气候变化领域集成服务门户(CCPortal): Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years

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DOI	10.1038/s41561-019-0340-8
	Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years
	Knutz P.C.; Newton A.M.W.; Hopper J.R.; Huuse M.; Gregersen U.; Sheldon E.; Dybkjær K.
发表日期	2019
ISSN	17520894
EISSN	1752-0908
卷号	12 期号:5 页码:361-+
英文摘要	The reconstruction of former ice sheets is important for testing Earth system models that can assess interactions between polar ice sheets and global climate, but information retrieved from contemporary glaciated margins is sparse. In particular, we need to know when ice sheets began to form marine outlets and the mechanisms by which they advance and retreat over timescales from decades to millions of years. Here, we use a dense grid of high-quality two-dimensional seismic reflection data to examine the stratigraphy and evolution of glacial outlets, or palaeo-ice streams, that drained the northwest Greenland Ice Sheet into Baffin Bay. Seismic horizons are partly age constrained by correlation with cores from drill sites. Progradational units separated by onlap surfaces record 11 major phases of shelf-edge ice advance and subsequent transgression since the first ice-sheet expansion 3.3–2.6 million years ago. The glacial outlet system appears to have developed in four stages, each potentially caused by tectonic and climatic changes. We infer that an abrupt change in ice-flow conditions occurred during the mid-Pleistocene transition, about 1 million years ago, when ice movement across the shelf margin changed from widespread to a more focused flow (ice streams), forming the present-day glacial troughs. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
WOS研究方向	Geology
scopus关键词	climate modeling; glacier advance; global climate; ice movement; ice retreat; ice sheet; ice stream; marginal ice zone; paleoenvironment; Pleistocene; progradation; reconstruction; seismic reflection; shelf break; Arctic; Arctic Ocean; Baffin Bay [Arctic Ocean]; Greenland; Greenland Ice Sheet
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/96785
作者单位	Geological Survey of Denmark and Greenland, Copenhagen, Denmark; School of Earth and Environmental Sciences, The University of Manchester, Manchester, United Kingdom; School of Natural and Built Environment, Queen’s University Belfast, Belfast, United Kingdom
推荐引用方式 GB/T 7714	Knutz P.C.,Newton A.M.W.,Hopper J.R.,et al. Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years[J],2019,12(5):361-+.
APA	Knutz P.C..,Newton A.M.W..,Hopper J.R..,Huuse M..,Gregersen U..,...&Dybkjær K..(2019).Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years.Nature Geoscience,12(5),361-+.
MLA	Knutz P.C.,et al."Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years".Nature Geoscience 12.5(2019):361-+.