[e200b7a] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | real function scalev(ps,t,td,stress) |
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| 23 | |
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| 24 | !******************************************************************** |
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| 25 | ! * |
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| 26 | ! Author: G. WOTAWA * |
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| 27 | ! Date: 1994-06-27 * |
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| 28 | ! Update: 1996-05-21 A. Stohl * |
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| 29 | ! * |
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| 30 | !******************************************************************** |
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| 31 | ! * |
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| 32 | ! This Programm calculates scale velocity ustar from surface * |
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| 33 | ! stress and air density. * |
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| 34 | ! * |
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| 35 | !******************************************************************** |
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| 36 | ! * |
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| 37 | ! INPUT: * |
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| 38 | ! * |
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| 39 | ! ps surface pressure [Pa] * |
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| 40 | ! t surface temperature [K] * |
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| 41 | ! td surface dew point [K] * |
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| 42 | ! stress surface stress [N/m2] * |
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| 43 | ! * |
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| 44 | !******************************************************************** |
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| 45 | |
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| 46 | use par_mod |
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| 47 | |
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| 48 | implicit none |
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| 49 | |
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| 50 | real :: ps,t,td,e,ew,tv,rhoa,stress |
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| 51 | |
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| 52 | e=ew(td) ! vapor pressure |
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| 53 | tv=t*(1.+0.378*e/ps) ! virtual temperature |
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| 54 | rhoa=ps/(r_air*tv) ! air density |
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| 55 | scalev=sqrt(abs(stress)/rhoa) |
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| 56 | |
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| 57 | end function scalev |
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