干旱区生态环境知识资源中心(Arid): Sand Dune Albedo Feedback

Arid

DOI	10.3390/geosciences8030082
	Sand Dune Albedo Feedback
	Ashkenazy, Yosef; Shilo, Elad
通讯作者	Ashkenazy, Y
来源期刊	GEOSCIENCES
EISSN	2076-3263
出版年	2018
卷号	8 期号:3
英文摘要	Sand dunes cover substantial parts of desert areas. Fully active dunes are bare, while fixed dunes are stabilized by vegetation and biogenic crust, and the dune activity is affected by the wind. Here we suggest the following atmosphere-sand dune feedback: spatial differences in the dunes' vegetation and biogenic crust cover lead to differences in albedo as the albedo of bare sand is larger than that of vegetation and biogenic crust. This leads to a higher temperature over the vegetated area, resulting in air flow from the bare dune area to the vegetated dune area, thus increasing the wind activity over the vegetated dune area. In turn, this leads to enhanced stress on the vegetation and enhanced dune activity and thus to a decrease in vegetation. These changes in vegetation cover affect the surface albedo, leading to a change in wind activity. We examined this feedback using an atmospheric general circulation model, Weather Research and Forecasting (WRF), in selected regions of the northwestern Negev Desert and the Sahara/Sahel region, and we show that changes in surface albedo do indeed lead to significantly enhanced wind activity over the lower albedo region. We then incorporated this feedback into a simple vegetated dune model, showing that the multiple states associated with active and fixed dunes can be obtained for a larger range of parameters and that the stables states become more extreme (i.e., the fixed dune state becomes more vegetated and the active dune state becomes less vegetated).
英文关键词	sand dunes albedo atmospheric dynamics feedback WRF
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000428667800004
WOS关键词	SEA-ICE ; CLIMATE-CHANGE ; VEGETATION ; DESERTIFICATION ; DYNAMICS ; DROUGHT ; AFRICAN ; SYSTEMS ; SURFACE ; IMPACT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/332737
作者单位	[Ashkenazy, Yosef; Shilo, Elad] Ben Gurion Univ Negev, Blaustein Inst Desert Res, Dept Solar Energy & Environm Phys, Sede Boqer Campus, IL-84990 Beer Sheva, Israel
推荐引用方式 GB/T 7714	Ashkenazy, Yosef,Shilo, Elad. Sand Dune Albedo Feedback[J]. Ben-Gurion University of the Negev,2018,8(3).
APA	Ashkenazy, Yosef,&Shilo, Elad.(2018).Sand Dune Albedo Feedback.GEOSCIENCES,8(3).
MLA	Ashkenazy, Yosef,et al."Sand Dune Albedo Feedback".GEOSCIENCES 8.3(2018).