Aerosol optical properties at Lampedusa Central Mediterranean 2. Determination of single scattering albedo at two wavelengths for different aerosol typesReport as inadecuate




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1 ENEA - Italian National agency for new technologies, Energy and sustainable economic development Frascati

Abstract : Aerosol optical properties were retrieved from direct and diffuse spectral irradiance measurements made by a multi-filter rotating shadowband radiometer MFRSR at the island of Lampedusa 35.5° N, 12.6° E, in the Central Mediterranean, in the period July 2001?September 2003. In a companion paper Pace et al., 2005 the aerosol optical depth AOD and Ångström exponent were used together with airmass backward trajectories to identify and classify different aerosol types. The MFRSR diffuse-to-direct ratio DDR at 415.6 nm and 868.7 nm for aerosol classified as biomass burning-urban-industrial, originating primarily from 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 initialized with the measured aerosol optical depth; calculations are performed at the two wavelengths varying the SSA values until the modelled DDR matches the MFRSR observations. Sensitivity studies are performed to estimate how uncertainties on AOD, DDR, asymmetry factor g, and surface albedo influence the retrieved SSA values. The results show that a 3% variation of AOD or DDR produce a change of about 0.02 in the retrieved SSA value at 415.6 and 868.7 nm; a ±0.06 variation of the asymmetry factor g produces a change of the estimated SSA of



Author: D. Meloni - A. Di Sarra - G. Pace - F. Monteleone -

Source: https://hal.archives-ouvertes.fr/



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