气候变化领域集成服务门户(CCPortal): Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol

CCPortal

DOI	10.5194/acp-22-10077-2022
	Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol
	Guo, Yishuo; Yan, Chao; Liu, Yuliang; Qiao, Xiaohui; Zheng, Feixue; Zhang, Ying; Zhou, Ying; Li, Chang; Fan, Xiaolong; Lin, Zhuohui; Feng, Zemin; Zhang, Yusheng; Zheng, Penggang; Tian, Linhui; Nie, Wei; Wang, Zhe; Huang, Dandan; Daellenbach, Kaspar R.; Yao, Lei; Dada, Lubna; Bianchi, Federico; Jiang, Jingkun; Liu, Yongchun; Kerminen, Veli-Matti; Kulmala, Markku
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	10077
结束页码	10097
卷号	22 期号:15 页码:21
英文摘要	Oxygenated organic molecules (OOMs) are crucial for atmospheric new particle formation and secondary organic aerosol (SOA) growth. Therefore, understanding their chemical composition, temporal behavior, and sources is of great importance. Previous studies on OOMs mainly focus on environments where biogenic sources are predominant, yet studies on sites with dominant anthropogenic emissions, such as megacities, have been lacking. Here, we conducted long-term measurements of OOMs, covering four seasons of the year 2019, in urban Beijing. The OOM concentration was found to be the highest in summer (1.6 x 10(8) cm(-3)), followed by autumn (7.9 x 10(7) cm(-3)), spring (5.7 x 10(7) cm(-3)) and winter (2.3 x 10(7) cm(-3)), suggesting that enhanced photo-oxidation together with the rise in temperature promote the formation of OOMs. Most OOMs contained 5 to 10 carbon atoms and 3 to 7 effective oxygen atoms (nO(eff) = nO - 2 x nN). The average nO(eff )increased with increasing atmospheric photo-oxidation capacity, which was the highest in summer and the lowest in winter and autumn. By performing a newly developed workflow, OOMs were classified into the following four types: aromatic OOMs, aliphatic OOMs, isoprene OOMs, and monoterpene OOMs. Among them, aromatic OOMs (29 %-41 %) and aliphatic OOMs (26 %-41 %) were the main contributors in all seasons, indicating that OOMs in Beijing were dominated by anthropogenic sources. The contribution of isoprene OOMs increased significantly in summer (33 %), which is much higher than those in the other three seasons (8 %-10 %). Concentrations of isoprene (0.2-5.3 x 10(7) cm(-3)) and monoterpene (1.1-8.4 x 10(6) cm(-3)) OOMs in Beijing were lower than those reported at other sites, and they possessed lower oxygen and higher nitrogen contents due to high NO, levels (9.5-38.3 ppbv - parts per billion by volume) in Beijing. With regard to the nitrogen content of the two anthropogenic OOMs, aromatic OOMs were mainly composed of CHO and CHON species, while aliphatic OOMs were dominated by CHON and CHON2 ones. Such prominent differences suggest varying formation pathways between these two OOMs. By combining the measurements and an aerosol dynamic model, we estimated that the SOA growth rate through OOM condensation could reach 0.64, 0.61, 0.41, and 0.30 mu g m(-3) h(-1) in autumn, summer, spring, and winter, respectively. Despite the similar concentrations of aromatic and aliphatic OOMs, the former had lower volatilities and, therefore, showed higher contributions (46 %-62 %) to SOA than the latter (14 %-32 %). By contrast, monoterpene OOMs and isoprene OOMs, limited by low abundances or high volatilities, had low contributions of 8 %-12 % and 3 %-5 %, respectively. Overall, our results improve the understanding of the concentration, chemical composition, seasonal variation, and potential atmospheric impacts of OOMs, which can help formulate refined restriction policy specific to SOA control in urban areas.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000836330300001
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/273196
作者单位	Beijing University of Chemical Technology; Nanjing University; University of Helsinki; Tsinghua University; Hong Kong University of Science & Technology; Hong Kong Polytechnic University; University of Macau; Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute
推荐引用方式 GB/T 7714	Guo, Yishuo,Yan, Chao,Liu, Yuliang,et al. Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol[J],2022,22(15):21.
APA	Guo, Yishuo.,Yan, Chao.,Liu, Yuliang.,Qiao, Xiaohui.,Zheng, Feixue.,...&Kulmala, Markku.(2022).Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(15),21.
MLA	Guo, Yishuo,et al."Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.15(2022):21.