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Subglacial discharge controls seasonal variations in the thermal structure of a glacial lake in Patagonia
| 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 |
| URI: | http://hdl.handle.net/2115/83446 |
| 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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