干旱区生态环境知识资源中心(Arid): Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High-Frequency Variability

Arid

DOI	10.1029/2019JF005329
	Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High-Frequency Variability
	Tan, Lihai 1,2; An, Zhishan 1,2; Zhang, Kai 3; Qu, Jianjun1,2 ; Han, Qingjie 1,2; Wang, Junzhan 1,2
通讯作者	Tan, Lihai
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN	2169-9003
EISSN	2169-9011
出版年	2020
卷号	125 期号:1
英文摘要	Gobi is a type of desert pavement in Asia over which aeolian saltation generates atmospheric dust. However, the high-frequency behavior of aeolian saltation over gobi is still poorly understood. In this study, coupled high-frequency observations of three-dimensional (3-D) wind speed (U) and saltation particle count rate in a vertical array of Sensit sensors were performed in a gobi region of Milan County, southern Xinjiang, China. The results revealed that aeolian saltation over a gobi surface exhibited an intermittent phenomenon, and the level of the intermittency was governed by the relative wind strength (s), which is consistent with that of sand surfaces. The threshold wind speed (U-t) decreased exponentially with increasing transport activity parameter (AP), and a prominent decrease in U-t was examined when the AP values reached 0.7; comparatively, for sand surfaces, a linearly declining trend occurred over the whole AP range of 0-1. The saltating particles over the gobi surface were distributed in layers of 0.08-0.30 m with an average value of 0.20 +/- 0.04 m, which was significantly larger than that of sand surfaces. The relationship between the instantaneous sand transport rate (Q) and U over the gobi surface was also relatively poor and could be improved by lagging Q by 2 s. The mechanism for the collision between saltating particles and the gobi bed, which is rigid and complex in texture, was significantly different from that of the soft and deforming sand bed, causing the difference in aeolian saltation between gobi and sand surfaces.
英文关键词	gobi aeolian saltation intermittency saltation threshold saltation layer height high-frequency variability
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000519120200009
WOS关键词	MASS FLUX DISTRIBUTIONS ; SEDIMENT TRANSPORT ; SAND TRANSPORT ; DISTINCT THRESHOLDS ; FIELD-MEASUREMENTS ; MOGAO GROTTOES ; DESERT DUST ; WIND ; ENTRAINMENT ; INITIATION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314971
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China; 2.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Dunhuang Gobi Desert Res Stn, Dunhuang, Peoples R China; 3.Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Tan, Lihai,An, Zhishan,Zhang, Kai,et al. Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High-Frequency Variability[J],2020,125(1).
APA	Tan, Lihai,An, Zhishan,Zhang, Kai,Qu, Jianjun,Han, Qingjie,&Wang, Junzhan.(2020).Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High-Frequency Variability.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,125(1).
MLA	Tan, Lihai,et al."Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High-Frequency Variability".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 125.1(2020).