No Cover Image

Journal article 468 views 50 downloads

Highly variable friction and slip observed at Antarctic ice stream bed

T. S. Hudson Orcid Logo, S. K. Kufner Orcid Logo, A. M. Brisbourne Orcid Logo, J. M. Kendall Orcid Logo, A. M. Smith Orcid Logo, R. B. Alley Orcid Logo, R. J. Arthern, Tavi Murray Orcid Logo

Nature Geoscience

Swansea University Author: Tavi Murray Orcid Logo

  • 63652.pdf

    PDF | Version of Record

    Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

    Download (5.08MB)

Check full text

DOI (Published version): 10.1038/s41561-023-01204-4

Abstract

The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic ob...

Full description

Published in: Nature Geoscience
ISSN: 1752-0894 1752-0908
Published: Springer Science and Business Media LLC 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa63652
Tags: Add Tag
No Tags, Be the first to tag this record!
first_indexed 2023-06-16T08:50:32Z
last_indexed 2023-06-16T08:50:32Z
id cronfa63652
recordtype SURis
fullrecord <?xml version="1.0" encoding="utf-8"?><rfc1807 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><bib-version>v2</bib-version><id>63652</id><entry>2023-06-16</entry><title>Highly variable friction and slip observed at Antarctic ice stream bed</title><swanseaauthors><author><sid>8d6e71df690e725cd44191006dac31da</sid><ORCID>0000-0001-6714-6512</ORCID><firstname>Tavi</firstname><surname>Murray</surname><name>Tavi Murray</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2023-06-16</date><deptcode>SGE</deptcode><abstract>The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations to measure both frictional shear stress and slip at the bed of the Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal shear stresses and slip rates vary from 104 to 107 Pa and 0.2 to 1.5 m per day, respectively. Friction and slip vary temporally over the order of hours, and spatially over 10s of metres, due to corresponding variations in effective normal stress and ice–bed interface material. Our findings suggest that the bed is substantially more complex than currently assumed in ice stream models and that basal effective normal stresses may be significantly higher than previously thought. Our observations can provide constraints on the basal boundary conditions for ice-dynamics models. This is critical for constraining the primary contribution of ice mass loss in Antarctica and hence for reducing uncertainty in sea-level rise projections.</abstract><type>Journal Article</type><journal>Nature Geoscience</journal><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher>Springer Science and Business Media LLC</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>1752-0894</issnPrint><issnElectronic>1752-0908</issnElectronic><keywords>Climate Change, Cryospheric Science, Seismology</keywords><publishedDay>15</publishedDay><publishedMonth>6</publishedMonth><publishedYear>2023</publishedYear><publishedDate>2023-06-15</publishedDate><doi>10.1038/s41561-023-01204-4</doi><url>http://dx.doi.org/10.1038/s41561-023-01204-4</url><notes/><college>COLLEGE NANME</college><department>Geography</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>SGE</DepartmentCode><institution>Swansea University</institution><apcterm>Another institution paid the OA fee</apcterm><funders>T.S.H., A.M.B., A.M.S. and T.M. were funded by Natural Environment Research Council grants NE/G014159/1 and NE/G013187/1. Seismic instruments were provided by NERC SEIS-UK (loans 1017 and 1111), by BAS and by the Incorporated Research Institutions for Seismology (IRIS) through the Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center at New Mexico Tech. The facilities of the IRIS Consortium are supported by the National Science Foundation’s Seismological Facilities for the Advancement of Geoscience (SAGE) award under cooperative support agreement EAR-1851048.</funders><projectreference/><lastEdited>2023-06-21T13:23:12.2033322</lastEdited><Created>2023-06-16T09:43:45.9045105</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Geography</level></path><authors><author><firstname>T. S.</firstname><surname>Hudson</surname><orcid>0000-0003-2944-883x</orcid><order>1</order></author><author><firstname>S. K.</firstname><surname>Kufner</surname><orcid>0000-0002-9687-5455</orcid><order>2</order></author><author><firstname>A. M.</firstname><surname>Brisbourne</surname><orcid>0000-0002-9887-7120</orcid><order>3</order></author><author><firstname>J. M.</firstname><surname>Kendall</surname><orcid>0000-0002-1486-3945</orcid><order>4</order></author><author><firstname>A. M.</firstname><surname>Smith</surname><orcid>0000-0001-8577-482x</orcid><order>5</order></author><author><firstname>R. B.</firstname><surname>Alley</surname><orcid>0000-0003-1833-0115</orcid><order>6</order></author><author><firstname>R. J.</firstname><surname>Arthern</surname><order>7</order></author><author><firstname>Tavi</firstname><surname>Murray</surname><orcid>0000-0001-6714-6512</orcid><order>8</order></author></authors><documents><document><filename>63652__27906__6241e78f733e454388676251b28fad15.pdf</filename><originalFilename>63652.pdf</originalFilename><uploaded>2023-06-21T10:56:07.1174212</uploaded><type>Output</type><contentLength>5326040</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><documentNotes>Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language><licence>http://creativecommons.org/licenses/by/4.0/</licence></document></documents><OutputDurs/></rfc1807>
