Articles | Volume 20, issue 24
https://doi.org/10.5194/acp-20-15793-2020
https://doi.org/10.5194/acp-20-15793-2020
Research article
 | 
18 Dec 2020
Research article |  | 18 Dec 2020

A foehn-induced haze front in Beijing: observations and implications

Ju Li, Zhaobin Sun, Donald H. Lenschow, Mingyu Zhou, Youjun Dou, Zhigang Cheng, Yaoting Wang, and Qingchun Li

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Subject: Dynamics | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Ahrens, C. D.: Meteorology Today: An Introduction to Weather, Climate and the Environment, Thomson Learning, USA, 2003. 
Brinkmann, W.: What is a foehn?, Weather, 26, 230–239, https://doi.org/10.1002/j.1477-8696.1971.tb04200.x, 1971. 
Chen, J., Li, Z., Lv, M., Wang, Y., Wang, W., Zhang, Y., Wang, H., Yan, X., Sun, Y., and Cribb, M.: Aerosol hygroscopic growth, contributing factors, and impact on haze events in a severely polluted region in northern China, Atmos. Chem. Phys., 19, 1327–1342, https://doi.org/10.5194/acp-19-1327-2019, 2019. 
Dang, R. and Liao, H.: Severe winter haze days in the Beijing–Tianjin–Hebei region from 1985 to 2017 and the roles of anthropogenic emissions and meteorology, Atmos. Chem. Phys., 19, 10801–10816, https://doi.org/10.5194/acp-19-10801-2019, 2019. 
Dong, G., Yu, L., and Hao, T.: Analysis of meteorological characteristics of heavy haze process in Tianjin in autumn and winter and the role of sea breeze, Environ. Sci. Technol., 40, 117–123, 2017 (in Chinese). 
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We analyzed a haze front event involving warm–dry downslope flow in December 2015 in Beijing, China. The haze front was formed by the collision between a clean warm–dry air mass flowing from a nearby mountainous region and a polluted cold–wet air mass over an urban area. We found that the polluted air advanced toward the clean air, resulting in a severe air pollution event. Our study highlights the need to further investigate the warm–dry downslope and its impacts on air pollution.
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