The refinement of a meteorological pre-processor for the urban environment
by Ari Karppinen, Sylvain M. Joffre, Jaakko Kukkonen
International Journal of Environment and Pollution (IJEP), Vol. 14, No. 1/2/3/4/5/6, 2000

Abstract: The meteorological pre-processor used routinely at the Finnish Meteorological Institute (FMI) has been modified in order better to represent urban conditions. We have re-evaluated the roughness length, introduced the zero displacement height and divided the surface layer into a roughness sub-layer and an inertial sub-layer. The friction velocity and Monin-Obukhov length are evaluated using an empirically developed, exponential, Reynolds stress profile in the roughness sub-layer. The effect of these modifications has been studied by computing the dispersion parameters used in the urban dispersion modelling system UDM-FMI and comparing the revised parameters with the previous model computations.

Online publication date: Fri, 18-Jul-2003

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