Late Holocene ice-flow reconfiguration in the Weddell Sea sector of West Antarctica

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Title: Late Holocene ice-flow reconfiguration in the Weddell Sea sector of West Antarctica
Authors: Siegert, M
Ross, N
Corr, H
Kingslake, J
Hindmarsh, R
Item Type: Journal Article
Abstract: Here we report Late Holocene ice sheet and grounding-line changes to the Weddell Sea sector of West Antarctica. Internal radio-echo layering within the Bungenstock Ice Rise, which comprises very slow-flowing ice separating the fast-flowing Institute and Möller ice streams, reveals ice deformed by former enhanced flow, overlain by un-deformed ice. The ice-rise surface is traversed by surface lineations explicable as diffuse ice-flow generated stripes, which thus capture the direction of flow immediately prior to the creation of the ice rise. The arrangement of internal layers can be explained by adjustment to the flow path of the Institute Ice Stream, during either a phase of ice sheet retreat not longer than ∼4000 years ago or by wholesale expansion of the grounding-line from an already retreated situation not sooner than ∼400 years ago. Some combination of these events, involving uplift of the ice rise bed during ice stream retreat and reorganisation, is also possible. Whichever the case, the implication is that the ice sheet upstream of the Bungenstock Ice Rise, which currently grounds over a >1.5 km deep basin has been, and therefore may be, susceptible to significant change.
Issue Date: 15-Oct-2013
Date of Acceptance: 9-Aug-2013
URI: http://hdl.handle.net/10044/1/72488
DOI: https://doi.org/10.1016/j.quascirev.2013.08.003
ISSN: 0277-3791
Publisher: Elsevier
Start Page: 98
End Page: 107
Journal / Book Title: Quaternary Science Reviews
Volume: 78
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
British Council (UK)
Funder's Grant Number: NE/G00465X/3
GEOG.RE2356
ICECAP-2
Keywords: Science & Technology
Physical Sciences
Geography, Physical
Geosciences, Multidisciplinary
Physical Geography
Geology
Marine ice sheet
Internal layers
Ice rise
Ice sheet stability
GROUNDING-LINE RETREAT
LAST GLACIAL MAXIMUM
RONNE ICE
STREAM-C
SHEET
RADAR
SHELF
STABILITY
EMBAYMENT
CONSTRAINTS
Science & Technology
Physical Sciences
Geography, Physical
Geosciences, Multidisciplinary
Physical Geography
Geology
Marine ice sheet
Internal layers
Ice rise
Ice sheet stability
GROUNDING-LINE RETREAT
LAST GLACIAL MAXIMUM
RONNE ICE
STREAM-C
SHEET
RADAR
SHELF
STABILITY
EMBAYMENT
CONSTRAINTS
04 Earth Sciences
21 History and Archaeology
Paleontology
Publication Status: Published
Online Publication Date: 2013-09-03
Appears in Collections:Centre for Environmental Policy



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