Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing

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dc.contributor.authorSaunders, KMen_AU
dc.contributor.authorRoberts, SJen_AU
dc.contributor.authorPerren, Ben_AU
dc.contributor.authorButz, Cen_AU
dc.contributor.authorSime, Len_AU
dc.contributor.authorDavies, Sen_AU
dc.contributor.authorvan Nieuwenhuyze, Wen_AU
dc.contributor.authorGrosjean, Men_AU
dc.contributor.authorHodgson, DAen_AU
dc.date.accessioned2021-06-03T06:50:31Zen_AU
dc.date.available2021-06-03T06:50:31Zen_AU
dc.date.issued2018-07-23en_AU
dc.date.statistics2021-06-01en_AU
dc.description.abstractThe 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. © 2021 Springer Nature Limiteden_AU
dc.identifier.citationSaunders, K. M., Roberts, S. J., Perren, B., Butz, C., Sime, L., Davies, S., van Nieuwenhuyze, W., Grosjean, M., & Hodgson, D. A. (2018). Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing. Nature Geoscience, 11(9), 650-655. doi:10.1038/s41561-018-0186-5en_AU
dc.identifier.issn1752-0908en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitleNature Geoscienceen_AU
dc.identifier.pagination650-655en_AU
dc.identifier.urihttps://doi.org/10.1038/s41561-018-0186-5en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10822en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectWinden_AU
dc.subjectSeasen_AU
dc.subjectCurrentsen_AU
dc.subjectCarbon sinksen_AU
dc.subjectIceen_AU
dc.subjectTasmaniaen_AU
dc.subjectAtmospheresen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectDegassingen_AU
dc.titleHolocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassingen_AU
dc.typeJournal Articleen_AU
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