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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 getvdep(n,ix,jy,ust,temp,pa,L,gr,rh,rr,snow,vdepo)
! i i i i i i i i i i i o
!*****************************************************************************
! *
! This routine calculates the dry deposition velocities. *
! *
! Author: A. Stohl *
! *
! 20 December 1996 *
! Sabine Eckhardt, Jan 07 *
! if the latitude is negative: add half a year to the julian day *
! *
!*****************************************************************************
! *
! Variables: *
! gr [W/m2] global radiation *
! L [m] Obukhov length *
! nyl kinematic viscosity *
! pa [Pa] surface air pressure *
! ra [s/m] aerodynamic resistance *
! raquer [s/m] average aerodynamic resistance *
! rh [0-1] relative humidity *
! rhoa density of the air *
! rr [mm/h] precipitation rate *
! temp [K] 2m temperature *
! tc [C] 2m temperature *
! ust [m/s] friction velocity *
! snow [m of water equivalent] snow depth *
! xlanduse fractions of numclasS landuses for each model grid point *
! *
!*****************************************************************************
use par_mod
use com_mod
implicit none
integer :: yyyymmdd,hhmmss,yyyy,mmdd,n,lseason,i,j,ix,jy
real :: vdepo(maxspec),vd,rb(maxspec),rc(maxspec),raquer,ylat
real :: raerod,ra,ust,temp,tc,pa,L,gr,rh,rr,myl,nyl,rhoa,diffh2o,snow
real :: slanduse(numclass)
real,parameter :: eps=1.e-5
real(kind=dp) :: jul
! Calculate month and determine the seasonal category
!****************************************************
jul=bdate+real(wftime(n),kind=dp)/86400._dp
ylat=jy*dy+ylat0
if (ylat.lt.0) then
jul=jul+365/2
endif
call caldate(jul,yyyymmdd,hhmmss)
yyyy=yyyymmdd/10000
mmdd=yyyymmdd-10000*yyyy
if ((ylat.gt.-20).and.(ylat.lt.20)) then
mmdd=600 ! summer
endif
if ((mmdd.ge.1201).or.(mmdd.le.301)) then
lseason=4
else if ((mmdd.ge.1101).or.(mmdd.le.331)) then
lseason=3
else if ((mmdd.ge.401).and.(mmdd.le.515)) then
lseason=5
else if ((mmdd.ge.516).and.(mmdd.le.915)) then
lseason=1
else
lseason=2
endif
! Calculate diffusivity of water vapor
!************************************
diffh2o=2.11e-5*(temp/273.15)**1.94*(101325/pa)
! Conversion of temperature from K to C
!**************************************
tc=temp-273.15
! Calculate dynamic viscosity
!****************************
if (tc.lt.0) then
myl=(1.718+0.0049*tc-1.2e-05*tc**2)*1.e-05
else
myl=(1.718+0.0049*tc)*1.e-05
endif
! Calculate kinematic viscosity
!******************************
rhoa=pa/(287.*temp)
nyl=myl/rhoa
! 0. Set all deposition velocities zero
!**************************************
do i=1,nspec
vdepo(i)=0.
end do
! 1. Compute surface layer resistances rb
!****************************************
call getrb(nspec,ust,nyl,diffh2o,reldiff,rb)
! change for snow
do j=1,numclass
if (snow.gt.0.001) then ! 10 mm
if (j.eq.12) then
slanduse(j)=1.
else
slanduse(j)=0.
endif
else
slanduse(j)=xlanduse(ix,jy,j)
endif
end do
raquer=0.
do j=1,numclass ! loop over all landuse classes
if (slanduse(j).gt.eps) then
! 2. Calculate aerodynamic resistance ra
!***************************************
ra=raerod(L,ust,z0(j))
raquer=raquer+ra*slanduse(j)
! 3. Calculate surface resistance for gases
!******************************************
call getrc(nspec,lseason,j,tc,gr,rh,rr,rc)
! 4. Calculate deposition velocities for gases and ...
! 5. ... sum deposition velocities for all landuse classes
!*********************************************************
do i=1,nspec
if (reldiff(i).gt.0.) then
if ((ra+rb(i)+rc(i)).gt.0.) then
vd=1./(ra+rb(i)+rc(i))
! XXXXXXXXXXXXXXXXXXXXXXXXXX TEST
! vd=1./rc(i)
! XXXXXXXXXXXXXXXXXXXXXXXXXX TEST
else
vd=9.999
endif
vdepo(i)=vdepo(i)+vd*slanduse(j)
endif
end do
endif
end do
! 6. Calculate deposition velocities for particles
!*************************************************
call partdep(nspec,density,fract,schmi,vset,raquer,ust,nyl,vdepo)
! 7. If no detailed parameterization available, take constant deposition
! velocity if that is available
!***********************************************************************
do i=1,nspec
if ((reldiff(i).lt.0.).and.(density(i).lt.0.).and. &
(dryvel(i).gt.0.)) then
vdepo(i)=dryvel(i)
endif
end do
end subroutine getvdep
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