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 raerod (l,ust,z0) |
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5 | |
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6 | !***************************************************************************** |
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7 | ! * |
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8 | ! Calculation of the aerodynamical resistance ra from ground up to href * |
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9 | ! * |
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10 | ! AUTHOR: Matthias Langer, modified by Andreas Stohl (6 August 1993) * |
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11 | ! * |
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12 | ! Literature: * |
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13 | ! [1] Hicks/Baldocchi/Meyers/Hosker/Matt (1987), A Preliminary * |
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14 | ! Multiple Resistance Routine for Deriving Dry Deposition * |
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15 | ! Velocities from Measured Quantities. * |
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16 | ! Water, Air and Soil Pollution 36 (1987), pp.311-330. * |
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17 | ! [2] Scire/Yamartino/Carmichael/Chang (1989), * |
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18 | ! CALGRID: A Mesoscale Photochemical Grid Model. * |
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19 | ! Vol II: User's Guide. (Report No.A049-1, June, 1989) * |
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20 | ! * |
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21 | ! Variable list: * |
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22 | ! L = Monin-Obukhov-length [m] * |
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23 | ! ust = friction velocity [m/sec] * |
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24 | ! z0 = surface roughness length [m] * |
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25 | ! href = reference height [m], for which deposition velocity is * |
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26 | ! calculated * |
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27 | ! * |
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28 | ! Constants: * |
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29 | ! karman = von Karman-constant (~0.4) * |
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30 | ! ramin = minimum resistence of ra (1 s/m) * |
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31 | ! * |
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32 | ! Subprograms and functions: * |
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33 | ! function psih (z/L) * |
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34 | ! * |
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35 | !***************************************************************************** |
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36 | |
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37 | use par_mod |
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38 | |
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39 | implicit none |
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40 | |
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41 | real :: l,psih,raerod,ust,z0 |
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42 | |
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43 | raerod=(alog(href/z0)-psih(href,l)+psih(z0,l))/(karman*ust) |
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44 | |
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45 | end function raerod |
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