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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 11
Ann. Geophys., 21, 2175–2183, 2003
https://doi.org/10.5194/angeo-21-2175-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 2175–2183, 2003
https://doi.org/10.5194/angeo-21-2175-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Nov 2003

30 Nov 2003

Antarctic air over New Zealand following vortex breakdown in 1998

J. Ajtic2,1, B. J. Connor2, C. E. Randall3, B. N. Lawrence4, G. E. Bodeker2, J. E. Rosenfield5, and D. N. Heuff1 J. Ajtic et al.
  • 1Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
  • 2National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau 9182, Central Otago, New Zealand
  • 3Laboratory for Atmospheric and Space Physics, UCB 392, University of Colorado, Boulder, CO 80309-0392, USA
  • 4British Atmospheric Data Centre, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
  • 5Goddard Earth Sciences and Technology Center, NASA/Goddard Space Flight Center, Code 916, Greenbelt, MD 20771, USA

Abstract. An ozonesonde profile over the Network for Detection of Stratospheric Change (NDSC) site at Lauder (45.0° S, 169.7° E), New Zealand, for 24 December 1998 showed atypically low ozone centered around 24 km altitude (600 K potential temperature). The origin of the anomaly is explained using reverse domain filling (RDF) calculations combined with a PV/O3 fitting technique applied to ozone measurements from the Polar Ozone and Aerosol Measurement (POAM) III instrument. The RDF calculations for two isentropic surfaces, 550 and 600 K, show that ozone-poor air from the Antarctic polar vortex reached New Zealand on 24–26 December 1998. The vortex air on the 550 K isentrope originated in the ozone hole region, unlike the air on 600 K where low ozone values were caused by dynamical effects. High-resolution ozone maps were generated, and their examination shows that a vortex remnant situated above New Zealand was the cause of the altered ozone profile on 24 December. The maps also illustrate mixing of the vortex filaments into southern midlatitudes, whereby the overall mid-latitude ozone levels were decreased.

Key words. Atmospheric composition and structure (middle atmosphere composition and chemistry) – Meteorology and atmospheric dynamics (middle atmosphere dynamics)

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