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DOI | 10.1016/j.epsl.2020.116115 |
Ice sheet influence on atmospheric circulation explains the patterns of Pleistocene alpine glacier records in North America | |
Tulenko J.P.; Lofverstrom M.; Briner J.P. | |
发表日期 | 2020 |
ISSN | 0012821X |
卷号 | 534 |
英文摘要 | We explore the hypothesis that the relative size of Pleistocene ice sheets in North America modulated regional climate and alpine glaciation. We compare Pleistocene alpine glacier chronologies across North America with a comprehensive general circulation model using reconstructed ice sheet extents at peak glacial conditions during Marine Isotope Stage (MIS) 2 and MIS 4. The effect of continent-wide ice sheets on atmospheric circulation during MIS 2 led to warming in Beringia and cooling in the western US; less expansive ice sheets during MIS 4 resulted in weaker ice sheet modulation of atmospheric circulation. This led to preservation of MIS 4 moraines in Beringia due to limited MIS 2 glaciation (resulting in a MIS 2/4 moraine sequence) and overriding of MIS 4 moraines – for sites with existing chronologies – in the western United States during MIS 2 (resulting in a MIS 2/6 moraine sequence). Our results highlight how influential ice sheets are for regional climate conditions. © 2020 Elsevier B.V. |
关键词 | alpine glaciersBeringiaLaurentide Ice SheetMarine Isotope Stage 2Marine Isotope Stage 4Western US |
英文关键词 | Climatology; Glacial geology; Glaciers; Isotopes; Alpine glacier; Atmospheric circulation; Beringia; General circulation model; Laurentide ice sheets; Marine isotope stages; Regional climate; Western United States; Ice; atmospheric circulation; Beringia; climate variation; ice sheet; Laurentide Ice Sheet; marine isotope stage; paleoatmosphere; paleoclimate; Pleistocene; regional climate; valley glacier; North America |
语种 | 英语 |
来源期刊 | Earth and Planetary Science Letters |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/202938 |
作者单位 | Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States |
推荐引用方式 GB/T 7714 | Tulenko J.P.,Lofverstrom M.,Briner J.P.. Ice sheet influence on atmospheric circulation explains the patterns of Pleistocene alpine glacier records in North America[J],2020,534. |
APA | Tulenko J.P.,Lofverstrom M.,&Briner J.P..(2020).Ice sheet influence on atmospheric circulation explains the patterns of Pleistocene alpine glacier records in North America.Earth and Planetary Science Letters,534. |
MLA | Tulenko J.P.,et al."Ice sheet influence on atmospheric circulation explains the patterns of Pleistocene alpine glacier records in North America".Earth and Planetary Science Letters 534(2020). |
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