A method for estimating the fraction of mineral dust in particulate matter using PM2.5-to-PM10 ratios--颗粒学报PARTICUOLOGY

Sugimoto, N., Shimizu, A., Matsui, I., & Nishikawa, M. (2016). A method for estimating the fraction of mineral dust in particulate matter using PM2.5-to-PM10 ratios. Particuology, 28, 114-120. https://doi.org/10.1016/j.partic.2015.09.005

A method for estimating the fraction of mineral dust in particulate matter using PM_2.5-to-PM₁₀ ratios

Nobuo Sugimoto ^a *, Atsushi Shimizu ^a, Ichiro Matsui ^a, Masataka Nishikawa ^b

a Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
b Tokyo University of Science, Environmental Safety Center, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

10.1016/j.partic.2015.09.005

Volume 28, October 2016, Pages 114-120

Received 9 March 2015, Revised 16 September 2015, Accepted 30 September 2015, Available online 8 December 2015, Version of Record 4 August 2016.

E-mail: nsugimot@nies.go.jp

Highlights

• A method using the PM_2.5/PM₁₀ ratio to estimate dust fraction in PM_2.5 was presented.

• Estimated dust fraction was consistent with lidar depolarization ratio measurements.

• The method is useful for indicating dust and its mixing with anthropogenic aerosols.

Abstract

A simple method for estimating the contributions of mineral dust to PM_2.5, PM₁₀, or TSP is presented. The method is based on the assumption of external mixing of two types of particles with different PM_2.5/PM₁₀ ratios. The method was applied to local and transported dust events observed in Tsukuba, Japan, and was compared with collocated polarization lidar measurements. The method was then applied to three dust events that occurred in Oki, Rishiri, and Ochiishi, Japan, in 2012. The results showed that the method was useful for detecting mineral dust and for qualitatively describing the mixing of dust with anthropogenic aerosols.

Graphical abstract

Keywords

Mineral dust; PM_2.5 dust fraction; PM_2.5 to PM₁₀ ratio; Atmospheric mixing; Lidar; Depolarization ratio

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