Print Email Facebook Twitter Study of aerosol hygroscopic events over the Cabauw experimental site for atmospheric research (CESAR) using the multi-wavelength Raman lidar Caeli Title Study of aerosol hygroscopic events over the Cabauw experimental site for atmospheric research (CESAR) using the multi-wavelength Raman lidar Caeli Author Fernández, A.J. Apituley, A. Veselovskii, I. Suvorina, A. Henzing, J. Pujadas, M. Artíñano, B. Publication year 2015 Abstract This article presents a study of aerosol optical and microphysical properties under different relative humidity (RH) but well mixed layer conditions using optical and microphysical aerosol properties from multi-wavelength (MW) Raman lidar and in-situ aerosol observations collected at the Cabauw Experimental Site for Atmospheric Research (CESAR). Two hygroscopic events are described through 3 backscatter (β) and 2 extinction (α) coefficients which in turn provide intensive parameters such as the backscatter-related Ångström exponent (åβ) and the lidar ratio (LR). Along with it, profiles of RH were inferred from Raman lidar observations and therefore, as a result of varying humidity conditions, a shift on the aerosol optical properties can be described. Thus, it is observed that as RH increases, aerosols uptake water vapour, augment their size and consequently the åβ diminishes whereas the LR increases. The enhancement factor based on the backscatter coefficient at 532 nm, which characterizes the aerosol from hygroscopic standpoint, is also estimated. Finally, microphysical properties that are necessary for aerosol radiative forcing estimates - such as volume, effective radii, refractive index and size distribution, all vertically resolved - are retrieved using the inversion with regularization. Using this method, two hygroscopic events are described in detail. © 2015 Elsevier Ltd. Subject Urban Mobility & EnvironmentCAS - Climate, Air and SustainabilityELSS - Earth, Life and Social SciencesEnvironment & SustainabilityEnvironmentUrbanisationLidarAerosolHygroscopicityOptical propertiesMicrophysical properties To reference this document use: http://resolver.tudelft.nl/uuid:14e54dd8-0774-475d-9b4a-f3b5337d78d2 DOI https://doi.org/10.1016/j.atmosenv.2015.08.079 TNO identifier 528417 Publisher Elsevier Ltd ISSN 1352-2310 Source Atmospheric Environment, 120, 484-498 Article number 14062 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.