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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/>. *
!**********************************************************************
real function scalev(ps,t,td,stress)
!********************************************************************
! *
! Author: G. WOTAWA *
! Date: 1994-06-27 *
! Update: 1996-05-21 A. Stohl *
! *
!********************************************************************
! *
! This Programm calculates scale velocity ustar from surface *
! stress and air density. *
! *
!********************************************************************
! *
! INPUT: *
! *
! ps surface pressure [Pa] *
! t surface temperature [K] *
! td surface dew point [K] *
! stress surface stress [N/m2] *
! *
!********************************************************************
use par_mod
implicit none
real :: ps,t,td,e,ew,tv,rhoa,stress
e=ew(td) ! vapor pressure
tv=t*(1.+0.378*e/ps) ! virtual temperature
rhoa=ps/(r_air*tv) ! air density
scalev=sqrt(abs(stress)/rhoa)
end function scalev
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