Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet
Article first published online: 21 JUN 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 12, June 2007
How to Cite
2007), Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet, Geophys. Res. Lett., 34, L12501, doi:10.1029/2007GL030046., , , , and (
- Issue published online: 21 JUN 2007
- Article first published online: 21 JUN 2007
- Manuscript Accepted: 23 MAY 2007
- Manuscript Revised: 4 MAY 2007
- Manuscript Received: 15 MAR 2007
- geothermal heat;
 Many of the outlet glaciers in Greenland overlie deep and narrow trenches cut into the bedrock. It is well known that pronounced topography intensifies the geothermal heat flux in deep valleys and attenuates this flux on mountains. Here we investigate the magnitude of this effect for two subglacial trenches in Greenland. Heat flux variations are estimated for idealized geometries using solutions for plane slopes derived by Lachenbruch (1968). It is found that for channels such as the one under Jakobshavn Isbræ, topographic effects may increase the local geothermal heat flux by as much as 100%.