气候变化领域集成服务门户(CCPortal): A comprehensive interpretation of the NEEM basal ice build-up using a multi-parametric approach

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DOI	10.5194/tc-10-553-2016
	A comprehensive interpretation of the NEEM basal ice build-up using a multi-parametric approach
	Goossens T.; Sapart C.J.; Dahl-Jensen D.; Popp T.; Amri S.E.; Tison J.-L.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
英文摘要	Basal ice is a common expression to describe bottom ice layers of glaciers, ice caps and ice sheets in which the ice is primarily conditioned by processes operating at the bed. It is chemically and/or physically distinct from the ice above and can be characterized by a component of basally derived sediments. The study of basal ice properties provides a rare opportunity to improve our understanding of subglacial environments and processes and to refine ice sheet behaviour modelling. Here, we present and discuss the results of water stable isotopes (δ18O and δD), ice fabrics, debris weight/size distribution and gas content of the basal part of the NEEM (North Greenland Eemian Ice Drilling Project) ice core. Below a depth of 2533.85 m, almost 10 m of basal debris-rich material was retrieved from the borehole, and regular occurrence of frozen sediments with only interstitial ice lenses in the bottom 5 m suggest that the ice-bedrock interface was reached. The sequence is composed of an alternation of three visually contrasting types of ice: clear ice with specks (very small amounts) of particulate inclusions, stratified debris-rich layers and ice containing dispersed debris. The use of water stable isotope signatures (δ18O and δD), together with other parameters, allows discrimination between the different types of ice and to unravel the processes involved in their formation and transformation. The basal debris-rich material presents δ18O values [−39.9 ‰; −34.4 ‰] within the range of the above last 300 m of unaltered meteoric ice [−44.9 ‰; −30.6 ‰] spanning a glacial-interglacial range of values. This rules out the hypothesis of a basal ice layer originating from pre-ice sheet ice overridden by the growing ice sheet, as previously suggested e.g. in the case of GRIP (Greenland Ice Core Project). We show that clear basal ice with specks corresponds to altered meteoric glacial ice where some of the climatic signal could have been preserved. However, the stratified debris-rich layers and the ice containing dispersed debris layers respectively express an "open" or "closed" system melting/refreezing signature, somewhat blurred by mixing processes in the upper part of the sequence. Climatic reconstruction is therefore prohibited from these ice types. We propose a first interpretative framework for the build-up of the NEEM basal ice sequence, based on the origin of the various ice types. © Author(s) 2016.
学科领域	basal ice; climate signal; GRIP; ice core; ice sheet; reconstruction; stable isotope; subglacial environment
语种	英语
scopus关键词	basal ice; climate signal; GRIP; ice core; ice sheet; reconstruction; stable isotope; subglacial environment
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/119690
作者单位	Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, 1050, Belgium; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, 3584CC, Netherlands; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark
推荐引用方式 GB/T 7714	Goossens T.,Sapart C.J.,Dahl-Jensen D.,et al. A comprehensive interpretation of the NEEM basal ice build-up using a multi-parametric approach[J],2016,10(2).
APA	Goossens T.,Sapart C.J.,Dahl-Jensen D.,Popp T.,Amri S.E.,&Tison J.-L..(2016).A comprehensive interpretation of the NEEM basal ice build-up using a multi-parametric approach.Cryosphere,10(2).
MLA	Goossens T.,et al."A comprehensive interpretation of the NEEM basal ice build-up using a multi-parametric approach".Cryosphere 10.2(2016).