气候变化领域集成服务门户(CCPortal): Holocene glacier fluctuations on the northern flank of Cordillera Darwin; southernmost South America

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DOI	10.1016/j.quascirev.2019.105904
	Holocene glacier fluctuations on the northern flank of Cordillera Darwin; southernmost South America
	Hall B.L.; Lowell T.V.; Bromley G.R.M.; Denton G.H.; Putnam A.E.
发表日期	2019
ISSN	0277-3791
卷号	222
英文摘要	Records of past variability afford context for evaluating present-day glacier behavior and for testing hypotheses of climate change. Here, we use 69 radiocarbon dates of wood and other organic materials in association with glacial deposits to document the behavior of Ventisqueros Marinelli and Brooks in Cordillera Darwin over the past ∼17,000 years. Recession from the last glacial maximum was early, with most occurring prior to 17,000 yr BP. Any glacial resurgence during the Antarctic Cold Reversal must have terminated within the bounds of Holocene ice fluctuations. By early Holocene time, Ventisquero Marinelli had retreated such that it was no more extensive than it was in AD 1992. We identify several subsequent glacier readvances, but also note long periods of restricted ice extent, particularly in the mid-Holocene. There were times when Holocene glaciers must have been smaller than at present. Our new record from Marinelli shows similarities to other reconstructions of Holocene glacier variation from southern South America, such as at Mt. Sarmiento and the South Patagonian Icefield, suggesting an underlying climate signal. The overall implication is of substantial early Holocene deglaciation followed by repeated advances interspersed with periods of recession when ice extent was smaller than at present. This general pattern of glacier behavior appears to differ from that of New Zealand's Southern Alps and points to the value of a geographic spread of datasets to elucidate the pattern of Southern Hemisphere climate during the Holocene. © 2019 Elsevier Ltd
英文关键词	Chronology; Cordillera Darwin; Glacial extent; Holocene; Radiocarbon
语种	英语
scopus关键词	Climate change; Glacial geology; Chronology; Cordillera Darwin; Glacial extent; Holocenes; Radiocarbon; Ice; chronology; climate variation; deglaciation; glacial deposit; glacier retreat; Holocene; Last Glacial Maximum; new record; organic matter; radiocarbon dating; Southern Hemisphere; wood; Alberta; Brooks; Canada; Chile; Cordillera Darwin; Isla Grande de Tierra del Fuego; Magallanes; Mount Sarmiento; New Zealand; South America; South Island; Southern Alps
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151754
作者单位	School of Earth and Climate Sciences and the Climate Change Institute, University of Maine, United States; Department of Geology, University of Cincinnati, United States; School of Geography and Archaeology, NUI Galway, Ireland
推荐引用方式 GB/T 7714	Hall B.L.,Lowell T.V.,Bromley G.R.M.,et al. Holocene glacier fluctuations on the northern flank of Cordillera Darwin; southernmost South America[J],2019,222.
APA	Hall B.L.,Lowell T.V.,Bromley G.R.M.,Denton G.H.,&Putnam A.E..(2019).Holocene glacier fluctuations on the northern flank of Cordillera Darwin; southernmost South America.Quaternary Science Reviews,222.
MLA	Hall B.L.,et al."Holocene glacier fluctuations on the northern flank of Cordillera Darwin; southernmost South America".Quaternary Science Reviews 222(2019).