Puzzling Haze Events in China During the Coronavirus (COVID-19) Shutdown

Chang, Yunhua and Huang, Ru-Jin and Ge, Xinlei and Huang, Xiangpeng and Hu, Jianlin and Duan, Yusen and Zou, Zhong and Liu, Xuejun and Lehmann, Moritz F.. (2020) Puzzling Haze Events in China During the Coronavirus (COVID-19) Shutdown. Geophysical Research Letters, 47 (12). e2020GL088533.

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Official URL: https://edoc.unibas.ch/80345/

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It is a puzzle as to why more severe haze formed during the New Year Holiday in 2020 (NYH‐20), when China was in an unprecedented state of shutdown to contain the coronavirus (COVID‐19) outbreak, than in 2019 (NYH‐19). We performed a comprehensive measurement and modeling analysis of the aerosol chemistry and physics at multiple sites in China (mainly in Shanghai) before, during, and after NYH‐19 and NYH‐20. Much higher secondary aerosol fraction in PM2.5 were observed during NYH‐20 (73%) than during NYH‐19 (59%). During NYH‐20, PM2.5 levels correlated significantly with the oxidation ratio of nitrogen (r2 = 0.77, p < 0.01), and aged particles from northern China were found to impede atmospheric new particle formation and growth in Shanghai. A markedly enhanced efficiency of nitrate aerosol formation was observed along the transport pathways during NYH‐20, despite the overall low atmospheric NO2 levels.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Aquatic and Isotope Biogeochemistry (Lehmann)
UniBasel Contributors:Lehmann, Moritz F
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Geopyhsical Union
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 10:37
Deposited On:14 Apr 2021 10:37

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