Journal Article

FZJ-2019-05746

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fast Photochemistry in Wintertime Haze: Consequences for Pollution Mitigation Strategies

Lu, K. (Corresponding author) ; Fuchs, H.FZJ* ; Hofzumahaus, A.FZJ* ; Tan, Z.FZJ* ; Wang, H. ; Zhang, L. ; Schmitt, S. H.FZJ* ; Rohrer, F.FZJ* ; Bohn, B.FZJ* ; Broch, S. ; Dong, H. ; Gkatzelis, G. I.FZJ* ; Hohaus, T.FZJ* ; Holland, F.FZJ* ; Li, X. ; Liu, Y. ; Liu, Y. ; Ma, X. ; Novelli, A.FZJ* ; Schlag, P. ; Shao, M. ; Wu, Y. ; Wu, Z. ; Zeng, L. ; Hu, M. ; Kiendler-Scharr, A.FZJ* ; Wahner, A.FZJ* ; Zhang, Y.

2019
American Chemical Society Columbus, Ohio

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Please use a persistent id in citations: doi:10.1021/acs.est.9b02422

Abstract: In contrast to summer smog, the contribution of photochemistry to the formation of winter haze in northern mid-to-high latitude is generally assumed to be minor due to reduced solar UV and water vapor concentrations. Our comprehensive observations of atmospheric radicals and relevant parameters during several haze events in winter 2016 Beijing, however, reveal surprisingly high hydroxyl radical oxidation rates up to 15 ppbv/h, which is comparable to the high values reported in summer photochemical smog and is two to three times larger than those determined in previous observations during winter in Birmingham (Heard et al. Geophys. Res. Lett. 2004, 31, (18)), Tokyo (Kanaya et al. J. Geophys. Res.: Atmos. 2007, 112, (D21)), and New York (Ren et al. Atmos. Environ. 2006, 40, 252–263). The active photochemistry facilitates the production of secondary pollutants. It is mainly initiated by the photolysis of nitrous acid and ozonolysis of olefins and maintained by an extremely efficiently radical cycling process driven by nitric oxide. This boosted radical recycling generates fast photochemical ozone production rates that are again comparable to those during summer photochemical smog. The formation of ozone, however, is currently masked by its efficient chemical removal by nitrogen oxides contributing to the high level of wintertime particles. The future emission regulations, such as the reduction of nitrogen oxide emissions, therefore are facing the challenge of reducing haze and avoiding an increase in ozone pollution at the same time. Efficient control strategies to mitigate winter haze in Beijing may require measures similar as implemented to avoid photochemical smog in summer.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. 243 - Tropospheric trace substances and their transformation processes (POF3-243) (POF3-243)

Appears in the scientific report 2019

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Database coverage:
; BIOSIS Previews ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection ; Zoological Record

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