Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-25565-2009 http://www.atmos-chem-phys-discuss.net/9/25565/2009/ http://www.atmos-chem-phys-discuss.net/9/25565/2009/acpd-9-25565-2009.html http://www.atmos-chem-phys-discuss.net/9/25565/2009/acpd-9-25565-2009.pdf 25565 25597 2009-11-27 Physical and optical properties of atmospheric aerosol by in-situ and radiometric measurements M. Calvello calvello@imaa.cnr.it F. Esposito G. Pavese C. Serio Consiglio Nazionale delle Ricerche-Istituto di Metodologie per l'Analisi Ambientale (CNR-IMAA), C.da S.Loja, 85050 Tito Scalo, Potenza, Italy Dipartimento di Ingegneria e Fisica dell'Ambiente, Universitá della Basilicata, Viale dell'Ateneo Lucano n.10, 85100 Potenza, Italy Physical and optical properties of atmospheric aerosols collected by using a high resolution (1.5 nm) spectroradiometer (spectral range 400–800 nm), a 13 stages Dekati Low Pressure Impactor (size range 30 nm–10 μm), and an AE31 Aethalometer (7 wavelenghts from 370 nm to 950 nm), have been examined in a semi-rural site in Southwest Italy (Tito Scalo, 40°35´ N, 15°41´ E, 750 m a.s.l.). In particular, daily averaged values of AOD and Ã…ngström turbidity parameters from radiometric data together with mass-size distributions from impactor data and Black Carbon (BC) concentrations have been analyzed from May to October 2008. Furthermore, by inverting direct solar radiances, aerosol columnar number and volume size distributions have been obtained for the same period. Comparison of different observation methods, allowed to verify if, and in what conditions, changes in aerosol properties measured at ground are representative of columnar properties variations. Agreement between columnar and in-situ measurements has been obtained in case of anthropogenic aerosol loading, while in case of Saharan dust intrusions some discrepancies have been found when dust particles were located at high layers in the atmosphere (4–8 km) thus affecting columnar properties more than surface ones. For anthropogenic aerosols, a good correlation has been confirmed through the comparison of fine aerosol fraction contribution as measured by radiometer, impactor and aethalometer, suggesting that in this case particles are more homogeneously distributed over the lower layers of atmosphere and columnar aerosol optical properties are dominated by surface measured component. Baron,~P A. and Willeke,~K.: Aerosol Measurements. Principles, Techniques, and Application, Wiley & Sons, Inc., New York, USA, 2001. Cachorro,~V E., Toledano,~C., Prats,~N., Sorribas,~M., Mogo,~S., Berjón,~A., Torres,~B., Rodrigo,~R., de la Rosa,~J., and De Frutos,~A M.: The strongest desert dust intrusion mixed with smoke over the Iberian Peninsula registered with Sun photometry, J. Geophys. Res., 113, D14S04, \doi10.1029/2007JD009582, 2008. 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