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| 001 | 866667 | ||
| 005 | 20240712100948.0 | ||
| 024 | 7 | _ | |a 10.1021/acs.est.9b02422 |2 doi |
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| 024 | 7 | _ | |a 1520-5851 |2 ISSN |
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| 100 | 1 | _ | |a Lu, Keding |0 0000-0001-9425-9520 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Fast Photochemistry in Wintertime Haze: Consequences for Pollution Mitigation Strategies |
| 260 | _ | _ | |a Columbus, Ohio |c 2019 |b American Chemical Society |
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| 520 | _ | _ | |a 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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| 700 | 1 | _ | |a Hofzumahaus, Andreas |0 P:(DE-Juel1)16326 |b 2 |
| 700 | 1 | _ | |a Tan, Zhaofeng |0 P:(DE-Juel1)173726 |b 3 |
| 700 | 1 | _ | |a Wang, Haichao |0 0000-0001-6161-1874 |b 4 |
| 700 | 1 | _ | |a Zhang, Lin |0 0000-0003-2383-8431 |b 5 |
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| 700 | 1 | _ | |a Holland, Frank |0 P:(DE-Juel1)16342 |b 13 |
| 700 | 1 | _ | |a Li, Xin |b 14 |
| 700 | 1 | _ | |a Liu, Ying |b 15 |
| 700 | 1 | _ | |a Liu, Yuhan |0 P:(DE-HGF)0 |b 16 |
| 700 | 1 | _ | |a Ma, Xuefei |0 P:(DE-Juel1)168298 |b 17 |
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| 700 | 1 | _ | |a Wu, Yusheng |0 P:(DE-HGF)0 |b 21 |
| 700 | 1 | _ | |a Wu, Zhijun |0 0000-0001-8910-5674 |b 22 |
| 700 | 1 | _ | |a Zeng, Limin |0 P:(DE-HGF)0 |b 23 |
| 700 | 1 | _ | |a Hu, Min |b 24 |
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| 700 | 1 | _ | |a Zhang, Yuanhang |0 P:(DE-HGF)0 |b 27 |
| 773 | _ | _ | |a 10.1021/acs.est.9b02422 |g Vol. 53, no. 18, p. 10676 - 10684 |0 PERI:(DE-600)1465132-4 |n 18 |p 10676 - 10684 |t Environmental science & technology |v 53 |y 2019 |x 1520-5851 |
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