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High Geothermal Heat Flow, Basal Melt, and the Origin of Rapid Ice Flow in Central Greenland
Mark Fahnestock,1Waleed Abdalati,2Ian Joughin,3John Brozena,4Prasad Gogineni5
Age-depth relations from internal layering reveal a
large region of rapid basal melting in Greenland. Melt is localized atthe onset of rapid ice flow in the large ice stream that drainsnorth
off the summit dome and other areas in the northeast quadrantof the
ice sheet. Locally, high melt rates indicate geothermalfluxes 15 to 30 times continental background. The southern limitof melt coincides with
magnetic anomalies and topography thatsuggest a volcanic origin.
1 Earth System Science Interdisciplinary
Center, University of Maryland, College Park, MD 20742, USA.
2 NASA Headquarters, Washington, DC 20546, USA.
3 Jet Propulsion Laboratory, Mail Stop 300-235, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
4 Naval
Research Laboratory, Washington, DC 20375, USA.
5 Remote Sensing Laboratory, University of Kansas,
Lawrence, KS 66045, USA.
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