Towards urbanisation of the non-hydrostatic numerical weather prediction model Lokalmodell (LM) |
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Authors: | Lina Neunhäuserer Barbara Fay Matthias Raschendorfer |
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Affiliation: | (1) Dispersion Modelling, Deutscher Wetterdienst, Kaiserleistr. 42, 63067 Offenbach, Germany |
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Abstract: | Numerical weather prediction models are increasingly employed for providing meteorological data for urban air quality applications. Model resolution, physiographic parameters and surface-layer parameterisations need to be adapted to the requirements of the urban boundary layer. The Lokalmodell of the German Weather Service was triple-nested down to a horizontal grid resolution of 1.1 km, urbanised physiographic parameters were implemented, and an additional anthropogenic heat source was introduced. Results of a sensitivity study for a spring dust episode in Helsinki show a clear urbanisation effect of these measures on temperature, humidity and the partitioning of surface fluxes, leading to an increased Bowen ratio and heat storage and an urban heat island effect. |
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Keywords: | Anthropogenic heat source Urban air pollution episodes Urban scale NWP modelling Urban surface layer Urbanised physiographic parameters |
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