Title: The refinement of a meteorological pre-processor for the urban environment
Authors: Ari Karppinen, Sylvain M. Joffre, Jaakko Kukkonen
Addresses: Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN - 00810, Helsinki, Finland. Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN - 00810, Helsinki, Finland. Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN - 00810, Helsinki, Finland
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.
Keywords: dispersion; meteorological pre-processor; urban environment.
International Journal of Environment and Pollution, 2000 Vol.14 No.1/2/3/4/5/6, pp.565-572
Published online: 18 Jul 2003 *
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