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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 6
Ann. Geophys., 25, 1279–1298, 2007
https://doi.org/10.5194/angeo-25-1279-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1279–1298, 2007
https://doi.org/10.5194/angeo-25-1279-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Jun 2007

29 Jun 2007

Polar vortex evolution during Northern Hemispheric winter 2004/05

T. Chshyolkova1, A. H. Manson1, C. E. Meek1, T. Aso2, S. K. Avery3, C. M. Hall4, W. Hocking5, K. Igarashi6, C. Jacobi7, N. Makarov8, N. Mitchell9, Y. Murayama6, W. Singer10, D. Thorsen11, and M. Tsutsumi2 T. Chshyolkova et al.
  • 1Institute of Space and Atmospheric Studies, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
  • 2National Institute of Polar Research, Tokyo, Japan
  • 3CIRES, University of Colorado, Boulder, USA
  • 4Tromsø Geophysical Observatory, University of Tromsø, Tromsø, Norway
  • 5Department of Physics and Astronomy, University of Western Ontario, London, Canada
  • 6National Institute of Information and Communications Technology, Tokyo, Japan
  • 7Institute for Meteorology, University of Leipzig, Leipzig, Germany
  • 8Institute for Experimental Meteorology, SPA "Typhoon", Obninsk, Russia
  • 9Centre for Space, Atmospheric, and Oceanic Sciences, Department of Electronic and Electrical Engineering, University of Bath, Bath, UK
  • 10Leibniz-Institut fur Atmospharen physik an der Universitat Rostock, Kühlungsborn, Germany
  • 11Department of Electrical and Computer Engineering, University of Alaska, Fairbanks, USA

Abstract. As a part of the project "Atmospheric Wave Influences upon the Winter Polar Vortices (0–100 km)" of the CAWSES program, data from meteor and Medium Frequency radars at 12 locations and MetO (UK Meteorological Office) global assimilated fields have been analyzed for the first campaign during the Northern Hemispheric winter of 2004/05. The stratospheric state has been described using the conventional zonal mean parameters as well as Q-diagnostic, which allows consideration of the longitudinal variability.

The stratosphere was cold during winter of 2004/05, and the polar vortex was relatively strong during most of the winter with relatively weak disturbances occurring at the end of December and the end of January. For this winter the strongest deformation with the splitting of the polar vortex in the lower stratosphere was observed at the end of February. Here the results show strong latitudinal and longitudinal differences that are evident in the stratospheric and mesospheric data sets at different stations. Eastward winds are weaker and oscillations with planetary wave periods have smaller amplitudes at more poleward stations. Accordingly, the occurrence, time and magnitude of the observed reversal of the zonal mesospheric winds associated with stratospheric disturbances depend on the local stratospheric conditions. In general, compared to previous years, the winter of 2004/05 could be characterized by weak planetary wave activity at stratospheric and mesospheric heights.

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