气候变化领域集成服务门户(CCPortal): Promising oldest ice sites in east antarctica based on thermodynamical modelling

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DOI	10.5194/tc-12-2773-2018
	Promising oldest ice sites in east antarctica based on thermodynamical modelling
	Van Liefferinge B.; Pattyn F.; Cavitte M.G.P.; Karlsson N.B.; Young D.A.; Sutter J.; Eisen O.
发表日期	2018
ISSN	19940416
卷号	12 期号:8
英文摘要	To resolve the mechanisms behind the major climate reorganisation, which occurred between 0.9 and 1.2 Ma, the recovery of a suitable 1.5 million-year-old ice core is fundamental. The quest for an Oldest Ice core requires a number of key boundary conditions, of which the poorly known basal geothermal heat flux (GHF) is lacking. We use a transient thermodynamical 1-D vertical model that solves for the rate of change of temperature in the vertical, with surface temperature and modelled GHF as boundary conditions. For each point on the ice sheet, the model is forced with variations in atmospheric conditions over the last 2 Ma and modelled ice-thickness variations. The process is repeated for a range of GHF values to determine the value of GHF that marks the limit between frozen and melting conditions over the whole ice sheet, taking into account 2 Ma of climate history. These threshold values of GHF are statistically compared to existing GHF data sets. The new probabilistic GHF fields obtained for the ice sheet thus provide the missing boundary conditions in the search for Oldest Ice. High spatial resolution radar data are examined locally in the Dome Fuji and Dome C regions, as these represent the ice core community's primary drilling sites. GHF, bedrock variability, ice thickness and other essential criteria combined highlight a dozen major potential Oldest Ice sites in the vicinity of Dome Fuji and Dome C, where GHF could allow for Oldest Ice. © Author(s) 2018.
学科领域	boundary condition; heat flux; ice core; ice sheet; ice thickness; modeling; one-dimensional modeling; radar; spatial resolution; surface temperature; thermodynamics; Antarctica; Dome Concordia; Dome Fuji; East Antarctica
语种	英语
scopus关键词	boundary condition; heat flux; ice core; ice sheet; ice thickness; modeling; one-dimensional modeling; radar; spatial resolution; surface temperature; thermodynamics; Antarctica; Dome Concordia; Dome Fuji; 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/119077
作者单位	Laboratoire de Glaciologie, Université Libre de Bruxelles, CP 160/03, Avenue F.D. Roosevelt 50, Brussels, 1050, Belgium; 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; Alfred Wegener Institute Helmholtz-Centre for Polar and Marine Research, Bremerhaven, 27568, Germany; Climate and Environmental Physics, Physics Institute, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Department of Geosciences, University of Bremen, Bremen, Germany; Geological Survey of Denmark and Greenland (GEUS), Oster Voldgade 10, Copenhagen, 1350, Denmark
推荐引用方式 GB/T 7714	Van Liefferinge B.,Pattyn F.,Cavitte M.G.P.,et al. Promising oldest ice sites in east antarctica based on thermodynamical modelling[J],2018,12(8).
APA	Van Liefferinge B..,Pattyn F..,Cavitte M.G.P..,Karlsson N.B..,Young D.A..,...&Eisen O..(2018).Promising oldest ice sites in east antarctica based on thermodynamical modelling.Cryosphere,12(8).
MLA	Van Liefferinge B.,et al."Promising oldest ice sites in east antarctica based on thermodynamical modelling".Cryosphere 12.8(2018).