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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 3
Ann. Geophys., 21, 805–817, 2003
https://doi.org/10.5194/angeo-21-805-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 805–817, 2003
https://doi.org/10.5194/angeo-21-805-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2003

31 Mar 2003

Classification of hemispheric monthly mean stratospheric potential vorticity fields

R. Huth1 and P. O. Canziani3,2 R. Huth and P. O. Canziani
  • 1Institute of Atmospheric Physics, Praha, Czech Republic
  • 2Grupo de Atmósfera Media, Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, CONICET/Universidad de Buenos Aires, Buenos Aires, Argentina
  • 3Unidad Docente Ciencias Básicas Matemática, Facultad Regional Buenos Aires, Universidad Tecnológica Nacional, Argentina

Abstract. Monthly mean NCEP reanalysis potential vorticity fields at the 650 K isentropic level over the Northern and Southern Hemispheres between 1979 and 1997 were studied using multivariate analysis tools. Principal component analysis in the T-mode was applied to demonstrate the validity of such statistical techniques for the study of stratospheric dynamics and climatology. The method, complementarily applied to both the raw and anomaly fields, was useful in determining and classifying the characteristics of winter and summer PV fields on both hemispheres, in particular, the well-known differences in the behaviour and persistence of the polar vortices. It was possible to identify such features as sudden warming events in the Northern Hemisphere and final warming dates in both hemispheres. The stratospheric impact of other atmospheric processes, such as volcanic eruptions, also identified though the results, must be viewed at this stage as tentative. An interesting change in behaviour around 1990 was detected over both hemispheres.

Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; general circulation; climatology)

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