Unprecedented Ambient Sulfur Trioxide (SO3) Detection: Possible Formation Mechanism and Atmospheric Implications

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	Unprecedented Ambient Sulfur Trioxide (SO3) Detection: Possible Formation Mechanism and Atmospheric Implications
	Yao, Lei; Fan, Xiaolong; Yan, Chao; Kurten, Theo; Daellenbach, Kaspar R.; Li, Chang; Wang, Yonghong; Guo, Yishuo; Dada, Lubna; Rissanen, Matti P.
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
	2020-11-10
卷号	7 期号:11 页码:809-818
ISSN号	2328-8930
英文摘要	Sulfur trioxide (SO3) is a crucial compound for atmospheric sulfuric acid (H2SO4) formation, acid rain formation, and other atmospheric physicochemical processes. During the daytime, SO3 is mainly produced from the photo-oxidation of SO2 by OH radicals. However, the sources of SO3 during the early morning and night, when OH radicals are scarce, are not fully understood. We report results from two field measurements in urban Beijing during winter and summer 2019, using a nitrate-CI-APi-LTOF (chemical ionization-atmospheric pressure interface-long-time-offlight) mass spectrometer to detect atmospheric SO3 and H2SO4. Our results show the level of SO3 was higher during the winter than during the summer, with high SO3 levels observed especially during the early morning (similar to 05:00 to similar to 08:30) and night (similar to 18:00 to similar to 05:00 the next day). On the basis of analysis of SO2, NOx, black carbon, traffic flow, and atmospheric ions, we suggest SO3 could be formed from the catalytic oxidation of SO2 on the surface of traffic-related black carbon. This previously unidentified SO3 source results in significant H2SO4 formation in the early morning and thus promotes sub-2.5 nm particle formation. These findings will help in understanding urban SO3 and formulating policies to mitigate secondary particle formation in Chinese megacities.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44559]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Yao, Lei,Fan, Xiaolong,Yan, Chao,et al. Unprecedented Ambient Sulfur Trioxide (SO3) Detection: Possible Formation Mechanism and Atmospheric Implications[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,2020,7(11):809-818.
APA	Yao, Lei.,Fan, Xiaolong.,Yan, Chao.,Kurten, Theo.,Daellenbach, Kaspar R..,...&Bianchi, Federico.(2020).Unprecedented Ambient Sulfur Trioxide (SO3) Detection: Possible Formation Mechanism and Atmospheric Implications.ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,7(11),809-818.
MLA	Yao, Lei,et al."Unprecedented Ambient Sulfur Trioxide (SO3) Detection: Possible Formation Mechanism and Atmospheric Implications".ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS 7.11(2020):809-818.