| 1 | subroutine get_wetscav(itime,ltsample,loutnext,jpart,ks,grfraction,inc_count,blc_count,wetscav) |
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| 2 | ! i i i i i o o o o |
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| 3 | !***************************************************************************** |
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| 4 | ! * |
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| 5 | ! Calculation of wet deposition using the concept of scavenging coefficients.* |
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| 6 | ! For lack of detailed information, washout and rainout are jointly treated. * |
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| 7 | ! It is assumed that precipitation does not occur uniformly within the whole * |
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| 8 | ! grid cell, but that only a fraction of the grid cell experiences rainfall. * |
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| 9 | ! This fraction is parameterized from total cloud cover and rates of large * |
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| 10 | ! scale and convective precipitation. * |
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| 11 | ! * |
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| 12 | ! Author: A. Stohl * |
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| 13 | ! * |
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| 14 | ! 1 December 1996 * |
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| 15 | ! * |
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| 16 | ! Correction by Petra Seibert, Sept 2002: * |
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| 17 | ! use centred precipitation data for integration * |
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| 18 | ! Code may not be correct for decay of deposition! * |
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| 19 | ! * |
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| 20 | !***************************************************************************** |
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| 21 | ! * |
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| 22 | ! Variables: * |
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| 23 | ! cc [0-1] total cloud cover * |
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| 24 | ! convp [mm/h] convective precipitation rate * |
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| 25 | ! grfraction [0-1] fraction of grid, for which precipitation occurs * |
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| 26 | ! ix,jy indices of output grid cell for each particle * |
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| 27 | ! itime [s] actual simulation time [s] * |
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| 28 | ! jpart particle index * |
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| 29 | ! lfr, cfr area fraction covered by precipitation for large scale * |
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| 30 | ! and convective precipitation (dependent on prec. rate) * |
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| 31 | ! loutnext [s] time for which gridded deposition is next output * |
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| 32 | ! loutstep [s] interval at which gridded deposition is output * |
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| 33 | ! lsp [mm/h] large scale precipitation rate * |
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| 34 | ! ltsample [s] interval over which mass is deposited * |
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| 35 | ! prec [mm/h] precipitation rate in subgrid, where precipitation occurs* |
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| 36 | ! wetgrid accumulated deposited mass on output grid * |
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| 37 | ! wetscav scavenging coefficient * |
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| 38 | ! * |
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| 39 | ! Constants: * |
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| 40 | ! * |
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| 41 | !***************************************************************************** |
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| 42 | |
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| 43 | use point_mod |
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| 44 | use par_mod |
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| 45 | use com_mod |
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| 46 | |
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| 47 | implicit none |
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| 48 | |
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| 49 | integer :: jpart,itime,ltsample,loutnext,i,j,ix,jy |
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| 50 | integer :: ngrid,hz,il,interp_time, n |
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| 51 | integer(kind=1) :: clouds_v |
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| 52 | integer :: ks, kp |
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| 53 | integer(selected_int_kind(16)), dimension(nspec) :: blc_count, inc_count |
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| 54 | |
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| 55 | ! integer :: n1,n2, icbot,ictop, indcloud !TEST |
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| 56 | real :: S_i, act_temp, cl, cle ! in cloud scavenging |
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| 57 | real :: clouds_h ! cloud height for the specific grid point |
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| 58 | real :: xtn,ytn,lsp,convp,cc,grfraction(3),prec(3),wetscav,totprec |
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| 59 | real :: restmass |
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| 60 | real,parameter :: smallnum = tiny(0.0) ! smallest number that can be handled |
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| 61 | !save lfr,cfr |
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| 62 | |
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| 63 | real, parameter :: lfr(5) = (/ 0.5,0.65,0.8,0.9,0.95/) |
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| 64 | real, parameter :: cfr(5) = (/ 0.4,0.55,0.7,0.8,0.9 /) |
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| 65 | |
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| 66 | !ZHG aerosol below-cloud scavenging removal polynomial constants for rain and snow |
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| 67 | real, parameter :: bclr(6) = (/274.35758, 332839.59273, 226656.57259, 58005.91340, 6588.38582, 0.244984/) !rain (Laakso et al 2003) |
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| 68 | real, parameter :: bcls(6) = (/22.7, 0.0, 0.0, 1321.0, 381.0, 0.0/) !now (Kyro et al 2009) |
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| 69 | real :: frac_act, liq_frac, ice_frac, dquer_m |
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| 70 | |
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| 71 | real :: Si_dummy, wetscav_dummy |
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| 72 | logical :: readclouds_this_nest |
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| 73 | |
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| 74 | |
