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Englacial architecture and age‐depth constraints across the West Antarctic Ice Sheet

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Title: Englacial architecture and age‐depth constraints across the West Antarctic Ice Sheet
Authors: Ashmore, DW
Bingham, RG
Ross, N
Siegert, MJ
Jordan, TA
Mair, DWF
Item Type: Journal Article
Abstract: The englacial stratigraphic architecture of internal‐reflection horizons (IRHs) as imaged by ice‐penetrating radar (IPR) across ice sheets reflects the cumulative effects of surface mass balance, basal melt and ice flow. IRHs, considered isochrones, have typically been traced in interior, slow‐flowing regions. Here, we identify three distinctive IRHs spanning the Institute and Möller catchments that cover 50% of West Antarctica's Weddell Sea Sector and are characterised by a complex system of ice‐stream tributaries. We place age constraints on IRHs through their intersections with previous geophysical surveys tied to Byrd Ice Core, and by age‐depth modeling. We further show where the oldest ice likely exists within the region; and that Holocene ice‐dynamic changes were limited to the catchment's lower reaches. The traced IRHs from this study have clear potential to nucleate a wider continental‐scale IRH database for validating ice‐sheet models.
Issue Date: 28-Mar-2020
Date of Acceptance: 27-Feb-2020
URI: http://hdl.handle.net/10044/1/77245
DOI: 10.1029/2019gl086663
ISSN: 0094-8276
Publisher: American Geophysical Union (AGU)
Start Page: 1
End Page: 11
Journal / Book Title: Geophysical Research Letters
Volume: 47
Issue: 6
Copyright Statement: © 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/G00465X/3
Keywords: Meteorology & Atmospheric Sciences
Publication Status: Published
Online Publication Date: 2020-03-02
Appears in Collections:Faculty of Engineering
Earth Science and Engineering
Faculty of Natural Sciences
Grantham Institute for Climate Change