Hygroscopic properties and extinction of aerosol particles at ambient relative humidity in South-Eastern China

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• 作者：H. Eichler ; Y.F. Cheng ; W. Birmili ; A. Nowak ; A. Wiedensohler ; E. Brü ; ggemann ; T. Gnauk ; H. Herrmann ; D. Althausen ; A. Ansmann ; R. Engelmann ; M. Tesche ; M. Wendisch ; Y.H. Zhang ; M. Hu ; S. Liu ; L.M
• 关键词：Hygroscopicity ; Descriptive hygroscopic growth factor ; H-DMPS ; PRD ; Particle extinction coefficient
• 刊名：Atmospheric Environment
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：42
• 期：25
• 页码：6321-6334
• 全文大小：750 K

文摘

During the “Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2004 (PRIDE-PRD2004)” hygroscopic properties of particles in the diameter range 22 nm to were determined. For that purpose, a Humidifying Differential Mobility Particle Sizer (H-DMPS) and a Micro-Orifice Uniform Deposition Impactor (MOUDI) were operated. The derived size-dependent particle hygroscopic growth factors were interpolated to ambient relative humidity (RH) and used to calculate the particle number size distributions (PNSDs) at ambient conditions. A comparison between the modeled particle extinction coefficients (σ_ext,Mie) and those observed with a Raman lidar was made. It is shown that the particle extinction coefficient (σ_ext) at ambient RH can be properly estimated with Mie-model calculations based on the in situ physico-chemical measurements of dry and humidified PNSD and chemical composition.