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Excess Heat in the Greenland Ice Sheet: Dissipation, Temperate Paleo-firn and Cryo-hydrologic Warming : Volume 8, Issue 5 (13/10/2014)

By Lüthi, M. P.

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Book Id: WPLBN0004023105
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Excess Heat in the Greenland Ice Sheet: Dissipation, Temperate Paleo-firn and Cryo-hydrologic Warming : Volume 8, Issue 5 (13/10/2014)  
Author: Lüthi, M. P.
Volume: Vol. 8, Issue 5
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Catania, G. A., Andrews, L. C., Ryser, C., Hawley, R. L., Hoffman, M. J., Lüthi, M. P.,...Neumann, T. A. (2014). Excess Heat in the Greenland Ice Sheet: Dissipation, Temperate Paleo-firn and Cryo-hydrologic Warming : Volume 8, Issue 5 (13/10/2014). Retrieved from

Description: Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie (VAW), ETH Zurich, 8093 Zurich, Switzerland. Ice temperature profiles from the Greenland Ice Sheet contain information on the deformation history, past climates and recent warming. We present full-depth temperature profiles from two drill sites on a flowline passing through Swiss Camp, West Greenland. Numerical modeling reveals that ice temperatures are considerably higher than would be expected from heat diffusion and dissipation alone. The possible causes for this excess heat are evaluated using a Lagrangian heat flow model. The model results reveal that the observations can be explained with a combination of different processes: enhanced dissipation (strain heating) in ice-age ice, temperate paleo-firn, and cryo-hydrologic warming in deep crevasses.

Excess heat in the Greenland Ice Sheet: dissipation, temperate paleo-firn and cryo-hydrologic warming

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