气候变化领域集成服务门户(CCPortal): The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today

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DOI	10.1029/2019GL085176
	The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today
	Christ A.J.; Bierman P.R.; Knutz P.C.; Corbett L.B.; Fosdick J.C.; Thomas E.K.; Cowling O.C.; Hidy A.J.; Caffee M.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. Here, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Glacial geology; Glaciers; Isotopes; Phosphate minerals; Climate proxies; Cosmogenic nuclides; Lipid biomarkers; Paleoclimates; Thermochronology; Ice; apatite; biomarker; cosmogenic radionuclide; detrital deposit; glaciation; ice sheet; lipid; paleoclimate; Pleistocene; proxy climate record; thermochronology; Arctic; Greenland; Greenland Ice Sheet
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/170892
作者单位	Department of Geology, University of Vermont, Burlington, VT, United States; Gund Institute for Environment, University of Vermont, Burlington, VT, United States; Geophysics Department, Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Department of Geosciences, University of Connecticut, Storrs, CT, United States; Department of Geology, State University of New York at Buffalo, Buffalo, NY, United States; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Christ A.J.,Bierman P.R.,Knutz P.C.,et al. The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today[J],2020,47(1).
APA	Christ A.J..,Bierman P.R..,Knutz P.C..,Corbett L.B..,Fosdick J.C..,...&Caffee M.W..(2020).The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today.Geophysical Research Letters,47(1).
MLA	Christ A.J.,et al."The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today".Geophysical Research Letters 47.1(2020).