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DOI	10.5194/acp-20-12939-2020
	Dependency of particle size distribution at dust emission on friction velocity and atmospheric boundary-layer stability
	Shao Y.; Zhang J.; Ishizuka M.; Mikami M.; Leys J.; Huang N.
发表日期	2020
ISSN	1680-7316
起始页码	12939
结束页码	12953
卷号	20 期号:21
英文摘要	Particle size distribution of dust at emission (dust PSD) is an essential quantity to estimate in dust studies. It has been recognized in earlier research that dust PSD is dependent on soil properties (e.g. whether soil is sand or clay) and friction velocity, u, which is a surrogate for surface shear stress and a descriptor for saltation-bombardment intensity. This recognition has been challenged in some recent papers, causing a debate on whether dust PSD is "invariant"and the search for its justification. In this paper, we analyse the dust PSD measured in the Japan Australian Dust Experiment and show that dust PSD is dependent on u and on atmospheric boundary-layer (ABL) stability. By simple theoretical and numerical analysis, we explain the two reasons for the latter dependency, which are both related to enhanced saltation bombardment in convective turbulent flows. First, u* is stochastic and its probability distribution profoundly influences the magnitude of the mean saltation flux due to the non-linear relationship between saltation flux and u. Second, in unstable conditions, turbulence is usually stronger, which leads to higher saltation-bombardment intensity. This study confirms that dust PSD depends on u and, more precisely, on the probability distribution of u, which in turn is dependent on ABL stability; consequently, dust PSD is also dependent on ABL. We also show that the dependency of dust PSD on u and ABL stability is made complicated by soil surface conditions. In general, our analysis reinforces the basic conceptual understanding that dust PSD depends on saltation bombardment and inter-particle cohesion. © Author(s) 2020.
语种	英语
scopus关键词	aerosol; atmospheric chemistry; boundary layer; concentration (composition); dust; emission control; friction; particle size; size distribution
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/247412
作者单位	Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany; Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou, China; Faculty of Engineering and Design, Kagawa University, Takamatsu, Japan; Office of Climate and Environmental Research Promotion, Japan Meteorological Business Support Center, Tokyo, Japan; Department of Planning, Industry and Environment, Lidcombe, NSW, Australia; Fenner School of Environment and Society, Australian National University, Canberra, Australia
推荐引用方式 GB/T 7714	Shao Y.,Zhang J.,Ishizuka M.,et al. Dependency of particle size distribution at dust emission on friction velocity and atmospheric boundary-layer stability[J],2020,20(21).
APA	Shao Y.,Zhang J.,Ishizuka M.,Mikami M.,Leys J.,&Huang N..(2020).Dependency of particle size distribution at dust emission on friction velocity and atmospheric boundary-layer stability.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21).
MLA	Shao Y.,et al."Dependency of particle size distribution at dust emission on friction velocity and atmospheric boundary-layer stability".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020).