Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 2 2010 10.5194/acp-10-789-2010 http://www.atmos-chem-phys.net/10/789/2010/ http://www.atmos-chem-phys.net/10/789/2010/acp-10-789-2010.html http://www.atmos-chem-phys.net/10/789/2010/acp-10-789-2010.pdf 789 815 2010-01-26 Global model simulations of air pollution during the 2003 European heat wave C. Ordóñez carlos.ordonez@metoffice.gov.uk 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 and Atmospheric Environment, Faculty of Geology and Geoenvironment, University of Athens, Greece Atmospheric Environment Division, Biomedical Research Foundation of the Academy of 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 Western/Central Europe for summer 2003. The models reproduce the meteorological features and enhancement of pollution 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% for 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%. The high reactivity and small dry deposition velocities in MOCAGE seem to be responsible for the overestimation of O₃ in this model. Results from sensitivity simulations indicate that an increase of the horizontal resolution 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 models. 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