Direct observations of organic aerosols in common wintertime hazes in   North China: insights into direct emissions from Chinese residential   stoves

doi:10.5194/acp-17-1259-2017

CORC > 北京大学 > 环境科学与工程学院

	Direct observations of organic aerosols in common wintertime hazes in North China: insights into direct emissions from Chinese residential stoves
	Chen, Shurui ; Xu, Liang ; Zhang, Yinxiao ; Chen, Bing ; Wang, Xinfeng ; Zhang, Xiaoye ; Zheng, Mei ; Chen, Jianmin ; Wang, Wenxing ; Sun, Yele ; Fu, Pingqing ; Wang, Zifa ; Li, Weijun
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2017
关键词	EAST-ASIAN OUTFLOW MASS-SPECTROMETRY BROWN CARBON ATMOSPHERIC PARTICLES COAL COMBUSTION MIXING STATE TAR BALLS BIOMASS PLAIN POLLUTION
DOI	10.5194/acp-17-1259-2017
英文摘要	Many studies have focused on the physicochemical properties of aerosol particles in unusually severe haze episodes in North China instead of the more frequent and less severe hazes. Consistent with this lack of attention, the morphology and mixing state of organic matter (OM) particles in the frequent light and moderate (L & M) hazes in winter in the North China Plain (NCP) have not been examined, even though OM dominates these fine particles. In the present work, morphology, mixing state, and size of organic aerosols in the L & M hazes were systematically characterized using transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy, atomic force microscopy, and nanoscale secondary ion mass spectrometer, with the comparisons among an urban site (Jinan, S1), a mountain site (Mt. Tai, S2), and a background island site (Changdao, S3) in the same hazes. Based on their morphologies, the OM particles were divided into six different types: spherical (type 1), near-spherical (type 2), irregular (type 3), domelike (type 4), dispersed-OM (type 5), and OM-coating (type 6). In the three sampling sites, types 1-3 of OM particles were most abundant in the L & M hazes and most of them were internally mixed with non-OM particles. The abundant near-spherical OM particles with higher sphericity and lower aspect ratio indicate that these primary OM particles formed in the cooling process after polluted plumes were emitted from coal combustion and biomass burning. Based on the Si-O-C ratio in OM particles, we estimated that 71% of type 1-3 OM particles were associated with coal combustion. Our result suggests that coal combustion in residential stoves was a widespread source from urban to rural areas in NCP. Average OM thickness which correlates with the age of the air masses in type 6 particles only slightly increased from S1 to S2 to S3, suggesting that the L & M hazes were usually dry (relative humidity < 60 %) with weak photochemistry and heterogeneous reactions between particles and gases. We conclude that the direct emissions from these coal stoves without any pollution controls in rural areas and in urban outskirts contribute large amounts of primary OM particles to the regional L & M hazes in North China.; National Natural Science Foundation of China [41575116, 41622504, 41571130033]; National Key Project of MOST [JFYS2016ZY01002213]; International Cooperation and Exchange project; Shandong Provincial Science Fund for Distinguished Young Scholars, China [JQ201413]; SCI(E); ARTICLE; 2; 1258-1270; 17
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475579]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Chen, Shurui,Xu, Liang,Zhang, Yinxiao,et al. Direct observations of organic aerosols in common wintertime hazes in North China: insights into direct emissions from Chinese residential stoves[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017.
APA	Chen, Shurui.,Xu, Liang.,Zhang, Yinxiao.,Chen, Bing.,Wang, Xinfeng.,...&Li, Weijun.(2017).Direct observations of organic aerosols in common wintertime hazes in North China: insights into direct emissions from Chinese residential stoves.ATMOSPHERIC CHEMISTRY AND PHYSICS.
MLA	Chen, Shurui,et al."Direct observations of organic aerosols in common wintertime hazes in North China: insights into direct emissions from Chinese residential stoves".ATMOSPHERIC CHEMISTRY AND PHYSICS (2017).