气候变化领域集成服务门户(CCPortal): Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition

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DOI	10.5194/tc-14-2303-2020
	Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition
	Newton A.M.W.; Huuse M.; Knutz P.C.; Cox D.R.
发表日期	2020
ISSN	19940416
起始页码	2303
结束页码	2312
卷号	14 期号:7
英文摘要	Ice streams provide a fundamental control on ice sheet discharge and depositional patterns along glaciated margins. This paper investigates ancient ice streams by presenting the first 3D seismic geomorphological analysis of a major glacigenic succession offshore Greenland. In Melville Bugt, northwest Greenland, six sets of landforms (five buried and one on the seafloor) have been interpreted as mega-scale glacial lineations (MSGLs) that provide evidence for extensive ice streams on outer palaeo-shelves. A gradual change in mean MSGL orientation and associated depocentres through time suggests that the palaeo-ice flow and sediment transport pathways migrated in response to the evolving submarine topography through each glacial-interglacial cycle. The stratigraphy and available chronology show that the MSGLs are confined to separate stratigraphic units and were most likely formed after the onset of the Middle Pleistocene Transition at 1:3 Ma. The MSGL record in Melville Bugt suggests that since 1:3 Ma, ice streams have regularly advanced across the continental shelf during glacial stages. High-resolution buried 3D landform records such as these have not been previously observed anywhere on the Greenland continental shelf margin and provide a crucial benchmark for testing how accurately numerical models are able to recreate past configurations of the Greenland Ice Sheet. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	chronology; continental shelf; glacial-interglacial cycle; ice flow; ice sheet; ice stream; landform; Pleistocene; Arctic; Greenland; Greenland Ice Sheet; Melville Bay
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/202167
作者单位	Department of Earth and Environmental Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom; School of Natural and Built Environment, Queen's University Belfast, University Road, Belfast, BT7 1NN, United Kingdom; Department of Geophysics, Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen, 1350, Denmark
推荐引用方式 GB/T 7714	Newton A.M.W.,Huuse M.,Knutz P.C.,et al. Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition[J],2020,14(7).
APA	Newton A.M.W.,Huuse M.,Knutz P.C.,&Cox D.R..(2020).Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition.Cryosphere,14(7).
MLA	Newton A.M.W.,et al."Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition".Cryosphere 14.7(2020).