!********************************************************************** ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * ! * ! This file is part of FLEXPART. * ! * ! FLEXPART is free software: you can redistribute it and/or modify * ! it under the terms of the GNU General Public License as published by* ! the Free Software Foundation, either version 3 of the License, or * ! (at your option) any later version. * ! * ! FLEXPART is distributed in the hope that it will be useful, * ! but WITHOUT ANY WARRANTY; without even the implied warranty of * ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * ! GNU General Public License for more details. * ! * ! You should have received a copy of the GNU General Public License * ! along with FLEXPART. If not, see . * !********************************************************************** subroutine wetdepo(itime,ltsample,loutnext) ! i i i !***************************************************************************** ! * ! Calculation of wet deposition using the concept of scavenging coefficients.* ! For lack of detailed information, washout and rainout are jointly treated. * ! It is assumed that precipitation does not occur uniformly within the whole * ! grid cell, but that only a fraction of the grid cell experiences rainfall. * ! This fraction is parameterized from total cloud cover and rates of large * ! scale and convective precipitation. * ! * ! Author: A. Stohl * ! * ! 1 December 1996 * ! * ! Correction by Petra Seibert, Sept 2002: * ! use centred precipitation data for integration * ! Code may not be correct for decay of deposition! * ! * !***************************************************************************** ! * ! Variables: * ! cc [0-1] total cloud cover * ! convp [mm/h] convective precipitation rate * ! grfraction [0-1] fraction of grid, for which precipitation occurs * ! ix,jy indices of output grid cell for each particle * ! itime [s] actual simulation time [s] * ! jpart particle index * ! ldeltat [s] interval since radioactive decay was computed * ! lfr, cfr area fraction covered by precipitation for large scale * ! and convective precipitation (dependent on prec. rate) * ! loutnext [s] time for which gridded deposition is next output * ! loutstep [s] interval at which gridded deposition is output * ! lsp [mm/h] large scale precipitation rate * ! ltsample [s] interval over which mass is deposited * ! prec [mm/h] precipitation rate in subgrid, where precipitation occurs* ! wetdeposit mass that is wet deposited * ! wetgrid accumulated deposited mass on output grid * ! wetscav scavenging coefficient * ! * ! Constants: * ! * !***************************************************************************** use point_mod use par_mod use com_mod implicit none integer :: jpart,itime,ltsample,loutnext,ldeltat,i,j,ix,jy integer :: ngrid,itage,nage,hz,il,interp_time, n, clouds_v integer :: ks, kp real :: S_i, act_temp, cl, cle ! in cloud scavenging real :: clouds_h ! cloud height for the specific grid point real :: xtn,ytn,lsp,convp,cc,grfraction,prec,wetscav real :: wetdeposit(maxspec),restmass real,parameter :: smallnum = tiny(0.0) ! smallest number that can be handled save lfr,cfr real :: lfr(5) = (/ 0.5,0.65,0.8,0.9,0.95/) real :: cfr(5) = (/ 0.4,0.55,0.7,0.8,0.9 /) ! Compute interval since radioactive decay of deposited mass was computed !************************************************************************ if (itime.le.loutnext) then ldeltat=itime-(loutnext-loutstep) else ! first half of next interval ldeltat=itime-loutnext endif ! Loop over all particles !************************ do jpart=1,numpart if (itra1(jpart).eq.-999999999) goto 20 if(ldirect.eq.1)then if (itra1(jpart).gt.itime) goto 20 else if (itra1(jpart).lt.itime) goto 20 endif ! Determine age class of the particle itage=abs(itra1(jpart)-itramem(jpart)) do nage=1,nageclass if (itage.lt.lage(nage)) goto 33 end do 33 continue ! Determine which nesting level to be used !***************************************** ngrid=0 do j=numbnests,1,-1 if ((xtra1(jpart).gt.xln(j)).and.(xtra1(jpart).lt.xrn(j)).and. & (ytra1(jpart).gt.yln(j)).and.(ytra1(jpart).lt.yrn(j))) then ngrid=j goto 23 endif end do 23 continue ! Determine nested grid coordinates !********************************** if (ngrid.gt.0) then xtn=(xtra1(jpart)-xln(ngrid))*xresoln(ngrid) ytn=(ytra1(jpart)-yln(ngrid))*yresoln(ngrid) ix=int(xtn) jy=int(ytn) else ix=int(xtra1(jpart)) jy=int(ytra1(jpart)) endif ! Interpolate large scale precipitation, convective precipitation and ! total cloud cover ! Note that interpolated time refers to itime-0.5*ltsample [PS] !