spelling v2 63652 2023-06-16 Highly variable friction and slip observed at Antarctic ice stream bed 8d6e71df690e725cd44191006dac31da 0000-0001-6714-6512 Tavi Murray Tavi Murray true false 2023-06-16 SGE The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations to measure both frictional shear stress and slip at the bed of the Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal shear stresses and slip rates vary from 104 to 107 Pa and 0.2 to 1.5 m per day, respectively. Friction and slip vary temporally over the order of hours, and spatially over 10s of metres, due to corresponding variations in effective normal stress and ice–bed interface material. Our findings suggest that the bed is substantially more complex than currently assumed in ice stream models and that basal effective normal stresses may be significantly higher than previously thought. Our observations can provide constraints on the basal boundary conditions for ice-dynamics models. This is critical for constraining the primary contribution of ice mass loss in Antarctica and hence for reducing uncertainty in sea-level rise projections. Journal Article Nature Geoscience Springer Science and Business Media LLC 1752-0894 1752-0908 Climate Change, Cryospheric Science, Seismology 15 6 2023 2023-06-15 10.1038/s41561-023-01204-4 http://dx.doi.org/10.1038/s41561-023-01204-4 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University Another institution paid the OA fee T.S.H., A.M.B., A.M.S. and T.M. were funded by Natural Environment Research Council grants NE/G014159/1 and NE/G013187/1. Seismic instruments were provided by NERC SEIS-UK (loans 1017 and 1111), by BAS and by the Incorporated Research Institutions for Seismology (IRIS) through the Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center at New Mexico Tech. The facilities of the IRIS Consortium are supported by the National Science Foundation’s Seismological Facilities for the Advancement of Geoscience (SAGE) award under cooperative support agreement EAR-1851048. 2023-06-21T13:23:12.2033322 2023-06-16T09:43:45.9045105 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography T. S. Hudson 0000-0003-2944-883x 1 S. K. Kufner 0000-0002-9687-5455 2 A. M. Brisbourne 0000-0002-9887-7120 3 J. M. Kendall 0000-0002-1486-3945 4 A. M. Smith 0000-0001-8577-482x 5 R. B. Alley 0000-0003-1833-0115 6 R. J. Arthern 7 Tavi Murray 0000-0001-6714-6512 8 63652__27906__6241e78f733e454388676251b28fad15.pdf 63652.pdf 2023-06-21T10:56:07.1174212 Output 5326040 application/pdf Version of Record true Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. true eng http://creativecommons.org/licenses/by/4.0/
title Highly variable friction and slip observed at Antarctic ice stream bed
spellingShingle Highly variable friction and slip observed at Antarctic ice stream bed
Tavi Murray
title_short Highly variable friction and slip observed at Antarctic ice stream bed
title_full Highly variable friction and slip observed at Antarctic ice stream bed
title_fullStr Highly variable friction and slip observed at Antarctic ice stream bed
title_full_unstemmed Highly variable friction and slip observed at Antarctic ice stream bed
title_sort Highly variable friction and slip observed at Antarctic ice stream bed
author_id_str_mv 8d6e71df690e725cd44191006dac31da
author_id_fullname_str_mv 8d6e71df690e725cd44191006dac31da_***_Tavi Murray
author Tavi Murray
author2 T. S. Hudson
S. K. Kufner
A. M. Brisbourne
J. M. Kendall
A. M. Smith
R. B. Alley
R. J. Arthern
Tavi Murray
format Journal article
container_title Nature Geoscience
publishDate 2023
institution Swansea University
issn 1752-0894
1752-0908
doi_str_mv 10.1038/s41561-023-01204-4
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
url http://dx.doi.org/10.1038/s41561-023-01204-4
document_store_str 1
active_str 0
description The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations to measure both frictional shear stress and slip at the bed of the Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal shear stresses and slip rates vary from 104 to 107 Pa and 0.2 to 1.5 m per day, respectively. Friction and slip vary temporally over the order of hours, and spatially over 10s of metres, due to corresponding variations in effective normal stress and ice–bed interface material. Our findings suggest that the bed is substantially more complex than currently assumed in ice stream models and that basal effective normal stresses may be significantly higher than previously thought. Our observations can provide constraints on the basal boundary conditions for ice-dynamics models. This is critical for constraining the primary contribution of ice mass loss in Antarctica and hence for reducing uncertainty in sea-level rise projections.
published_date 2023-06-15T13:23:10Z
_version_ 1769314913667252224
score 11.035634

Similar Items