Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing
The Southern Hemisphere westerly winds (SHW) play an important role in regulating the capacity of the Southern Ocean carbon sink. They modulate upwelling of carbon-rich deep water and, with sea ice, determine the ocean surface area available for air–sea gas exchange. Some models indicate that the cu...
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ftnerc:oai:nora.nerc.ac.uk:520606 2023-05-15T13:49:35+02:00 Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing Saunders, Krystyna M. Roberts, Stephen J. Perren, Bianca Butz, Christoph Sime, Louise Davies, Sarah Van Nieuwenhuyze, Wim Grosjean, Martin Hodgson, Dominic A. 2018-07-23 text http://nora.nerc.ac.uk/id/eprint/520606/ https://nora.nerc.ac.uk/id/eprint/520606/1/Saunders_et_al_final.pdf https://www.nature.com/articles/s41561-018-0186-5 en eng Springer Nature https://nora.nerc.ac.uk/id/eprint/520606/1/Saunders_et_al_final.pdf Saunders, Krystyna M.; Roberts, Stephen J. orcid:0000-0003-3407-9127 Perren, Bianca orcid:0000-0001-6089-6468 Butz, Christoph; Sime, Louise orcid:0000-0002-9093-7926 Davies, Sarah; Van Nieuwenhuyze, Wim; Grosjean, Martin; Hodgson, Dominic A. orcid:0000-0002-3841-3746 . 2018 Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing. Nature Geoscience, 11 (9). 650-655. https://doi.org/10.1038/s41561-018-0186-5 <https://doi.org/10.1038/s41561-018-0186-5> Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1038/s41561-018-0186-5 2023-02-04T19:46:51Z The Southern Hemisphere westerly winds (SHW) play an important role in regulating the capacity of the Southern Ocean carbon sink. They modulate upwelling of carbon-rich deep water and, with sea ice, determine the ocean surface area available for air–sea gas exchange. Some models indicate that the current strengthening and poleward shift of these winds will weaken the carbon sink. If correct, centennial- to millennial-scale reconstructions of the SHW intensity should be linked with past changes in atmospheric CO2, temperature and sea ice. Here we present a 12,300-year reconstruction of wind strength based on three independent proxies that track inputs of sea-salt aerosols and minerogenic particles accumulating in lake sediments on sub-Antarctic Macquarie Island. Between about 12.1 thousand years ago (ka) and 11.2 ka, and since about 7 ka, the wind intensities were above their long-term mean and corresponded with increasing atmospheric CO2. Conversely, from about 11.2 to 7.2 ka, the wind intensities were below their long-term mean and corresponded with decreasing atmospheric CO2. These observations are consistent with model inferences of enhanced SHW contributing to the long-term outgassing of CO2 from the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Macquarie Island Sea ice Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean Nature Geoscience 11 9 650 655 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
The Southern Hemisphere westerly winds (SHW) play an important role in regulating the capacity of the Southern Ocean carbon sink. They modulate upwelling of carbon-rich deep water and, with sea ice, determine the ocean surface area available for air–sea gas exchange. Some models indicate that the current strengthening and poleward shift of these winds will weaken the carbon sink. If correct, centennial- to millennial-scale reconstructions of the SHW intensity should be linked with past changes in atmospheric CO2, temperature and sea ice. Here we present a 12,300-year reconstruction of wind strength based on three independent proxies that track inputs of sea-salt aerosols and minerogenic particles accumulating in lake sediments on sub-Antarctic Macquarie Island. Between about 12.1 thousand years ago (ka) and 11.2 ka, and since about 7 ka, the wind intensities were above their long-term mean and corresponded with increasing atmospheric CO2. Conversely, from about 11.2 to 7.2 ka, the wind intensities were below their long-term mean and corresponded with decreasing atmospheric CO2. These observations are consistent with model inferences of enhanced SHW contributing to the long-term outgassing of CO2 from the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Saunders, Krystyna M. Roberts, Stephen J. Perren, Bianca Butz, Christoph Sime, Louise Davies, Sarah Van Nieuwenhuyze, Wim Grosjean, Martin Hodgson, Dominic A. |
spellingShingle |
Saunders, Krystyna M. Roberts, Stephen J. Perren, Bianca Butz, Christoph Sime, Louise Davies, Sarah Van Nieuwenhuyze, Wim Grosjean, Martin Hodgson, Dominic A. Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
author_facet |
Saunders, Krystyna M. Roberts, Stephen J. Perren, Bianca Butz, Christoph Sime, Louise Davies, Sarah Van Nieuwenhuyze, Wim Grosjean, Martin Hodgson, Dominic A. |
author_sort |
Saunders, Krystyna M. |
title |
Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
title_short |
Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
title_full |
Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
title_fullStr |
Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
title_full_unstemmed |
Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing |
title_sort |
holocene dynamics of the southern hemisphere westerly winds and possible links to co2 outgassing |
publisher |
Springer Nature |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/520606/ https://nora.nerc.ac.uk/id/eprint/520606/1/Saunders_et_al_final.pdf https://www.nature.com/articles/s41561-018-0186-5 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Macquarie Island Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Macquarie Island Sea ice Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/520606/1/Saunders_et_al_final.pdf Saunders, Krystyna M.; Roberts, Stephen J. orcid:0000-0003-3407-9127 Perren, Bianca orcid:0000-0001-6089-6468 Butz, Christoph; Sime, Louise orcid:0000-0002-9093-7926 Davies, Sarah; Van Nieuwenhuyze, Wim; Grosjean, Martin; Hodgson, Dominic A. orcid:0000-0002-3841-3746 . 2018 Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing. Nature Geoscience, 11 (9). 650-655. https://doi.org/10.1038/s41561-018-0186-5 <https://doi.org/10.1038/s41561-018-0186-5> |
op_doi |
https://doi.org/10.1038/s41561-018-0186-5 |
container_title |
Nature Geoscience |
container_volume |
11 |
container_issue |
9 |
container_start_page |
650 |
op_container_end_page |
655 |
_version_ |
1766251797830172672 |