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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 3
Ann. Geophys., 22, 725–731, 2004
https://doi.org/10.5194/angeo-22-725-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 725–731, 2004
https://doi.org/10.5194/angeo-22-725-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  19 Mar 2004

19 Mar 2004

Geomagnetic activity forcing of the Northern Annular Mode via the stratosphere

D. R. Palamara and E. A. Bryant D. R. Palamara and E. A. Bryant
  • University of Wollongong, School of Geosciences, NSW 2522, Australia

Abstract. We consider various aspects of the link between solar-modulated geomagnetic activity and the Northern Annular Mode (NAM). Our results indicate that the geomagnetic forcing of atmospheric circulation in the Northern Hemisphere is temporally and seasonally restricted, modulated by the Quasi-Biennial Oscillation (QBO), and reliant on stratosphere-troposphere coupling. When the data are restricted to January values after 1965, for years in which the January QBO is eastwards, the correlation coefficient between the geomagnetic AA index and the NAM is 0.85. These results can account for many of the enigmatic features of Northern Hemisphere circulation.

Key words. Meterology and atmospheric dynamics (general circulation, climatology)

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