气候变化领域集成服务门户(CCPortal): Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet

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DOI	10.1016/j.quascirev.2018.10.036
	Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet
	Thorndycraft V.R.; Bendle J.M.; Benito G.; Davies B.J.; Sancho C.; Palmer A.P.; Fabel D.; Medialdea A.; Martin J.R.V.
发表日期	2019
ISSN	0277-3791
起始页码	102
结束页码	127
卷号	203
英文摘要	Modelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 ⁰S) indicate that Atlantic-Pacific drainage reversals may have caused freshwater forcing of regional climate. However, much of the region remains unmapped in detail and available geochronological data is equivocal, leading to multiple published palaeolake evolution models. We evaluate these models through new geomorphological mapping from the Baker valley; cosmogenic dating of moraine boulders that demonstrates an Antarctic Cold Reversal ice readvance that blocked drainage through the Río Baker; an altitudinal-based review of published geochronology; and regional analysis of shoreline glacio-isostasy and palaeolake levels. We use these datasets to present a new regional palaeolake evolution model underpinned by Bayesian age modelling. We demonstrate that 103 km3 of freshwater was released to the Pacific over at least 6 drainage events from before 15.3–15.0 cal yr BP to the early Holocene. The final stages of lake drainage involved catastrophic flooding along the Baker valley, evidenced by high magnitude flood landforms such as boulder bars, likely caused by failure of large valley floor moraine dams. We place these drainage events in the context of Late Quaternary meltwater pathways associated with advance/retreat of the Patagonian Ice Sheet and early human occupation across the region. Although broad patterns of ice retreat and lake formation may be similar across Patagonia, driven by Southern Hemisphere palaeoclimate, regional topographic settings likely resulted in spatial and temporal heterogeneity of Atlantic-Pacific drainage reorganisation across southernmost South America. © 2018 The Authors
英文关键词	Antarctic Cold Reversal; Bayesian age modelling; Cosmogenic isotopes; Glacial lake outburst floods (GLOFs); Palaeogeography; Palaeohydrology; Palaeolake shorelines; Pleistocene; South America
语种	英语
scopus关键词	Catchments; Floods; Geochronology; Glacial geology; Glaciers; Lakes; Landforms; Regional planning; Water; Age modelling; Antarctic cold reversals; Cosmogenic isotopes; Glacial lake outburst flood (GLOFs); Palaeogeography; Palaeohydrology; Palaeolake shorelines; Pleistocene; South America; Ice; Bayesian analysis; deglaciation; drainage; flood; geomorphological mapping; glacial lake; ice sheet; isotopic analysis; lake evolution; moraine; outburst; paleoenvironment; paleogeography; paleohydrology; Pleistocene; shoreline change; Atlantic Ocean; Pacific Ocean; Patagonia
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/152077
作者单位	Centre for Quaternary Research, Department of Geography, Royal Holloway University of London, Egham, TW20 0EX, United Kingdom; Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas, Madrid, 28006, Spain; Department of Earth Sciences, University of Zaragoza, Zaragoza, 50009, Spain; Scottish Universities Environmental Research Centre (SUERC), University of GlasgowScotland, United Kingdom; Institute of Geography, University of Cologne, Cologne, 50674, Germany
推荐引用方式 GB/T 7714	Thorndycraft V.R.,Bendle J.M.,Benito G.,et al. Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet[J],2019,203.
APA	Thorndycraft V.R..,Bendle J.M..,Benito G..,Davies B.J..,Sancho C..,...&Martin J.R.V..(2019).Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet.Quaternary Science Reviews,203.
MLA	Thorndycraft V.R.,et al."Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet".Quaternary Science Reviews 203(2019).