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

Hocke, Klemens; Studer, S.; Martius, Olivia; Scheiben, Dominik; Kämpfer, Niklaus (2013). A 20-day period standing oscillation in the northern winter stratosphere. Annales geophysicae, 31(4), pp. 755-764. Gauthier-Villars 10.5194/angeo-31-755-2013

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Impact
08 Faculty of Science > Institute of Applied Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Hocke, Klemens; Romppainen-Martius, Olivia; Scheiben, Dominik and Kämpfer, Niklaus

Subjects:

500 Science > 550 Earth sciences & geology
600 Technology > 620 Engineering
900 History > 910 Geography & travel

ISSN:

0992-7689

Publisher:

Gauthier-Villars

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

19 Jun 2014 08:18

Last Modified:

14 Aug 2015 13:17

Publisher DOI:

10.5194/angeo-31-755-2013

BORIS DOI:

10.7892/boris.43223

URI:

https://boris.unibe.ch/id/eprint/43223

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