Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ...
The land-terminating margin of the Greenland Ice Sheet has slowed down in recent decades, although the causes and implications for future ice flow are unclear. Explained originally by a self-regulating mechanism where basal slip reduces as drainage evolves from low to high efficiency, recent numeric...
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ftdatacite:10.17863/cam.11932 2024-02-27T08:41:05+00:00 Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... Kulessa, B Hubbard, AL Booth, AD Bougamont, MH Dow, C Doyle, SH Christoffersen, P Lindback, K Pettersson, R Fitzpatrick, AW Jones, GA 2017 https://dx.doi.org/10.17863/cam.11932 https://www.repository.cam.ac.uk/handle/1810/267057 en eng AAAS open.access Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 0406 Physical Geography and Environmental Geoscience 0403 Geology article-journal ScholarlyArticle JournalArticle Article 2017 ftdatacite https://doi.org/10.17863/cam.11932 2024-02-01T14:55:16Z The land-terminating margin of the Greenland Ice Sheet has slowed down in recent decades, although the causes and implications for future ice flow are unclear. Explained originally by a self-regulating mechanism where basal slip reduces as drainage evolves from low to high efficiency, recent numerical modeling invokes a sedimentary control of ice sheet flow as an alternative hypothesis. Although both hypotheses can explain the recent slowdown, their respective forecasts of a long-term deceleration versus an acceleration of ice flow are contradictory. We present amplitude-versus-angle seismic data as the first observational test of the alternative hypothesis. We document transient modifications of basal sediment strengths by rapid subglacial drainages of supraglacial lakes, the primary current control on summer ice sheet flow according to our numerical model. Our observations agree with simulations of initial postdrainage sediment weakening and ice flow accelerations, and subsequent sediment restrengthening ... Article in Journal/Newspaper Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
0406 Physical Geography and Environmental Geoscience 0403 Geology |
spellingShingle |
0406 Physical Geography and Environmental Geoscience 0403 Geology Kulessa, B Hubbard, AL Booth, AD Bougamont, MH Dow, C Doyle, SH Christoffersen, P Lindback, K Pettersson, R Fitzpatrick, AW Jones, GA Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
topic_facet |
0406 Physical Geography and Environmental Geoscience 0403 Geology |
description |
The land-terminating margin of the Greenland Ice Sheet has slowed down in recent decades, although the causes and implications for future ice flow are unclear. Explained originally by a self-regulating mechanism where basal slip reduces as drainage evolves from low to high efficiency, recent numerical modeling invokes a sedimentary control of ice sheet flow as an alternative hypothesis. Although both hypotheses can explain the recent slowdown, their respective forecasts of a long-term deceleration versus an acceleration of ice flow are contradictory. We present amplitude-versus-angle seismic data as the first observational test of the alternative hypothesis. We document transient modifications of basal sediment strengths by rapid subglacial drainages of supraglacial lakes, the primary current control on summer ice sheet flow according to our numerical model. Our observations agree with simulations of initial postdrainage sediment weakening and ice flow accelerations, and subsequent sediment restrengthening ... |
format |
Article in Journal/Newspaper |
author |
Kulessa, B Hubbard, AL Booth, AD Bougamont, MH Dow, C Doyle, SH Christoffersen, P Lindback, K Pettersson, R Fitzpatrick, AW Jones, GA |
author_facet |
Kulessa, B Hubbard, AL Booth, AD Bougamont, MH Dow, C Doyle, SH Christoffersen, P Lindback, K Pettersson, R Fitzpatrick, AW Jones, GA |
author_sort |
Kulessa, B |
title |
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
title_short |
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
title_full |
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
title_fullStr |
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
title_full_unstemmed |
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow ... |
title_sort |
seismic evidence for complex sedimentary control of greenland ice sheet flow ... |
publisher |
AAAS |
publishDate |
2017 |
url |
https://dx.doi.org/10.17863/cam.11932 https://www.repository.cam.ac.uk/handle/1810/267057 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_rights |
open.access Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.17863/cam.11932 |
_version_ |
1792048346704117760 |