Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet
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...
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Online Access: | http://hdl.handle.net/2115/34545 https://doi.org/10.3189/172756405781812510 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/34545 2023-05-15T13:29:11+02:00 Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet Greve, Ralf http://hdl.handle.net/2115/34545 https://doi.org/10.3189/172756405781812510 eng eng International Glaciological Society http://www.igsoc.org/ http://hdl.handle.net/2115/34545 Annals of Glaciology, 42: 424-432 http://dx.doi.org/10.3189/172756405781812510 © 2005 International Glaciological Society Greenland Ice sheet Modelling Basal temperature Geothermal heat flux 452 article fthokunivhus https://doi.org/10.3189/172756405781812510 2022-11-18T01:01:37Z 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. Article in Journal/Newspaper Annals of Glaciology Dye 3 Dye-3 Greenland GRIP ice core Ice Sheet Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Greenland Annals of Glaciology 42 424 432 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Greenland Ice sheet Modelling Basal temperature Geothermal heat flux 452 |
spellingShingle |
Greenland Ice sheet Modelling Basal temperature Geothermal heat flux 452 Greve, Ralf Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
topic_facet |
Greenland Ice sheet Modelling Basal temperature Geothermal heat flux 452 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Greve, Ralf |
author_facet |
Greve, Ralf |
author_sort |
Greve, Ralf |
title |
Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
title_short |
Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
title_full |
Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
title_fullStr |
Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
title_full_unstemmed |
Relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the Greenland ice sheet |
title_sort |
relation of measured basal temperatures and the spatial distribution of the geothermal heat flux for the greenland ice sheet |
publisher |
International Glaciological Society |
url |
http://hdl.handle.net/2115/34545 https://doi.org/10.3189/172756405781812510 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Dye 3 Dye-3 Greenland GRIP ice core Ice Sheet |
genre_facet |
Annals of Glaciology Dye 3 Dye-3 Greenland GRIP ice core Ice Sheet |
op_relation |
http://www.igsoc.org/ http://hdl.handle.net/2115/34545 Annals of Glaciology, 42: 424-432 http://dx.doi.org/10.3189/172756405781812510 |
op_rights |
© 2005 International Glaciological Society |
op_doi |
https://doi.org/10.3189/172756405781812510 |
container_title |
Annals of Glaciology |
container_volume |
42 |
container_start_page |
424 |
op_container_end_page |
432 |
_version_ |
1765999117494910976 |