气候变化领域集成服务门户(CCPortal): Neoglacial increase in high-magnitude glacial lake outburst flood frequency; upper Baker River; Chilean Patagonia (47°S)

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DOI	10.1016/j.quascirev.2020.106572
	Neoglacial increase in high-magnitude glacial lake outburst flood frequency; upper Baker River; Chilean Patagonia (47°S)
	Vandekerkhove E.; Bertrand S.; Mauquoy D.; McWethy D.; Reid B.; Stammen S.; Saunders K.M.; Torrejón F.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	Glacial Lake Outburst Floods (GLOFs) constitute a major threat in glacierized regions. Despite a recent increase in the size and number of glacial lakes worldwide, there is only limited evidence that climate change is affecting GLOF frequency. GLOFs are particularly common in the Baker River watershed (Patagonia, 47°S), where 21 GLOFs occurred between 2008 and 2017 due to the drainage of Cachet 2 Lake into the Colonia River, a tributary of the Baker River. During these GLOFs, the increased discharge from the Colonia River blocks the regular flow of the Baker River, resulting in the inundation of the Valle Grande floodplain, which is located approximately 4 km upstream of the confluence. To assess the possible relationship between GLOF frequency and climate variability, four sediment cores collected in the Valle Grande floodplain were analyzed. Their geophysical and sedimentological properties were examined, and radiocarbon-based age-depth models were constructed. All cores consist of dense, fine-grained, organic-poor material alternating with low-density organic-rich deposits. The percentage of lithogenic particles, which were most likely deposited during high-magnitude GLOFs, was used to reconstruct the flood history of the last 2.75 kyr. Results show increased flood activity between 2.57 and 2.17 cal kyr BP, and between 0.75 and 0 cal kyr BP. These two periods coincide with Neoglacial advances that are coeval with periods of lower temperature and increased precipitation. Our results suggest that GLOFs are not a new phenomenon in the region. Although rapid glacier retreat is likely responsible for high GLOF frequency in the 21st century, high-magnitude GLOFs seem to occur more frequently when glaciers are larger and thicker. © 2020
英文关键词	Floodplain; GLOF; Loss-on-ignition; Neoglaciation; Paleofloods; Paleohydrology
语种	英语
scopus关键词	Banks (bodies of water); Climate change; Floods; Glacial geology; Lakes; Climate variability; Glacial lake outburst flood; Glacial lake outburst flood (GLOFs); Glacial lakes; Glacier retreat; Increased discharges; Lower temperatures; River watersheds; Rivers; core analysis; flood frequency; glacial lake; glacier retreat; Neoglacial; outburst; precipitation intensity; radiocarbon dating; river discharge; tributary; Colonia [Uruguay]; Patagonia; Uruguay
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/151289
作者单位	Renard Centre of Marine Geology (RCMG), Department of Geology, Ghent University, Belgium; School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom; Department of Earth Sciences, Montana State University, Bozeman, United States; Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Universidad Austral de Chile, Coyhaique, Chile; Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia; Centro EULA, Universidad de Concepción, Concepción, Chile
推荐引用方式 GB/T 7714	Vandekerkhove E.,Bertrand S.,Mauquoy D.,et al. Neoglacial increase in high-magnitude glacial lake outburst flood frequency; upper Baker River; Chilean Patagonia (47°S)[J],2020,248.
APA	Vandekerkhove E..,Bertrand S..,Mauquoy D..,McWethy D..,Reid B..,...&Torrejón F..(2020).Neoglacial increase in high-magnitude glacial lake outburst flood frequency; upper Baker River; Chilean Patagonia (47°S).Quaternary Science Reviews,248.
MLA	Vandekerkhove E.,et al."Neoglacial increase in high-magnitude glacial lake outburst flood frequency; upper Baker River; Chilean Patagonia (47°S)".Quaternary Science Reviews 248(2020).