!********************************************************************** ! 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 calcpar(n,uuh,vvh,pvh) ! i i i o !***************************************************************************** ! * ! Computation of several boundary layer parameters needed for the * ! dispersion calculation and calculation of dry deposition velocities. * ! All parameters are calculated over the entire grid. * ! * ! Author: A. Stohl * ! * ! 21 May 1995 * ! * ! ------------------------------------------------------------------ * ! Petra Seibert, Feb 2000: * ! convection scheme: * ! new variables in call to richardson * ! * !***************************************************************************** ! Changes, Bernd C. Krueger, Feb. 2001: ! Variables tth and qvh (on eta coordinates) in common block !***************************************************************************** ! * ! Variables: * ! n temporal index for meteorological fields (1 to 3) * ! * ! Constants: * ! * ! * ! Functions: * ! scalev computation of ustar * ! obukhov computatio of Obukhov length * ! * !***************************************************************************** use par_mod use com_mod implicit none integer :: n,ix,jy,i,kz,lz,kzmin real :: ttlev(nuvzmax),qvlev(nuvzmax),obukhov,scalev,ol,hmixplus real :: ulev(nuvzmax),vlev(nuvzmax),ew,rh,vd(maxspec),subsceff,ylat real :: altmin,tvold,pold,zold,pint,tv,zlev(nuvzmax) real :: uuh(0:nxmax-1,0:nymax-1,nuvzmax) real :: vvh(0:nxmax-1,0:nymax-1,nuvzmax) real :: pvh(0:nxmax-1,0:nymax-1,nuvzmax) real,parameter :: const=r_air/ga !write(*,*) 'in calcpar writting snowheight' !*********************************** ! for test: write out snow depths ! open(4,file='slandusetest',form='formatted') ! do 5 ix=0,nxmin1 !5 write (4,*) (sd(ix,jy,1,n),jy=0,nymin1) ! close(4) ! Loop over entire grid !********************** do jy=0,nymin1 ! Set minimum height for tropopause !********************************** ylat=ylat0+real(jy)*dy if ((ylat.ge.-20.).and.(ylat.le.20.)) then altmin = 5000. else if ((ylat.gt.20.).and.(ylat.lt.40.)) then altmin=2500.+(40.-ylat)*125. else if ((ylat.gt.-40.).and.(ylat.lt.-20.)) then altmin=2500.+(40.+ylat)*125. else altmin=2500. endif endif do ix=0,nxmin1 ! 1) Calculation of friction velocity !************************************ ustar(ix,jy,1,n)=scalev(ps(ix,jy,1,n),tt2(ix,jy,1,n), & td2(ix,jy,1,n),surfstr(ix,jy,1,n)) if (ustar(ix,jy,1,n).le.1.e-8) ustar(ix,jy,1,n)=1.e-8 ! 2) Calculation of inverse Obukhov length scale !*********************************************** ol=obukhov(ps(ix,jy,1,n),tt2(ix,jy,1,n),td2(ix,jy,1,n), & tth(ix,jy,2,n),ustar(ix,jy,1,n),sshf(ix,jy,1,n),akm,bkm) if (ol.ne.0.) then oli(ix,jy,1,n)=1./ol else oli(ix,jy,1,n)=99999. endif ! 3) Calculation of convective velocity scale and mixing height !************************************************************** do i=1,nuvz ulev(i)=uuh(ix,jy,i) vlev(i)=vvh(ix,jy,i) ttlev(i)=tth(ix,jy,i,n) qvlev(i)=qvh(ix,jy,i,n) end do call richardson(ps(ix,jy,1,n),ustar(ix,jy,1,n),ttlev,qvlev, & ulev,vlev,nuvz,akz,bkz,sshf(ix,jy,1,n),tt2(ix,jy,1,n), & td2(ix,jy,1,n),hmix(ix,jy,1,n),wstar(ix,jy,1,n),hmixplus) if(lsubgrid.eq.1) then subsceff=min(excessoro(ix,jy),hmixplus) else subsceff=0.0 endif ! ! CALCULATE HMIX EXCESS ACCORDING TO SUBGRIDSCALE VARIABILITY AND STABILITY ! hmix(ix,jy,1,n)=hmix(ix,jy,1,n)+subsceff hmix(ix,jy,1,n)=max(hmixmin,hmix(ix,jy,1,n)) ! set minimum PBL height hmix(ix,jy,1,n)=min(hmixmax,hmix(ix,jy,1,n)) ! set maximum PBL height ! 4) Calculation of dry deposition velocities !******************************************** if (DRYDEP) then ! Sabine Eckhardt, Dec 06: use new index for z0 for water depending on ! windspeed z0(7)=0.016*ustar(ix,jy,1,n)*ustar(ix,jy,1,n)/ga ! Calculate relative humidity at surface !*************************************** rh=ew(td2(ix,jy,1,n))/ew(tt2(ix,jy,1,n)) call getvdep(n,ix,jy,ustar(ix,jy,1,n), & tt2(ix,jy,1,n),ps(ix,jy,1,n),1./oli(ix,jy,1,n), & ssr(ix,jy,1,n),rh,lsprec(ix,jy,1,n)+convprec(ix,jy,1,n), & sd(ix,jy,1,n),vd) do i=1,nspec vdep(ix,jy,i,n)=vd(i) end do endif !****************************************************** ! Calculate height of thermal tropopause (Hoinka, 1997) !****************************************************** ! 1) Calculate altitudes of ECMWF model levels !********************************************* tvold=tt2(ix,jy,1,n)*(1.+0.378*ew(td2(ix,jy,1,n))/ & ps(ix,jy,1,n)) pold=ps(ix,jy,1,n) zold=0. do kz=2,nuvz pint=akz(kz)+bkz(kz)*ps(ix,jy,1,n) ! pressure on model layers tv=tth(ix,jy,kz,n)*(1.+0.608*qvh(ix,jy,kz,n)) if (abs(tv-tvold).gt.0.2) then zlev(kz)=zold+const*log(pold/pint)*(tv-tvold)/log(tv/tvold) else zlev(kz)=zold+const*log(pold/pint)*tv endif tvold=tv pold=pint zold=zlev(kz) end do ! 2) Define a minimum level kzmin, from which upward the tropopause is ! searched for. This is to avoid inversions in the lower troposphere ! to be identified as the tropopause !************************************************************************ do kz=1,nuvz if (zlev(kz).ge.altmin) then kzmin=kz goto 45 endif end do 45 continue ! 3) Search for first stable layer above minimum height that fulfills the ! thermal tropopause criterion !************************************************************************ do kz=kzmin,nuvz do lz=kz+1,nuvz if ((zlev(lz)-zlev(kz)).gt.2000.) then if (((tth(ix,jy,kz,n)-tth(ix,jy,lz,n))/ & (zlev(lz)-zlev(kz))).lt.0.002) then tropopause(ix,jy,1,n)=zlev(kz) goto 51 endif goto 50 endif end do 50 continue end do 51 continue end do end do ! Calculation of potential vorticity on 3-d grid !*********************************************** call calcpv(n,uuh,vvh,pvh) end subroutine calcpar