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| 75 | wetscav=0. |
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| 76 | |
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| 77 | ! Determine which nesting level to be used |
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| 78 | !***************************************** |
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| 79 | ngrid=0 |
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| 80 | do j=numbnests,1,-1 |
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| 81 | if ((xtra1(jpart).gt.xln(j)).and.(xtra1(jpart).lt.xrn(j)).and. & |
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| 82 | (ytra1(jpart).gt.yln(j)).and.(ytra1(jpart).lt.yrn(j))) then |
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| 83 | ngrid=j |
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| 84 | goto 23 |
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| 85 | endif |
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| 86 | end do |
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| 87 | 23 continue |
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| 88 | |
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| 89 | |
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| 90 | ! Determine nested grid coordinates |
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| 91 | !********************************** |
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| 92 | readclouds_this_nest=.false. |
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| 93 | |
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| 94 | if (ngrid.gt.0) then |
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| 95 | xtn=(xtra1(jpart)-xln(ngrid))*xresoln(ngrid) |
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| 96 | ytn=(ytra1(jpart)-yln(ngrid))*yresoln(ngrid) |
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| 97 | ix=int(xtn) |
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| 98 | jy=int(ytn) |
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| 99 | if (readclouds_nest(ngrid)) readclouds_this_nest=.true. |
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| 100 | else |
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| 101 | ix=int(xtra1(jpart)) |
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| 102 | jy=int(ytra1(jpart)) |
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| 103 | endif |
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| 104 | |
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| 105 | ! Interpolate large scale precipitation, convective precipitation and |
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| 106 | ! total cloud cover |
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| 107 | ! Note that interpolated time refers to itime-0.5*ltsample [PS] |
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| 108 | !******************************************************************** |
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| 109 | interp_time=nint(itime-0.5*ltsample) |
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| 110 | |
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| 111 | n=memind(2) |
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| 112 | if (abs(memtime(1)-interp_time).lt.abs(memtime(2)-interp_time)) & |
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| 113 | n=memind(1) |
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| 114 | |
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| 115 | if (ngrid.eq.0) then |
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| 116 | call interpol_rain(lsprec,convprec,tcc,nxmax,nymax, & |
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| 117 | 1,nx,ny,n,real(xtra1(jpart)),real(ytra1(jpart)),1, & |
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| 118 | memtime(1),memtime(2),interp_time,lsp,convp,cc) |
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| 119 | else |
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| 120 | call interpol_rain_nests(lsprecn,convprecn,tccn, & |
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| 121 | nxmaxn,nymaxn,1,maxnests,ngrid,nxn,nyn,n,xtn,ytn,1, & |
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| 122 | memtime(1),memtime(2),interp_time,lsp,convp,cc) |
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| 123 | endif |
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| 124 | |
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| 125 | ! If total precipitation is less than 0.01 mm/h - no scavenging occurs |
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| 126 | if ((lsp.lt.0.01).and.(convp.lt.0.01)) goto 20 |
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| 127 | |
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| 128 | ! get the level were the actual particle is in |
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| 129 | do il=2,nz |
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| 130 | if (height(il).gt.ztra1(jpart)) then |
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| 131 | hz=il-1 |
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| 132 | exit |
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| 133 | endif |
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| 134 | end do |
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| 135 | |
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| 136 | if (ngrid.eq.0) then |
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| 137 | clouds_v=clouds(ix,jy,hz,n) |
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| 138 | clouds_h=cloudsh(ix,jy,n) |
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| 139 | else |
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| 140 | clouds_v=cloudsn(ix,jy,hz,n,ngrid) |
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| 141 | clouds_h=cloudshn(ix,jy,n,ngrid) |
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| 142 | endif |
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| 143 | |
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| 144 | ! if there is no precipitation or the particle is above the clouds no |
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| 145 | ! scavenging is done |
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| 146 | |
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| 147 | if (clouds_v.le.1) goto 20 |
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| 148 | |
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| 149 | ! 1) Parameterization of the the area fraction of the grid cell where the |
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| 150 | ! precipitation occurs: the absolute limit is the total cloud cover, but |
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| 151 | ! for low precipitation rates, an even smaller fraction of the grid cell |
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| 152 | ! is used. Large scale precipitation occurs over larger areas than |
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| 153 | ! convective precipitation. |
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| 154 | !************************************************************************** |
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| 155 | |
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| 156 | if (lsp.gt.20.) then |
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| 157 | i=5 |
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| 158 | else if (lsp.gt.8.) then |
