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. An experimental setup to study aerosol hygroscopicity is proposed based onthe temporal evolution of attenuated backscatter coefficients from aceilometer colocated with an instrumented tower equipped with meteorologicalsensors at different heights. This setup is used to analyze a 4.5-yeardatabase at the ACTRIS SIRTA observatory in Palaiseau (Paris, France, 2.208 ∘  E, 48.713 ∘  N; 160 m above sea level). Astrict criterion-based procedure has been established to identifyhygroscopic growth cases using ancillary information, such as onlinechemical composition, resulting in 8 hygroscopic growth cases from atotal of 107 potential cases. For these eight cases, hygroscopicgrowth-related properties, such as the attenuated backscatter enhancementfactor fβ (RH) and the hygroscopic growthcoefficient γ , are evaluated. This study shows that thehygroscopicity parameter γ is negatively correlated with the aerosolorganic mass fraction but shows a positive correlation with the aerosolinorganic mass fraction. Among inorganic species, nitrate exhibited the highest correlation. This is the first time that hygroscopic enhancement factors are directlyretrieved under ambient aerosols using remote-sensing techniques, which arecombined with online chemical composition in situ measurements to evaluatethe role of the different aerosol species in aerosol hygroscopicity.

Long-term aerosol optical hygroscopicity study at the ACTRIS SIRTA observatory: synergy between ceilometer and in situ measurements