Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 3 2008 10.5194/acp-8-523-2008 http://www.atmos-chem-phys.net/8/523/2008/ http://www.atmos-chem-phys.net/8/523/2008/acp-8-523-2008.html http://www.atmos-chem-phys.net/8/523/2008/acp-8-523-2008.pdf 523 543 2008-02-06 Towards improving the simulation of meteorological fields in urban areas through updated/advanced surface fluxes description A. Baklanov alb@dmi.dk P. G. Mestayer A. Clappier S. Zilitinkevich S. Joffre A. Mahura N. W. Nielsen Meteorological Research Department, Danish Meteorological Institute, DMI, Copenhagen, Denmark Laboratoire de Mécanique des Fluides, UMR CNRS 6598, Ecole Centrale de Nantes, ECN, France La section Sciences et Ingénierie de l'Environnement (SSIE), Ecole Polytechnique Fédérale de Lausanne, EPFL, Switzerland Division of Atmospheric Sciences, University of Helsinki, Finland Research & Development, Finnish Meteorological Institute, FMI, Helsinki, Finland The increased resolution of numerical weather prediction models allows nowadays addressing more realistically urban meteorology and air pollution processes. This has triggered new interest in modelling and describing experimentally the specific features and processes of urban areas. Recent developments and results performed within the EU-funded project FUMAPEX on integrated systems for forecasting urban meteorology and air pollution are reported here. Sensitivity studies with respect to optimum resolution, parametrisation of urban roughness and surface exchange fluxes and the role of urban soil layers are carried out with advanced meso- or sub-meso meteorological models. They show that sensible improvements can be achieved by higher model resolution that is accompanied with better description of urban surface features. Recommendations, especially with respect to advanced urban air quality forecasting and information systems, are given together with an assessment of the needed further research and data. Arnfield, A. J. and Grimmond, C. S. B.: An urban canyon energy budget model and its application to urban storage heat flux modelling, Energy and Buildings, 27, 61–68, 1998. Arya S. P. S.: Buoyancy effects in a horizontal flat-plate boundary layer, J. Fluid Mech., 68, 321–343, 1975. Baklanov, A., Hänninen, O., Slørdal, L. H., Kukkonen, J., Sørensen, J. H., Bjergene, N., Fay, B., Finardi, S., Hoe, S. 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