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Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP

Author

Listed:
  • Abhijith U. Venugopal

    (GNS Science
    Victoria University of Wellington
    University of Canterbury)

  • Nancy A. N. Bertler

    (GNS Science
    Victoria University of Wellington)

  • Jeffrey P. Severinghaus

    (UC San Diego)

  • Edward J. Brook

    (Oregon State University)

  • Giuseppe Cortese

    (GNS Science)

  • James E. Lee

    (Oregon State University)

  • Thomas Blunier

    (University of Copenhagen)

  • Paul A. Mayewski

    (University of Maine)

  • Helle A. Kjær

    (University of Copenhagen
    University of Tasmania)

  • Lionel Carter

    (Victoria University of Wellington)

  • Michael E. Weber

    (University of Bonn)

  • Richard H. Levy

    (GNS Science
    Victoria University of Wellington)

  • Rebecca L. Pyne

    (GNS Science)

  • Marcus J. Vandergoes

    (GNS Science)

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.

Suggested Citation

  • 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 , 2023. "Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40951-1
    DOI: 10.1038/s41467-023-40951-1
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    References listed on IDEAS

    as
    1. Marcus J. Vandergoes & Rewi M. Newnham & Frank Preusser & Chris H. Hendy & Thomas V. Lowell & Sean J. Fitzsimons & Alan G. Hogg & Haino Uwe Kasper & Christian Schlüchter, 2005. "Regional insolation forcing of late Quaternary climate change in the Southern Hemisphere," Nature, Nature, vol. 436(7048), pages 242-245, July.
    2. Jinho Ahn & Edward J. Brook, 2014. "Siple Dome ice reveals two modes of millennial CO2 change during the last ice age," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
    3. Giovanni Baccolo & Barbara Delmonte & P. B. Niles & Giannantonio Cibin & Elena Di Stefano & Dariush Hampai & Lindsay Keller & Valter Maggi & Augusto Marcelli & Joseph Michalski & Christopher Snead & M, 2021. "Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    4. Christo Buizert & Michael Sigl & Mirko Severi & Bradley R. Markle & Justin J. Wettstein & Joseph R. McConnell & Joel B. Pedro & Harald Sodemann & Kumiko Goto-Azuma & Kenji Kawamura & Shuji Fujita & Hi, 2018. "Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north," Nature, Nature, vol. 563(7733), pages 681-685, November.
    5. F. Lambert & B. Delmonte & J. R. Petit & M. Bigler & P. R. Kaufmann & M. A. Hutterli & T. F. Stocker & U. Ruth & J. P. Steffensen & V. Maggi, 2008. "Dust-climate couplings over the past 800,000 years from the EPICA Dome C ice core," Nature, Nature, vol. 452(7187), pages 616-619, April.
    6. Torben Struve & Katharina Pahnke & Frank Lamy & Marc Wengler & Philipp Böning & Gisela Winckler, 2020. "A circumpolar dust conveyor in the glacial Southern Ocean," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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