Antarctic ice shelf potentially stabilized by export of meltwater in surface river
Meltwater stored in ponds and crevasses can weaken and fracture ice shelves, triggering their rapid disintegration. This ice-shelf collapse results in an increased flux of ice from adjacent glaciers and ice streams, thereby raising sea level globally. However, surface rivers forming on ice shelves c...
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ftenea:oai:iris.enea.it:20.500.12079/1858 2024-03-31T07:48:59+00:00 Antarctic ice shelf potentially stabilized by export of meltwater in surface river Frezzotti, M. Frezzotti, M. 2017 https://hdl.handle.net/20.500.12079/1858 https://doi.org/10.1038/nature22048 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018164299&doi=10.1038%2fnature22048&partnerID=40&md5=65ca9a8db9c37a47e8ee378e59104dc8 en eng Nature Publishing Group volume:544 issue:7650 numberofpages:344 - 348 journal:NATURE http://hdl.handle.net/20.500.12079/1858 doi:10.1038/nature22048 info:eu-repo/semantics/altIdentifier/scopus/Scopus ID: 2-s2.0-85018164299 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018164299&doi=10.1038%2fnature22048&partnerID=40&md5=65ca9a8db9c37a47e8ee378e59104dc8 info:eu-repo/semantics/article 2017 ftenea https://doi.org/20.500.12079/185810.1038/nature22048 2024-03-06T00:15:28Z Meltwater stored in ponds and crevasses can weaken and fracture ice shelves, triggering their rapid disintegration. This ice-shelf collapse results in an increased flux of ice from adjacent glaciers and ice streams, thereby raising sea level globally. However, surface rivers forming on ice shelves could potentially export stored meltwater and prevent its destructive effects. Here we present evidence for persistent active drainage networks - interconnected streams, ponds and rivers - on the Nansen Ice Shelf in Antarctica that export a large fraction of the ice shelf's meltwater into the ocean. We find that active drainage has exported water off the ice surface through waterfalls and dolines for more than a century. The surface river terminates in a 130-metre-wide waterfall that can export the entire annual surface melt over the course of seven days. During warmer melt seasons, these drainage networks adapt to changing environmental conditions by remaining active for longer and exporting more water. Similar networks are present on the ice shelf in front of Petermann Glacier, Greenland, but other systems, such as on the Larsen C and Amery Ice Shelves, retain surface water at present. The underlying reasons for export versus retention remain unclear. Nonetheless our results suggest that, in a future warming climate, surface rivers could export melt off the large ice shelves surrounding Antarctica - contrary to present Antarctic ice-sheet models, which assume that meltwater is stored on the ice surface where it triggers ice-shelf disintegration. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica glacier Greenland Ice Sheet Ice Shelf Ice Shelves Petermann glacier ENEA-IRIS Open Archive (Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Antarctic Greenland Nature 544 7650 344 348 |
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Open Polar |
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ENEA-IRIS Open Archive (Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile) |
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ftenea |
language |
English |
description |
Meltwater stored in ponds and crevasses can weaken and fracture ice shelves, triggering their rapid disintegration. This ice-shelf collapse results in an increased flux of ice from adjacent glaciers and ice streams, thereby raising sea level globally. However, surface rivers forming on ice shelves could potentially export stored meltwater and prevent its destructive effects. Here we present evidence for persistent active drainage networks - interconnected streams, ponds and rivers - on the Nansen Ice Shelf in Antarctica that export a large fraction of the ice shelf's meltwater into the ocean. We find that active drainage has exported water off the ice surface through waterfalls and dolines for more than a century. The surface river terminates in a 130-metre-wide waterfall that can export the entire annual surface melt over the course of seven days. During warmer melt seasons, these drainage networks adapt to changing environmental conditions by remaining active for longer and exporting more water. Similar networks are present on the ice shelf in front of Petermann Glacier, Greenland, but other systems, such as on the Larsen C and Amery Ice Shelves, retain surface water at present. The underlying reasons for export versus retention remain unclear. Nonetheless our results suggest that, in a future warming climate, surface rivers could export melt off the large ice shelves surrounding Antarctica - contrary to present Antarctic ice-sheet models, which assume that meltwater is stored on the ice surface where it triggers ice-shelf disintegration. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
author2 |
Frezzotti, M. |
format |
Article in Journal/Newspaper |
author |
Frezzotti, M. |
spellingShingle |
Frezzotti, M. Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
author_facet |
Frezzotti, M. |
author_sort |
Frezzotti, M. |
title |
Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
title_short |
Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
title_full |
Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
title_fullStr |
Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
title_full_unstemmed |
Antarctic ice shelf potentially stabilized by export of meltwater in surface river |
title_sort |
antarctic ice shelf potentially stabilized by export of meltwater in surface river |
publisher |
Nature Publishing Group |
publishDate |
2017 |
url |
https://hdl.handle.net/20.500.12079/1858 https://doi.org/10.1038/nature22048 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018164299&doi=10.1038%2fnature22048&partnerID=40&md5=65ca9a8db9c37a47e8ee378e59104dc8 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) |
geographic |
Amery Antarctic Greenland |
geographic_facet |
Amery Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica glacier Greenland Ice Sheet Ice Shelf Ice Shelves Petermann glacier |
genre_facet |
Antarc* Antarctic Antarctica glacier Greenland Ice Sheet Ice Shelf Ice Shelves Petermann glacier |
op_relation |
volume:544 issue:7650 numberofpages:344 - 348 journal:NATURE http://hdl.handle.net/20.500.12079/1858 doi:10.1038/nature22048 info:eu-repo/semantics/altIdentifier/scopus/Scopus ID: 2-s2.0-85018164299 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018164299&doi=10.1038%2fnature22048&partnerID=40&md5=65ca9a8db9c37a47e8ee378e59104dc8 |
op_doi |
https://doi.org/20.500.12079/185810.1038/nature22048 |
container_title |
Nature |
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544 |
container_issue |
7650 |
container_start_page |
344 |
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348 |
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