Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-16853-2009 http://www.atmos-chem-phys-discuss.net/9/16853/2009/ http://www.atmos-chem-phys-discuss.net/9/16853/2009/acpd-9-16853-2009.html http://www.atmos-chem-phys-discuss.net/9/16853/2009/acpd-9-16853-2009.pdf 16853 16911 2009-08-07 Global model simulations of air pollution during the 2003 European heat wave C. Ordóñez N. Elguindi O. Stein V. Huijnen J. Flemming A. Inness H. Flentje E. Katragkou P. Moinat V.-H. Peuch A. Segers V. Thouret G. Athier M. van Weele C. S. Zerefos J.-P. Cammas M. G. Schultz Laboratoire d'Aérologie, UMR5560, CNRS and Université de Toulouse, Toulouse, France Met Office, Atmospheric Dispersion Group, Exeter, UK FZ Jülich, Institute for Chemistry and Dynamics of the Geosphere – 2: Troposphere, Jülich, Germany Max Planck Institute for Meteorology, Hamburg, Germany Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands European Centre for Medium-Range Weather Forecasts (ECMWF), Reading, UK Deutscher Wetterdienst (DWD), Observatorium Hohenpeißenberg, Germany Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece Météo-France, Centre National de Recherches Météorologiques, Toulouse, France TNO Built Environment and Geosciences, Department of Air Quality and Climate, Utrecht, The Netherlands Laboratory of Climatology, Faculty of Geology, University of Athens, Athens, Greece Three global Chemistry Transport Models – MOZART, MOCAGE, and TM5 – as well as MOZART coupled to the IFS meteorological model including assimilation of ozone (O₃) and carbon monoxide (CO) satellite column retrievals, have been compared to surface measurements and MOZAIC vertical profiles in the troposphere over Europe for summer 2003. The models reproduce the meteorological features and enhancement of pollution in the troposphere over Central and Western Europe during the period 2–14 August, but not fully the ozone and CO mixing ratios measured during that episode. Modified normalised mean biases are around −25% (except ~5% for MOCAGE) in the case of ozone and from −80% to −30% in the case of CO in the boundary layer above Frankfurt. The coupling and assimilation of CO columns from MOPITT overcomes some of the deficiencies in the treatment of transport, chemistry and emissions in MOZART, reducing the negative biases to around 20%. Results from sensitivity simulations indicate that an increase of the coarse resolution of the global models to around 1°×1° and potential uncertainties in European anthropogenic emissions or in long-range transport of pollution cannot completely account for the underestimation of CO and O₃ found for most global models. 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