Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 4 2007 10.5194/acpd-7-12289-2007 http://www.atmos-chem-phys-discuss.net/7/12289/2007/ http://www.atmos-chem-phys-discuss.net/7/12289/2007/acpd-7-12289-2007.html http://www.atmos-chem-phys-discuss.net/7/12289/2007/acpd-7-12289-2007.pdf 12289 12326 2007-08-20 Modelling the impact of sub-grid scale emission variability on upper-air concentration S. Galmarini stefano.galmarini@jrc.it J.-F. Vinuesa A. Martilli European Commission – DG Joint Research Centre, Institute for Environment and Sustainability, 21020 Ispra, Italy CIEMAT, Madrid, Spain The long standing issue of sub-grid emission heterogeneity and its influence to upper air concentration is addressed here and a subgrid model proposed. The founding concept of the approach is the assumption that average emission acts as source terms of average concentration, while emission fluctuations are source for the concentration variance. 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