!********************************************************************** ! 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 . * !********************************************************************** 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