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Aerosol optical properties were retrieved from direct and diffuse spectralirradiance measurements made by a multi-filter rotating shadowbandradiometer (MFRSR) at the island of Lampedusa (35.5° N, 12.6° E), inthe Central Mediterranean, in the period July 2001–September 2003. In acompanion paper (Pace et al., 2006) the aerosol optical depth (AOD) and\uc5ngstr\uf6m exponent were used together with airmass backwardtrajectories to identify and classify different aerosol types. The MFRSRdiffuse-to-direct ratio (DDR) at 415.6 nm and 868.7 nm for aerosolclassified as "biomass burning-urban/industrial", originating primarilyfrom the European continent, and desert dust, originating from the Sahara,is used in this study to estimate the aerosol single scattering albedo(SSA). A detailed radiative transfer model is initialised with the measuredaerosol optical depth; calculations are performed at the two wavelengthsvarying the SSA values until the modelled DDR matches the MFRSRobservations. Sensitivity studies are performed to estimate howuncertainties on AOD, DDR, asymmetry factor (<I>g</I>), and surface albedo influencethe retrieved SSA values. The results show that a 3% variation of AOD orDDR produce a change of about 0.02 in the retrieved SSA value at 415.6 and868.7 nm; a ±0.06 variation of the asymmetry factor <I>g</I> produces a changeof the estimated SSA of <0.04 at 415.6 nm, and <0.06 at 868.7 nm;finally, an increase of the assumed surface albedo of 0.05 causes very smallchanges (0.01–0.02) in the retrieved SSA. The calculations show that the SSAof desert dust (DD) increases with wavelength, from 0.81±0.05 at 415.6 nmto 0.94±0.05 at 868.7 nm; on the contrary, the SSA ofurban/industrial (UN) aerosols decreases from 0.96±0.02 at 415.6 nm to0.87±0.07 at 868.7 nm; the SSA of biomass burning (BB) particles is0.82±0.04 at 415.6 nm and 0.80±0.05 at 868.7 nm. Episodes of UNaerosols occur usually in June and July; long lasting BB aerosol episodeswith large AOD are observed mainly in July and August, the driest months ofthe year, when the development of fires is frequent

atmospheric chemistry and physics

Aerosol optical properties at Lampedusa (Central Mediterranean). 2. Determination of single scattering albedo at two wavelengths for different aerosol types