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| 159 | i=4 |
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| 160 | else if (lsp.gt.3.) then |
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| 161 | i=3 |
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| 162 | else if (lsp.gt.1.) then |
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| 163 | i=2 |
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| 164 | else |
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| 165 | i=1 |
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| 166 | endif |
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| 167 | |
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| 168 | if (convp.gt.20.) then |
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| 169 | j=5 |
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| 170 | else if (convp.gt.8.) then |
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| 171 | j=4 |
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| 172 | else if (convp.gt.3.) then |
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| 173 | j=3 |
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| 174 | else if (convp.gt.1.) then |
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| 175 | j=2 |
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| 176 | else |
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| 177 | j=1 |
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| 178 | endif |
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| 179 | |
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| 180 | |
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| 181 | !ZHG oct 2014 : Calculated for 1) both 2) lsp 3) convp - 2 and 3 not used removed by SE |
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| 182 | ! Tentatively differentiate the grfraction for lsp and convp for treating differently the two forms |
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| 183 | ! for now they are treated the same |
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| 184 | grfraction(1)=max(0.05,cc*(lsp*lfr(i)+convp*cfr(j))/(lsp+convp)) |
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| 185 | |
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| 186 | ! 2) Computation of precipitation rate in sub-grid cell |
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| 187 | !****************************************************** |
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| 188 | prec(1)=(lsp+convp)/grfraction(1) |
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| 189 | |
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| 190 | ! 3) Computation of scavenging coefficients for all species |
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| 191 | ! Computation of wet deposition |
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| 192 | !********************************************************** |
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| 193 | |
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| 194 | if (ngrid.gt.0) then |
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| 195 | act_temp=ttn(ix,jy,hz,n,ngrid) |
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| 196 | else |
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| 197 | act_temp=tt(ix,jy,hz,n) |
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| 198 | endif |
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| 199 | |
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| 200 | !*********************** |
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| 201 | ! BELOW CLOUD SCAVENGING |
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| 202 | !*********************** |
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| 203 | if (clouds_v.ge.4) then !below cloud |
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| 204 | |
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| 205 | ! For gas: if positive below-cloud parameters (A or B), and dquer<=0 |
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| 206 | !****************************************************************** |
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| 207 | if ((dquer(ks).le.0.).and.(weta_gas(ks).gt.0..or.wetb_gas(ks).gt.0.)) then |
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| 208 | blc_count(ks)=blc_count(ks)+1 |
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| 209 | wetscav=weta_gas(ks)*prec(1)**wetb_gas(ks) |
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| 210 | |
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| 211 | ! For aerosols: if positive below-cloud parameters (Crain/Csnow or B), and dquer>0 |
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| 212 | !********************************************************************************* |
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| 213 | else if ((dquer(ks).gt.0.).and.(crain_aero(ks).gt.0..or.csnow_aero(ks).gt.0.)) then |
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| 214 | blc_count(ks)=blc_count(ks)+1 |
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| 215 | |
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| 216 | !NIK 17.02.2015 |
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| 217 | ! For the calculation here particle size needs to be in meter and not um as dquer is |
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| 218 | ! changed in readreleases |
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| 219 | ! For particles larger than 10 um use the largest size defined in the parameterizations (10um) |
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| 220 | dquer_m=min(10.,dquer(ks))/1000000. !conversion from um to m |
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| 221 | |
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| 222 | ! Rain: |
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| 223 | if (act_temp .ge. 273. .and. crain_aero(ks).gt.0.) then |
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| 224 | |
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| 225 | ! ZHG 2014 : Particle RAIN scavenging coefficient based on Laakso et al 2003, |
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| 226 | ! the below-cloud scavenging (rain efficienty) parameter Crain (=crain_aero) from SPECIES file |
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| 227 | wetscav=crain_aero(ks)*10**(bclr(1)+(bclr(2)*(log10(dquer_m))**(-4))+ & |
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| 228 | & (bclr(3)*(log10(dquer_m))**(-3))+ (bclr(4)*(log10(dquer_m))**(-2))+& |
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| 229 | &(bclr(5)*(log10(dquer_m))**(-1))+bclr(6)* (prec(1))**(0.5)) |
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| 230 | |
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| 231 | ! Snow: |
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| 232 | elseif (act_temp .lt. 273. .and. csnow_aero(ks).gt.0.) then |
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| 233 | ! ZHG 2014 : Particle SNOW scavenging coefficient based on Kyro et al 2009, |
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| 234 | ! the below-cloud scavenging (Snow efficiency) parameter Csnow (=csnow_aero) from SPECIES file |
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| 235 | wetscav=csnow_aero(ks)*10**(bcls(1)+(bcls(2)*(log10(dquer_m))**(-4))+& |
