Graphical Abstract

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Uchiyama, A., B. Chen, A. Yamazaki, G. Shi, R. Kudo, C. Nishita-Hara, M. Hayashi, A. Habib, and T. Matsunaga, 2018: Aerosol optical characteristics in Fukuoka and Beijing measured by integrating nephelometer and aethalometer: Comparison of source and downstream regions. J. Meteor. Soc. Japan, 96, 215-240.
https://doi.org/10.2151/jmsj.2018-026   Graphical Abstract with highlights

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Highlights:

• The aerosol optical characteristics in the East Asian cities of Fukuoka and Beijing were measured from 2010 to 2014. Previously, few long-term, season-crossing observations have been reported.
• In Fukuoka, the annual means of the extinction, scattering, and absorption coefficients C_ext (525 nm), C_sca (525 nm), and C_abs (520 nm) were 74.6, 66.1, and 8.1 Mm₋₁, respectively, whereas those in Beijing were 412.1, 367.2, and 42.4 Mm₋₁, respectively (Fig. 1). The single-scattering albedos ω₀ (525 nm) in the two cities were 0.877 and 0.868, respectively (Fig. 2). The asymmetry factors G (525 nm) in the two cities were 0.599 and 0.656, respectively. The extinction Ångström exponents α_ext in the two cities were 1.555 and 0.855, respectively. The absorption Ångström exponents α_abs in the two cities were 1.106 and 0.977, respectively.
• C_ext, C_sca, and C_abs showed a seasonal variation in both cities. Some aerosol properties also showed a seasonal variation. In particular, the seasonal variation in α_abs was clear in both cities; it tended to be small in summer and large in winter (Fig. 3).