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Thermal structure of proglacial lakes in Patagonia

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Title: Thermal structure of proglacial lakes in Patagonia
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Minowa, Masahiro Browse this author
Sakakibara, Daiki Browse this author
Skvarca, Pedro Browse this author
Sawagaki, Takanobu Browse this author →KAKEN DB
Ohashi, Yoshihiko Browse this author
Naito, Nozomu Browse this author
Chikita, Kazuhisa Browse this author →KAKEN DB
Issue Date: Dec-2016
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research earth surface
Volume: 121
Issue: 12
Start Page: 2270
End Page: 2286
Publisher DOI: 10.1002/2016JF004084
Abstract: Calving glaciers are rapidly retreating in many regions under the influence of ice-water interactions at the glacier front. In contrast to the numerous researches conducted on fjords in front of tidewater glaciers, very few studies have been reported on lakes in which freshwater calving glaciers terminate. To better understand ice-water interactions at the front of freshwater calving glaciers, we measured lakewater temperature, turbidity, and bathymetry near Glaciar Perito Moreno, Upsala, and Viedma, large calving glaciers of the Southern Patagonia Icefield. The thermal structures of these lakes were significantly different from those reported in glacial fjords. There was no indication of upwelling subglacial meltwater; instead, turbid and cold glacial water discharge filled the region near the lake bottom. This was because water density was controlled by suspended sediment concentrations rather than by water temperature. Near-surface wind-driven circulation reaches a depth of similar to 180 m, forming a relatively warm isothermal layer (mean temperature of similar to 5-6 degrees C at Perito Moreno, similar to 3-4 degrees C at Upsala, and similar to 6-7 degrees C at Viedma), which should convey heat energy to the ice-water interface. However, the deeper part of the glacier front is in contact with stratified cold water, implying a limited amount of melting there. In the lake in front of Glaciar Viedma, the region deeper than 120 m was filled entirely with turbid and very cold water at pressure melting temperature. Our results revealed a previously unexplored thermal structure of proglacial lakes in Patagonia, suggesting its importance in the subaqueous melting of freshwater calving glaciers.
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)

Submitter: 杉山 慎

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