气候变化领域集成服务门户(CCPortal): New in situ 14C data indicate the absence of nunataks in west Greenland during the Last Glacial Maximum

CCPortal

DOI	10.1016/j.quascirev.2019.105981
	New in situ 14C data indicate the absence of nunataks in west Greenland during the Last Glacial Maximum
	Graham B.L.; Briner J.P.; Schweinsberg A.D.; Lifton N.A.; Bennike O.
发表日期	2019
ISSN	0277-3791
卷号	225
英文摘要	In situ cosmogenic nuclide exposure age distributions on Ice Age nunataks act as past ice thickness indicators and provide valuable targets for ice sheet model simulations of the Last Glacial Maximum. Several locations along West Greenland have been identified as being potential nunataks due to their weathered nature and their high cosmogenic nuclide inventories with little evidence for ice sheet burial. We present new in situ cosmogenic 14C measurements from four high elevation surfaces in the central Uummannaq Fjord system that were identified as potential nunataks in prior work. Building on previous work, we model cosmogenic radionuclide production and decay, and consider a range of ice sheet history scenarios. Since our results require more burial or shielding under ice than what independent methods suggest for Holocene ice cap cover, we propose that these locations were not nunataks during the Last Glacial Maximum, but rather were buried during the peak of the Last Glacial Maximum. However, we cannot confirm whether these sites were buried by the Greenland Ice Sheet or local glaciers. © 2019 Elsevier Ltd
英文关键词	Cosmogenic in situ 14C; Greenland; Holocene; Modelling; Neoglaciation; Pleistocene
语种	英语
scopus关键词	Glacial geology; Glaciers; Isotopes; Models; Cosmogenic; Greenland; Holocenes; Neoglaciation; Pleistocene; Ice; carbon isotope; cosmogenic radionuclide; elevation; Holocene; ice cap; ice cover; ice sheet; ice thickness; Last Glacial Maximum; Neoglacial; Pleistocene; Arctic; Greenland; Greenland Ice Sheet; Uummannaq
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151705
作者单位	Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, United States; Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen k, DK-1350, Denmark
推荐引用方式 GB/T 7714	Graham B.L.,Briner J.P.,Schweinsberg A.D.,et al. New in situ 14C data indicate the absence of nunataks in west Greenland during the Last Glacial Maximum[J],2019,225.
APA	Graham B.L.,Briner J.P.,Schweinsberg A.D.,Lifton N.A.,&Bennike O..(2019).New in situ 14C data indicate the absence of nunataks in west Greenland during the Last Glacial Maximum.Quaternary Science Reviews,225.
MLA	Graham B.L.,et al."New in situ 14C data indicate the absence of nunataks in west Greenland during the Last Glacial Maximum".Quaternary Science Reviews 225(2019).