气候变化领域集成服务门户(CCPortal): Organosulfates in atmospheric aerosols in shanghai, china: Seasonal and interannual variability, origin, and formation mechanisms

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DOI	10.5194/acp-21-2959-2021
	Organosulfates in atmospheric aerosols in shanghai, china: Seasonal and interannual variability, origin, and formation mechanisms
	Wang Y.; Zhao Y.; Wang Y.; Yu J.Z.; Shao J.; Liu P.; Zhu W.; Cheng Z.; Li Z.; Yan N.; Xiao H.
发表日期	2021
ISSN	1680-7316
起始页码	2959
结束页码	2980
卷号	21 期号:4
英文摘要	Organosulfates (OSs) are ubiquitous in the atmosphere and serve as important tracers for secondary organic aerosols (SOAs). Despite intense research over the years, the abundance, origin, and formation mechanisms of OSs in ambient aerosols, particularly in regions with severe anthropogenic pollution, are still not well understood. In this study, we collected filter samples of ambient fine particulate matter (PM2.5) over four seasons in both 2015-2016 and 2018-2019 at an urban site in Shanghai, China, and comprehensively characterized the OS species in these PM2.5 samples using an ultra-performance liquid chromatography quadrupole timeof-flight mass spectrometer equipped with an electrospray ionization (ESI) source (UPLC-ESI-QToFMS). Overall, we find that while the concentration of organic aerosols (OAs) decreased by 29 % in 2018-2019 compared to that in 2015-2016, mainly as a result of the reduction of anthropogenic pollutant emissions in eastern China, the annually averaged concentrations of 35 quantified OSs were similar in both years (65.5 ± 77.5 ng m-3 , 0.57 % ± 0.56 % of OA in 2015-2016 vs. 59.4 ± 79.7 ng m-3 , 0.66 % ± 0.56 % of OA in 2018-2019), suggesting an increased contribution of SOAs to OAs in 2018-2019 compared to 2015-2016. Isoprene-and monoterpene-derived OSs were the two most abundant OS families, on average, accounting for 36.3 % and 31.0 % of the quantified OS concentrations, respectively, during both sampling years, suggesting an important contribution of biogenic emissions to the production of OSs and SOAs in Shanghai. The abundance of biogenic OSs, particularly those arising from isoprene, exhibited strong seasonality (peaked in summer) but no significant interannual variability. In contrast, the quantified anthropogenic OSs had little seasonal variability and declined in 2018-2019 compared with those in 2015-2016. The C2 and C3 OS species that have both biogenic and anthropogenic origins contributed, on average, 19.0 % of the quantified OSs, with C2H3O6S-, C3H5O5S-, and C3H5O6S-being the most abundant species, together accounting for 76 % of the C2 and C3 OS concentrations in 2015-2016 and 2018-2019. 2-Methyltetrol sulfate (2-MTS, C5H11O7S-) and monoterpene-derived C10H16NO7S-were the most abundant OSs and nitrooxy OSs in summer, on average, contributing 31 % and 5 % of the quantified OSs, respectively, during the summertime of the sampling years. The substantially larger concentration ratio of 2-MTS to 2-methylglyceric acid sulfate (2-MAS, C4H7O7S-) in summer (6.8-7.8) compared to the other seasons (0.31-0.78) implies that low-NOx oxidation pathways played a dominant role in isoprene-derived SOA formation in summer, while highNOx reaction pathways were more important in other seasons. We further find that the production of OSs was largely controlled by the level of Ox (Ox= O3+NO2), namely the photochemistry of OS precursors, particularly in summer, though sulfate concentration, aerosol acidity, and aerosol liquid water content (ALWC) that could affect the heterogeneous chemistry of reactive intermediates leading to OS for mation also played a role. Our study provides valuable insights into the characteristics and mechanisms of OS formation in a typical Chinese megacity and implies that the mitigation of Ox pollution can effectively reduce the production of OSs and SOAs in eastern China. ©
语种	英语
scopus关键词	aerosol formation; annual variation; biogenic emission; concentration (composition); liquid chromatography; organic compound; particulate matter; pollution control; seasonal variation; China; Shanghai
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/247109
作者单位	School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong, Hong Kong; Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, Hong Kong; College of Flight Technology, Civil Aviation University of China, Tianjin, 300300, China
推荐引用方式 GB/T 7714	Wang Y.,Zhao Y.,Wang Y.,et al. Organosulfates in atmospheric aerosols in shanghai, china: Seasonal and interannual variability, origin, and formation mechanisms[J],2021,21(4).
APA	Wang Y..,Zhao Y..,Wang Y..,Yu J.Z..,Shao J..,...&Xiao H..(2021).Organosulfates in atmospheric aerosols in shanghai, china: Seasonal and interannual variability, origin, and formation mechanisms.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Wang Y.,et al."Organosulfates in atmospheric aerosols in shanghai, china: Seasonal and interannual variability, origin, and formation mechanisms".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).