气候变化领域集成服务门户(CCPortal): A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century

CCPortal

DOI	10.1073/pnas.2021442118
	A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century
	Christ A.J.; Bierman P.R.; Schaefer J.M.; Dahl-Jensen D.; Steffensen J.P.; Corbett L.B.; Peteet D.M.; Thomas E.K.; Steig E.J.; Rittenour T.M.; Tison J.-L.; Blard P.-H.; Perdrial N.; Dethier D.P.; Lini A.; Hidy A.J.; Caffee M.W.; Southon J.
发表日期	2021
ISSN	00278424
卷号	118 期号:13
英文摘要	Understanding the history of the Greenland Ice Sheet (GrIS) is critical for determining its sensitivity to warming and contribution to sea level; however, that history is poorly known before the last interglacial. Most knowledge comes from interpretation of marine sediment, an indirect record of past ice-sheet extent and behavior. Subglacial sediment and rock, retrieved at the base of ice cores, provide terrestrial evidence for GrIS behavior during the Pleistocene. Here, we use multiple methods to determine GrIS history from subglacial sediment at the base of the Camp Century ice core collected in 1966. This material contains a stratigraphic record of glaciation and vegetation in northwestern Greenland spanning the Pleistocene. Enriched stable isotopes of pore-ice suggest precipitation at lower elevations implying ice-sheet absence. Plant macrofossils and biomarkers in the sediment indicate that paleo-ecosystems from previous interglacial periods are preserved beneath the GrIS. Cosmogenic 26Al/10Be and luminescence data bracket the burial of the lower-most sediment between <3.2 ± 0.4 Ma and >0.7 to 1.4 Ma. In the upper-most sediment, cosmogenic 26Al/10Be data require exposure within the last 1.0 ± 0.1 My. The unique subglacial sedimentary record from Camp Century documents at least two episodes of ice-free, vegetated conditions, each followed by glaciation. The lower sediment derives from an Early Pleistocene GrIS advance. 26Al/10Be ratios in the upper-most sediment match those in subglacial bedrock from central Greenland, suggesting similar ice-cover histories across the GrIS. We conclude that the GrIS persisted through much of the Pleistocene but melted and reformed at least once since 1.1 Ma. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Arctic; Climate; Ice core; Ice sheet; Pleistocene
语种	英语
scopus关键词	aluminum 26; beryllium; documentation; energy dispersive X ray spectroscopy; geochemistry; glacial period; glaciation; Greenland; luminescence; macrofossil; paleoclimate; Pleistocene; precipitation; priority journal; Review; scanning electron microscopy; sediment; vegetation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180118
作者单位	Department of Geology, University of Vermont, Burlington, VT 05405, United States; Gund Institute for Environment, University of Vermont, Burlington, VT 05405, United States; Rubenstein School of the Environment and Natural Resources, University of Vermont, Burlington, VT 05405, United States; Lamont Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Centre for Ice and Climate, PICE, Niels Bohr Institute, University of Copenhagen, Copenhagen, 2200, Denmark; Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; NASA/Goddard Institute for Space Studies, New York, NY 10025, United States; Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA 98105, United States; Department of Geosciences, Utah State University, Logan, UT 84322, United States; Laboratoire de Glaciologie, DGES-IGEOS, Université Libre de Bruxelles, Bruxelles, 105...
推荐引用方式 GB/T 7714	Christ A.J.,Bierman P.R.,Schaefer J.M.,et al. A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century[J],2021,118(13).
APA	Christ A.J..,Bierman P.R..,Schaefer J.M..,Dahl-Jensen D..,Steffensen J.P..,...&Southon J..(2021).A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century.Proceedings of the National Academy of Sciences of the United States of America,118(13).
MLA	Christ A.J.,et al."A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century".Proceedings of the National Academy of Sciences of the United States of America 118.13(2021).