A deep subglacial embayment adjacent to the grounding line of Institute Ice Stream, West Antarctica

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Title: A deep subglacial embayment adjacent to the grounding line of Institute Ice Stream, West Antarctica
Authors: Jeofry, H
Ross, N
Corr, H
Li, J
Gogineni, P
Siegert, MJ
Item Type: Journal Article
Abstract: The Institute Ice Stream (IIS) in West Antarctica may be increasingly vulnerable to melting at the grounding line through modifications in ocean circulation. Understanding such change requires knowledge of grounding-line boundary conditions, including the topography on which it rests. Here, we discuss evidence from new radio-echo sounding (RES) data on the subglacial topography adjacent to the grounding line of the IIS. In doing so, we reveal a previously unknown subglacial embayment immediately inland of the IIS grounding zone which is not represented in the Bedmap2 compilation. We discuss whether there is an open-water connection between the embayment and the ice-shelf cavity. The exact location of the grounding line over the embayment has been the subject of considerable uncertainty, with several positions being proposed recently. From our compilation of data, we are able to explain which of these grounding lines is most likely and, in doing so, highlight the need for accurate bed topography in conjunction with satellite observations to fully comprehend ice-sheet processes in this region and other vulnerable locations at the grounded margin of Antarctica.
Issue Date: 13-Jun-2017
Date of Acceptance: 12-Apr-2017
ISSN: 0305-8719
Publisher: Geological Society of London
Journal / Book Title: Special Publication - Geological Society of London
Volume: Special Publications 461
Copyright Statement: © 2018 The Author(s). Published by The Geological Society of London Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.
Sponsor/Funder: Natural Environment Research Council (NERC)
British Council (UK)
Funder's Grant Number: NE/G00465X/3
Keywords: 04 Earth Sciences
Geochemistry & Geophysics
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences

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