气候变化领域集成服务门户(CCPortal): Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing

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DOI	10.5194/acp-21-5301-2021
	Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing
	Wang W.; Shao L.; Mazzoleni C.; Li Y.; Kotthaus S.; Grimmond S.; Bhandari J.; Xing J.; Feng X.; Zhang M.; Shi Z.
发表日期	2021
ISSN	1680-7316
起始页码	5301
结束页码	5314
卷号	21 期号:7
英文摘要	Beijing has been suffering from frequent severe air pollution events, with concentrations affected significantly by the mixed-layer height. Major efforts have been made to study the physico-chemical properties, compositions, and sources of aerosol particles at ground level. However, little is known about the morphology, elemental composition, and mixing state of aerosol particles above the mixed layer. In this work, we collected individual aerosol particles simultaneously at ground level (2 m above ground) and above the mixed layer in urban Beijing (within the Atmospheric Pollution and Human Health in a Chinese Megacity, APHH-Beijing, 2016 winter campaign). The particles were analyzed offline by transmission electron microscopy coupled with energy dispersive X-ray spectroscopy. Our results showed that the relative number contribution of mineral particles to all measured particles was much higher during non-haze periods (42.5 %) than haze periods (18.1 %); in contrast, internally mixed particles contributed more during haze periods (21.9 %) than non-haze periods (7.2 %) at ground level. In addition, more mineral particles were found at ground level than above the mixed-layer height. Around 20 % of individual particles showed core-shell structures during haze periods, whereas only a few core-shell particles were observed during non-haze periods (2 %). The results showed that the particles above the mixed layer were more aged, with a larger proportion of organic particles originating from coal combustion. Our results indicate that a large fraction of the airborne particles above the mixed layer come from surrounding areas influenced by coal combustion activities. This source contributes to the surface particle concentrations in Beijing when polluted air is mixed down to the ground level. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; atmospheric pollution; coal combustion; mixed layer; transmission electron microscopy; urban area; winter; X-ray spectroscopy; 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/246994
作者单位	State Key Lab. of Coal Rsrc. and Safe Mining and College of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, China; School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China; Atmospheric Sciences Program and Physics Department, Michigan Technological University, Houghton, MI 49931, United States; Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; School of Forestry, Jiangxi Agricultural University, Nanchang, 330045, China; School of Geography Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, United Kingdom
推荐引用方式 GB/T 7714	Wang W.,Shao L.,Mazzoleni C.,et al. Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing[J],2021,21(7).
APA	Wang W..,Shao L..,Mazzoleni C..,Li Y..,Kotthaus S..,...&Shi Z..(2021).Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(7).
MLA	Wang W.,et al."Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.7(2021).