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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 getrc(nc,i,j,t,gr,rh,rr,rc)
! i i i i i i i o
!*****************************************************************************
! *
! Calculation of the surface resistance according to the procedure given *
! in: *
! Wesely (1989): Parameterization of surface resistances to gaseous *
! dry deposition in regional-scale numerical models. *
! Atmos. Environ. 23, 1293-1304. *
! *
! *
! AUTHOR: Andreas Stohl, 19 May 1995 *
! *
!*****************************************************************************
! *
! Variables: *
! *
! reldiff(maxspec) diffusivity of H2O/diffusivity of component i *
! gr [W/m2] global radiation *
! i index of seasonal category *
! j index of landuse class *
! ldep(maxspec) 1, if deposition shall be calculated for species i *
! nc actual number of chemical components *
! rcl(maxspec,5,8) [s/m] Lower canopy resistance *
! rgs(maxspec,5,8) [s/m] Ground resistance *
! rlu(maxspec,5,8) [s/m] Leaf cuticular resistance *
! rm(maxspec) [s/m] Mesophyll resistance *
! t [C] temperature *
! *
!*****************************************************************************
use par_mod
use com_mod
implicit none
integer :: i,j,ic,nc
real :: gr,rh,rr,t,rs,rsm,corr,rluc,rclc,rgsc,rdc,rluo
real :: rc(maxspec)
! Compute stomatal resistance
!****************************
! Sabine Eckhardt, Dec 06: use 1E25 instead of 99999. for infinite res.
if ((t.gt.0.).and.(t.lt.40.)) then
rs=ri(i,j)*(1.+(200./(gr+0.1))**2)*(400./(t*(40.-t)))
else
rs=1.E25
! rs=99999.
endif
! Correct stomatal resistance for effect of dew and rain
!*******************************************************
if ((rh.gt.0.9).or.(rr.gt.0.)) rs=rs*3.
! Compute the lower canopy resistance
!************************************
rdc=100.*(1.+1000./(gr+10.))
corr=1000.*exp(-1.*t-4.)
do ic=1,nc
if (reldiff(ic).gt.0.) then
! Compute combined stomatal and mesophyll resistance
!***************************************************
rsm=rs*reldiff(ic)+rm(ic)
! Correct leaf cuticular, lower canopy and ground resistance
!***********************************************************
rluc=rlu(ic,i,j)+corr
rclc=rcl(ic,i,j)+corr
rgsc=rgs(ic,i,j)+corr
! Correct leaf cuticular resistance for effect of dew and rain
!*************************************************************
if (rr.gt.0.) then
rluo=1./(1./1000.+1./(3.*rluc))
rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo)
else if (rh.gt.0.9) then
rluo=1./(1./3000.+1./(3.*rluc))
rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo)
endif
! Combine resistances to give total resistance
!*********************************************
rc(ic)=1./(1./rsm+1./rluc+1./(rdc+rclc)+1./(rac(i,j)+rgsc))
! Sabine Eckhardt, Dec 06: avoid possible excessively high vdep
if (rc(ic).lt.10.) rc(ic)=10.
endif
end do
end subroutine getrc
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