[e200b7a] | 1 | function raerod (l,ust,z0) |
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| 2 | |
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| 3 | !***************************************************************************** |
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| 4 | ! * |
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| 5 | ! Calculation of the aerodynamical resistance ra from ground up to href * |
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| 6 | ! * |
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| 7 | ! AUTHOR: Matthias Langer, modified by Andreas Stohl (6 August 1993) * |
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| 8 | ! * |
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| 9 | ! Literature: * |
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| 10 | ! [1] Hicks/Baldocchi/Meyers/Hosker/Matt (1987), A Preliminary * |
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| 11 | ! Multiple Resistance Routine for Deriving Dry Deposition * |
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| 12 | ! Velocities from Measured Quantities. * |
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| 13 | ! Water, Air and Soil Pollution 36 (1987), pp.311-330. * |
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| 14 | ! [2] Scire/Yamartino/Carmichael/Chang (1989), * |
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| 15 | ! CALGRID: A Mesoscale Photochemical Grid Model. * |
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| 16 | ! Vol II: User's Guide. (Report No.A049-1, June, 1989) * |
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| 17 | ! * |
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| 18 | ! Variable list: * |
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| 19 | ! L = Monin-Obukhov-length [m] * |
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| 20 | ! ust = friction velocity [m/sec] * |
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| 21 | ! z0 = surface roughness length [m] * |
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| 22 | ! href = reference height [m], for which deposition velocity is * |
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| 23 | ! calculated * |
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| 24 | ! * |
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| 25 | ! Constants: * |
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| 26 | ! karman = von Karman-constant (~0.4) * |
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| 27 | ! ramin = minimum resistence of ra (1 s/m) * |
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| 28 | ! * |
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| 29 | ! Subprograms and functions: * |
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| 30 | ! function psih (z/L) * |
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| 31 | ! * |
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| 32 | !***************************************************************************** |
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| 33 | |
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| 34 | use par_mod |
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| 35 | |
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| 36 | implicit none |
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| 37 | |
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| 38 | real :: l,psih,raerod,ust,z0 |
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| 39 | |
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| 40 | raerod=(alog(href/z0)-psih(href,l)+psih(z0,l))/(karman*ust) |
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| 41 | |
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| 42 | end function raerod |
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