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| Titel |
Planetary waves in the upper stratosphere and lower mesosphere during 2009 Arctic major stratospheric warming |
| VerfasserIn |
P. Kishore, I. Velicogna, M. Venkat Ratnam, J. H. Jiang, G. N. Madhavi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 10 ; Nr. 30, no. 10 (2012-10-10), S.1529-1538 |
| Datensatznummer |
250017281
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1529-2012.pdf |
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| Zusammenfassung |
| 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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