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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, Paul C.1; Newton, Andrew M. W.2,3; Hopper, John R.1; Huuse, Mads2; Gregersen, Ulrik1; Sheldon, Emma1; Dybkjaer, Karen1 | |
2019-05-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:5页码:361-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Denmark; England; North Ireland |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467814100012 |
WOS关键词 | SEISMIC ARCHITECTURE ; CONTINENTAL-MARGIN ; SEA-LEVEL ; PLIOCENE ; WEST ; MOUTH ; EVOLUTION ; HISTORY ; VOLUME ; RECORD |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183090 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Geol Survey Denmark & Greenland, Copenhagen, Denmark; 2.Univ Manchester, Sch Earth & Environm Sci, Manchester, Lancs, England; 3.Queens Univ Belfast, Sch Nat & Built Environm, Belfast, Antrim, North Ireland |
推荐引用方式 GB/T 7714 | Knutz, Paul C.,Newton, Andrew M. W.,Hopper, John R.,et al. Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years[J]. NATURE GEOSCIENCE,2019,12(5):361-+. |
APA | Knutz, Paul C..,Newton, Andrew M. W..,Hopper, John R..,Huuse, Mads.,Gregersen, Ulrik.,...&Dybkjaer, Karen.(2019).Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years.NATURE GEOSCIENCE,12(5),361-+. |
MLA | Knutz, Paul 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-+. |
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