气候变化领域集成服务门户(CCPortal): Ambient nitro-aromatic compounds-biomass burning versus secondary formation in rural China

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DOI	10.5194/acp-21-1389-2021
	Ambient nitro-aromatic compounds-biomass burning versus secondary formation in rural China
	Salvador C.M.G.; Tang R.; Priestley M.; Li L.; Tsiligiannis E.; Le Breton M.; Zhu W.; Zeng L.; Wang H.; Yu Y.; Hu M.; Guo S.; Hallquist M.
发表日期	2021
ISSN	1680-7316
起始页码	1389
结束页码	1406
卷号	21 期号:3
英文摘要	Nitro-aromatic compounds (NACs) were measured hourly at a rural site in China during wintertime to monitor the changes due to local and regional impacts of biomass burning (BB). Concurrent and continuous measurements of the concentrations of 16 NACs in the gas and particle phases were performed with a time-of-flight chemical ionization mass spectrometer (CIMS) equipped with a Filter Inlet for Gases and AEROsols (FIGAERO) unit using iodide as the reagent ion. NACs accounted for <2% of the mass concentration of organic matter (OM) and total particulate matter (PM), but the total particle mass concentrations of these compounds can reach as high as 1000 ngm-3 (299 ngm-3 avg), suggesting that they may contribute significantly to the radiative forcing effects of atmospheric particles. Levels of gas-phase NACs were highest during the daytime (15:00-16:00 local time, LT), with a smaller nighttime peak around 20:00 LT. Box-model simulations showed that this occurred because the rate of NAC production from gas-phase sources exceeded the rate of loss, which occurred mainly via the OH reaction and to a lesser degree via photolysis. Data gathered during extended periods with high contributions from primary BB sources (resulting in 40 %-60% increases in NAC concentrations) were used to characterize individual NACs with respect to gas-particle partitioning and the contributions of regional secondary processes (i.e. photochemical smog). On days without extensive BB, secondary formation was the dominant source of NACs, and NAC levels correlated strongly with the ambient ozone concentration. Analyses of individual NACs in the regionally aged plumes sampled on these days allowed precursors such as phenol and catechol to be linked to their NAC derivatives (i.e. nitrophenol and nitrocatechol). Correlation analysis using the high time resolution data and box-model simulation results constrained the relationships between these compounds and demonstrated the contribution of secondary formation processes. Furthermore, 13 of 16 NACS were classified according to primary or secondary formation process. Primary emission was the dominant source (accounting for 60 %- 70% of the measured concentrations) of 5 of the 16 studied NACs, but secondary formation was also a significant source. Photochemical smog thus has important effects on brown carbon levels even during wintertime periods dominated by primary air pollution in rural China. © Author(s) 2021.
语种	英语
scopus关键词	air quality; ambient air; atmospheric plume; atmospheric pollution; biomass burning; concentration (composition); ionization; mass spectrometry; numerical model; spatial resolution; China; Varanidae
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/247185
作者单位	Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden; College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Shanghai Academy of Environmental Sciences, Shanghai, 200233, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Salvador C.M.G.,Tang R.,Priestley M.,et al. Ambient nitro-aromatic compounds-biomass burning versus secondary formation in rural China[J],2021,21(3).
APA	Salvador C.M.G..,Tang R..,Priestley M..,Li L..,Tsiligiannis E..,...&Hallquist M..(2021).Ambient nitro-aromatic compounds-biomass burning versus secondary formation in rural China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(3).
MLA	Salvador C.M.G.,et al."Ambient nitro-aromatic compounds-biomass burning versus secondary formation in rural China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.3(2021).