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Early peak in Antarctic oscillation index

Author

Listed:
  • Julie M. Jones

    (Institute for Coastal Research, GKSS Research Centre)

  • Martin Widmann

    (Institute for Coastal Research, GKSS Research Centre)

Abstract

The principal extratropical atmospheric circulation mode in the Southern Hemisphere, the Antarctic oscillation (or Southern Hemisphere annular mode), represents fluctuations in the strength of the circumpolar vortex and has shown a trend towards a positive index in austral summer in recent decades, which has been linked to stratospheric ozone depletion1,2 and to increased atmospheric greenhouse-gas concentrations3,4. Here we reconstruct the austral summer (December–January) Antarctic oscillation index from sea-level pressure measurements over the twentieth century5 and find that large positive values, and positive trends of a similar magnitude to those of past decades, also occurred around 1960, and that strong negative trends occurred afterwards. This positive Antarctic oscillation index and large positive trend during a period before ozone-depleting chemicals were released into the atmosphere and before marked anthropogenic warming, together with the later negative trend, indicate that natural forcing factors or internal mechanisms in the climate system must also strongly influence the state of the Antarctic oscillation.

Suggested Citation

  • Julie M. Jones & Martin Widmann, 2004. "Early peak in Antarctic oscillation index," Nature, Nature, vol. 432(7015), pages 290-291, November.
    • Handle: RePEc:nat:nature:v:432:y:2004:i:7015:d:10.1038_432290b
    DOI: 10.1038/432290b
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    Cited by:

    1. Ryan L. Fogt & Gareth J. Marshall, 2020. "The Southern Annular Mode: Variability, trends, and climate impacts across the Southern Hemisphere," Wiley Interdisciplinary Reviews: Climate Change, John Wiley & Sons, vol. 11(4), July.

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