气候变化领域集成服务门户(CCPortal): Characteristics of peroxyacetyl nitrate (PAN) in the high-elevation background atmosphere of South-Central China: Implications for regional photochemical pollution

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DOI	10.1016/j.atmosenv.2021.118424
	Characteristics of peroxyacetyl nitrate (PAN) in the high-elevation background atmosphere of South-Central China: Implications for regional photochemical pollution
	Daocheng Gong; Liao M.; Wu G.; Wang H.; Li Q.; Chen Y.; Deng S.; Zheng Y.; Ou J.; Wang B.
发表日期	2021
ISSN	1352-2310
卷号	254
英文摘要	Over the past decade, secondary pollution characterized by active photochemistry has sharply increased and become the major contributor to air pollution in China, despite the great reduction of primary emissions. Peroxyacetyl nitrate (PAN) is an excellent indicator of photochemical pollution. Observation of PAN in high-elevation atmosphere offers a rare opportunity to understand the degree of photochemical activity in a wide region. In this study, we conducted a field campaign at a high-altitude (1690 m a.s.l.) national background site on the border of South and Central China during photochemically polluted seasons (Sep–Nov 2018). PAN showed significantly higher concentrations than other high-elevation sites worldwide, with hourly mean and maximum values of 0.52 ± 0.45 ppbv and 2.33 ppbv, respectively. Episodes with much higher PAN levels (1.03 ± 0.40 ppbv) than backgrounds (0.24 ± 0.13 ppbv) were captured. Nighttime peaks suggested mixed impacts of regional transport and VOCs oxidation by nitrate radical and O3. High background O3 (44.30 ± 0.44 ppbv) was derived from the significant positive correlation of O3 with PAN. Contributions of downward transported PAN from upper troposphere were found to be non-negligible. Further analyses revealed that regional transport from Central China contributed substantially to the high levels of PAN, with only a minor contribution coming from the south where the Pearl River Delta (PRD) metropolitan region is located. Our results might indicate the great achievement in air quality improvement in the PRD, and also suggest that a strategic shift of control focus from metropolitan to developing areas is urgently needed for mitigating the severe photochemical pollution in China. © 2021 The Author(s)
关键词	Background atmosphere Background ozone Central China Nanling mountains Regional transport Secondary pollution
语种	英语
scopus关键词	Air pollution control; Air quality; Nitrates; River pollution; Background atmosphere; Background ozones; Central chinas; High elevation; Nanling mountain; Pearl River delta; Peroxyacetyl nitrates; Photochemical pollution; Regional transport; Secondary pollution; Peroxides; nitric oxide; nitrogen dioxide; ozone; peroxyacetylnitrate; air quality; atmospheric pollution; atmospheric transport; background level; concentration (composition); elevation; oxidation; peroxyacetyl nitrate; photochemistry; regional geography; troposphere; air pollution; altitude; Article; atmosphere; China; circadian rhythm; humidity; meteorology; photochemistry; photolysis; pollution; priority journal; temperature; wind speed; China; Guangdong; Zhujiang Delta; Indicator indicator
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248435
作者单位	Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China; JNU-QUT Joint Laboratory for Air Quality Science and Management, Jinan University, Guangzhou, 511443, China; Shaoguan Ecological Environmental Monitoring Center Station, Shaoguan, 512026, China
推荐引用方式 GB/T 7714	Daocheng Gong,Liao M.,Wu G.,et al. Characteristics of peroxyacetyl nitrate (PAN) in the high-elevation background atmosphere of South-Central China: Implications for regional photochemical pollution[J],2021,254.
APA	Daocheng Gong.,Liao M..,Wu G..,Wang H..,Li Q..,...&Wang B..(2021).Characteristics of peroxyacetyl nitrate (PAN) in the high-elevation background atmosphere of South-Central China: Implications for regional photochemical pollution.ATMOSPHERIC ENVIRONMENT,254.
MLA	Daocheng Gong,et al."Characteristics of peroxyacetyl nitrate (PAN) in the high-elevation background atmosphere of South-Central China: Implications for regional photochemical pollution".ATMOSPHERIC ENVIRONMENT 254(2021).