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The Influence of circulation changes on Antarctic stratospheric ozone

The Influence of circulation changes on Antarctic stratospheric ozone
Andrew Klekociuk

Authors

Andrew Klekociuk
Australian Antarctic Division, 203 Channel Highway, Kingston TAS 7050 Australia

Abstract

As part of the FORCeS Project (AAS 4012) we are examining changes in the distribution of stratospheric ozone at high southern latitudes. Satellite measurements have revealed that the geographic distribution of total column ozone between latitudes of approximately 50°S and 75°S during spring has exhibited a general eastward shift over the past 3 decades. The most marked changes have been in the Weddell and Amundsen Sea regions, where the minimum in the ozone distribution shifted eastward by approximately 45° in longitude between 1979 and 2005.

Using assimilated meteorological data, we examine key characteristics of atmospheric circulation in the Antarctic region, focusing on large-scale atmospheric waves, the location of the stratospheric polar vortex and metrics of the Ozone Hole, and their relationship with observed trends in the ozone distribution.

We find that the trends in total column ozone are consistent with long-term changes in the phase and amplitude of quasi-stationary atmospheric Rossby waves that influence the transport of ozone. The changes in the characteristics of the Rossby waves show seasonal differences that suggest separate influences from springtime ozone depletion and other climate processes. Using runs of chemistry-climate models, we discuss the evolution of the ozone trends and the sensitivity of near-surface climate to these trends.

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  • 11th June 2013
    Registrations close
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    Conference commences
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    Conference concludes

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This page was last modified on 23 September 2013.