干旱区生态环境知识资源中心(Arid): Can active sands generate dust particles by wind-induced processes?

Arid

DOI	10.1016/j.epsl.2018.11.013
	Can active sands generate dust particles by wind-induced processes?
	Swet, Nitzan 1; Elperin, Tov 2; Kok, Jasper F.3; Martin, Raleigh L.3; Yizhaq, Hezi 4; Katra, Itzhak 1
通讯作者	Swet, Nitzan
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
EISSN	1385-013X
出版年	2019
卷号	506 页码:371-380
英文摘要	Mineral dust emission is a major process in determining the global dust cycle. At a global scale there is still uncertainty about the absolute and relative contribution of dust from different source areas and landforms. Dust sources are mainly considered as surfaces containing relatively high percentages of fine particles (e.g. Playas). Yet, active (dune) sands have been identified recently, by remote sensing studies, as dust sources in northern Africa, China, and elsewhere. Previous studies on dust emission from active sands suggested that dust can be generated by different aeolian mechanisms that are related to (i) re-emission of settled dust particles, (ii) clay coating removal, and (iii) abrasion of the sand grains. However, there is only limited information of the relative importance of the different mechanisms for producing this dust under natural aeolian (wind) conditions. This study integrates wind tunnel experiments and high resolution laboratory sand analyses to explore aeolian dust emission from active sands with conditions simulating the natural processes of saltation and explores the role of the different dust emission mechanisms. Sand samples from three sites with different characteristics of grain size, dust content, morphology, and mineralogy were used in the experiments. No dust emission was recorded for shear velocities below the saltation threshold. The initial content of dust-sized particles (>63 mu m) in the sand sample was found to influence PM10 emission. PM10 concentrations were increased with the initial content of dust-sized particles in the sand. The experiments identify clay coatings removal as the dominant mechanism over time of dust emission in typical active sand dunes (<2% dust content) with an addition of re-emission of existing dust-sized particles (<63 mu m). The results also suggest that aeolian abrasion play only a minor role in PM10 dust generation from active sands, producing mostly relatively course dust-sized particles (>40 mu m). The dust emission observed in this study indicates that, in addition to the classic dust sources of non-sandy soils, sand bodies should also be taken into consideration in determining global dust emission. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	aeolian processes dust sources PM10 wind tunnel saltation
类型	Article
语种	英语
国家	Israel ; USA
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000455693800035
WOS关键词	SIZED QUARTZ SILT ; DESERT DUST ; AEOLIAN SALTATION ; EMISSION MODEL ; EOLIAN SAND ; LOESS ; TRANSPORT ; DUNES ; BIOGEOCHEMISTRY ; ABRASION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
来源机构	Ben-Gurion University of the Negev ; University of California, Los Angeles
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215069
作者单位	1.Ben Gurion Univ Negev, Dept Geog & Environm Dev, Beer Sheva, Israel; 2.Ben Gurion Univ Negev, Dept Mech Engn, Pearlstone Ctr Aeronaut Engn Studies, Beer Sheva, Israel; 3.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA; 4.Ben Gurion Univ Negev, BIDR, Dept Solar Energy & Environm Phys, Beer Sheva, Israel
推荐引用方式 GB/T 7714	Swet, Nitzan,Elperin, Tov,Kok, Jasper F.,et al. Can active sands generate dust particles by wind-induced processes?[J]. Ben-Gurion University of the Negev, University of California, Los Angeles,2019,506:371-380.
APA	Swet, Nitzan,Elperin, Tov,Kok, Jasper F.,Martin, Raleigh L.,Yizhaq, Hezi,&Katra, Itzhak.(2019).Can active sands generate dust particles by wind-induced processes?.EARTH AND PLANETARY SCIENCE LETTERS,506,371-380.
MLA	Swet, Nitzan,et al."Can active sands generate dust particles by wind-induced processes?".EARTH AND PLANETARY SCIENCE LETTERS 506(2019):371-380.