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Title: Heat sources within the Greenland Ice Sheet: dissipation, temperate paleo-firn and cryo-hydrologic warming

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 flow line 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 extra 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.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. ETH Zurich (Switzerland). Versuchsanstalt fuer Wasserbau, Hydrologie und Glaziologie (VAW)
  2. Univ. of Texas, Austin, TX (United States). Inst. for Geophysics and Dept. of Geological Sciences
  3. Dartmouth College, Hanover, NH (United States). Dept. of Earth Sciences
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Fluid Dynamics and Solid Mechanics Group
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
OSTI Identifier:
1208896
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
The Cryosphere (Online)
Additional Journal Information:
Journal Name: The Cryosphere (Online); Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 1994-0424
Publisher:
European Geosciences Union
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES