10.4.1_peseiGFS_025bugfixes+enhancementsdevrelease-10release-10.4.1scaling-bug
Last change
on this file since 17c3c47 was
92fab65,
checked in by Ignacio Pisso <ip@…>, 4 years ago
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add SPDX-License-Identifier to all .f90 files
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-
Property mode set to
100644
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File size:
2.6 KB
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1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
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2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
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3 | |
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4 | function psih (z,l) |
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5 | |
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6 | !***************************************************************************** |
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7 | ! * |
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8 | ! Calculation of the stability correction term * |
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9 | ! * |
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10 | ! AUTHOR: Matthias Langer, adapted by Andreas Stohl (6 August 1993) * |
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11 | ! Update: G. Wotawa, 11 October 1994 * |
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12 | ! * |
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13 | ! Literature: * |
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14 | ! [1] C.A.Paulson (1970), A Mathematical Representation of Wind Speed * |
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15 | ! and Temperature Profiles in the Unstable Atmospheric Surface * |
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16 | ! Layer. J.Appl.Met.,Vol.9.(1970), pp.857-861. * |
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17 | ! * |
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18 | ! [2] A.C.M. Beljaars, A.A.M. Holtslag (1991), Flux Parameterization over* |
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19 | ! Land Surfaces for Atmospheric Models. J.Appl.Met. Vol. 30,pp 327-* |
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20 | ! 341 * |
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21 | ! * |
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22 | ! Variables: * |
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23 | ! L = Monin-Obukhov-length [m] * |
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24 | ! z = height [m] * |
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25 | ! zeta = auxiliary variable * |
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26 | ! * |
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27 | ! Constants: * |
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28 | ! eps = 1.2E-38, SUN-underflow: to avoid division by zero errors * |
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29 | ! * |
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30 | !***************************************************************************** |
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31 | |
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32 | use par_mod |
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33 | |
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34 | implicit none |
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35 | |
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36 | real :: psih,x,z,zeta,l |
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37 | real,parameter :: a=1.,b=0.667,c=5.,d=0.35,eps=1.e-20 |
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38 | |
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39 | if ((l.ge.0).and.(l.lt.eps)) then |
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40 | l=eps |
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41 | else if ((l.lt.0).and.(l.gt.(-1.*eps))) then |
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42 | l=-1.*eps |
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43 | endif |
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44 | |
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45 | if ((log10(z)-log10(abs(l))).lt.log10(eps)) then |
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46 | psih=0. |
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47 | else |
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48 | zeta=z/l |
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49 | if (zeta.gt.0.) then |
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50 | psih = - (1.+0.667*a*zeta)**(1.5) - b*(zeta-c/d)*exp(-d*zeta) & |
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51 | - b*c/d + 1. |
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52 | else |
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53 | x=(1.-16.*zeta)**(.25) |
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54 | psih=2.*log((1.+x*x)/2.) |
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55 | end if |
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56 | end if |
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57 | |
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58 | end function psih |
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