气候变化领域集成服务门户(CCPortal): Channelized, distributed, and disconnected: Subglacial drainage under a valley glacier in the Yukon

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DOI	10.5194/tc-12-2609-2018
	Channelized, distributed, and disconnected: Subglacial drainage under a valley glacier in the Yukon
	Rada C.; Schoof C.
发表日期	2018
ISSN	19940416
卷号	12 期号:8
英文摘要	The subglacial drainage system is one of the main controls on basal sliding, but remains only partially understood. Here we use an 8-year dataset of borehole observations on a small, alpine polythermal valley glacier in the Yukon Territory to assess qualitatively how well the established understanding of drainage physics explains the observed temporal evolution and spatial configuration of the drainage system. We find that the standard picture of a channelizing drainage system that evolves towards higher effective pressure explains many features of the dataset. However, our dataset underlines the importance of hydraulic isolation of parts of the bed. We observe how disconnected portions of the bed systematically grow towards the end of the summer season, causing the drainage system to fragment into progressively more distinct subsystems. We conclude with an adaptation of existing drainage models that aims to capture the ability of parts of the bed to become hydraulically disconnected due to basal cavities of finite size becoming disconnected from each other as they shrink. © Author(s) 2018.
学科领域	borehole geophysics; data set; drainage; drainage network; sliding; subglacial environment; temporal evolution; valley glacier; Canada; Yukon Territory
语种	英语
scopus关键词	borehole geophysics; data set; drainage; drainage network; sliding; subglacial environment; temporal evolution; valley glacier; Canada; Yukon Territory
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119087
作者单位	Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2207 Main Mall, Vancouver, BC, Canada
推荐引用方式 GB/T 7714	Rada C.,Schoof C.. Channelized, distributed, and disconnected: Subglacial drainage under a valley glacier in the Yukon[J],2018,12(8).
APA	Rada C.,&Schoof C..(2018).Channelized, distributed, and disconnected: Subglacial drainage under a valley glacier in the Yukon.Cryosphere,12(8).
MLA	Rada C.,et al."Channelized, distributed, and disconnected: Subglacial drainage under a valley glacier in the Yukon".Cryosphere 12.8(2018).