論文

査読有り
2014年8月1日

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

Earth and Planetary Science Letters
  • Sugiyama Shin
  • ,
  • Sawagaki Takanobu
  • ,
  • Fukuda Takehiro
  • ,
  • Aoki Shigeru

399
399
開始ページ
52
終了ページ
60
記述言語
英語
掲載種別
DOI
10.1016/j.epsl.2014.05.001
出版者・発行元
Elsevier

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.

リンク情報
DOI
https://doi.org/10.1016/j.epsl.2014.05.001
CiNii Articles
http://ci.nii.ac.jp/naid/120005476086
URL
http://hdl.handle.net/2115/57003
ID情報
  • DOI : 10.1016/j.epsl.2014.05.001
  • ISSN : 0012-821X
  • CiNii Articles ID : 120005476086

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