Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage
Surface meltwater that reaches the base of an ice sheet creates a mechanism for the rapid response of ice flow to climate change. The process whereby such a pathway is created through thick, cold ice has not, however, been previously observed. We describe the rapid (<2 hours) drainage of a large...
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American Association for the Advancement of Science (AAAS)
2008
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Online Access: | http://dx.doi.org/10.1126/science.1153360 https://www.science.org/doi/pdf/10.1126/science.1153360 |
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craaas:10.1126/science.1153360 2024-06-23T07:53:15+00:00 Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage Das, Sarah B. Joughin, Ian Behn, Mark D. Howat, Ian M. King, Matt A. Lizarralde, Dan Bhatia, Maya P. 2008 http://dx.doi.org/10.1126/science.1153360 https://www.science.org/doi/pdf/10.1126/science.1153360 en eng American Association for the Advancement of Science (AAAS) Science volume 320, issue 5877, page 778-781 ISSN 0036-8075 1095-9203 journal-article 2008 craaas https://doi.org/10.1126/science.1153360 2024-06-13T04:01:07Z Surface meltwater that reaches the base of an ice sheet creates a mechanism for the rapid response of ice flow to climate change. The process whereby such a pathway is created through thick, cold ice has not, however, been previously observed. We describe the rapid (<2 hours) drainage of a large supraglacial lake down 980 meters through to the bed of the Greenland Ice Sheet initiated by water-driven fracture propagation evolving into moulin flow. Drainage coincided with increased seismicity, transient acceleration, ice-sheet uplift, and horizontal displacement. Subsidence and deceleration occurred over the subsequent 24 hours. The short-lived dynamic response suggests that an efficient drainage system dispersed the meltwater subglacially. The integrated effect of multiple lake drainages could explain the observed net regional summer ice speedup. Article in Journal/Newspaper Greenland Ice Sheet AAAS Resource Center (American Association for the Advancement of Science) Greenland Science 320 5877 778 781 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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language |
English |
description |
Surface meltwater that reaches the base of an ice sheet creates a mechanism for the rapid response of ice flow to climate change. The process whereby such a pathway is created through thick, cold ice has not, however, been previously observed. We describe the rapid (<2 hours) drainage of a large supraglacial lake down 980 meters through to the bed of the Greenland Ice Sheet initiated by water-driven fracture propagation evolving into moulin flow. Drainage coincided with increased seismicity, transient acceleration, ice-sheet uplift, and horizontal displacement. Subsidence and deceleration occurred over the subsequent 24 hours. The short-lived dynamic response suggests that an efficient drainage system dispersed the meltwater subglacially. The integrated effect of multiple lake drainages could explain the observed net regional summer ice speedup. |
format |
Article in Journal/Newspaper |
author |
Das, Sarah B. Joughin, Ian Behn, Mark D. Howat, Ian M. King, Matt A. Lizarralde, Dan Bhatia, Maya P. |
spellingShingle |
Das, Sarah B. Joughin, Ian Behn, Mark D. Howat, Ian M. King, Matt A. Lizarralde, Dan Bhatia, Maya P. Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
author_facet |
Das, Sarah B. Joughin, Ian Behn, Mark D. Howat, Ian M. King, Matt A. Lizarralde, Dan Bhatia, Maya P. |
author_sort |
Das, Sarah B. |
title |
Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
title_short |
Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
title_full |
Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
title_fullStr |
Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
title_full_unstemmed |
Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage |
title_sort |
fracture propagation to the base of the greenland ice sheet during supraglacial lake drainage |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1126/science.1153360 https://www.science.org/doi/pdf/10.1126/science.1153360 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Science volume 320, issue 5877, page 778-781 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1153360 |
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Science |
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320 |
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5877 |
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778 |
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781 |
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1802644814805598208 |