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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-961
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
24 Nov 2016
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Ground based characterization of spectral optical properties of haze and Asian dust episodes under Asian continental outflow during winter 2014
Jinsang Jung1, JeongAh Yu2, Youngsook Lyu2, Minhee Lee2, Taekyung Hwang2, and Sangil Lee1 1Center for Gas Analysis, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
2Department of Climate and Air Quality Research, National Institute of Environmental Research, Daejeon 34944, Republic of Korea
Abstract. An intensive field campaign was conducted in a downwind area of the Asian continental outflow (Daejeon, Korea) during winter 2014 to characterize the spectral optical properties of severe haze and Asian dust episodes. High concentrations of PM10 (particulate matter with a diameter ≤ 10 µm) and light scattering coefficients at 550 nm, σs,550, were observed during a long-range transport (LRT) haze episode (PM10 = 163.9 ± 25.0 μg/m3; σs,550 = 503.4 ± 60.5 Mm−1) and Asian dust episode (PM10 = 211.3 ± 57.5 μg/m3; σs,550 = 560.9 ± 151 Mm−1). During the LRT haze episode, no significant change in the relative contribution of PM2.5 (particulate matter with a diameter ≤ 2.5 µm) chemical components was observed as particles accumulated under stagnant atmospheric conditions (January 13−17, 2014), suggesting that the increase in PM2.5 mass concentration was caused mainly by the accumulation of LRT pollutants. On the other hand, a gradual decrease in Ångström exponent (Å), gradual increase in single scattering albedo (ω) and mass scattering efficiency (MSE) were observed during the stagnant period, possibly due to an increase in particle size. During the Asian dust episode, a low PM2.5/PM10 ratio and Å(450/700) were observed with average values of 0.59 ± 0.06 and 1.08 ± 0.14, respectively, which were higher than those during the LRT haze episode (0.75 ± 0.06 and 1.39 ± 0.05, respectively), indicating that PM2.5/PM10 mass ratios and Å(450/700) can be used as tracers to distinguish aged LRT haze and Asian dust under the Asian continental outflow.

Citation: Jung, J., Yu, J., Lyu, Y., Lee, M., Hwang, T., and Lee, S.: Ground based characterization of spectral optical properties of haze and Asian dust episodes under Asian continental outflow during winter 2014, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-961, in review, 2016.
Jinsang Jung et al.
Jinsang Jung et al.
Jinsang Jung et al.

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Short summary
No significant change in PM2.5 chemical components was observed during the accumulation. Increase in single scattering albedo is mainly due to an increase in particle size. Å of scattering can be used as tracers to distinguish transported haze and Asian dust.
No significant change in PM2.5 chemical components was observed during the...
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