Atmos. Chem. Phys. Discuss., 8, 16409-16444, 2008
www.atmos-chem-phys-discuss.net/8/16409/2008/
doi:10.5194/acpd-8-16409-2008
© Author(s) 2008. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the Southern Summer Hemisphere
M. G. Shepherd1 and T. Tsuda2
1Centre for Research in Earth and Space Science, York University, Toronto, Canada
2Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan

Abstract. The global structure and propagation of large-scale (periods >5 days) waves in the Southern Hemisphere summer (December 2006–February 2007) at 60° S–75° S latitude are examined using temperature data from GPS radio occultation measurements by COSMIC/FORMOSAT 3 satellite constellation from 10 to 40 km altitude. Spectral analysis has revealed eastward propagating planetary scale perturbations with wavenumbers 1 and 2 and periods of 10-, 16- and 23 days, zonally symmetric waves with the same periods and stationary waves with wavenumber 1 and 2. The presence of the zonally symmetric waves is interpreted as an indication of the coupling of the stationary and traveling waves. The results obtained show a very dynamically active Antarctic summer stratosphere. The novel aspect of the work is in the use of the GPS COSMIC data providing multiple local times each day, thus allowing large-scale wave analysis at high Southern latitudes and revealing planetary wave activity not normally observed in summer, but more consistent with late winter and spring conditions in the stratosphere.

Citation: Shepherd, M. G. and Tsuda, T.: Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the Southern Summer Hemisphere, Atmos. Chem. Phys. Discuss., 8, 16409-16444, doi:10.5194/acpd-8-16409-2008, 2008.
 
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