气候变化领域集成服务门户(CCPortal): The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture

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DOI	10.5194/tc-12-3361-2018
	The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture
	King E.C.; De Rydt J.; Hilmar Gudmundsson G.
发表日期	2018
ISSN	19940416
卷号	12 期号:10
英文摘要	The rate and direction of rift propagation through ice shelves depend on both the stress field and the heterogeneity (or otherwise) of the physical properties of the ice. The Brunt Ice Shelf in Antarctica has recently developed new rifts, which are being actively monitored as they lengthen and interact with the internal structure of the ice shelf. Here we present the results of a ground-penetrating radar survey of the Brunt Ice Shelf aimed at understanding variations in the internal structure. We find that there are flow bands composed mostly of thick (ca. 250 m) meteoric ice interspersed with thinner (ca. 150 m) sections of ice shelf that have a large proportion of sea ice and seawater-saturated firn. Therefore the ice shelf is, in essence, a series of ice tongues cemented together with ice mlange. The changes in structure are related both to the thickness and flow speed of ice at the grounding line and to subsequent processes of firn accumulation and brine infiltration as the ice shelf flows towards the calving front. It is shown that rifts propagating through the Brunt Ice Shelf preferentially skirt the edges of blocks of meteoric ice and slow their rate of propagation when forced by the stress field to break through them, in contrast to the situation on other ice shelves where rift propagation speeds up in meteoric ice. © 2018 Author(s).
学科领域	accumulation; firn; fracture; ground penetrating radar; grounding line; heterogeneity; ice shelf; infiltration; physical property; sea ice; stress field; Antarctica; Antarctica; Brunt Ice Shelf; East Antarctica
语种	英语
scopus关键词	accumulation; firn; fracture; ground penetrating radar; grounding line; heterogeneity; ice shelf; infiltration; physical property; sea ice; stress field; Antarctica; Antarctica; Brunt Ice Shelf; East Antarctica
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/119045
作者单位	Ice Dynamics and Palaeoclimate Team, British Antarctic Survey, Cambridge, CB30ET, United Kingdom; Department of Geography and Earth Science, Northumbria University, Newcastle, NE18ST, United Kingdom
推荐引用方式 GB/T 7714	King E.C.,De Rydt J.,Hilmar Gudmundsson G.. The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture[J],2018,12(10).
APA	King E.C.,De Rydt J.,&Hilmar Gudmundsson G..(2018).The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture.Cryosphere,12(10).
MLA	King E.C.,et al."The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture".Cryosphere 12.10(2018).