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DOI	10.5194/acp-20-8737-2020
	Measurements of traffic-dominated pollutant emissions in a Chinese megacity
	Squires F.A.; Nemitz E.; Langford B.; Wild O.; Drysdale W.S.; Joe F. Acton W.; Fu P.; Sue B. Grimmond C.; Hamilton J.F.; Nicholas Hewitt C.; Hollaway M.; Kotthaus S.; Lee J.; Metzger S.; Pingintha-Durden N.; Shaw M.; Vaughan A.R.; Wang X.; Wu R.; Zhang Q.; Zhang Y.
发表日期	2020
ISSN	1680-7316
起始页码	8737
结束页码	8761
卷号	20 期号:14
英文摘要	Direct measurements of NOx, CO and aromatic volatile organic compound (VOC) (benzene, toluene, C2-benzenes and C3-benzenes) flux were made for a central area of Beijing using the eddy-covariance technique. Measurements were made during two intensive field campaigns in central Beijing as part of the Air Pollution and Human Health (APHH) project, the first in November-December 2016 and the second during May-June 2017, to contrast wintertime and summertime emission rates. There was little difference in the magnitude of NOx flux between the two seasons (mean NOx flux was 4.41 mg m-2 h-1 in the winter compared to 3.55 mg m-2 h-1 in the summer). CO showed greater seasonal variation, with mean CO flux in the winter campaign (34.7 mg m-2 h-1) being over twice that of the summer campaign (15.2 mg m-2 h-1). Larger emissions of aromatic VOCs in summer were attributed to increased evaporation due to higher temperatures. The largest fluxes in NOx and CO generally occurred during the morning and evening rush hour periods, indicating a major traffic source with high midday emissions of CO, indicating an additional influence from cooking fuel. Measured NOx and CO fluxes were then compared to the MEIC 2013 emissions inventory, which was found to significantly overestimate emissions for this region, providing evidence that proxy-based emissions inventories have positive biases in urban centres. This first set of pollutant fluxes measured in Beijing provides an important benchmark of emissions from the city which can help to inform and evaluate current emissions inventories. © 2020 Author(s).
语种	英语
scopus关键词	atmospheric pollution; emission inventory; evaporation; high temperature; megacity; pollutant source; seasonal variation; traffic emission; volatile organic compound; Beijing [China]; China
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/247629
作者单位	Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, United Kingdom; Centre for Ecology and Hydrology, Edinburgh, EH26 0QB, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; National Centre for Atmospheric Science, University of York, York, United Kingdom; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, China; Department of Meteorology, University of Reading, Reading, United Kingdom; National Ecological Observatory Network Program, 1685 38th Street, Boulder, CO 80301, United States; University of Wisconsin-Madison, Department of Atmospheric and Oceanic Sciences, 1225 West Dayton Street, Madison, WI 53706, United States; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Ministry of Education Key Laboratory for Earth System Modelling, Department of Earth Syst...
推荐引用方式 GB/T 7714	Squires F.A.,Nemitz E.,Langford B.,et al. Measurements of traffic-dominated pollutant emissions in a Chinese megacity[J],2020,20(14).
APA	Squires F.A..,Nemitz E..,Langford B..,Wild O..,Drysdale W.S..,...&Zhang Y..(2020).Measurements of traffic-dominated pollutant emissions in a Chinese megacity.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(14).
MLA	Squires F.A.,et al."Measurements of traffic-dominated pollutant emissions in a Chinese megacity".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.14(2020).