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Title
  • en Active water exchange and life near the grounding line of an Antarctic outlet glacier
Creator
Accessrights open access
Rights
Subject
  • Other en Antarctica
  • Other en grounding line
  • Other en basal melting
  • Other en hot water drilling
  • Other en outlet glacier
  • Other en ice-ocean interaction
  • NDC 450
Description
  • Abstract en 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.
Publisher en Elsevier
Date
    Issued2014-08-01
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/57003
Relation
  • isIdenticalTo DOI https://doi.org/10.1016/j.epsl.2014.05.001
Journal
    • PISSN 0012-821X
      • en Earth and Planetary Science Letters
      • Volume Number399 Page Start52 Page End60
File
Oaidate 2023-07-26