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| Titel |
A 20-day period standing oscillation in the northern winter stratosphere |
| VerfasserIn |
K. Hocke, S. Studer, O. Martius, D. Scheiben, N. Kämpfer |
| 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 ; 31, no. 4 ; Nr. 31, no. 4 (2013-04-25), S.755-764 |
| Datensatznummer |
250019030
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| Publikation (Nr.) |
 copernicus.org/angeo-31-755-2013.pdf |
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| Zusammenfassung |
| Observations of the ozone profile by a ground-based microwave
radiometer in Switzerland indicate a dominant 20-day oscillation in
stratospheric ozone, possibly related to oscillations of the polar vortex
edge during winter. For further understanding of the nature of the 20-day
oscillation, the ozone data set of ERA Interim meteorological reanalysis is
analyzed at the latitude belt of 47.5° N and in the time from 1979 to
2010. Spectral analysis of ozone time series at 7 hPa indicates that the
20-day oscillation is maximal at two locations: 7.5° E,
47.5° N and 60° E, 47.5° N. Composites of the stream
function are derived for different phases of the 20-day oscillation of
stratospheric ozone at 7 hPa in the Northern Hemisphere. The streamline at
Ψ = −2 × 107 m2 s−1 is in the vicinity of the polar vortex
edge. The other streamline at Ψ = 4 × 107 m2 s1 surrounds the
Aleutian anticyclone and goes to the subtropics. The composites show 20-day
period standing oscillations at the polar vortex edge and in the subtropics
above Northern Africa, India, and China. The 20-day period standing
oscillation above Aral Sea and India is correlated to the strength of the
Aleutian anticyclone. |
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