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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 ew(x)
!****************************************************************
!SAETTIGUNGSDAMPFDRUCK UEBER WASSER IN PA. X IN KELVIN.
!NACH DER GOFF-GRATCH-FORMEL.
!****************************************************************
implicit none
real :: x, y, a, c, d
ew=0.
if(x.le.0.) stop 'sorry: t not in [k]'
y=373.16/x
a=-7.90298*(y-1.)
a=a+(5.02808*0.43429*alog(y))
c=(1.-(1./y))*11.344
c=-1.+(10.**c)
c=-1.3816*c/(10.**7)
d=(1.-y)*3.49149
d=-1.+(10.**d)
d=8.1328*d/(10.**3)
y=a+c+d
ew=101324.6*(10.**y) ! Saettigungsdampfdruck in Pa
end function ew
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