| 1 | subroutine surfacearea(ngrid, nlay, naerkind, ptimestep, |
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| 2 | $ pplay, pzlay, |
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| 3 | $ pt, pq, pdq, nq, rdust, rice, tau, |
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| 4 | $ tauscaling, |
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| 5 | $ surfdust, surfice) |
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| 6 | |
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| 7 | use tracer_mod, only: nuice_sed, igcm_dust_number, |
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| 8 | & igcm_ccn_number, varian, ccn_factor |
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| 9 | use conc_mod, only: rnew |
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| 10 | USE comcstfi_h |
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| 11 | implicit none |
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| 12 | |
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| 13 | !========================================================================== |
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| 14 | ! calculation of the ice and dust surface area (m2/m3) |
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| 15 | ! available for heterogeneous reactions |
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| 16 | ! |
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| 17 | ! Franck Lefevre |
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| 18 | ! version 1.2 april 2012 |
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| 19 | !========================================================================== |
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| 20 | |
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| 21 | include "callkeys.h" |
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| 22 | |
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| 23 | ! input |
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| 24 | |
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| 25 | integer,intent(in) :: ngrid, nlay, naerkind |
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| 26 | integer,intent(in) :: nq ! number of tracers |
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| 27 | real,intent(in) :: ptimestep ! physics time step (s) |
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| 28 | real,intent(in) :: pplay(ngrid,nlay) ! pressure at mid-layers (Pa) |
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| 29 | real,intent(in) :: pzlay(ngrid,nlay) ! altitude at mid-layers (m) |
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| 30 | real,intent(in) :: pt(ngrid,nlay) ! temperature at mid-layers (K) |
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| 31 | real,intent(in) :: pq(ngrid,nlay,nq) ! tracers (kg/kg) |
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| 32 | real,intent(in) :: pdq(ngrid,nlay,nq) ! physical tendency (kg/kg.s-1) |
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| 33 | real,intent(in) :: rdust(ngrid,nlay) ! dust geometric mean radius (m) |
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| 34 | real,intent(in) :: rice(ngrid,nlay) ! ice mass mean radius (m) |
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| 35 | real,intent(in) :: tau(ngrid,naerkind) ! column dust optical depth at each point |
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| 36 | real,intent(in) :: tauscaling(ngrid) ! conversion factor for dust amount |
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| 37 | |
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| 38 | ! output |
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| 39 | |
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| 40 | real,intent(out) :: surfdust(ngrid,nlay) ! dust surface area (m2/m3) |
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| 41 | real,intent(out) :: surfice(ngrid,nlay) ! water-ice surface area (m2/m3) |
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| 42 | |
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| 43 | ! local |
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| 44 | |
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| 45 | integer :: l, ig |
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| 46 | real :: rho ! density (kg/m3) |
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| 47 | real :: dustnd, icend ! uodated dust and ice number densities (kg/kg) |
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| 48 | real, save :: factor_ice, factor_dust ! multiplying factor to compute total surface area |
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| 49 | ! from the mass-mean radius |
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| 50 | real :: sigma_ice, sigma_dust ! variance of the ice and dust distributions |
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| 51 | real :: ccntyp ! typical dust number density (#/kg) |
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| 52 | ! (microphys = false) |
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| 53 | real :: rdusttyp ! typical dust radius (m) |
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| 54 | ! (microphys = false) |
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| 55 | |
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| 56 | logical, save :: firstcall = .true. |
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| 57 | |
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| 58 | !========================================================================== |
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| 59 | |
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| 60 | if (firstcall) then ! compute the multiplying factors |
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| 61 | sigma_dust = varian |
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| 62 | sigma_ice = sqrt(log(nuice_sed + 1.)) |
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| 63 | factor_dust = exp(0.5*(log(sigma_dust))**2) |
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| 64 | factor_ice = exp(0.5*(log(sigma_ice))**2) |
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| 65 | write(*,*) 'surfacearea : factor_dust = ', factor_dust |
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| 66 | write(*,*) 'surfacearea : factor_ice = ', factor_ice |
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| 67 | firstcall = .false. |
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| 68 | end if |
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| 69 | |
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| 70 | if (microphys) then ! improvedclouds |
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| 71 | do l = 1,nlay |
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| 72 | do ig = 1,ngrid |
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| 73 | ! atmospheric density |
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| 74 | rho = pplay(ig,l)/(rnew(ig,l)*pt(ig,l)) |
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| 75 | ! updated dust number density |
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| 76 | dustnd = pq(ig,l,igcm_dust_number) |
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| 77 | $ + pdq(ig,l,igcm_dust_number)*ptimestep |
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| 78 | ! updated ice number density |
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| 79 | icend = pq(ig,l,igcm_ccn_number) |
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| 80 | $ + pdq(ig,l,igcm_ccn_number)*ptimestep |
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| 81 | ! dust surface area |
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| 82 | surfdust(ig,l) = factor_dust*dustnd*rho*tauscaling(ig) |
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| 83 | $ *4.*pi*rdust(ig,l)**2 |
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| 84 | ! ice surface area |
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| 85 | surfice(ig,l) = factor_ice*icend*rho*tauscaling(ig) |
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| 86 | $ *4.*pi*rice(ig,l)**2 |
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| 87 | end do |
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| 88 | end do |
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| 89 | else ! simpleclouds |
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| 90 | do l = 1,nlay |
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| 91 | do ig = 1,ngrid |
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| 92 | ! atmospheric density |
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| 93 | rho = pplay(ig,l)/(rnew(ig,l)*pt(ig,l)) |
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| 94 | ! typical dust radius |
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| 95 | rdusttyp = max(.8e-6*exp(-pzlay(ig,l)/18000.),1.e-9) |
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| 96 | ! typical dust number density |
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| 97 | ccntyp = 1.3e+8*max(tau(ig,1),0.001)/0.1 |
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| 98 | $ *exp(-pzlay(ig,l)/10000.) |
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| 99 | ccntyp = ccntyp/ccn_factor |
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| 100 | if (rice(ig,l) .gt. rdust(ig,l)) then |
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| 101 | surfdust(ig,l) = factor_dust*ccntyp*(ccn_factor - 1.) |
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| 102 | $ *rho*4.*pi*rdusttyp**2 |
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| 103 | surfice(ig,l) = factor_ice*ccntyp*4.*pi*rice(ig,l)**2 |
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| 104 | else |
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| 105 | surfdust(ig,l) = factor_dust*ccntyp*ccn_factor |
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| 106 | $ *rho*4.*pi*rdusttyp**2 |
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| 107 | surfice(ig,l) = 0. |
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| 108 | end if |
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| 109 | end do |
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| 110 | end do |
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| 111 | end if ! of microphys |
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| 112 | |
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| 113 | ! write diagnostics in micron2/cm3 |
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| 114 | |
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| 115 | if (callstats) then |
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| 116 | call wstats(ngrid,"surfdust", "Dust surface area", |
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| 117 | $ "micron2 cm-3",3,surfdust*1.e6) |
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| 118 | call wstats(ngrid,"surfice", "Ice cloud surface area", |
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| 119 | $ "micron2 cm-3",3,surfice*1.e6) |
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| 120 | endif |
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| 121 | call writediagfi(ngrid,"surfdust", "Dust surface area", |
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| 122 | $ "micron2 cm-3",3,surfdust*1.e6) |
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| 123 | call writediagfi(ngrid,"surfice", "Ice cloud surface area", |
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| 124 | $ "micron2 cm-3",3,surfice*1.e6) |
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| 125 | |
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| 126 | return |
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| 127 | end |
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