Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP
Abstract High-resolution ice core records from coastal Antarctica are particularly useful to inform our understanding of environmental changes and their drivers. Here, we present a decadally resolved record of sea-salt sodium (a proxy for open-ocean area) and non-sea salt calcium (a proxy for contin...
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ftdoajarticles:oai:doaj.org/article:e515b10b2933403ba12334357c7140d6 2023-10-09T21:45:30+02:00 Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP Abhijith U. Venugopal Nancy A. N. Bertler Jeffrey P. Severinghaus Edward J. Brook Giuseppe Cortese James E. Lee Thomas Blunier Paul A. Mayewski Helle A. Kjær Lionel Carter Michael E. Weber Richard H. Levy Rebecca L. Pyne Marcus J. Vandergoes 2023-09-01T00:00:00Z https://doi.org/10.1038/s41467-023-40951-1 https://doaj.org/article/e515b10b2933403ba12334357c7140d6 EN eng Nature Portfolio https://doi.org/10.1038/s41467-023-40951-1 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-023-40951-1 2041-1723 https://doaj.org/article/e515b10b2933403ba12334357c7140d6 Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023) Science Q article 2023 ftdoajarticles https://doi.org/10.1038/s41467-023-40951-1 2023-09-17T00:39:25Z Abstract High-resolution ice core records from coastal Antarctica are particularly useful to inform our understanding of environmental changes and their drivers. Here, we present a decadally resolved record of sea-salt sodium (a proxy for open-ocean area) and non-sea salt calcium (a proxy for continental dust) from the well-dated Roosevelt Island Climate Evolution (RICE) core, focusing on the time period between 40–26 ka BP. The RICE dust record exhibits an abrupt shift towards a higher mean dust concentration at 32 ka BP. Investigating existing ice-core records, we find this shift is a prominent feature across Antarctica. We propose that this shift is linked to an equatorward displacement of Southern Hemisphere westerly winds. Subsequent to the wind shift, data suggest a weakening of Southern Ocean upwelling and a decline of atmospheric CO2 to lower glacial values, hence making this shift an important glacial climate event with potentially important insights for future projections. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Roosevelt Island Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) Southern Ocean Nature Communications 14 1 |
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Directory of Open Access Journals: DOAJ Articles |
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Science Q Abhijith U. Venugopal Nancy A. N. Bertler Jeffrey P. Severinghaus Edward J. Brook Giuseppe Cortese James E. Lee Thomas Blunier Paul A. Mayewski Helle A. Kjær Lionel Carter Michael E. Weber Richard H. Levy Rebecca L. Pyne Marcus J. Vandergoes Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
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Science Q |
description |
Abstract High-resolution ice core records from coastal Antarctica are particularly useful to inform our understanding of environmental changes and their drivers. Here, we present a decadally resolved record of sea-salt sodium (a proxy for open-ocean area) and non-sea salt calcium (a proxy for continental dust) from the well-dated Roosevelt Island Climate Evolution (RICE) core, focusing on the time period between 40–26 ka BP. The RICE dust record exhibits an abrupt shift towards a higher mean dust concentration at 32 ka BP. Investigating existing ice-core records, we find this shift is a prominent feature across Antarctica. We propose that this shift is linked to an equatorward displacement of Southern Hemisphere westerly winds. Subsequent to the wind shift, data suggest a weakening of Southern Ocean upwelling and a decline of atmospheric CO2 to lower glacial values, hence making this shift an important glacial climate event with potentially important insights for future projections. |
format |
Article in Journal/Newspaper |
author |
Abhijith U. Venugopal Nancy A. N. Bertler Jeffrey P. Severinghaus Edward J. Brook Giuseppe Cortese James E. Lee Thomas Blunier Paul A. Mayewski Helle A. Kjær Lionel Carter Michael E. Weber Richard H. Levy Rebecca L. Pyne Marcus J. Vandergoes |
author_facet |
Abhijith U. Venugopal Nancy A. N. Bertler Jeffrey P. Severinghaus Edward J. Brook Giuseppe Cortese James E. Lee Thomas Blunier Paul A. Mayewski Helle A. Kjær Lionel Carter Michael E. Weber Richard H. Levy Rebecca L. Pyne Marcus J. Vandergoes |
author_sort |
Abhijith U. Venugopal |
title |
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
title_short |
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
title_full |
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
title_fullStr |
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
title_full_unstemmed |
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP |
title_sort |
antarctic evidence for an abrupt northward shift of the southern hemisphere westerlies at 32 ka bp |
publisher |
Nature Portfolio |
publishDate |
2023 |
url |
https://doi.org/10.1038/s41467-023-40951-1 https://doaj.org/article/e515b10b2933403ba12334357c7140d6 |
long_lat |
ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
geographic |
Antarctic Roosevelt Island Southern Ocean |
geographic_facet |
Antarctic Roosevelt Island Southern Ocean |
genre |
Antarc* Antarctic Antarctica ice core Roosevelt Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice core Roosevelt Island Southern Ocean |
op_source |
Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023) |
op_relation |
https://doi.org/10.1038/s41467-023-40951-1 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-023-40951-1 2041-1723 https://doaj.org/article/e515b10b2933403ba12334357c7140d6 |
op_doi |
https://doi.org/10.1038/s41467-023-40951-1 |
container_title |
Nature Communications |
container_volume |
14 |
container_issue |
1 |
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1779319240860368896 |