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DOI	10.5194/acp-19-10557-2019
	NH3-promoted hydrolysis of NO2 induces explosive growth in HONO
	Xu W.; Kuang Y.; Zhao C.; Tao J.; Zhao G.; Bian Y.; Yang W.; Yu Y.; Shen C.; Liang L.; Zhang G.; Lin W.; Xu X.
发表日期	2019
ISSN	16807316
起始页码	10557
结束页码	10570
卷号	19 期号:16
英文摘要	The study of atmospheric nitrous acid (HONO), which is the primary source of OH radicals, is crucial with respect to understanding atmospheric photochemistry and heterogeneous chemical processes. Heterogeneous NO2 chemistry under haze conditions has been identified as one of the missing sources of HONO on the North China Plain, and also produces sulfate and nitrate. However, controversy exists regarding the various proposed HONO production mechanisms, mainly regarding whether SO2 directly takes part in the HONO production process and what roles NH3 and the pH value play. In this paper, never before seen explosive HONO production was reported and evidence was found - for the first time in field measurements during fog (usually with 4< pH <6) and haze episodes under high relative humidity (pH≈4) - that NH3 was the key factor that promoted the hydrolysis of NO2, leading to the explosive growth of HONO and nitrate under both high and relatively lower pH conditions. The results also suggest that SO2 plays a minor or insignificant role in HONO formation during fog and haze events, but was indirectly oxidized upon the photolysis of HONO via subsequent radical mechanisms. Aerosol hygroscopicity significantly increased with rapid inorganic secondary aerosol formation, further promoting HONO production as a positive feedback. For future photochemical and aerosol pollution abatement, it is crucial to introduce effective NH3 emission control measures, as NH3-promoted NO2 hydrolysis is a large daytime HONO source, releasing large amounts of OH radicals upon photolysis, which will contribute largely to both atmospheric photochemistry and secondary aerosol formation. © 2019 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; haze; hydrolysis; hydroxyl radical; nitrate; nitrous oxide; photochemistry; relative humidity; sulfate
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144205
作者单位	State Key Laboratory of Severe Weather, Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
推荐引用方式 GB/T 7714	Xu W.,Kuang Y.,Zhao C.,et al. NH3-promoted hydrolysis of NO2 induces explosive growth in HONO[J],2019,19(16).
APA	Xu W..,Kuang Y..,Zhao C..,Tao J..,Zhao G..,...&Xu X..(2019).NH3-promoted hydrolysis of NO2 induces explosive growth in HONO.Atmospheric Chemistry and Physics,19(16).
MLA	Xu W.,et al."NH3-promoted hydrolysis of NO2 induces explosive growth in HONO".Atmospheric Chemistry and Physics 19.16(2019).