globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2689
论文题名:
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history
作者: Rogozhina I.; Petrunin A.G.; Vaughan A.P.M.; Steinberger B.; Johnson J.V.; Kaban M.K.; Calov R.; Rickers F.; Thomas M.; Koulakov I.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:5
起始页码: 366
结束页码: 369
语种: 英语
Scopus关键词: basal ice ; glaciation ; ice core ; ice cover ; ice sheet ; ice stream ; mantle plume ; radar ; subglacial environment ; Arctic ; Greenland ; Greenland Ice Sheet ; Iceland
英文摘要: Ice-penetrating radar and ice core drilling have shown that large parts of the north-central Greenland ice sheet are melting from below. It has been argued that basal ice melt is due to the anomalously high geothermal flux that has also influenced the development of the longest ice stream in Greenland. Here we estimate the geothermal flux beneath the Greenland ice sheet and identify a 1,200-km-long and 400-km-wide geothermal anomaly beneath the thick ice cover. We suggest that this anomaly explains the observed melting of the ice sheet's base, which drives the vigorous subglacial hydrology and controls the position of the head of the enigmatic 750-km-long northeastern Greenland ice stream. Our combined analysis of independent seismic, gravity and tectonic data implies that the geothermal anomaly, which crosses Greenland from west to east, was formed by Greenland's passage over the Iceland mantle plume between roughly 80 and 35 million years ago. We conclude that the complexity of the present-day subglacial hydrology and dynamic features of the north-central Greenland ice sheet originated in tectonic events that pre-date the onset of glaciation in Greenland by many tens of millions of years. © 2016 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106012
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Helmholtz Centre, Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany; Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Faculty of Earth Sciences, Goethe University, Frankfurt am Main, Germany; Schmidt Institute of Physics of the Earth, Moscow, Russian Federation; Midland Valley Exploration Ltd, Glasgow, United Kingdom; Department of Geology, Trinity College, Dublin 2, Ireland; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway; Department of Computer Science, University of Montana, Missoula, MN, United States; Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany; Department of Earth Sciences, Utrecht University, TC Utrecht, Netherlands; Berlin Free University, Institute of Meteorology, Faculty of Geosciences, Berlin, Germany; Institute of Petroleum Geology and Geophysics, Novosibirsk, Russian Federation; Geological Department, Novosibirsk State University, Novosibirsk, Russian Federation

Recommended Citation:
Rogozhina I.,Petrunin A.G.,Vaughan A.P.M.,et al. Melting at the base of the Greenland ice sheet explained by Iceland hotspot history[J]. Nature Geoscience,2016-01-01,9(5)
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