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| 236 | &(bcls(3)*(log10(dquer_m))**(-3))+ (bcls(4)*(log10(dquer_m))**(-2))+& |
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| 237 | &(bcls(5)*(log10(dquer_m))**(-1))+ bcls(6)* (prec(1))**(0.5)) |
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| 238 | |
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| 239 | endif |
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| 240 | |
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| 241 | endif ! gas or particle |
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| 242 | ! endif ! positive below-cloud scavenging parameters given in Species file |
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| 243 | endif !end BELOW |
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| 244 | |
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| 245 | !******************** |
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| 246 | ! IN CLOUD SCAVENGING |
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| 247 | !******************** |
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| 248 | if (clouds_v.lt.4) then ! In-cloud |
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| 249 | ! NIK 13 may 2015: only do incloud if positive in-cloud scavenging parameters are |
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| 250 | ! given in species file, or if gas and positive Henry's constant |
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| 251 | if ((ccn_aero(ks).gt.0. .or. in_aero(ks).gt.0.).or.(henry(ks).gt.0.and.dquer(ks).le.0)) then |
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| 252 | inc_count(ks)=inc_count(ks)+1 |
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| 253 | ! if negative coefficients (turned off) set to zero for use in equation |
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| 254 | if (ccn_aero(ks).lt.0.) ccn_aero(ks)=0. |
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| 255 | if (in_aero(ks).lt.0.) in_aero(ks)=0. |
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| 256 | |
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| 257 | !ZHG 2015 Cloud liquid & ice water (CLWC+CIWC) from ECMWF |
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| 258 | ! nested fields |
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| 259 | if (ngrid.gt.0.and.readclouds_this_nest) then |
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| 260 | cl=ctwcn(ix,jy,n,ngrid)*(grfraction(1)/cc) |
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| 261 | else if (ngrid.eq.0.and.readclouds) then |
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| 262 | cl=ctwc(ix,jy,n)*(grfraction(1)/cc) |
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| 263 | else !parameterize cloudwater m2/m3 |
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| 264 | !ZHG updated parameterization of cloud water to better reproduce the values coming from ECMWF |
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| 265 | ! sec test |
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| 266 | ! cl=1E6*1E-7*prec(1)**0.3 !Sec GFS new |
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| 267 | cl=1E6*2E-7*prec(1)**0.36 !Sec ECMWF new, is also suitable for GFS |
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| 268 | ! cl=2E-7*prec(1)**0.36 !Andreas |
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| 269 | ! cl=1.6E-6*prec(1)**0.36 !Henrik |
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| 270 | endif |
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| 271 | |
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| 272 | !ZHG: Calculate the partition between liquid and water phase water. |
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| 273 | if (act_temp .le. 253.) then |
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| 274 | liq_frac=0 |
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| 275 | ice_frac=1 |
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| 276 | else if (act_temp .ge. 273.) then |
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| 277 | liq_frac=1 |
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| 278 | ice_frac=0 |
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| 279 | else |
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| 280 | ! sec bugfix after FLEXPART paper review, liq_frac was 1-liq_frac |
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| 281 | ! IP bugfix v10.4, calculate ice_frac and liq_frac |
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| 282 | ice_frac= ((act_temp-273.)/(273.-253.))**2. |
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| 283 | !liq_frac = 1-ice_frac !((act_temp-253.)/(273.-253.))**2. |
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| 284 | liq_frac=max(0.,1.-ice_frac) |
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| 285 | end if |
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| 286 | ! ZHG: Calculate the aerosol partition based on cloud phase and Ai and Bi |
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| 287 | ! frac_act = liq_frac*ccn_aero(ks) +(1-liq_frac)*in_aero(ks) |
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| 288 | ! IP, use ice_frac and liq_frac |
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| 289 | frac_act = liq_frac*ccn_aero(ks) + ice_frac*in_aero(ks) |
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| 290 | |
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| 291 | !ZHG Use the activated fraction and the liqid water to calculate the washout |
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| 292 | |
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| 293 | ! AEROSOL |
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| 294 | !******** |
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| 295 | if (dquer(ks).gt.0.) then |
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| 296 | S_i= frac_act/cl |
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| 297 | ! GAS |
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| 298 | !**** |
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| 299 | else |
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| 300 | cle=(1-cl)/(henry(ks)*(r_air/3500.)*act_temp)+cl |
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| 301 | S_i=1/cle |
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| 302 | endif ! gas or particle |
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| 303 | |
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| 304 | ! scavenging coefficient based on Hertel et al 1995 - using the S_i for either gas or aerosol |
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| 305 | !SEC wetscav fix, the cloud height is no longer needed, it gives wrong results |
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| 306 | wetscav=incloud_ratio*S_i*(prec(1)/3.6E6) |
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| 307 | endif ! positive in-cloud scavenging parameters given in Species file |
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| 308 | endif !incloud |
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| 309 | |
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| 310 | |
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| 311 | 20 continue |
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| 312 | |
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| 313 | end subroutine get_wetscav |
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