Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 4 2009 10.5194/amtd-2-1863-2009 http://www.atmos-meas-tech-discuss.net/2/1863/2009/ http://www.atmos-meas-tech-discuss.net/2/1863/2009/amtd-2-1863-2009.html http://www.atmos-meas-tech-discuss.net/2/1863/2009/amtd-2-1863-2009.pdf 1863 1899 2009-08-04 Seasonal distribution of aerosol properties over Europe and their impact on UV irradiance N. Y. Chubarova chubarova@imp.kiae.ru Faculty of Geography, Moscow State University, Moscow, Russia Using the aerosol optical thickness at 550 nm (τ₅₅₀) from MODIS (collection 5) combined with the aerosol products from the ground-based AERONET network, key aerosol parameters have been obtained with 1 degree resolution over Europe. Additional tests have revealed a satisfactory quality of the MODIS data, except in a few cases. Quality assured AERONET data are used for evaluating the Angstrom exponent, single scattering albedo and asymmetry factor, and for validating the final aerosol optical thickness in the UV spectral region. A method for extrapolating the aerosol parameters into the UV spectral region is discussed. The aerosol optical thickness distributions are considered together with meteorological fields from NOAA_NCEP_CPC_CAMS_OPI climatology. The τ₃₄₀ is shown to vary significantly from approximately 0.01 to 0.9 depending on the season and location. Permanent elevated aerosol loading over several industrial areas is observed, which agrees with the output of chemical transport models. Using radiative transfer modeling, monthly mean UV loss due to aerosol was estimated. The absolute decrease in UV indices varies from less than 0.1 to 1.5. 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