[16] | 1 | !*********************************************************************** |
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| 2 | !* Copyright 2012,2013 * |
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| 3 | !* Jerome Brioude, Delia Arnold, Andreas Stohl, Wayne Angevine, * |
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| 4 | !* John Burkhart, Massimo Cassiani, Adam Dingwell, Richard C Easter, Sabine Eckhardt,* |
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| 5 | !* Stephanie Evan, Jerome D Fast, Don Morton, Ignacio Pisso, * |
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| 6 | !* Petra Seibert, Gerard Wotawa, Caroline Forster, Harald Sodemann, * |
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| 7 | !* * |
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| 8 | !* This file is part of FLEXPART WRF * |
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| 9 | !* * |
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| 10 | !* FLEXPART is free software: you can redistribute it and/or modify * |
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| 11 | !* it under the terms of the GNU General Public License as published by* |
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| 12 | !* the Free Software Foundation, either version 3 of the License, or * |
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| 13 | !* (at your option) any later version. * |
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| 14 | !* * |
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| 15 | !* FLEXPART is distributed in the hope that it will be useful, * |
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| 16 | !* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 17 | !* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 18 | !* GNU General Public License for more details. * |
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| 19 | !* * |
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| 20 | !* You should have received a copy of the GNU General Public License * |
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| 21 | !* along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 22 | !*********************************************************************** |
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| 23 | ! real function obukhov(ps,tsurf,tdsurf,tlev,ustar,hf,akm,bkm) |
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| 24 | real function obukhov(ps,tsurf,tdsurf,tlev,ustar,hf,plev) |
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| 25 | !******************************************************************** |
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| 26 | ! * |
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| 27 | ! Author: G. WOTAWA * |
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| 28 | ! Date: 1994-06-27 * |
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| 29 | ! * |
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| 30 | ! Update: A. Stohl, 2000-09-25, avoid division by zero by * |
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| 31 | ! setting ustar to minimum value * |
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| 32 | ! * |
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| 33 | ! 20 Oct 2005 - R. Easter - pass plev as argument instead of * |
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| 34 | ! akm,bkm * |
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| 35 | ! * |
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| 36 | !******************************************************************** |
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| 37 | ! * |
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| 38 | ! This program calculates Obukhov scale height from surface * |
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| 39 | ! meteorological data and sensible heat flux. * |
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| 40 | ! * |
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| 41 | !******************************************************************** |
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| 42 | ! * |
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| 43 | ! INPUT: * |
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| 44 | ! * |
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| 45 | ! ps surface pressure [Pa] * |
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| 46 | ! tsurf surface temperature [K] * |
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| 47 | ! tdsurf surface dew point [K] * |
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| 48 | ! tlev temperature first model level [K] * |
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| 49 | ! ustar scale velocity [m/s] * |
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| 50 | ! hf surface sensible heat flux [W/m2] * |
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| 51 | ! akm ECMWF vertical discretization parameter * |
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| 52 | ! bkm ECMWF vertical discretization parameter * |
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| 53 | ! * |
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| 54 | !******************************************************************** |
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| 55 | |
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| 56 | ! include 'includepar' |
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| 57 | ! real akm(nwzmax),bkm(nwzmax) |
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| 58 | ! real ps,tsurf,tdsurf,tlev,ustar,hf,e,ew,tv,rhoa,plev |
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| 59 | ! real ak1,bk1,theta,thetastar |
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| 60 | use par_mod |
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| 61 | |
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| 62 | implicit none |
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| 63 | |
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| 64 | real :: ps,tsurf,tdsurf,tlev,ustar,hf,e,ew,tv,rhoa,plev |
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| 65 | real :: theta,thetastar |
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| 66 | |
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| 67 | |
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| 68 | e=ew(tdsurf) ! vapor pressure |
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| 69 | tv=tsurf*(1.+0.378*e/ps) ! virtual temperature |
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| 70 | rhoa=ps/(r_air*tv) ! air density |
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| 71 | ! ak1=(akm(1)+akm(2))/2. |
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| 72 | ! bk1=(bkm(1)+bkm(2))/2. |
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| 73 | ! plev=ak1+bk1*ps ! Pressure level 1 |
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| 74 | theta=tlev*(100000./plev)**(r_air/cpa) ! potential temperature |
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| 75 | if (ustar.le.0.) ustar=1.e-8 |
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| 76 | thetastar=hf/(rhoa*cpa*ustar) ! scale temperature |
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| 77 | if(abs(thetastar).gt.1.e-10) then |
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| 78 | obukhov=theta*ustar**2/(karman*ga*thetastar) |
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| 79 | else |
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| 80 | obukhov=9999 ! zero heat flux |
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| 81 | endif |
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| 82 | if (obukhov.gt. 9999.) obukhov= 9999. |
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| 83 | if (obukhov.lt.-9999.) obukhov=-9999. |
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| 84 | |
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| 85 | end function obukhov |
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| 86 | |
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