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Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet

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Title: Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet
Authors: Greve, Ralf Browse this author →KAKEN DB
Keywords: Greenland
Ice sheet
Modelling
Basal temperature
Geothermal heat flux
Issue Date: Aug-2005
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 42
Start Page: 424
End Page: 432
Publisher DOI: 10.3189/172756405781812510
Abstract: The thermomechanical, three-dimensional ice-sheet model SICOPOLIS is applied to the Greenland ice sheet. Simulations over two glacial–interglacial cycles are carried out, driven by a climatic forcing interpolated between present conditions and Last Glacial Maximum anomalies. Based on the global heat-flow representation by Pollack and others (1993), we attempt to constrain the spatial pattern of the geothermal heat flux by comparing simulation results to direct measurements of basal temperatures at the GRIP, NorthGRIP, Camp Century and Dye 3 ice-core locations. The obtained heatflux map shows an increasing trend from west to east, a high-heat-flux anomaly around NorthGRIP with values up to 135mWm–2 and a low-heat-flux anomaly around Dye 3 with values down to 20mWm–2. Validation is provided by the generally good fit between observed and measured ice thicknesses. Residual discrepancies are most likely due to deficiencies of the input precipitation rate and further variability of the geothermal heat flux not captured here.
Rights: © 2005 International Glaciological Society
Relation: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/34545
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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