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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 10
Ann. Geophys., 30, 1529-1538, 2012
https://doi.org/10.5194/angeo-30-1529-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 1529-1538, 2012
https://doi.org/10.5194/angeo-30-1529-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 10 Oct 2012

Regular paper | 10 Oct 2012

Planetary waves in the upper stratosphere and lower mesosphere during 2009 Arctic major stratospheric warming

P. Kishore1, I. Velicogna1,2, M. Venkat Ratnam3, J. H. Jiang2, and G. N. Madhavi4 P. Kishore et al.
  • 1Department of Earth System Science, University of California, Irvine, CA, 92697, USA
  • 2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  • 3National Atmospheric Research Laboratory, Gadanki, Tirupati, India
  • 4Department of Physics, Sri Venkateswara University, Tirupati, India

Abstract. The AURA-MLS daily mean temperatures and zonal wind from NASA-MERRA reanalysis for latitudes between 60° N and 80° N are used to investigate the planetary wave (PW) characteristics in the stratosphere and lower mesosphere during sudden stratospheric warming (SSW) (November 2008 to March 2009). Here, we used a novel method called empirical mode decomposition (EMD) to extract the PWs from the temperature data. The EMD is an interesting approach to decompose signals into locally periodic components, the intrinsic mode functions (IMFs), and will easily identify the embedded structures, even those with small amplitudes. The spectral analysis reveals prevailing planetary wave periods of ~6-day, ~8-day, ~15-day, and ~21–23-day in IMFs 1, 2, 3, and 4, respectively. Clear upward propagation of these waves (20–30 days) is observed, suggesting that sources for these oscillations are in the troposphere.

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