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	Size and elemental composition of dry-deposited particles during a severe dust storm at a coastal site of Eastern China
	Niu, Hongya ; Zhang, Daizhou ; Hu, Wei ; Shi, Jinhui ; Li, Ruipeng ; Gao, Huiwang ; Pian, Wei ; Hu, Min
	2016
关键词	Asian dust Dry deposition Morphology Size distribution Elemental composition EOLIAN DUST ECOSYSTEM DEVELOPMENT CHANGING SOURCES MINERAL DUST MARCH 2010 ASIA PACIFIC SOILS MODEL OCEAN
英文摘要	Dry-deposited particles were collected during the passage of an extremely strong dust storm in March, 2010 at a coastal site in Qingdao (36.15 degrees N, 120.49 degrees E), a city located in Eastern China. The size, morphology, and elemental composition of the particles were quantified with a scanning electron microscope equipped with an energy dispersive X-ray instrument (SEM-EDX). The particles appeared in various shapes, and their size mainly varied from 0.4 to 10 mu m, with the mean diameters of 0.5, 1.5, and 1.0 mu m before, during, and after the dust storm, respectively. The critical size of the mineral particles settling on the surface in the current case was about 0.3-0.4 mu m before the dust storm and about 0.5-0.7 mu m during the dust storm. Particles that appeared in high concentration but were smaller than the critical size deposited onto the surface at a small number flux. The elements Al, Si and Mg were frequently detected in all samples, indicating the dominance of mineral particles. The frequency of Al in particles collected before the dust storm was significantly lower than for those collected during and after the dust storm. The frequencies of Cl and Fe did not show obvious changes, while those of S, K and Ca decreased after the dust arrival. These results indicate that the dust particles deposited onto the surface were less influenced by anthropogenic pollutants in terms of particle number. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.; SCI(E); EI; CPCI-S(ISTP); PubMed; minhu@pku.edu.cn; 161-168; 40
语种	英语
出处	JOURNAL OF ENVIRONMENTAL SCIENCES
DOI标识	10.1016/j.jes.2015.09.016
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/434535]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Niu, Hongya,Zhang, Daizhou,Hu, Wei,et al. Size and elemental composition of dry-deposited particles during a severe dust storm at a coastal site of Eastern China. 2016-01-01.

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