Late Miocene onset of the modern Antarctic Circumpolar Current
The Antarctic Circumpolar Current plays a pivotal role in global climate through its strong influence on the global overturning circulation, ocean heat and CO2 uptake. However, when and how the Antarctic Circumpolar Current reached its modern-like characteristics remains disputed. Here we present ne...
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Online Access: | https://hdl.handle.net/11250/3141306 https://doi.org/10.1038/s41561-023-01356-3 |
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ftnorce:oai:norceresearch.brage.unit.no:11250/3141306 2024-09-15T17:47:38+00:00 Late Miocene onset of the modern Antarctic Circumpolar Current Evangelinos, Dimitris Etourneau, Johan van de Flierdt, Tina Crosta, Xavier Jeandel, Catherine Flores, José-Abel Harwood, David M. Valero, Luis Ducassou, Emmanuelle Sauermilch, Isabel Klocker, Andreas Cacho, Isabel Pena, Leopoldo D. Kreissig, Katharina Benoit, Mathieu Belhadj, Moustafa Paredes, Eduardo Garcia-Solsona, Ester López-Quirós, Adrián Salabarnada, Ariadna Escutia, Carlota 2024 application/pdf https://hdl.handle.net/11250/3141306 https://doi.org/10.1038/s41561-023-01356-3 eng eng Nature Geoscience. 2024, 17 165-170. urn:issn:1752-0894 https://hdl.handle.net/11250/3141306 https://doi.org/10.1038/s41561-023-01356-3 cristin:2246720 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s) 2024 Nature Geoscience 17 165-170 Peer reviewed Journal article 2024 ftnorce https://doi.org/10.1038/s41561-023-01356-3 2024-07-21T23:32:10Z The Antarctic Circumpolar Current plays a pivotal role in global climate through its strong influence on the global overturning circulation, ocean heat and CO2 uptake. However, when and how the Antarctic Circumpolar Current reached its modern-like characteristics remains disputed. Here we present neodymium isotope and sortable silt records from sediment cores in the Southwest Pacific and South Indian oceans spanning the past 31 million years. Our data indicate that a circumpolar current like that of today did not exist before the late Miocene cooling. These findings suggest that the emergence of a homogeneous and deep-reaching strong Antarctic Circumpolar Current was not linked solely to the opening and deepening of Southern Ocean Gateways triggering continental-scale Antarctic Ice Sheet expansion during the Eocene–Oligocene Transition (∼34 Ma). Instead, we find that besides tectonic pre-conditioning, the expansion of the Antarctic Ice Sheet and sea ice since the middle Miocene Climate Transition (∼14 Ma) played a crucial role. This led to stronger density contrast and intensified Southern Westerly Winds across the Southern Ocean, establishing a vigorous deep-reaching circumpolar flow and an enhanced global overturning circulation, which amplified the late Cenozoic global cooling. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Southern Ocean NORCE vitenarkiv (Norwegian Research Centre) Nature Geoscience 17 2 165 170 |
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Open Polar |
collection |
NORCE vitenarkiv (Norwegian Research Centre) |
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ftnorce |
language |
English |
description |
The Antarctic Circumpolar Current plays a pivotal role in global climate through its strong influence on the global overturning circulation, ocean heat and CO2 uptake. However, when and how the Antarctic Circumpolar Current reached its modern-like characteristics remains disputed. Here we present neodymium isotope and sortable silt records from sediment cores in the Southwest Pacific and South Indian oceans spanning the past 31 million years. Our data indicate that a circumpolar current like that of today did not exist before the late Miocene cooling. These findings suggest that the emergence of a homogeneous and deep-reaching strong Antarctic Circumpolar Current was not linked solely to the opening and deepening of Southern Ocean Gateways triggering continental-scale Antarctic Ice Sheet expansion during the Eocene–Oligocene Transition (∼34 Ma). Instead, we find that besides tectonic pre-conditioning, the expansion of the Antarctic Ice Sheet and sea ice since the middle Miocene Climate Transition (∼14 Ma) played a crucial role. This led to stronger density contrast and intensified Southern Westerly Winds across the Southern Ocean, establishing a vigorous deep-reaching circumpolar flow and an enhanced global overturning circulation, which amplified the late Cenozoic global cooling. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Evangelinos, Dimitris Etourneau, Johan van de Flierdt, Tina Crosta, Xavier Jeandel, Catherine Flores, José-Abel Harwood, David M. Valero, Luis Ducassou, Emmanuelle Sauermilch, Isabel Klocker, Andreas Cacho, Isabel Pena, Leopoldo D. Kreissig, Katharina Benoit, Mathieu Belhadj, Moustafa Paredes, Eduardo Garcia-Solsona, Ester López-Quirós, Adrián Salabarnada, Ariadna Escutia, Carlota |
spellingShingle |
Evangelinos, Dimitris Etourneau, Johan van de Flierdt, Tina Crosta, Xavier Jeandel, Catherine Flores, José-Abel Harwood, David M. Valero, Luis Ducassou, Emmanuelle Sauermilch, Isabel Klocker, Andreas Cacho, Isabel Pena, Leopoldo D. Kreissig, Katharina Benoit, Mathieu Belhadj, Moustafa Paredes, Eduardo Garcia-Solsona, Ester López-Quirós, Adrián Salabarnada, Ariadna Escutia, Carlota Late Miocene onset of the modern Antarctic Circumpolar Current |
author_facet |
Evangelinos, Dimitris Etourneau, Johan van de Flierdt, Tina Crosta, Xavier Jeandel, Catherine Flores, José-Abel Harwood, David M. Valero, Luis Ducassou, Emmanuelle Sauermilch, Isabel Klocker, Andreas Cacho, Isabel Pena, Leopoldo D. Kreissig, Katharina Benoit, Mathieu Belhadj, Moustafa Paredes, Eduardo Garcia-Solsona, Ester López-Quirós, Adrián Salabarnada, Ariadna Escutia, Carlota |
author_sort |
Evangelinos, Dimitris |
title |
Late Miocene onset of the modern Antarctic Circumpolar Current |
title_short |
Late Miocene onset of the modern Antarctic Circumpolar Current |
title_full |
Late Miocene onset of the modern Antarctic Circumpolar Current |
title_fullStr |
Late Miocene onset of the modern Antarctic Circumpolar Current |
title_full_unstemmed |
Late Miocene onset of the modern Antarctic Circumpolar Current |
title_sort |
late miocene onset of the modern antarctic circumpolar current |
publishDate |
2024 |
url |
https://hdl.handle.net/11250/3141306 https://doi.org/10.1038/s41561-023-01356-3 |
genre |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
op_source |
Nature Geoscience 17 165-170 |
op_relation |
Nature Geoscience. 2024, 17 165-170. urn:issn:1752-0894 https://hdl.handle.net/11250/3141306 https://doi.org/10.1038/s41561-023-01356-3 cristin:2246720 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s) 2024 |
op_doi |
https://doi.org/10.1038/s41561-023-01356-3 |
container_title |
Nature Geoscience |
container_volume |
17 |
container_issue |
2 |
container_start_page |
165 |
op_container_end_page |
170 |
_version_ |
1810497088664895488 |