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Complex fabric development revealed by englacial seismic reflectivity: Jakobshavn Isbræ, Greenland

Citation

Horgan, HJ and Anandakrishnan, S and Alley, RB and Peters, LE and Tsoflias, GP and Voigt, DE and Winberry, JP, Complex fabric development revealed by englacial seismic reflectivity: Jakobshavn Isbra, Greenland, Geophysical Research Letters, 35 Article L10501. ISSN 0094-8276 (2008) [Refereed Article]


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Copyright Statement

Copyright 2008 The American Geophysical Union

DOI: doi:10.1029/2008GL033712

Abstract

High-resolution reflection seismic data from Jakobshavn Isbræ, Greenland, reveal complex fabric development. Abundant englacial reflectivity occurs for approximately half the thickness of the ice (the lower half), and disruption of the englacial reflectors occurs in the lower 10–15% of the ice-thickness. These depths correspond to the higher impurity-content, and more easily deformed, ice from the Younger Dryas and Last Glacial Maximum to Stage-3. We conclude that the reflectivity results from contrasting seismic velocities due to changes in the crystal orientation fabric of the ice, and suggest that these fabric changes are caused by variations in impurity loading and subsequent deformation history. These findings emphasize the difference between ice-divide and ice-stream crystal orientation fabrics and have implications for predictive ice sheet modeling.

Item Details

Item Type:Refereed Article
Keywords:englacial structure, crystal orientation fabric, seismology
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:103896
Year Published:2008
Web of Science® Times Cited:27
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-28
Last Modified:2015-11-17
Downloads:659 View Download Statistics

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