Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation
Records of ice-rafted detritus (IRD) concentration in deep-sea cores from the southeast Atlantic Ocean reveal millennial-scale pulses of IRD delivery between 20,000 and 74,000 years ago. Prominent IRD layers correlate across the Polar Frontal Zone, suggesting episodes of Antarctic Ice Sheet instabil...
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Online Access: | http://dx.doi.org/10.1126/science.288.5472.1815 https://www.science.org/doi/pdf/10.1126/science.288.5472.1815 |
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craaas:10.1126/science.288.5472.1815 2024-09-09T19:03:18+00:00 Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation Kanfoush, Sharon L. Hodell, David A. Charles, Christopher D. Guilderson, Thomas P. Mortyn, P. Graham Ninnemann, Ulysses S. 2000 http://dx.doi.org/10.1126/science.288.5472.1815 https://www.science.org/doi/pdf/10.1126/science.288.5472.1815 en eng American Association for the Advancement of Science (AAAS) Science volume 288, issue 5472, page 1815-1819 ISSN 0036-8075 1095-9203 journal-article 2000 craaas https://doi.org/10.1126/science.288.5472.1815 2024-07-25T04:00:26Z Records of ice-rafted detritus (IRD) concentration in deep-sea cores from the southeast Atlantic Ocean reveal millennial-scale pulses of IRD delivery between 20,000 and 74,000 years ago. Prominent IRD layers correlate across the Polar Frontal Zone, suggesting episodes of Antarctic Ice Sheet instability. Carbon isotopes (δ 13 C) of benthic foraminifers, a proxy of deepwater circulation, reveal that South Atlantic IRD events coincided with strong increases in North Atlantic Deep Water (NADW) production and inferred warming (interstadials) in the high-latitude North Atlantic. Sea level rise or increased NADW production associated with strong interstadials may have resulted in destabilization of grounded ice shelves and possible surging in the Weddell Sea region of West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NADW North Atlantic Deep Water North Atlantic Weddell Sea West Antarctica AAAS Resource Center (American Association for the Advancement of Science) Antarctic The Antarctic Weddell Weddell Sea West Antarctica Science 288 5472 1815 1819 |
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Open Polar |
collection |
AAAS Resource Center (American Association for the Advancement of Science) |
op_collection_id |
craaas |
language |
English |
description |
Records of ice-rafted detritus (IRD) concentration in deep-sea cores from the southeast Atlantic Ocean reveal millennial-scale pulses of IRD delivery between 20,000 and 74,000 years ago. Prominent IRD layers correlate across the Polar Frontal Zone, suggesting episodes of Antarctic Ice Sheet instability. Carbon isotopes (δ 13 C) of benthic foraminifers, a proxy of deepwater circulation, reveal that South Atlantic IRD events coincided with strong increases in North Atlantic Deep Water (NADW) production and inferred warming (interstadials) in the high-latitude North Atlantic. Sea level rise or increased NADW production associated with strong interstadials may have resulted in destabilization of grounded ice shelves and possible surging in the Weddell Sea region of West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Kanfoush, Sharon L. Hodell, David A. Charles, Christopher D. Guilderson, Thomas P. Mortyn, P. Graham Ninnemann, Ulysses S. |
spellingShingle |
Kanfoush, Sharon L. Hodell, David A. Charles, Christopher D. Guilderson, Thomas P. Mortyn, P. Graham Ninnemann, Ulysses S. Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
author_facet |
Kanfoush, Sharon L. Hodell, David A. Charles, Christopher D. Guilderson, Thomas P. Mortyn, P. Graham Ninnemann, Ulysses S. |
author_sort |
Kanfoush, Sharon L. |
title |
Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
title_short |
Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
title_full |
Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
title_fullStr |
Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
title_full_unstemmed |
Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation |
title_sort |
millennial-scale instability of the antarctic ice sheet during the last glaciation |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1126/science.288.5472.1815 https://www.science.org/doi/pdf/10.1126/science.288.5472.1815 |
geographic |
Antarctic The Antarctic Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NADW North Atlantic Deep Water North Atlantic Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves NADW North Atlantic Deep Water North Atlantic Weddell Sea West Antarctica |
op_source |
Science volume 288, issue 5472, page 1815-1819 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.288.5472.1815 |
container_title |
Science |
container_volume |
288 |
container_issue |
5472 |
container_start_page |
1815 |
op_container_end_page |
1819 |
_version_ |
1809817301658107904 |