nerc.ac.uk

Heat flux variations beneath central Greenland's ice due to anomalously thin lithosphere

Petrunin, A.; Rogozhina, I.; Vaughan, A.P.M.; Kukkonen, I.T.; Kaban, M.K.; Koulakov, I.; Thomas, M.. 2013 Heat flux variations beneath central Greenland's ice due to anomalously thin lithosphere. Nature Geoscience, 6. 746-750. 10.1038/NGEO1898

Before downloading, please read NORA policies.
[img] Text
10727_0_merged_1354207804 (3).pdf.pdf.pdf - Submitted Version
Restricted to NORA staff only

Download (7MB) | Request a copy

Abstract/Summary

At the Earth’s surface, heat fluxes from the interior1 are generally insignificant compared with those from the Sun and atmosphere2, except in areas permanently blanketed by ice. Modelling studies show that geothermal heat flux influences the internal thermal structure of ice sheets and the distribution of basal melt water3, and it should be taken into account in planning deep ice drilling campaigns and climate reconstructions4. Here we use a coupled ice–lithosphere model driven by climate and show that the oldest and thickest part of the Greenland Ice Sheet is strongly influenced by heat flow from the deep Earth. We find that the geothermal heat flux in central Greenland increases from west to east due to thinning of the lithosphere, which is only about 25–66% as thick as is typical for terrains of early Proterozoic age5. Complex interactions between geothermal heat flow and glaciation-induced thermal perturbations in the upper crust over glacial cycles lead to strong regional variations in basal ice conditions, with areas of rapid basal melting adjoining areas of extremely cold basal ice. Our findings demonstrate the role that the structure of the solid Earth plays in the dynamics of surface processes.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1038/NGEO1898
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Environmental Change and Evolution
ISSN: 1752-0894
Date made live: 13 Jul 2015 10:57 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/21028

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...