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Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia

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Title: Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Minowa, Masahiro Browse this author
Fukamachi, Yasushi Browse this author →KAKEN DB
Hata, Shuntaro Browse this author
Yamamoto, Yoshihiro Browse this author
Sauter, Tobias Browse this author
Schneider, Christoph Browse this author
Schaefer, Marius Browse this author
Issue Date: 2-Nov-2021
Publisher: Nature Portfolio
Journal Title: Nature communications
Volume: 12
Issue: 1
Start Page: 6301
Publisher DOI: 10.1038/s41467-021-26578-0
Abstract: 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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