气候变化领域集成服务门户(CCPortal): Is there 1.5-million-year-old ice near Dome C, Antarctica?

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DOI	10.5194/tc-11-2427-2017
	Is there 1.5-million-year-old ice near Dome C, Antarctica?
	Parrenin F.; Cavitte M.G.P.; Blankenship D.D.; Chappellaz J.; Fischer H.; Gagliardini O.; Masson-Delmotte V.; Passalacqua O.; Ritz C.; Roberts J.; Siegert M.J.; Young D.A.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Ice sheets provide exceptional archives of past changes in polar climate, regional environment and global atmospheric composition. The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ∼ 800 000 years. Obtaining an older paleoclimatic record from Antarctica is one of the greatest challenges of the ice core community. Here, we use internal isochrones, identified from airborne radar coupled to ice-flow modelling to estimate the age of basal ice along transects in the Dome C area. Three glaciological properties are inferred from isochrones: surface accumulation rate, geothermal flux and the exponent of the Lliboutry velocity profile. We find that old ice (> 1.5 Myr, 1.5 million years) likely exists in two regions: one ∼ 40 km south-west of Dome C along the ice divide to Vostok, close to a secondary dome that we name "Little Dome C" (LDC), and a second region named "North Patch" (NP) located 10–30 km north-east of Dome C, in a region where the geothermal flux is apparently relatively low. Our work demonstrates the value of combining radar observations with ice flow modelling to accurately represent the true nature of ice flow, and understand the formation of ice-sheet architecture, in the centre of large ice sheets.
学科领域	age determination; basal ice; flow modeling; ice core; ice flow; ice sheet; paleoclimate; proxy climate record; radar; Antarctica; Dome Concordia; East Antarctica
语种	英语
scopus关键词	age determination; basal ice; flow modeling; ice core; ice flow; ice sheet; paleoclimate; proxy climate record; radar; Antarctica; Dome Concordia; East Antarctica
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/119319
作者单位	Univ. Grenoble Alpes, CNRS, IRD, IGE, Grenoble, 38000, France; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Climate and Environmental Physics, Physics Institute, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ/IPSL, UMR8212, Gif-sur-Yvette, France; Australian Antarctic Division, Kingston, TAS 7050, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS 7001, Australia; Grantham Institute, Department of Earth Science and Engineering, Imperial College London, London, United Kingdom
推荐引用方式 GB/T 7714	Parrenin F.,Cavitte M.G.P.,Blankenship D.D.,et al. Is there 1.5-million-year-old ice near Dome C, Antarctica?[J],2017,11(6).
APA	Parrenin F..,Cavitte M.G.P..,Blankenship D.D..,Chappellaz J..,Fischer H..,...&Young D.A..(2017).Is there 1.5-million-year-old ice near Dome C, Antarctica?.Cryosphere,11(6).
MLA	Parrenin F.,et al."Is there 1.5-million-year-old ice near Dome C, Antarctica?".Cryosphere 11.6(2017).