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Active water exchange and life near the grounding line of an Antarctic outlet glacier

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Title: Active water exchange and life near the grounding line of an Antarctic outlet glacier
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Sawagaki, Takanobu Browse this author →KAKEN DB
Fukuda, Takehiro Browse this author
Aoki, Shigeru Browse this author →KAKEN DB
Keywords: Antarctica
grounding line
basal melting
hot water drilling
outlet glacier
ice-ocean interaction
Issue Date: 1-Aug-2014
Publisher: Elsevier
Journal Title: Earth and Planetary Science Letters
Volume: 399
Start Page: 52
End Page: 60
Publisher DOI: 10.1016/j.epsl.2014.05.001
Abstract: The grounding line (GL) of the Antarctic ice sheet forms the boundary between grounded and floating ice along the coast. Near this line, warm oceanic water contacts the ice shelf, producing the ice sheet's highest basal-melt rate. Despite the importance of this region, water properties and circulations near the GL are largely unexplored because in-situ observations are difficult. Here we present direct evidence of warm ocean-water transport to the innermost part of the subshelf cavity (several hundred meters seaward from the GL) of Langhovde Glacier, an outlet glacier in East Antarctica. Our measurements come from boreholes drilled through the glacier's similar to 400-m-thick grounding zone. Beneath the grounding zone, we find a 10-24-m-deep water layer of uniform temperature and salinity (-1.45 degrees C; 34.25 PSU), values that roughly equal those measured in the ocean in front of the glacier. Moreover, living organisms are found in the thin subglacial water layer. These findings indicate active transport of water and nutrients from the adjacent ocean, meaning that the subshelf environment interacts directly and rapidly with the ocean. (C) 2014 The Authors. Published by Elsevier B.V.
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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