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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 3 | Copyright
Atmos. Chem. Phys., 17, 1741-1758, 2017
https://doi.org/10.5194/acp-17-1741-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 Feb 2017

Research article | 03 Feb 2017

Evolution of the eastward shift in the quasi-stationary minimum of the Antarctic total ozone column

Asen Grytsai1, Andrew Klekociuk2,3, Gennadi Milinevsky1,4, Oleksandr Evtushevsky1, and Kane Stone5,6,a Asen Grytsai et al.
  • 1Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
  • 2Antarctica and the Global System Program, Australian Antarctic Division, Kingston, Tasmania 7050, Australia
  • 3Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Tasmania 7000, Australia
  • 4Main Astronomical Observatory, National Academy of Sciences of Ukraine, 03143 Kyiv, Ukraine
  • 5School of Earth Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
  • 6ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales 2052, Australia
  • acurrently at: the Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA

Abstract. The quasi-stationary pattern of the Antarctic total ozone has changed during the last 4 decades, showing an eastward shift in the zonal ozone minimum. In this work, the association between the longitudinal shift of the zonal ozone minimum and changes in meteorological fields in austral spring (September–November) for 1979–2014 is analyzed using ERA-Interim and NCEP–NCAR reanalyses. Regressive, correlative and anomaly composite analyses are applied to reanalysis data. Patterns of the Southern Annular Mode and quasi-stationary zonal waves 1 and 3 in the meteorological fields show relationships with interannual variability in the longitude of the zonal ozone minimum. On decadal timescales, consistent longitudinal shifts of the zonal ozone minimum and zonal wave 3 pattern in the middle-troposphere temperature at the southern midlatitudes are shown. Attribution runs of the chemistry–climate version of the Australian Community Climate and Earth System Simulator (ACCESS-CCM) model suggest that long-term shifts of the zonal ozone minimum are separately contributed by changes in ozone-depleting substances and greenhouse gases. As is known, Antarctic ozone depletion in spring is strongly projected on the Southern Annular Mode in summer and impacts summertime surface climate across the Southern Hemisphere. The results of this study suggest that changes in zonal ozone asymmetry accompanying ozone depletion could be associated with regional climate changes in the Southern Hemisphere in spring.

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Twenty years ago we discovered that the ozone hole shape is asymmetric. This asymmetry is minimum over the Weddell Sea region and maximum over the Ross Sea area. Later we detected that the position of the ozone minimum is shifting east. We have continued to follow this event, and a couple years ago we revealed that the shift is slowing down and starting to move back. We connect all this movement with ozone hole increase; since 2000 the ozone layer has been stabilizing and recently recovering.
Twenty years ago we discovered that the ozone hole shape is asymmetric. This asymmetry is...
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