气候变化领域集成服务门户(CCPortal): 10Be age constraints on latest Pleistocene and Holocene cirque glaciation across the western United States

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DOI	10.1038/s41612-019-0062-z
	10Be age constraints on latest Pleistocene and Holocene cirque glaciation across the western United States
	Marcott S.A.; Clark P.U.; Shakun J.D.; Brook E.J.; Davis P.T.; Caffee M.W.
发表日期	2019
ISSN	23973722
卷号	2 期号:1
英文摘要	Well-dated records of alpine glacier fluctuations provide important insights into the temporal and spatial structure of climate variability. Cirque moraine records from the western United States have historically been interpreted as a resurgence of alpine glaciation in the middle-to-late Holocene (i.e., Neoglaciation), but these moraines remain poorly dated because of limited numerical age constraints at most locations. Here we present 130 10Be ages on 19 moraines deposited by 14 cirque glaciers across this region that have been interpreted as recording these Neoglacial advances. Our 10Be chronology indicates instead that these moraines were deposited during the latest Pleistocene to earliest Holocene, with several as old as 14–15ka. Our results thus show that glaciers retreated from their Last Glacial Maximum (LGM) extent into cirques relatively early during the last deglaciation, experienced small fluctuations during the Bølling–Allerød–Younger Dryas interval, and remained within the maximum limit of the Little Ice Age (LIA) advance of the last several centuries throughout most of the Holocene. Climate modeling suggests that increasing local summer insolation and greenhouse gases were the primary controls on early glacier retreat from their LGM positions. We then infer that subsequent intrinsic climate variability and Younger Dryas cooling caused minor fluctuations during the latest Pleistocene, while the LIA advance represents the culmination of a cooling trend through the Holocene in response to decreasing boreal summer insolation. © 2019, The Author(s).
语种	英语
scopus关键词	age determination; Allerod; beryllium isotope; Bolling; chronology; cirque; glaciation; glacier retreat; Last Glacial Maximum; Little Ice Age; moraine; Pleistocene-Holocene boundary; Younger Dryas; United States
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178120
作者单位	Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, United States; Department of Natural and Applied Sciences, Bentley University, Waltham, MA 02452, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States
推荐引用方式 GB/T 7714	Marcott S.A.,Clark P.U.,Shakun J.D.,et al. 10Be age constraints on latest Pleistocene and Holocene cirque glaciation across the western United States[J],2019,2(1).
APA	Marcott S.A.,Clark P.U.,Shakun J.D.,Brook E.J.,Davis P.T.,&Caffee M.W..(2019).10Be age constraints on latest Pleistocene and Holocene cirque glaciation across the western United States.npj Climate and Atmospheric Science,2(1).
MLA	Marcott S.A.,et al."10Be age constraints on latest Pleistocene and Holocene cirque glaciation across the western United States".npj Climate and Atmospheric Science 2.1(2019).