干旱区生态环境知识资源中心(Arid): Periglacial slopewash dominated by solute transfers and subsurface erosion on a High Arctic slope

Arid

DOI	10.1002/ppp.2066
	Periglacial slopewash dominated by solute transfers and subsurface erosion on a High Arctic slope
	Paquette, Michel 1,4; Fortier, Daniel 2,4; Lafreniere, Melissa 1; Vincent, Warwick F.3,4
通讯作者	Paquette, Michel
来源期刊	PERMAFROST AND PERIGLACIAL PROCESSES
ISSN	1045-6740
EISSN	1099-1530
出版年	2020
卷号	31 期号:4 页码:472-486
英文摘要	Arctic slope hydrology studies suggest that water follows preferential subsurface flow paths known as water tracks. While subsurface flow is usually expected to transport only dissolved solids, periglacial studies have indicated some evidence of lessivage associated with flow through sorted patterned ground. We investigated the transport of dissolved and suspended sediments in water tracks on a polar desert slope, and linked this transport to slope and flow path geomorphology. Solute transfer was dominated by carbonate weathering products, and concentrations of other ions increased disproportionately when the active layer thawed. Suspended sediment transport occurred in water tracks, but fluxes were supply-limited, indicating competent subsurface mechanical erosion. Solute mass fluxes were 5-10 times greater than sediment fluxes. In this dry landscape dominated by snowmelt, surface seepage leads to sediment deposition, while subsurface flow promotes lessivage. A conceptual model of nivation slopes is presented, taking into consideration the influence of flow path morphology and adaptation of the hydrological system to localized water sources from wind-drifted snowbanks. Climate-driven permafrost degradation and the increased frequency of rainfall events may result in new sediment sources and changes in flow pathways, modifying the physico-chemical properties and ecology of downstream receiving waters.
英文关键词	Arctic climate change periglacial geomorphology permafrost hydrology polar desert slope hydrology water tracks
类型	Article
语种	英语
国家	Canada
收录类别	SCI-E
WOS记录号	WOS:000532916100001
WOS关键词	NORTHERN ELLESMERE-ISLAND ; MCMURDO DRY VALLEYS ; WARD HUNT ISLAND ; POLAR DESERT ; PREFERENTIAL FLOW ; DEVON ISLAND ; WATER TRACKS ; ICE SHELF ; PERMAFROST ; LAKE
WOS类目	Geography, Physical ; Geology
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318655
作者单位	1.Queens Univ, Dept Geog & Planning, Kingston, ON, Canada; 2.Univ Montreal, Dept Geog, Montreal, PQ, Canada; 3.Laval Univ, Dept Biol, Quebec City, PQ, Canada; 4.Laval Univ, Ctr Northern Studies CEN, Quebec City, PQ, Canada
推荐引用方式 GB/T 7714	Paquette, Michel,Fortier, Daniel,Lafreniere, Melissa,et al. Periglacial slopewash dominated by solute transfers and subsurface erosion on a High Arctic slope[J],2020,31(4):472-486.
APA	Paquette, Michel,Fortier, Daniel,Lafreniere, Melissa,&Vincent, Warwick F..(2020).Periglacial slopewash dominated by solute transfers and subsurface erosion on a High Arctic slope.PERMAFROST AND PERIGLACIAL PROCESSES,31(4),472-486.
MLA	Paquette, Michel,et al."Periglacial slopewash dominated by solute transfers and subsurface erosion on a High Arctic slope".PERMAFROST AND PERIGLACIAL PROCESSES 31.4(2020):472-486.