气候变化领域集成服务门户(CCPortal): Long-Term Increase in Antarctic Ice Sheet Vulnerability Driven by Bed Topography Evolution

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DOI	10.1029/2020GL090003
	Long-Term Increase in Antarctic Ice Sheet Vulnerability Driven by Bed Topography Evolution
	Paxman G.J.G.; Gasson E.G.W.; Jamieson S.S.R.; Bentley M.J.; Ferraccioli F.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	Ice sheet behavior is strongly influenced by the bed topography. However, the effect of the progressive temporal evolution of Antarctica's subglacial landscape on the sensitivity of the Antarctic Ice Sheet (AIS) to climatic and oceanic change has yet to be fully quantified. Here we investigate the evolving sensitivity of the AIS using a series of data-constrained reconstructions of Antarctic paleotopography since glacial inception at the Eocene-Oligocene transition. We use a numerical ice sheet model to subject the AIS to schematic climate and ocean warming experiments and find that bed topographic evolution causes a doubling in ice volume loss and equivalent global sea level rise. Glacial erosion is primarily responsible for enhanced ice sheet retreat via the development of increasingly low-lying and reverse sloping beds over time, particularly within near-coastal subglacial basins. We conclude that AIS sensitivity to climate and ocean forcing has been substantially amplified by long-term landscape evolution. ©2020. The Authors.
英文关键词	Automatic identification; Climate models; Glacial geology; Glaciers; Sea level; Topography; Antarctic ice sheets; Constrained reconstruction; Glacial erosion; Global sea level rise; Ice sheet models; Ice-sheet retreat; Landscape evolutions; Temporal evolution; Ice; Eocene-Oligocene boundary; ice retreat; ice sheet; landscape evolution; paleotopography; sea ice; sea level change; temporal evolution; Antarctic Ice Sheet; Antarctica; Antarctica
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169592
作者单位	Department of Geography, Durham University, Durham, United Kingdom; Now at Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Paxman G.J.G.,Gasson E.G.W.,Jamieson S.S.R.,et al. Long-Term Increase in Antarctic Ice Sheet Vulnerability Driven by Bed Topography Evolution[J],2020,47(20).
APA	Paxman G.J.G.,Gasson E.G.W.,Jamieson S.S.R.,Bentley M.J.,&Ferraccioli F..(2020).Long-Term Increase in Antarctic Ice Sheet Vulnerability Driven by Bed Topography Evolution.Geophysical Research Letters,47(20).
MLA	Paxman G.J.G.,et al."Long-Term Increase in Antarctic Ice Sheet Vulnerability Driven by Bed Topography Evolution".Geophysical Research Letters 47.20(2020).