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Assessment of the Sphericity of Submicrometer Particles Using a Single-particle Polar Nephelometer at an Urban Site in Japan

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Title: Assessment of the Sphericity of Submicrometer Particles Using a Single-particle Polar Nephelometer at an Urban Site in Japan
Authors: Nakagawa, Maho / Nakayama, Tomoki / Sasago, Hiroshi / Kuruma, Yuki / Yai, Hikari / Ogawa, Shuhei / Deng, Yange / Mochida, Michihiro / Matsumi, Yutaka
Issue Date: 8-Jul-2020
Publisher: Taiwan Association for Aerosol Research
Citation: Aerosol and Air Quality Research, 20(11), pp.2474-2484; 2020
Abstract: he sphericity of particles must be considered when evaluating their effects on the climate and human health. Thus, to examine this property and its controlling factors, this study measured the scattering angular distributions of both thermodenuded and non-thermodenuded individual particles with a diameter of 500 nm in real time using a home-made polar nephelometer in Nagoya, Japan. Estimating the sphericities based on the depths of the local minima in the scattering angular distributions, we found the ambient aerosols to be external mixtures of at least two types of particles, one with relatively high and the other with relatively low sphericity. Although most of the particles exhibiting high sphericity were removed as they passed through the thermodenuder, approximately one-third of the fraction exhibiting low sphericity remained. During the daytime, the proportion of the low-sphericity particles decreased, whereas the average sphericity of the high-sphericity particles increased, which can be attributed to photochemical formation and/or aging processes. On days with extremely high relative humidity, the diurnal variation in the average sphericity displayed another peak during the early morning, which may have been due to the secondary formation of nitrate.
Keywords: Particle sphericity / Polar nephelometer / Scattering angular distribution / Single particle
URI: http://hdl.handle.net/10069/40397
ISSN: 16808584
DOI: 10.4209/aaqr.2020.01.0023
Rights: © The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/40397

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