Physics – Geophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510501h&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 10, CiteID L10501
Physics
Geophysics
2
Cryosphere: Glaciology (1621, 1827, 1863), Cryosphere: Dynamics, Cryosphere: Ice Streams, Cryosphere: Tundra (9315), Exploration Geophysics: Seismic Methods (3025, 7294)
Scientific paper
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.
Alley Richard B.
Anandakrishnan Sridhar
Horgan H. J.
Peters L. E.
Tsoflias Georgios P.
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