Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-10675-2009 http://www.atmos-chem-phys-discuss.net/9/10675/2009/ http://www.atmos-chem-phys-discuss.net/9/10675/2009/acpd-9-10675-2009.html http://www.atmos-chem-phys-discuss.net/9/10675/2009/acpd-9-10675-2009.pdf 10675 10710 2009-05-04 Decadal regional air quality simulations over Europe in present climate: near surface ozone sensitivity to external meteorological forcing E. Katragkou katragou@auth.gr P. Zanis I. Tegoulias D. Melas B. C. Krüger P. Huszar T. Halenka S. Rauscher Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece Department of Meteorology and Climatology, Aristotle University of Thessaloniki, Greece Inst. of Meteorology, Univ. of Natural Resources and Applied Life Sciences, Vienna, Austria Dept. of Meteorology and Environment Protection, Charles University, Prague, Czech Republic Earth System Physics Section, The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy Regional air quality decadal simulations were carried out using the air quality model CAMx driven off-line by the regional climate model RegCM3 for the time slice 1991–2000 using two different datasets of external meteorological forcing to constrain RegCM3: the ERA40 global atmospheric reanalysis dataset and the output from the GCM ECHAM5. The focus of this work is to compare the perfect lateral boundary conditions experiment with the GCM driven control experiment and to investigate how this external meteorological forcing affects near surface ozone. The different RegCM3 meteorological forcings resulted in changes of near surface ozone over Europe ranging between ±5 ppb for winter and summer, while all model parameterizations and anthropogenic emissions remained unchanged. Changes in near surface ozone are induced by changes in meteorological fields and biogenic emissions, which are on-line calculated and meteorology-dependent. The model simulations suggest that the change in solar radiation is the factor that mostly modulates the ozone changes in summer. During winter season it is found that the induced changes in NO_x explain about 40% of the ozone variability. 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