit none |
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64 | |
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65 | integer :: jpart,itime,ltsample,loutnext,ldeltat |
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66 | integer :: itage,nage |
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67 | integer :: ks, kp |
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68 | integer(selected_int_kind(16)), dimension(nspec) :: blc_count, inc_count |
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69 | real :: grfraction(3),wetscav |
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70 | real :: wetdeposit(maxspec),restmass |
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71 | real,parameter :: smallnum = tiny(0.0) ! smallest number that can be handled |
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72 | |
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73 | ! Compute interval since radioactive decay of deposited mass was computed |
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74 | !************************************************************************ |
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75 | |
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76 | if (itime.le.loutnext) then |
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77 | ldeltat=itime-(loutnext-loutstep) |
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78 | else ! first half of next interval |
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79 | ldeltat=itime-loutnext |
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80 | endif |
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81 | |
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82 | ! Loop over all particles |
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83 | !************************ |
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84 | |
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85 | blc_count(:)=0 |
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86 | inc_count(:)=0 |
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87 | |
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88 | do jpart=1,numpart |
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89 | |
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90 | if (itra1(jpart).eq.-999999999) goto 20 |
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91 | if(ldirect.eq.1)then |
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92 | if (itra1(jpart).gt.itime) goto 20 |
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93 | else |
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94 | if (itra1(jpart).lt.itime) goto 20 |
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95 | endif |
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96 | |
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97 | ! Determine age class of the particle - nage is used for the kernel |
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98 | !****************************************************************** |
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99 | itage=abs(itra1(jpart)-itramem(jpart)) |
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100 | do nage=1,nageclass |
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101 | if (itage.lt.lage(nage)) goto 33 |
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102 | end do |
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103 | 33 continue |
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104 | |
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105 | do ks=1,nspec ! loop over species |
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106 | |
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107 | if (WETDEPSPEC(ks).eqv..false.) cycle |
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108 | |
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109 | !************************************************** |
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110 | ! CALCULATE DEPOSITION |
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111 | !************************************************** |
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112 | ! wetscav=0. |
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113 | |
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114 | ! write(*,*) ks,dquer(ks), crain_aero(ks),csnow_aero(ks) |
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115 | ! if (((dquer(ks).le.0.).and.(weta_gas(ks).gt.0..or.wetb_gas(ks).gt.0.)) & |
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116 | ! .or. & |
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117 | ! ((dquer(ks).gt.0.).and.(crain_aero(ks).gt.0..or.csnow_aero(ks).gt.0.).or. & |
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118 | ! (ccn_aero(ks).gt0) .or. (in_aero(ks).gt.0) .or. (henry(ks).gt.0))) then |
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119 | |
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120 | call get_wetscav(itime,ltsample,loutnext,jpart,ks,grfraction,inc_count,blc_count,wetscav) |
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121 | |
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122 | |
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123 | if (wetscav.gt.0.) then |
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124 | wetdeposit(ks)=xmass1(jpart,ks)* & |
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125 | (1.-exp(-wetscav*abs(ltsample)))*grfraction(1) ! wet deposition |
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126 | else ! if no scavenging |
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127 | wetdeposit(ks)=0. |
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128 | endif |
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129 | |
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130 | restmass = xmass1(jpart,ks)-wetdeposit(ks) |
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131 | if (ioutputforeachrelease.eq.1) then |
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132 | kp=npoint(jpart) |
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133 | else |
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134 | kp=1 |
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135 | endif |
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136 | if (restmass .gt. smallnum) then |
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137 | xmass1(jpart,ks)=restmass |
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138 | ! depostatistic |
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139 | ! wetdepo_sum(ks,kp)=wetdepo_sum(ks,kp)+wetdeposit(ks) |
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140 | ! depostatistic |
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141 | else |
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142 | xmass1(jpart,ks)=0. |
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143 | endif |
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144 | ! Correct deposited mass to the last time step when radioactive decay of |
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145 | ! gridded deposited mass was calculated |
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146 | if (decay(ks).gt.0.) then |
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147 | wetdeposit(ks)=wetdeposit(ks)*exp(abs(ldeltat)*decay(ks)) |
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148 | endif |
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149 | |
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150 | ! endif ! no deposition |
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151 | end do ! loop over species |
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152 | |
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153 | ! Sabine Eckhardt, June 2008 create deposition runs only for forward runs |
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154 | ! Add the wet deposition to accumulated amount on output grid and nested output grid |
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155 | !***************************************************************************** |
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156 | |
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157 | if (ldirect.eq.1) then |
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158 | call wetdepokernel(nclass(jpart),wetdeposit,real(xtra1(jpart)), & |
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159 | real(ytra1(jpart)),nage,kp) |
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160 | if (nested_output.eq.1) call wetdepokernel_nest(nclass(jpart), & |
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161 | wetdeposit,real(xtra1(jpart)),real(ytra1(jpart)),nage,kp) |
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162 | endif |
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163 | |
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164 | 20 continue |
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165 | end do ! all particles |
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166 | |
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167 | ! count the total number of below-cloud and in-cloud occurences: |
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168 | tot_blc_count(1:nspec)=tot_blc_count(1:nspec)+blc_count(1:nspec) |
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169 | tot_inc_count(1:nspec)=tot_inc_count(1:nspec)+inc_count(1:nspec) |
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170 | |
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171 | end subroutine wetdepo |
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