1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
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2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
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3 | |
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4 | subroutine getrc(nc,i,j,t,gr,rh,rr,rc) |
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5 | ! i i i i i i i o |
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6 | !***************************************************************************** |
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7 | ! * |
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8 | ! Calculation of the surface resistance according to the procedure given * |
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9 | ! in: * |
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10 | ! Wesely (1989): Parameterization of surface resistances to gaseous * |
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11 | ! dry deposition in regional-scale numerical models. * |
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12 | ! Atmos. Environ. 23, 1293-1304. * |
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13 | ! * |
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14 | ! * |
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15 | ! AUTHOR: Andreas Stohl, 19 May 1995 * |
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16 | ! * |
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17 | !***************************************************************************** |
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18 | ! * |
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19 | ! Variables: * |
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20 | ! * |
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21 | ! reldiff(maxspec) diffusivity of H2O/diffusivity of component i * |
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22 | ! gr [W/m2] global radiation * |
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23 | ! i index of seasonal category * |
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24 | ! j index of landuse class * |
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25 | ! ldep(maxspec) 1, if deposition shall be calculated for species i * |
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26 | ! nc actual number of chemical components * |
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27 | ! rcl(maxspec,5,8) [s/m] Lower canopy resistance * |
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28 | ! rgs(maxspec,5,8) [s/m] Ground resistance * |
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29 | ! rlu(maxspec,5,8) [s/m] Leaf cuticular resistance * |
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30 | ! rm(maxspec) [s/m] Mesophyll resistance * |
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31 | ! t [C] temperature * |
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32 | ! * |
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33 | !***************************************************************************** |
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34 | |
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35 | use par_mod |
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36 | use com_mod |
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37 | |
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38 | implicit none |
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39 | |
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40 | integer :: i,j,ic,nc |
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41 | real :: gr,rh,rr,t,rs,rsm,corr,rluc,rclc,rgsc,rdc,rluo |
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42 | real :: rc(maxspec) |
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43 | |
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44 | |
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45 | ! Compute stomatal resistance |
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46 | !**************************** |
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47 | ! Sabine Eckhardt, Dec 06: use 1E25 instead of 99999. for infinite res. |
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48 | |
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49 | if ((t.gt.0.).and.(t.lt.40.)) then |
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50 | rs=ri(i,j)*(1.+(200./(gr+0.1))**2)*(400./(t*(40.-t))) |
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51 | else |
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52 | rs=1.E25 |
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53 | ! rs=99999. |
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54 | endif |
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55 | |
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56 | |
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57 | ! Correct stomatal resistance for effect of dew and rain |
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58 | !******************************************************* |
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59 | |
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60 | if ((rh.gt.0.9).or.(rr.gt.0.)) rs=rs*3. |
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61 | |
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62 | ! Compute the lower canopy resistance |
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63 | !************************************ |
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64 | |
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65 | rdc=100.*(1.+1000./(gr+10.)) |
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66 | |
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67 | |
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68 | corr=1000.*exp(-1.*t-4.) |
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69 | do ic=1,nc |
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70 | if (reldiff(ic).gt.0.) then |
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71 | |
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72 | ! Compute combined stomatal and mesophyll resistance |
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73 | !*************************************************** |
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74 | |
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75 | rsm=rs*reldiff(ic)+rm(ic) |
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76 | |
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77 | ! Correct leaf cuticular, lower canopy and ground resistance |
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78 | !*********************************************************** |
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79 | |
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80 | rluc=rlu(ic,i,j)+corr |
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81 | rclc=rcl(ic,i,j)+corr |
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82 | rgsc=rgs(ic,i,j)+corr |
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83 | |
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84 | ! Correct leaf cuticular resistance for effect of dew and rain |
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85 | !************************************************************* |
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86 | |
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87 | if (rr.gt.0.) then |
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88 | rluo=1./(1./1000.+1./(3.*rluc)) |
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89 | rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo) |
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90 | else if (rh.gt.0.9) then |
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91 | rluo=1./(1./3000.+1./(3.*rluc)) |
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92 | rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo) |
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93 | endif |
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94 | |
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95 | ! Combine resistances to give total resistance |
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96 | !********************************************* |
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97 | |
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98 | rc(ic)=1./(1./rsm+1./rluc+1./(rdc+rclc)+1./(rac(i,j)+rgsc)) |
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99 | ! Sabine Eckhardt, Dec 06: avoid possible excessively high vdep |
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100 | if (rc(ic).lt.10.) rc(ic)=10. |
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101 | endif |
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102 | end do |
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103 | |
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104 | end subroutine getrc |
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