******************************************************************** interp_time=nint(itime-0.5*ltsample) if (ngrid.eq.0) then call interpol_rain(lsprec,convprec,tcc,nxmax,nymax, & 1,nx,ny,memind,real(xtra1(jpart)),real(ytra1(jpart)),1, & memtime(1),memtime(2),interp_time,lsp,convp,cc) else call interpol_rain_nests(lsprecn,convprecn,tccn, & nxmaxn,nymaxn,1,maxnests,ngrid,nxn,nyn,memind,xtn,ytn,1, & memtime(1),memtime(2),interp_time,lsp,convp,cc) endif if ((lsp.lt.0.01).and.(convp.lt.0.01)) goto 20 ! get the level were the actual particle is in do il=2,nz if (height(il).gt.ztra1(jpart)) then hz=il-1 goto 26 endif end do 26 continue n=memind(2) if (abs(memtime(1)-interp_time).lt.abs(memtime(2)-interp_time)) & n=memind(1) ! if there is no precipitation or the particle is above the clouds no ! scavenging is done if (ngrid.eq.0) then clouds_v=clouds(ix,jy,hz,n) clouds_h=cloudsh(ix,jy,n) else clouds_v=cloudsn(ix,jy,hz,n,ngrid) clouds_h=cloudsnh(ix,jy,n,ngrid) endif !write(*,*) 'there is ! + precipitation',(clouds(ix,jy,ihz,n),ihz=1,20),lsp,convp,hz if (clouds_v.le.1) goto 20 !write (*,*) 'there is scavenging' ! 1) Parameterization of the the area fraction of the grid cell where the ! precipitation occurs: the absolute limit is the total cloud cover, but ! for low precipitation rates, an even smaller fraction of the grid cell ! is used. Large scale precipitation occurs over larger areas than ! convective precipitation. !************************************************************************** if (lsp.gt.20.) then i=5 else if (lsp.gt.8.) then i=4 else if (lsp.gt.3.) then i=3 else if (lsp.gt.1.) then i=2 else i=1 endif if (convp.gt.20.) then j=5 else if (convp.gt.8.) then j=4 else if (convp.gt.3.) then j=3 else if (convp.gt.1.) then j=2 else j=1 endif grfraction=max(0.05,cc*(lsp*lfr(i)+convp*cfr(j))/(lsp+convp)) ! 2) Computation of precipitation rate in sub-grid cell !****************************************************** prec=(lsp+convp)/grfraction ! 3) Computation of scavenging coefficients for all species ! Computation of wet deposition !********************************************************** do ks=1,nspec ! loop over species wetdeposit(ks)=0. wetscav=0. ! NIK 09.12.13: allowed to turn off either below cloud or in-cloud by including TWO separate blocks of if tests !****i******************* ! BELOW CLOUD SCAVENGING !*********************** if (weta(ks).gt.0. .and. clouds_v.ge.4) then !if positive below-cloud coefficient given in SPECIES file, and if in below cloud regime ! for aerosols and not highliy soluble substances weta=5E-6 wetscav=weta(ks)*prec**wetb(ks) ! scavenging coefficient endif !end below-cloud !******************** ! IN CLOUD SCAVENGING !******************** if (weta_in(ks).gt.0. .and. clouds_v.lt.4) then !if positive in-cloud coefficient given in SPECIES file, and if in in-cloud regime if (ngrid.gt.0) then act_temp=ttn(ix,jy,hz,n,ngrid) else act_temp=tt(ix,jy,hz,n) endif ! NIK 31.01.2013: SPECIES defined parameters for the in-cloud scavening ! weta_in=2.0E-07 (default) ! wetb_in=0.36 (default) ! wetc_in=0.9 (default) ! wetd_in: Scaling factor for the total in-cloud scavenging (default 1.0-no scaling) cl=weta_in(ks)*prec**wetb_in(ks) if (dquer(ks).gt.0) then ! is particle S_i=wetc_in(ks)/cl else ! is gas cle=(1-cl)/(henry(ks)*(r_air/3500.)*act_temp)+cl S_i=1/cle endif wetscav=S_i*prec/3.6E6/clouds_h/wetd_in(ks) ! write(*,*) 'in. wetscav:' ! + ,wetscav,cle,cl,act_temp,prec,clouds_h endif ! end in-cloud !************************************************** ! CALCULATE DEPOSITION !************************************************** ! if (wetscav.le.0) write (*,*) 'neg, or 0 wetscav!' ! + ,wetscav,cle,cl,act_temp,prec,clouds_h,clouds_v if (wetscav.gt.0.) then wetdeposit(ks)=xmass1(jpart,ks)* & (1.-exp(-wetscav*abs(ltsample)))*grfraction ! wet deposition else ! if no scavenging wetdeposit(ks)=0. endif restmass = xmass1(jpart,ks)-wetdeposit(ks) if (ioutputforeachrelease.eq.1) then kp=npoint(jpart) else kp=1 endif if (restmass .gt. smallnum) then xmass1(jpart,ks)=restmass ! depostatistic ! wetdepo_sum(ks,kp)=wetdepo_sum(ks,kp)+wetdeposit(ks) ! depostatistic else xmass1(jpart,ks)=0. endif ! Correct deposited mass to the last time step when radioactive decay of ! gridded deposited mass was calculated if (decay(ks).gt.0.) then wetdeposit(ks)=wetdeposit(ks)*exp(abs(ldeltat)*decay(ks)) endif end do !all species ! Sabine Eckhardt, June 2008 create deposition runs only for forward runs ! Add the wet deposition to accumulated amount on output grid and nested output grid !***************************************************************************** if (ldirect.eq.1) then call wetdepokernel(nclass(jpart),wetdeposit,real(xtra1(jpart)), & real(ytra1(jpart)),nage,kp) if (nested_output.eq.1) call wetdepokernel_nest(nclass(jpart), & wetdeposit,real(xtra1(jpart)),real(ytra1(jpart)),nage,kp) endif 20 continue end do ! all particles end subroutine wetdepo