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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 2
Ann. Geophys., 27, 617–622, 2009
https://doi.org/10.5194/angeo-27-617-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 617–622, 2009
https://doi.org/10.5194/angeo-27-617-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Feb 2009

09 Feb 2009

Method for assessing the amplitude modulation of the stationary planetary waves

P. Mukhtarov, D. Pancheva, and B. Andonov P. Mukhtarov et al.
  • Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria

Abstract. This short-communication presents a new method for assessing the amplitude modulation of the stationary planetary waves (SPWs). The suggested procedure allows estimating the contribution of the amplitude modulated SPWs to the field of the zonally travelling planetary waves. The root of the method consists in calculating of a quantity that is analogous to 2-D Lomb-Scargle amplitude spectrum and also the relative error of the approximation. The amplitude "spectra" of the SPWs give information about the period(s) of modulation, while the relative errors - define the coefficient(s) of modulation. The suggested method is applied to the UKMO temperature data for the Arctic winter of 2004–2005.

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