气候变化领域集成服务门户(CCPortal): Antarctic basal environment shaped by high-pressure flow through a subglacial river system

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DOI	10.1038/s41561-022-01059-1
	Antarctic basal environment shaped by high-pressure flow through a subglacial river system
	Dow, C. F.; Ross, N.; Jeofry, H.; Siu, K.; Siegert, M. J.
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	892
结束页码	+
卷号	15 期号:11 页码:16
英文摘要	The stability of ice sheets and their contributions to sea level are modulated by high-pressure water that lubricates the base ofthe ice, facilitating rapid flow into the ocean. In Antarctica, subglacial processes are poorly characterized, limiting understanding of ice-sheet flow and its sensitivity to climate forcing. Here, using numerical modelling and geophysical data, we provide evidence of extensive, up to 460 km long, dendritically organized subglacial hydrological systems that stretch from the ice-sheet interior to the grounded margin. We show that these channels transport large fluxes (similar to 24 m(3) s(-1)) of freshwater at high pressure, potentially facilitating enhanced ice flow above. The water exits the ice sheet at specific locations, appearing to drive ice-shelf melting in these areas critical for ice-sheet stability. Changes in subglacial channel size can affect the water depth and pressure ofthe surrounding drainage system up to 100 km either side of the primary channel. Our results demonstrate the importance of incorporating catchment-scale basal hydrology in calculations of ice-sheet flow and in assessments of ice-shelf melt at grounding zones. Thus, understanding how marginal regions of Antarctica operate, and may change in the future, requires knowledge of processes acting within, and initiating from, the ice-sheet interior.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000874422500002
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272632
作者单位	University of Waterloo; University of Waterloo; Newcastle University - UK; Universiti Malaysia Terengganu; Universiti Malaysia Terengganu; Imperial College London; Imperial College London
推荐引用方式 GB/T 7714	Dow, C. F.,Ross, N.,Jeofry, H.,et al. Antarctic basal environment shaped by high-pressure flow through a subglacial river system[J],2022,15(11):16.
APA	Dow, C. F.,Ross, N.,Jeofry, H.,Siu, K.,&Siegert, M. J..(2022).Antarctic basal environment shaped by high-pressure flow through a subglacial river system.NATURE GEOSCIENCE,15(11),16.
MLA	Dow, C. F.,et al."Antarctic basal environment shaped by high-pressure flow through a subglacial river system".NATURE GEOSCIENCE 15.11(2022):16.