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Wang, Junfeng; Li, Jingyi; Ye, Jianhuai; Zhao, Jian; Wu, Yangzhou; Hu, Jianlin; Liu, Dantong; Nie, Dongyang; Shen, Fuzhen; Huang, Xiangpeng; Huang, Dan Dan; Ji, Dongsheng; Sun, Xu; Xu, Weiqi; Guo, Jianping; Song, Shaojie; Qin, Yiming; Liu, Pengfei; Turner, Jay R.; Lee, Hyun Chul; Hwang, Sungwoo; Liao, Hong; Martin, Scot T.; Zhang, Qi; Chen, Mindong; Sun, Yele; Ge, Xinlei; Jacob, Daniel J.
Nature communications, 06/2020, Letnik: 11, Številka: 1Journal Article
Abstract Severe events of wintertime particulate air pollution in Beijing (winter haze) are associated with high relative humidity (RH) and fast production of particulate sulfate from the oxidation of sulfur dioxide (SO 2 ) emitted by coal combustion. There has been considerable debate regarding the mechanism for SO 2 oxidation. Here we show evidence from field observations of a haze event that rapid oxidation of SO 2 by nitrogen dioxide (NO 2 ) and nitrous acid (HONO) takes place, the latter producing nitrous oxide (N 2 O). Sulfate shifts to larger particle sizes during the event, indicative of fog/cloud processing. Fog and cloud readily form under winter haze conditions, leading to high liquid water contents with high pH (>5.5) from elevated ammonia. Such conditions enable fast aqueous-phase oxidation of SO 2 by NO 2 , producing HONO which can in turn oxidize SO 2 to yield N 2 O.This mechanism could provide an explanation for sulfate formation under some winter haze conditions.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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