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

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http://hdl.handle.net/10138/324254

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Yao , L , Fan , X , Yan , C , Kurten , T , Dällenbach , K , Li , C , Wang , Y , Guo , Y , Dada , L , Rissanen , M P , Cai , J , Tham , Y J , Zha , Q , Zhang , S , Du , W , Yu , M , Zheng , F , Zhou , Y , Kontkanen , J , Chan , T , Shen , J , Kujansuu , J T , Kangasluoma , J , Jiang , J , Wang , L , Worsnop , D R , Petäjä , T , Kerminen , V-M , Liu , Y , Chu , B , He , H , Kulmala , M & Bianchi , F 2020 , ' Unprecedented Ambient Sulfur Trioxide (SO3) Detection : Possible Formation Mechanism and Atmospheric Implications ' , Environmental Science & Technology Letters , vol. 7 , no. 11 , pp. 809-818 . https://doi.org/10.1021/acs.estlett.0c00615

Title: Unprecedented Ambient Sulfur Trioxide (SO3) Detection : Possible Formation Mechanism and Atmospheric Implications
Author: Yao, Lei; Fan, Xiaolong; Yan, Chao; Kurten, Theo; Dällenbach, Kaspar; Li, Chang; Wang, Yonghong; Guo, Yishuo; Dada, Lubna; Rissanen, Matti P.; Cai, Jing; Tham, Yee Jun; Zha, Qiaozhi; Zhang, Shaojun; Du, Wei; Yu, Miao; Zheng, Feixue; Zhou, Ying; Kontkanen, Jenni; Chan, Tommy; Shen, Jiali; Kujansuu, Joni T.; Kangasluoma, Juha; Jiang, Jingkun; Wang, Lin; Worsnop, Douglas R.; Petäjä, Tuukka; Kerminen, Veli-Matti; Liu, Yongchun; Chu, Biwu; He, Hong; Kulmala, Markku; Bianchi, Federico
Contributor: University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Department of Chemistry
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Air quality research group
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Air quality research group
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physics
University of Helsinki, Aerodyne Research Inc.
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Global Atmosphere-Earth surface feedbacks
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2020-11-10
Language: eng
Number of pages: 10
Belongs to series: Environmental Science & Technology Letters
ISSN: 2328-8930
URI: http://hdl.handle.net/10138/324254
Abstract: 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.
Subject: 114 Physical sciences
116 Chemical sciences
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