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Aerosol light scattering, absorption and particulate matter (PM)concentrations were measured at Montseny, a regional background site in theWestern Mediterranean Basin (WMB) which is part of the European Supersitefor Atmospheric Aerosol Research (EUSAAR). Off line analyses of 24 h PMfilters collected with Hi-Vol instruments were performed for thedetermination of the main chemical components of PM. Mean scattering andhemispheric backscattering coefficients (@ 635 nm) were 26.6±23.2 Mm−1and 4.3±2.7 Mm−1, respectively and the mean aerosolabsorption coefficient (@ 637 nm) was 2.8±2.2 Mm−1. Mean values ofSingle Scattering Albedo (SSA) and Ångström exponent (å)(calculated from 450 nm to 635 nm) at MSY were 0.90±0.05 and 1.3±0.5respectively. A clear relationship was observed between thePM1/PM10 and PM2.5/PM10 ratios as a function of thecalculated Ångström exponents. Mass scattering cross sections (MSC)for fine mass and sulfate at 635 nm were 2.8±0.5 m2 g−1 and11.8±2.2 m2 g−1, respectively, while the mean aerosol absorption crosssection (MAC) was 10.4±2.0 m2 g−1. The variability in aerosoloptical properties in the WMB were largely explained by the origin andageing of air masses over the measurement site. The MAC values appeardependent of particles aging: similar to the expected absorptioncross-section for fresh emissions under Atlantic Advection episodes andhigher under aerosol pollution episodes. The analysis of theÅngström exponent as a function of the origin the air massesrevealed that polluted winter anticyclonic conditions and summerrecirculation scenarios typical of the WMB led to an increase of fineparticles in the atmosphere (å = 1.5±0.1) while the aerosol opticalproperties under Atlantic Advection episodes and Saharan dust outbreaks wereclearly dominated by coarser particles (å = 1.0±0.4). The seabreeze played an important role in transporting pollutants from thedeveloped WMB coastlines towards inland rural areas, changing the opticalproperties of aerosols. Aerosol scattering and backscattering coefficientsincreased by around 40 % in the afternoon when the sea breeze was fullydeveloped while the absorption coefficient increased by more than 100 % asa consequence of the increase in the equivalent black carbon concentration(EBC) observed at MSY under sea breeze circulation

Variability of aerosol optical properties in the Western Mediterranean Basin