The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 大气环境科学实验室

	The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China
	Zhang, Hongxing; Liu, Pengfei; Zhang, Yuanyuan; Zhang, Chenglong; Liu, Junfeng; Mu, Yujing; Ma, Zhuobiao; Liu, Chengtang
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2017-09-11
卷号	17 期号:17 页码:10633-10649
关键词	Gasoline Vehicle Exhaust Secondary Organic Aerosols Haze Oh/no3/o-3 Derivatization
英文摘要	Atmospheric non-methane hydrocarbon compounds (NMHCs) were measured at a sampling site in Beijing city from 15 December 2015 to 14 January 2016 to recognize their pollution levels, variation characteristics, and sources. We quantified 53 NMHCs, and the proportions of alkanes, alkenes, acetylene, and aromatics to the total NMHCs were 49.8-55.8, 21.5-24.7, 13.5-15.9, and 9.3-10.7 %, respectively. The variation trends in the NMHC concentrations were basically identical and exhibited remarkable fluctuation, which was mainly ascribed to the variation in meteorological conditions, especially wind speed. The diurnal variations in NMHCs on clear days exhibited two peaks during the morning and evening rush hours, whereas the rush hours' peaks diminished or even disappeared on the haze days, implying that the relative contribution of the vehicular emissions to atmospheric NMHCs depended on the pollution status. Two evident peaks of the propane / propene ratios appeared in the early morning before sun rise and at noontime on clear days, whereas only one peak occurred in the afternoon during the haze days, which were attributed to the relatively fast reactions of propene with OH, NO3, and O-3. Based on the chemical kinetic equations, the daytime OH concentrations were calculated to be in the range of 3.47 x 10(5)-1.04 x 10(6) molecules cm(-3) on clear days and 6.42 x 10(5)-2.35 x 10(6) molecules cm(-3) on haze days. The nighttime NO3 concentrations were calculated to be in the range of 2.82 x 10(9)-4.86 x 10(9) molecules cm(-3) on clear days. The correlation coefficients of typical hydrocarbon pairs (benzene/toluene, o-xylene/m, p-xylene, isopentane/n-pentane, etc.) revealed that vehicular emissions and coal combustion were important sources for atmospheric NMHCs in Beijing during the wintertime. Five major emission sources for atmospheric NMHCs in Beijing during the wintertime were further identified by positive matrix factorization (PMF), including gasoline- related emissions (gasoline exhaust and evaporation), coal combustion, diesel exhaust, acetylene- related emissions, and consumer and household products. Coal combustion (probably domestic coal combustion) was found to make the greatest contribution (29.6-33.4 %) to atmospheric NMHCs during haze days.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39183]
专题	生态环境研究中心_大气环境科学实验室
推荐引用方式 GB/T 7714	Zhang, Hongxing,Liu, Pengfei,Zhang, Yuanyuan,et al. The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(17):10633-10649.
APA	Zhang, Hongxing.,Liu, Pengfei.,Zhang, Yuanyuan.,Zhang, Chenglong.,Liu, Junfeng.,...&Liu, Chengtang.(2017).The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(17),10633-10649.
MLA	Zhang, Hongxing,et al."The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.17(2017):10633-10649.