气候变化领域集成服务门户(CCPortal): Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower

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DOI	10.5194/acp-22-10567-2022
	Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower
	Li, Xiao-Bing; Yuan, Bin; Wang, Sihang; Wang, Chunlin; Lan, Jing; Liu, Zhijie; Song, Yongxin; He, Xianjun; Huangfu, Yibo; Pei, Chenglei; Cheng, Peng; Yang, Suxia; Qi, Jipeng; Wu, Caihong; Huang, Shan; You, Yingchang; Chang, Ming; Zheng, Huadan; Yang, Wenda; Wang, Xuemei; Shao, Min
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	10567
结束页码	10587
卷号	22 期号:16 页码:21
英文摘要	Volatile organic compounds (VOCs) are key precursors of ozone and particulate matter, which are the two dominant air pollutants in urban environments. However, compositions and sources of VOCs in urban air aloft have rarely been reported so far. To address this matter, highly time-resolved measurements of VOCs were made by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) at a 450 m platform on the Canton Tower in Guangzhou, China. A combination of in situ measurements and modeling techniques was used to characterize variations in and sources of VOCs. Five sources were identified from positive matrix factorization (PMF) analysis, namely daytime mixed (e.g., biogenic emissions and secondary formation), visitor-related (e.g., human breath, cooking, and volatilization of ethanol-containing products), vehicular-industrial, regional transport, and volatile chemical product (VCP) (i.e., volatilization of personal care products), contributing on average to 21 %, 30 %, 28 %, 10 %, and 11 % of total VOC (TVOC) mixing ratios, respectively. We observe that contributions of the visitor-related source, mainly composed of ethanol, followed with the variation in visitor numbers on the tower well. The VCP-dominated source only had an average contribution of similar to 5.7 ppb during the campaign, accounting for a small fraction (11 %) of TVOC mixing ratios but a large fraction (22 %) of the total OH reactivity. However, large fractions of reactive VOC species, e.g., monoterpenes (49 %), were attributed to the VCP-dominated source, indicating important contributions of VCPs to ambient concentrations of these species in urban environments. Vertical profiles of air pollutants (namely NOx, ozone, O-x and PM2.5), measured at 5, 118, 168, and 488 m, exhibited more evident gradients at night than in the daytime owing to the stronger stability of the nocturnal boundary layer. Mixing ratios of VOC species during the nighttime generally decreased with time when the 450 m platform was located in the nocturnal residual layer and markedly increased when impacted by emissions at ground level. The results in this study demonstrated composition characteristics and sources of VOCs in urban air aloft, which could provide valuable implications in making strategies for control of VOCs and secondary air pollutants.
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:000842210000001
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/273708
作者单位	Jinan University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Jinan University; Jinan University; Jinan University
推荐引用方式 GB/T 7714	Li, Xiao-Bing,Yuan, Bin,Wang, Sihang,et al. Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower[J],2022,22(16):21.
APA	Li, Xiao-Bing.,Yuan, Bin.,Wang, Sihang.,Wang, Chunlin.,Lan, Jing.,...&Shao, Min.(2022).Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(16),21.
MLA	Li, Xiao-Bing,et al."Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.16(2022):21.