Melting at the base of the Greenland ice sheet explained by Iceland hotspot history
Ice-penetrating radar and ice core drilling4 have shown that large parts of the north-central Greenland ice sheet are melting from below. It has been argued that basal ice melt is due to the anomalously high geothermal flux, that has also influenced the development of the longest ice stream in Green...
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ftoslouniv:oai:www.duo.uio.no:10852/61997 2023-05-15T16:23:24+02:00 Melting at the base of the Greenland ice sheet explained by Iceland hotspot history Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan 2016-12-07T13:28:55Z http://hdl.handle.net/10852/61997 http://urn.nb.no/URN:NBN:no-64599 https://doi.org/10.1038/ngeo2689 EN eng NFR/223272 http://urn.nb.no/URN:NBN:no-64599 Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan . Melting at the base of the Greenland ice sheet explained by Iceland hotspot history. Nature Geoscience. 2016, 9(5), 366-369 http://hdl.handle.net/10852/61997 1409569 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature Geoscience&rft.volume=9&rft.spage=366&rft.date=2016 Nature Geoscience 9 5 366 369 http://dx.doi.org/10.1038/ngeo2689 URN:NBN:no-64599 Fulltext https://www.duo.uio.no/bitstream/handle/10852/61997/2/1487978-2-35.pdf 1752-0894 Journal article Tidsskriftartikkel Peer reviewed AcceptedVersion 2016 ftoslouniv https://doi.org/10.1038/ngeo2689 2020-06-21T08:51:35Z Ice-penetrating radar and ice core drilling4 have shown that large parts of the north-central Greenland ice sheet are melting from below. It has been argued that basal ice melt is due to the anomalously high geothermal flux, that has also influenced the development of the longest ice stream in Greenland. Here we estimate the geothermal flux beneath the Greenland ice sheet and identify a 1,200-km-long and 400-km-wide geothermal anomaly beneath the thick ice cover. We suggest that this anomaly explains the observed melting of the ice sheet’s base, which drives the vigorous subglacial hydrology and controls the position of the head of the enigmatic 750-km-long northeastern Greenland ice stream5. Our combined analysis of independent seismic, gravity and tectonic data implies that the geothermal anomaly, which crosses Greenland from west to east, was formed by Greenland’s passage over the Iceland mantle plume between roughly 80 and 35 million years ago. We conclude that the complexity of the present-day subglacial hydrology and dynamic features of the north-central Greenland ice sheet originated in tectonic events that pre-date the onset of glaciation in Greenland by many tens of millions of years. Article in Journal/Newspaper Greenland ice core Ice Sheet Iceland Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Greenland Nature Geoscience 9 5 366 369 |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
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ftoslouniv |
language |
English |
description |
Ice-penetrating radar and ice core drilling4 have shown that large parts of the north-central Greenland ice sheet are melting from below. It has been argued that basal ice melt is due to the anomalously high geothermal flux, that has also influenced the development of the longest ice stream in Greenland. Here we estimate the geothermal flux beneath the Greenland ice sheet and identify a 1,200-km-long and 400-km-wide geothermal anomaly beneath the thick ice cover. We suggest that this anomaly explains the observed melting of the ice sheet’s base, which drives the vigorous subglacial hydrology and controls the position of the head of the enigmatic 750-km-long northeastern Greenland ice stream5. Our combined analysis of independent seismic, gravity and tectonic data implies that the geothermal anomaly, which crosses Greenland from west to east, was formed by Greenland’s passage over the Iceland mantle plume between roughly 80 and 35 million years ago. We conclude that the complexity of the present-day subglacial hydrology and dynamic features of the north-central Greenland ice sheet originated in tectonic events that pre-date the onset of glaciation in Greenland by many tens of millions of years. |
format |
Article in Journal/Newspaper |
author |
Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan |
spellingShingle |
Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
author_facet |
Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan |
author_sort |
Rogozhina, Irina |
title |
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
title_short |
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
title_full |
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
title_fullStr |
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
title_full_unstemmed |
Melting at the base of the Greenland ice sheet explained by Iceland hotspot history |
title_sort |
melting at the base of the greenland ice sheet explained by iceland hotspot history |
publishDate |
2016 |
url |
http://hdl.handle.net/10852/61997 http://urn.nb.no/URN:NBN:no-64599 https://doi.org/10.1038/ngeo2689 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Iceland |
genre_facet |
Greenland ice core Ice Sheet Iceland |
op_source |
1752-0894 |
op_relation |
NFR/223272 http://urn.nb.no/URN:NBN:no-64599 Rogozhina, Irina Petrunin, Alexey G Vaughan, Alan P M Steinberger, Bernhard Johnson, Jesse V Kaban, Mikhail K Calov, Reinhard Rickers, Florian Thomas, Maik Koulakov, Ivan . Melting at the base of the Greenland ice sheet explained by Iceland hotspot history. Nature Geoscience. 2016, 9(5), 366-369 http://hdl.handle.net/10852/61997 1409569 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature Geoscience&rft.volume=9&rft.spage=366&rft.date=2016 Nature Geoscience 9 5 366 369 http://dx.doi.org/10.1038/ngeo2689 URN:NBN:no-64599 Fulltext https://www.duo.uio.no/bitstream/handle/10852/61997/2/1487978-2-35.pdf |
op_doi |
https://doi.org/10.1038/ngeo2689 |
container_title |
Nature Geoscience |
container_volume |
9 |
container_issue |
5 |
container_start_page |
366 |
op_container_end_page |
369 |
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1766011653987500032 |