[e200b7a] | 1 | subroutine getrc(nc,i,j,t,gr,rh,rr,rc) |
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| 2 | ! i i i i i i i o |
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| 3 | !***************************************************************************** |
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| 4 | ! * |
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| 5 | ! Calculation of the surface resistance according to the procedure given * |
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| 6 | ! in: * |
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| 7 | ! Wesely (1989): Parameterization of surface resistances to gaseous * |
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| 8 | ! dry deposition in regional-scale numerical models. * |
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| 9 | ! Atmos. Environ. 23, 1293-1304. * |
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| 10 | ! * |
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| 11 | ! * |
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| 12 | ! AUTHOR: Andreas Stohl, 19 May 1995 * |
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| 13 | ! * |
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| 14 | !***************************************************************************** |
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| 15 | ! * |
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| 16 | ! Variables: * |
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| 17 | ! * |
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| 18 | ! reldiff(maxspec) diffusivity of H2O/diffusivity of component i * |
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| 19 | ! gr [W/m2] global radiation * |
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| 20 | ! i index of seasonal category * |
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| 21 | ! j index of landuse class * |
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| 22 | ! ldep(maxspec) 1, if deposition shall be calculated for species i * |
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| 23 | ! nc actual number of chemical components * |
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| 24 | ! rcl(maxspec,5,8) [s/m] Lower canopy resistance * |
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| 25 | ! rgs(maxspec,5,8) [s/m] Ground resistance * |
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| 26 | ! rlu(maxspec,5,8) [s/m] Leaf cuticular resistance * |
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| 27 | ! rm(maxspec) [s/m] Mesophyll resistance * |
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| 28 | ! t [C] temperature * |
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| 29 | ! * |
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| 30 | !***************************************************************************** |
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| 31 | |
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| 32 | use par_mod |
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| 33 | use com_mod |
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| 34 | |
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| 35 | implicit none |
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| 36 | |
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| 37 | integer :: i,j,ic,nc |
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| 38 | real :: gr,rh,rr,t,rs,rsm,corr,rluc,rclc,rgsc,rdc,rluo |
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| 39 | real :: rc(maxspec) |
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| 40 | |
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| 41 | |
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| 42 | ! Compute stomatal resistance |
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| 43 | !**************************** |
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| 44 | ! Sabine Eckhardt, Dec 06: use 1E25 instead of 99999. for infinite res. |
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| 45 | |
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| 46 | if ((t.gt.0.).and.(t.lt.40.)) then |
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| 47 | rs=ri(i,j)*(1.+(200./(gr+0.1))**2)*(400./(t*(40.-t))) |
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| 48 | else |
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| 49 | rs=1.E25 |
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| 50 | ! rs=99999. |
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| 51 | endif |
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| 52 | |
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| 53 | |
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| 54 | ! Correct stomatal resistance for effect of dew and rain |
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| 55 | !******************************************************* |
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| 56 | |
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| 57 | if ((rh.gt.0.9).or.(rr.gt.0.)) rs=rs*3. |
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| 58 | |
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| 59 | ! Compute the lower canopy resistance |
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| 60 | !************************************ |
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| 61 | |
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| 62 | rdc=100.*(1.+1000./(gr+10.)) |
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| 63 | |
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| 64 | |
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| 65 | corr=1000.*exp(-1.*t-4.) |
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| 66 | do ic=1,nc |
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| 67 | if (reldiff(ic).gt.0.) then |
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| 68 | |
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| 69 | ! Compute combined stomatal and mesophyll resistance |
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| 70 | !*************************************************** |
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| 71 | |
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| 72 | rsm=rs*reldiff(ic)+rm(ic) |
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| 73 | |
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| 74 | ! Correct leaf cuticular, lower canopy and ground resistance |
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| 75 | !*********************************************************** |
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| 76 | |
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| 77 | rluc=rlu(ic,i,j)+corr |
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| 78 | rclc=rcl(ic,i,j)+corr |
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| 79 | rgsc=rgs(ic,i,j)+corr |
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| 80 | |
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| 81 | ! Correct leaf cuticular resistance for effect of dew and rain |
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| 82 | !************************************************************* |
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| 83 | |
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| 84 | if (rr.gt.0.) then |
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| 85 | rluo=1./(1./1000.+1./(3.*rluc)) |
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| 86 | rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo) |
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| 87 | else if (rh.gt.0.9) then |
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| 88 | rluo=1./(1./3000.+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 | endif |
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| 91 | |
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| 92 | ! Combine resistances to give total resistance |
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| 93 | !********************************************* |
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| 94 | |
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| 95 | rc(ic)=1./(1./rsm+1./rluc+1./(rdc+rclc)+1./(rac(i,j)+rgsc)) |
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| 96 | ! Sabine Eckhardt, Dec 06: avoid possible excessively high vdep |
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| 97 | if (rc(ic).lt.10.) rc(ic)=10. |
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| 98 | endif |
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| 99 | end do |
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| 100 | |
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| 101 | end subroutine getrc |
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