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

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

Eichler, H. / Cheng, Y.F. / Birmili, W. / Nowak, A. / Wiedensohler, A. / Brüggemann, E. / Gnauk, T. / Herrmann, H. / Althausen, D. / Ansmann, A. / ... [more]

Abstract

AbstractDuring the “Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2004 (PRIDE-PRD2004)” hygroscopic properties of particles in the diameter range 22nm to $10 μ m$ 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.

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

Eichler, H. / Cheng, Y.F. / Birmili, W. / Nowak, A. / Wiedensohler, A. / Brüggemann, E. / Gnauk, T. / Herrmann, H. / Althausen, D. / Ansmann, A. / ... [more]

Abstract

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

Eichler, H. / Cheng, Y.F. / Birmili, W. / Nowak, A. / Wiedensohler, A. / Brüggemann, E. / Gnauk, T. / Herrmann, H. / Althausen, D. / Ansmann, A. / ... [more]