气候变化领域集成服务门户(CCPortal): Termination II, Last Glacial Maximum, and Lateglacial chronologies and paleoclimate from Big Cottonwood Canyon, Wasatch Mountains, Utah

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DOI	10.1130/B31967.1
	Termination II, Last Glacial Maximum, and Lateglacial chronologies and paleoclimate from Big Cottonwood Canyon, Wasatch Mountains, Utah
	Quirk B.J.; Moore J.R.; Laabs B.J.C.; Caffee M.W.; Plummer M.A.
发表日期	2018
ISSN	167606
起始页码	1889
结束页码	1902
卷号	130 期号:2021-11-12
英文摘要	Late Pleistocene glaciers and lakes of the Great Basin have been studied extensively due to their excellent utility as paleoclimate proxies; such records are particularly useful where interpreted in combination. The Wasatch Range on the eastern edge of the Great Basin hosted extensive glaciers during the Last Glacial Maximum (LGM), in addition to Lake Bonneville, the region's largest pluvial lake. However, the timing of rangewide glaciation in the Wasatch remains uncertain as compared to the well-established Lake Bonneville chronology. Here we present new cosmogenic exposure ages from the Wasatch Range from low altitude striated bedrock (132.2 ± 5.9 ka), lateral moraine (20.2 ± 1.1 ka), nested moraines (15.5 ± 0.8 ka), and high-altitude bedrock (14.8 ± 0.7 ka) sites. These ages broadly reveal the local timing of Termination II, LGM, and Lateglacial stadia in the Wasatch, as well as subsequent deglaciation. We then use coupled glacier energy-mass balance and ice-flow models to reconstruct LGM and Lateglacial ice extents in order to determine paleoclimate conditions necessary to produce glacier extents and estimate LGM ice extents in a catchment lacking clear terminus features. Our results provide robust limits on the extents of late Pleistocene glaciers in three drainages of the central Wasatch Mountains and suggest that LGM glaciers reached and abandoned their maxima prior to the Bonneville highstand, while later undergoing rapid deglaciation coeval with the lake's fall from the Provo level. Combining modeled paleoclimate estimates with previously published pluvial lake reconstructions yields LGM temperature depressions ranging from -10 to -8 °C (with respect to modern) with 80-150% of modern precipitation, with a best matching Lateglacial temperature depression of -5 °C with 200% of modern precipitation. These results support the hypothesis of a relatively cold LGM climate in the Great Basin with little to no increase in precipitation, followed by a period of increased precipitation and warming coincident with Heinrich Stadial 1. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184994
作者单位	Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, United States; Department of Geosciences, North Dakota State University, Fargo, ND 68102, United States; Department of Physics, PRIME Lab, Purdue University, West Lafayette, IN 47905, United States; Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID 83415, United States
推荐引用方式 GB/T 7714	Quirk B.J.,Moore J.R.,Laabs B.J.C.,et al. Termination II, Last Glacial Maximum, and Lateglacial chronologies and paleoclimate from Big Cottonwood Canyon, Wasatch Mountains, Utah[J],2018,130(2021-11-12).
APA	Quirk B.J.,Moore J.R.,Laabs B.J.C.,Caffee M.W.,&Plummer M.A..(2018).Termination II, Last Glacial Maximum, and Lateglacial chronologies and paleoclimate from Big Cottonwood Canyon, Wasatch Mountains, Utah.Bulletin of the Geological Society of America,130(2021-11-12).
MLA	Quirk B.J.,et al."Termination II, Last Glacial Maximum, and Lateglacial chronologies and paleoclimate from Big Cottonwood Canyon, Wasatch Mountains, Utah".Bulletin of the Geological Society of America 130.2021-11-12(2018).