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Regional climate-air quality decadal simulations over Europe were carriedout with the RegCM3/CAMx modeling system for the time slice 1991–2000, inorder to study the impact of different meteorological forcing on surfaceozone. The RegCM3 regional climate model was firstly constrained by theERA40 reanalysis dataset which is considered as an experiment with perfectmeteorological boundary conditions and then it was constrained by the globalcirculation model ECHAM5. A number of meteorological parameters wereexamined including the 500 mb geopotential height, solar radiation,temperature, cloud liquid water path, planetary boundary layer height andsurface wind. The different RegCM meteorological forcing resulted in changesof near surface ozone over Europe ranging between ± 4 ppb for winter andsummer. The area showing the greatest sensitivity in O<sub>3</sub> during winteris central and southern Europe while in summer central north continentalEurope. The different meteorological forcing impacts on the atmosphericcirculation, which in turn affects cloudiness and solar radiation,temperature, wind patterns and the meteorology depended biogenic emissions.For comparison reasons, the impact of chemical boundary conditions onsurface ozone was additionally examined with a series of sensitivitystudies, indicating that surface ozone changes are comparable to thosecaused by the different meteorological forcing. These findings suggest that,when it comes to regional climate-air quality simulations, the selection ofexternal meteorological forcing can be as important as the selection ofadequate chemical lateral boundary conditions

Decadal regional air quality simulations over Europe in present climate: near surface ozone sensitivity to external meteorological forcing