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Basal conditions and ice dynamics inferred from radar-derived internal stratigraphy of the northeast Greenland ice stream

Citation

Keisling, BA and Christianson, K and Alley, RB and Peters, LE and Christian, JEM and Anandakrishnan, S and Riverman, KL and Muto, A and Jacobel, RW, Basal conditions and ice dynamics inferred from radar-derived internal stratigraphy of the northeast Greenland ice stream, Annals of Glaciology, 55, (67) pp. 127-137. ISSN 0260-3055 (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 International Glaciological Society

DOI: doi:10.3189/2014AoG67A090

Abstract

We analyze the internal stratigraphy in radio-echo sounding data of the northeast Greenland ice stream to infer past and present ice dynamics. In the upper reaches of the ice stream, we propose that shear-margin steady-state folds in internal reflecting horizons (IRHs) form due to the influence of ice flow over spatially varying basal lubrication. IRHs are generally lower in the ice stream than outside, likely because of greater basal melting in the ice stream from enhanced geothermal flux and heat of sliding. Strain-rate modeling of IRHs deposited during the Holocene indicates no recent major changes in ice-stream vigor or extent in this region. Downstream of our survey, IRHs are disrupted as the ice flows into a prominent overdeepening. When combined with additional data from other studies, these data suggest that upstream portions of the ice stream are controlled by variations in basal lubrication whereas downstream portions are confined by basal topography.

Item Details

Item Type:Refereed Article
Keywords:ice dynamics, radio glaciology
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
UTAS Author:Peters, LE (Dr Leo Peters)
ID Code:103753
Year Published:2014
Web of Science® Times Cited:11
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-27
Last Modified:2017-10-30
Downloads:261 View Download Statistics

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