Uppermost crustal structure regulates the flow of the Greenland Ice Sheet

Jones, Glenn; G., A. M.; Kulessa, Bernd; Schimmel, M.; Berbellini, A.; Morelli, A.

doi:10.1038/s41467-021-27537-5

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Uppermost crustal structure regulates the flow of the Greenland Ice Sheet

Glenn Jones, A. M. G. Ferreira, Bernd Kulessa

, M. Schimmel, A. Berbellini, A. Morelli

Nature Communications, Volume: 12, Issue: 1

Swansea University Authors: Glenn Jones, Bernd Kulessa

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DOI (Published version): 10.1038/s41467-021-27537-5

Abstract

The flow of the Greenland Ice Sheet is controlled by subglacial processes and conditions that depend on the geological provenance and temperature of the crust beneath it, neither of which are adequately known. Here we present a seismic velocity model of the uppermost 5 km of the Greenlandic crust. W...

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Published in:	Nature Communications
ISSN:	2041-1723
Published:	Springer Science and Business Media LLC 2021
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URI:	https://cronfa.swan.ac.uk/Record/cronfa59026
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spelling	2022-12-14T09:43:48.1583896 v2 59026 2021-12-20 Uppermost crustal structure regulates the flow of the Greenland Ice Sheet 7f3ed841381af3c71e3be0dda5e0543a Glenn Jones Glenn Jones true false 52acda616e9f6073cbebf497def874c9 0000-0002-4830-4949 Bernd Kulessa Bernd Kulessa true false 2021-12-20 The flow of the Greenland Ice Sheet is controlled by subglacial processes and conditions that depend on the geological provenance and temperature of the crust beneath it, neither of which are adequately known. Here we present a seismic velocity model of the uppermost 5 km of the Greenlandic crust. We show that slow velocities in the upper crust tend to be associated with major outlet glaciers along the ice-sheet margin, and elevated geothermal heat flux along the Iceland hotspot track inland. Outlet glaciers particularly susceptible to basal slip over deformable subglacial sediments include Jakobshavn, Helheim and Kangerdlussuaq, while geothermal warming and softening of basal ice may affect the onset of faster ice flow at Petermann Glacier and the Northeast Greenland Ice Stream. Interactions with the solid earth therefore control the past, present and future dynamics of the Greenland Ice Sheet and must be adequately explored and implemented in ice sheet models. Journal Article Nature Communications 12 1 Springer Science and Business Media LLC 2041-1723 15 12 2021 2021-12-15 10.1038/s41467-021-27537-5 COLLEGE NANME COLLEGE CODE Swansea University Another institution paid the OA fee G.A.J. is funded through the by the Seȓ Cymru II Program in Low Carbon Energy and the Environment (European Regional Development Fund and Welsh European Funding Office; Project number 80761-SU-SU093). A.M.G.F. is grateful to support from NERC grant NE/N011791/1. M.S. thanks SANIMS (RTI2018-095594-B-I00). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 101001601). 2022-12-14T09:43:48.1583896 2021-12-20T06:49:23.6640987 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Glenn Jones 1 A. M. G. Ferreira 2 Bernd Kulessa 0000-0002-4830-4949 3 M. Schimmel 4 A. Berbellini 5 A. Morelli 6 59026__21911__18f0706aa2fb4d3aa7bf7ab715df7f2a.pdf Jones et al 2021 Greenland_Geology_Paper_NatComms_Published.pdf 2021-12-20T06:53:05.8355743 Output 5860320 application/pdf Version of Record true © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License true eng http://creativecommons.org/licenses/by/4.0/
title	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
spellingShingle	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet Glenn Jones Bernd Kulessa
title_short	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
title_full	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
title_fullStr	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
title_full_unstemmed	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
title_sort	Uppermost crustal structure regulates the flow of the Greenland Ice Sheet
author_id_str_mv	7f3ed841381af3c71e3be0dda5e0543a 52acda616e9f6073cbebf497def874c9
author_id_fullname_str_mv	7f3ed841381af3c71e3be0dda5e0543a_*_Glenn Jones 52acda616e9f6073cbebf497def874c9_*_Bernd Kulessa
author	Glenn Jones Bernd Kulessa
author2	Glenn Jones A. M. G. Ferreira Bernd Kulessa M. Schimmel A. Berbellini A. Morelli
format	Journal article
container_title	Nature Communications
container_volume	12
container_issue	1
publishDate	2021
institution	Swansea University
issn	2041-1723
doi_str_mv	10.1038/s41467-021-27537-5
publisher	Springer Science and Business Media LLC
college_str	Faculty of Science and Engineering
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description	The flow of the Greenland Ice Sheet is controlled by subglacial processes and conditions that depend on the geological provenance and temperature of the crust beneath it, neither of which are adequately known. Here we present a seismic velocity model of the uppermost 5 km of the Greenlandic crust. We show that slow velocities in the upper crust tend to be associated with major outlet glaciers along the ice-sheet margin, and elevated geothermal heat flux along the Iceland hotspot track inland. Outlet glaciers particularly susceptible to basal slip over deformable subglacial sediments include Jakobshavn, Helheim and Kangerdlussuaq, while geothermal warming and softening of basal ice may affect the onset of faster ice flow at Petermann Glacier and the Northeast Greenland Ice Stream. Interactions with the solid earth therefore control the past, present and future dynamics of the Greenland Ice Sheet and must be adequately explored and implemented in ice sheet models.
published_date	2021-12-15T04:16:00Z
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score	11.012678

Uppermost crustal structure regulates the flow of the Greenland Ice Sheet

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