Chemical composition, sources, and aging process of submicron aerosols   in Beijing: Contrast between summer and winter

doi:10.1002/2015JD024020

CORC > 北京大学 > 环境科学与工程学院

	Chemical composition, sources, and aging process of submicron aerosols in Beijing: Contrast between summer and winter
	Hu, Weiwei ; Hu, Min ; Hu, Wei ; Jimenez, Jose L. ; Yuan, Bin ; Chen, Wentai ; Wang, Ming ; Wu, Yusheng ; Chen, Chen ; Wang, Zhibin ; Peng, Jianfei ; Zeng, Limin ; Shao, Min
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2016
关键词	PM1 concentration Beijing winter summer aerosol composition secondary primary OA source apportionment SECONDARY ORGANIC AEROSOL POLYCYCLIC AROMATIC-HYDROCARBONS POSITIVE MATRIX FACTORIZATION BIOMASS BURNING CONTRIBUTION URBAN SUPERSITE T0 HIGH-RESOLUTION MASS-SPECTROMETRY MEXICO-CITY SOURCE APPORTIONMENT COAL COMBUSTION
DOI	10.1002/2015JD024020
英文摘要	To investigate the seasonal characteristics of submicron aerosol (PM1) in Beijing urban areas, a high-resolution time-of-flight aerosol-mass-spectrometer (HR-ToF-AMS) was utilized at an urban site in summer (August to September 2011) and winter (November to December 2010), coupled with multiple state of the art online instruments. The average mass concentrations of PM1 (60-84 mu gm(-3)) and its chemical compositions in different campaigns of Beijing were relatively consistent in recent years. In summer, the daily variations of PM1 mass concentrations were stable and repeatable. Eighty-two percent of the PM1 mass concentration on average was composed of secondary species, where 62% is secondary inorganic aerosol and 20% secondary organic aerosol (SOA). In winter, PM1 mass concentrations changed dramatically because of the different meteorological conditions. The high average fraction (58%) of primary species in PM1 including primary organic aerosol (POA), black carbon, and chloride indicates primary emissions usually played a more important role in the winter. However, aqueous chemistry resulting in efficient secondary formation during occasional periods with high relative humidity may also contribute substantially to haze in winter. Results of past OA source apportionment studies in Beijing show 45-67% of OA in summer and 22-50% of OA in winter can be composed of SOA. Based on the source apportionment results, we found 45% POA in winter and 61% POA in summer are from nonfossil sources, contributed by cooking OA in both seasons and biomass burning OA (BBOA) in winter. Cooking OA, accounting for 13-24% of OA, is an important nonfossil carbon source in all years of Beijing and should not be neglected. The fossil sources of POA include hydrocarbon-like OA from vehicle emissions in both seasons and coal combustion OA (CCOA) in winter. The CCOA and BBOA were the two main contributors (57% of OA) for the highest OA concentrations (>100 mu gm(-3)) in winter. The POA/CO ratios in winter and summer are 11 and 16 mu gm(-3)ppm(-1), respectively, similar to ratios from western cities. Higher OOA/O-x (=NO2+O-3) ratio (0.49 mu gm(-3)ppb(-1)) in winter study than these ratios from western cities (0.03-0.16 mu gm(-3)ppb(-1)) was observed, which may be due to the aqueous reaction or extra SOA formation contributed by semivolatile organic compounds from various primary sources (e.g., BBOA or CCOA) in Beijing. The evolution of oxygen to carbon ratio (O/C) with photochemical age allows to estimate an equivalent rate constant for chemical aging of OA in summer as k(OH)similar to 4.1x10(-12)cm(3)molecule(-1)s(-1), which is of the same order as obtained in other anthropogenic influenced areas and may be useful for OA modeling.; Chinese Academy of Sciences [XDB05010500]; China Ministry of Science and Technology [2013CB228503]; National Natural Science Foundation of China [21190052, 91544214]; China Ministry of Environmental Protection's Special Funds for Scientific Research on Public Welfare [20130916]; NSF [AGS-1360834]; SCI(E); ARTICLE; minhu@pku.edu.cn; 4; 1955-1977; 121
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438588]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Hu, Weiwei,Hu, Min,Hu, Wei,et al. Chemical composition, sources, and aging process of submicron aerosols in Beijing: Contrast between summer and winter[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2016.
APA	Hu, Weiwei.,Hu, Min.,Hu, Wei.,Jimenez, Jose L..,Yuan, Bin.,...&Shao, Min.(2016).Chemical composition, sources, and aging process of submicron aerosols in Beijing: Contrast between summer and winter.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES.
MLA	Hu, Weiwei,et al."Chemical composition, sources, and aging process of submicron aerosols in Beijing: Contrast between summer and winter".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2016).