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!**********************************************************************
! 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 <http://www.gnu.org/licenses/>. *
!**********************************************************************
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
!*****************************************************************************
! *
! CHANGE 17/11/2005 Caroline Forster NCEP GFS version *
! *
! 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,llev
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),hmixdummy
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
! 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
!***********************************************
! NCEP version: find first level above ground
llev = 0
do i=1,nuvz
if (ps(ix,jy,1,n).lt.akz(i)) llev=i
end do
llev = llev+1
if (llev.gt.nuvz) llev = nuvz-1
! NCEP version
! calculate inverse Obukhov length scale with tth(llev)
ol=obukhov(ps(ix,jy,1,n),tt2(ix,jy,1,n),td2(ix,jy,1,n), &
tth(ix,jy,llev,n),ustar(ix,jy,1,n),sshf(ix,jy,1,n),akz(llev))
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
! NCEP version hmix has been read in in readwind.f, is therefore not calculated here
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),hmixdummy,wstar(ix,jy,1,n),hmixplus)
if(lsubgrid.eq.1) then
subsceff=min(excessoro(ix,jy),hmixplus)
else
subsceff=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 NCEP 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=llev,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=llev,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
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