Global S&T Development Trend Analysis Platform of Resources and Environment
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 | |
Andrew J. Christ; Paul R. Bierman; Joerg M. Schaefer; Dorthe Dahl-Jensen; Jørgen P. Steffensen; Lee B. Corbett; Dorothy M. Peteet; Elizabeth K. Thomas; Eric J. Steig; Tammy M. Rittenour; Jean-Louis Tison; Pierre-Henri Blard; Nicolas Perdrial; David P. Dethier; Andrea Lini; Alan J. Hidy; Marc W. Caffee; John Southon | |
2021-03-30 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2021 |
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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/319885 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Andrew J. Christ,Paul R. Bierman,Joerg M. Schaefer,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]. Proceedings of the National Academy of Science,2021. |
APA | Andrew J. Christ.,Paul R. Bierman.,Joerg M. Schaefer.,Dorthe Dahl-Jensen.,Jørgen P. Steffensen.,...&John Southon.(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 Science. |
MLA | Andrew J. Christ,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 Science (2021). |
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