气候变化领域集成服务门户(CCPortal): Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet

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DOI	10.5194/tc-14-2103-2020
	Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet
	Ross N.; Corr H.; Siegert M.
发表日期	2020
ISSN	19940416
起始页码	2103
结束页码	2114
卷号	14 期号:6
英文摘要	It has been hypothesized that complex englacial structures identified within the East Antarctic and Greenland ice sheets are generated by (i) water freezing to the ice sheet base and evolving under ice flow, (ii) deformation of ice of varying rheology, or (iii) entrainment of basal material. Using ice-penetrating radar, we identify a widespread complex of deep-ice facies in West Antarctica that exist in the absence of basal water. These deep-ice units are extensive, thick (gt;500m), and incorporate multiple highly reflective englacial layers. At the lateral margin of an enhanced flow tributary of the Institute Ice Stream, these units are heavily deformed and folded by the action of lateral flow convergence. Radar reflectivity analysis demonstrates that the uppermost reflector of the deep-ice package is highly anisotropic, due to abrupt alternations in crystal orientation fabric, and consequently will have a different rheology to the ice above and below it. Deformation and folding of the deep-ice package is an englacial response to the combination of laterally-convergent ice flow and the physical properties of the ice column. © 2020 The Author(s).
英文关键词	deep sea; englacial process; ice sheet; stratigraphy; Antarctica
语种	英语
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/202196
作者单位	School of Geography, Politics and Sociology, Newcastle University, Newcastle upon Tyne, United Kingdom; British Antarctic Survey, High Cross, Cambridge, United Kingdom; Grantham Institute, Department of Earth Science and Engineering, Imperial College London, London, United Kingdom
推荐引用方式 GB/T 7714	Ross N.,Corr H.,Siegert M.. Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet[J],2020,14(6).
APA	Ross N.,Corr H.,&Siegert M..(2020).Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet.Cryosphere,14(6).
MLA	Ross N.,et al."Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet".Cryosphere 14.6(2020).