气候变化领域集成服务门户(CCPortal): Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia

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DOI	10.1038/s41467-021-26578-0
	Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia
	Sugiyama S.; Minowa M.; Fukamachi Y.; Hata S.; Yamamoto Y.; Sauter T.; Schneider C.; Schaefer M.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Water temperature in glacial lakes affects underwater melting and calving of glaciers terminating in lakes. Despite its importance, seasonal lake temperature variations are poorly understood because taking long-term measurements near the front of calving glaciers is challenging. To investigate the thermal structure and its seasonal variations, we performed year-around temperature and current measurement at depths of 58–392 m in Lago Grey, a 410-m-deep glacial lake in Patagonia. The measurement revealed critical impacts of subglacial discharge on the lake thermal condition. Water below a depth of ~100 m showed the coldest temperature in mid-summer, under the influence of glacial discharge, whereas temperature in the upper layer followed a seasonal variation of air temperature. The boundary of the lower and upper layers was controlled by the depth of a sill which blocks outflow of dense and cold glacial meltwater. Our data implies that subglacial discharge and bathymetry dictate mass loss and the retreat of lake-terminating glaciers. The cold lakewater hinders underwater melting and facilitates formation of a floating terminus. © 2021, The Author(s).
语种	英语
scopus关键词	bathymetry; discharge; glacial lake; seasonal variation; subglacial environment; thermal structure; Patagonia
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251327
作者单位	Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Arctic Research Center, Hokkaido University, Sapporo, Japan; Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan; Institute of Geography, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Geography Department, Humboldt-Universität zu Berlin, Berlin, Germany; Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, Valdivia, Chile
推荐引用方式 GB/T 7714	Sugiyama S.,Minowa M.,Fukamachi Y.,et al. Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia[J],2021,12(1).
APA	Sugiyama S..,Minowa M..,Fukamachi Y..,Hata S..,Yamamoto Y..,...&Schaefer M..(2021).Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia.Nature Communications,12(1).
MLA	Sugiyama S.,et al."Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia".Nature Communications 12.1(2021).