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A 20-day period standing oscillation in the northern winter stratosphere

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Hocke K., Studer S., Martius O., Scheiben D., Kämpfer N.,
Project Detection and Interpretation of Atmospheric Motions (DIAMO)
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Original article (peer-reviewed)

Journal Annales Geophysicae
Volume (Issue) 31
Page(s) 755 - 764
Title of proceedings Annales Geophysicae
DOI 10.5194/angeo-31-755-2013

Open Access

URL http://www.ann-geophys.net/31/755/2013/
Type of Open Access Publisher (Gold Open Access)

Abstract

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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