1 | subroutine getvdep(n,ix,jy,ust,temp,pa,L,gr,rh,rr,snow,vdepo) |
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2 | ! i i i i i i i i i i i o |
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3 | !***************************************************************************** |
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4 | ! * |
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5 | ! This routine calculates the dry deposition velocities. * |
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6 | ! * |
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7 | ! Author: A. Stohl * |
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8 | ! * |
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9 | ! 20 December 1996 * |
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10 | ! Sabine Eckhardt, Jan 07 * |
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11 | ! if the latitude is negative: add half a year to the julian day * |
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12 | ! * |
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13 | !***************************************************************************** |
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14 | ! * |
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15 | ! Variables: * |
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16 | ! gr [W/m2] global radiation * |
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17 | ! L [m] Obukhov length * |
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18 | ! nyl kinematic viscosity * |
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19 | ! pa [Pa] surface air pressure * |
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20 | ! ra [s/m] aerodynamic resistance * |
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21 | ! raquer [s/m] average aerodynamic resistance * |
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22 | ! rh [0-1] relative humidity * |
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23 | ! rhoa density of the air * |
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24 | ! rr [mm/h] precipitation rate * |
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25 | ! temp [K] 2m temperature * |
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26 | ! tc [C] 2m temperature * |
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27 | ! ust [m/s] friction velocity * |
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28 | ! snow [m of water equivalent] snow depth * |
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29 | ! xlanduse fractions of numclasS landuses for each model grid point * |
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30 | ! * |
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31 | !***************************************************************************** |
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32 | |
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33 | use par_mod |
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34 | use com_mod |
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35 | |
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36 | implicit none |
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37 | |
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38 | integer :: yyyymmdd,hhmmss,yyyy,mmdd,n,lseason,i,j,ix,jy |
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39 | real :: vdepo(maxspec),vd,rb(maxspec),rc(maxspec),raquer,ylat |
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40 | real :: raerod,ra,ust,temp,tc,pa,L,gr,rh,rr,myl,nyl,rhoa,diffh2o,snow |
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41 | real :: slanduse(numclass) |
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42 | real,parameter :: eps=1.e-5 |
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43 | real(kind=dp) :: jul |
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44 | |
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45 | ! Calculate month and determine the seasonal category |
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46 | !**************************************************** |
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47 | |
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48 | jul=bdate+real(wftime(n),kind=dp)/86400._dp |
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49 | |
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50 | ylat=jy*dy+ylat0 |
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51 | if (ylat.lt.0) then |
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52 | jul=jul+365/2 |
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53 | endif |
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54 | |
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55 | |
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56 | call caldate(jul,yyyymmdd,hhmmss) |
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57 | yyyy=yyyymmdd/10000 |
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58 | mmdd=yyyymmdd-10000*yyyy |
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59 | |
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60 | if ((ylat.gt.-20).and.(ylat.lt.20)) then |
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61 | mmdd=600 ! summer |
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62 | endif |
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63 | |
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64 | if ((mmdd.ge.1201).or.(mmdd.le.301)) then |
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65 | lseason=4 |
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66 | else if ((mmdd.ge.1101).or.(mmdd.le.331)) then |
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67 | lseason=3 |
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68 | else if ((mmdd.ge.401).and.(mmdd.le.515)) then |
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69 | lseason=5 |
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70 | else if ((mmdd.ge.516).and.(mmdd.le.915)) then |
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71 | lseason=1 |
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72 | else |
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73 | lseason=2 |
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74 | endif |
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75 | |
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76 | ! Calculate diffusivity of water vapor |
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77 | !************************************ |
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78 | diffh2o=2.11e-5*(temp/273.15)**1.94*(101325/pa) |
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79 | |
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80 | ! Conversion of temperature from K to C |
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81 | !************************************** |
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82 | |
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83 | tc=temp-273.15 |
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84 | |
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85 | ! Calculate dynamic viscosity |
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86 | !**************************** |
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87 | |
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88 | if (tc.lt.0) then |
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89 | myl=(1.718+0.0049*tc-1.2e-05*tc**2)*1.e-05 |
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90 | else |
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91 | myl=(1.718+0.0049*tc)*1.e-05 |
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92 | endif |
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93 | |
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94 | ! Calculate kinematic viscosity |
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95 | !****************************** |
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96 | |
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97 | rhoa=pa/(287.*temp) |
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98 | nyl=myl/rhoa |
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99 | |
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100 | |
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101 | ! 0. Set all deposition velocities zero |
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102 | !************************************** |
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103 | |
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104 | do i=1,nspec |
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105 | vdepo(i)=0. |
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106 | end do |
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107 | |
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108 | |
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109 | ! 1. Compute surface layer resistances rb |
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110 | !**************************************** |
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111 | |
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112 | call getrb(nspec,ust,nyl,diffh2o,reldiff,rb) |
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113 | |
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114 | ! change for snow |
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115 | do j=1,numclass |
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116 | if (snow.gt.0.001) then ! 10 mm |
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117 | if (j.eq.12) then |
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118 | slanduse(j)=1. |
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119 | else |
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120 | slanduse(j)=0. |
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121 | endif |
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122 | else |
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123 | slanduse(j)=xlanduse(ix,jy,j) |
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124 | endif |
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125 | end do |
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126 | |
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127 | raquer=0. |
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128 | do j=1,numclass ! loop over all landuse classes |
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129 | |
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130 | if (slanduse(j).gt.eps) then |
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131 | |
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132 | ! 2. Calculate aerodynamic resistance ra |
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133 | !*************************************** |
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134 | |
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135 | ra=raerod(L,ust,z0(j)) |
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136 | raquer=raquer+ra*slanduse(j) |
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137 | |
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138 | ! 3. Calculate surface resistance for gases |
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139 | !****************************************** |
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140 | |
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141 | call getrc(nspec,lseason,j,tc,gr,rh,rr,rc) |
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142 | |
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143 | ! 4. Calculate deposition velocities for gases and ... |
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144 | ! 5. ... sum deposition velocities for all landuse classes |
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145 | !********************************************************* |
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146 | |
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147 | do i=1,nspec |
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148 | if (reldiff(i).gt.0.) then |
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149 | if ((ra+rb(i)+rc(i)).gt.0.) then |
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150 | vd=1./(ra+rb(i)+rc(i)) |
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151 | else |
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152 | vd=9.999 |
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153 | endif |
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154 | vdepo(i)=vdepo(i)+vd*slanduse(j) |
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155 | endif |
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156 | end do |
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157 | endif |
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158 | end do |
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159 | |
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160 | |
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161 | ! 6. Calculate deposition velocities for particles |
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162 | !************************************************* |
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163 | |
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164 | call partdep(nspec,density,fract,schmi,vset,raquer,ust,nyl,vdepo) |
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165 | |
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166 | !if (debug_mode) then |
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167 | ! print*,'getvdep:188: vdepo=', vdepo |
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168 | !stop |
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169 | !endif |
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170 | |
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171 | ! 7. If no detailed parameterization available, take constant deposition |
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172 | ! velocity if that is available |
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173 | !*********************************************************************** |
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174 | |
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175 | do i=1,nspec |
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176 | if ((reldiff(i).lt.0.).and.(density(i).lt.0.).and. & |
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177 | (dryvel(i).gt.0.)) then |
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178 | vdepo(i)=dryvel(i) |
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179 | endif |
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180 | end do |
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181 | |
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182 | |
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183 | end subroutine getvdep |
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