Professor Stewart Jamieson stewart.jamieson@durham.ac.uk
Professor
Subglacial processes on an Antarctic ice stream bed. 2: Can modelled ice dynamics explain the morphology of mega-scale glacial lineations?
Jamieson, S.S.R.; Stokes, C.R.; Livingstone, S.J.; Vieli, A.; Ò Cofaigh, C.; Hillenbrand, C-D.; Spagnolo, M.
Authors
Professor Chris Stokes c.r.stokes@durham.ac.uk
Professor
S.J. Livingstone
A. Vieli
Professor Colm O'Cofaigh colm.ocofaigh@durham.ac.uk
Professor
C-D. Hillenbrand
M. Spagnolo
Abstract
Mega-scale glacial lineations (MSGLs) are highly elongate subglacial bedforms associated with ice streaming. However, the link between MSGLs and rapid ice flow is largely qualitative, and there have been few attempts to quantitatively link their formation to ice flow characteristics (e.g. ice velocity, thickness, basal shear stress). We take measurements of MSGLs from a palaeo-ice stream that once occupied Marguerite Trough, Antarctic Peninsula and explore a range of possible correlations with ice dynamics generated from an ensemble of numerical modelling experiments that reproduce the deglaciation of the ice stream. Our results confirm that high mean ice velocities and a weak bed correlate with longer MSGLs. Furthermore, the height of MSGLs are low (2–3 m) where modelled basal shear stress is low, but their height tends to be higher and more variable where basal shear stress is larger. The mean density of MSGLs decreases as ice flux increases. Our analysis further suggests that the length of MSGLs is a function of basal ice velocity and time. Although our data/model correlations confirm the importance of ice velocity in MSGL formation, a significant challenge remains if we are to employ MSGLs as a quantifiable measure of past ice stream velocity.
Citation
Jamieson, S., Stokes, C., Livingstone, S., Vieli, A., Ò Cofaigh, C., Hillenbrand, C., & Spagnolo, M. (2016). Subglacial processes on an Antarctic ice stream bed. 2: Can modelled ice dynamics explain the morphology of mega-scale glacial lineations?. Journal of Glaciology, 62(232), 285-298. https://doi.org/10.1017/jog.2016.19
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 6, 2015 |
Online Publication Date | Mar 14, 2016 |
Publication Date | Apr 1, 2016 |
Deposit Date | Sep 18, 2015 |
Publicly Available Date | Mar 17, 2016 |
Journal | Journal of Glaciology |
Print ISSN | 0022-1430 |
Electronic ISSN | 1727-5652 |
Publisher | International Glaciological Society |
Peer Reviewed | Peer Reviewed |
Volume | 62 |
Issue | 232 |
Pages | 285-298 |
DOI | https://doi.org/10.1017/jog.2016.19 |
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http://creativecommons.org/licenses/by/4.0/
Copyright Statement
Advance online version Copyright © The Author(s) 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Published Journal Article (Final published version)
(1.5 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
Final published version
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