气候变化领域集成服务门户(CCPortal): Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica

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DOI	10.5194/tc-13-1959-2019
	Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica
	Kirkham J.D.; Hogan K.A.; Larter R.D.; Arnold N.S.; Nitsche F.O.; Golledge N.R.; Dowdeswell J.A.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1959
结束页码	1981
卷号	13 期号:7
英文摘要	Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice-flow velocities over periods of months to years. Although subglacial lake drainage events have been observed from satellite-altimetric data, little is known about their role in the long-term evolution of ice-sheet basal hydrology. Here, we systematically map and model past water flow through an extensive area containing over 1000 subglacial channels and 19 former lake basins exposed on over 19 000 km2 of seafloor by the retreat of Pine Island and Thwaites glaciers, West Antarctica. At 507 m wide and 43 m deep on average, the channels offshore of presentday Pine Island and Thwaites glaciers are approximately twice as deep, 3 times as wide, and cover an area over 400 times larger than the terrestrial meltwater channels comprising the Labyrinth in the Antarctic Dry Valleys. The channels incised into bedrock offshore of contemporary Pine Island and Thwaites glaciers would have been capable of accommodating discharges of up to 8:8 × 106 m3 s-1. We suggest that the channels were formed by episodic discharges from subglacial lakes trapped during ice-sheet advance and retreat over multiple glacial periods. Our results document the widespread influence of episodic subglacial drainage events during past glacial periods, in particular beneath large ice streams similar to those that continue to dominate contemporary ice-sheet discharge. © 2019 Author(s).
学科领域	basal flow; bedrock; channel flow; discharge; drainage; flood; flow velocity; glacier advance; glacier retreat; ice flow; ice sheet; long-term change; meltwater; offshore application; outburst; seafloor; subglacial environment; water flow; Antarctic Ice Sheet; Antarctica; East Antarctica; Florida [United States]; McMurdo Dry Valleys; Pine Island; Thwaites Glacier; United States; West Antarctica
语种	英语
scopus关键词	basal flow; bedrock; channel flow; discharge; drainage; flood; flow velocity; glacier advance; glacier retreat; ice flow; ice sheet; long-term change; meltwater; offshore application; outburst; seafloor; subglacial environment; water flow; Antarctic Ice Sheet; Antarctica; East Antarctica; Florida [United States]; McMurdo Dry Valleys; Pine Island; Thwaites Glacier; United States; West Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118857
作者单位	Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge, CB2-1ER, United Kingdom; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3-0ET, United Kingdom; Lamont-Doherty Earth Observatory of Columbia University, P.O. Box 1000, Palisades, NY 10964-8000, United States; Antarctic Research Centre, Victoria University of Wellington, Wellington, 6140, New Zealand
推荐引用方式 GB/T 7714	Kirkham J.D.,Hogan K.A.,Larter R.D.,et al. Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica[J],2019,13(7).
APA	Kirkham J.D..,Hogan K.A..,Larter R.D..,Arnold N.S..,Nitsche F.O..,...&Dowdeswell J.A..(2019).Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica.The Cryosphere,13(7).
MLA	Kirkham J.D.,et al."Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica".The Cryosphere 13.7(2019).