ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-7557-2008 Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the southern summer hemisphere Shepherd M. G. 1 Tsuda T. 2 Centre for Research in Earth and Space Science, York University, Toronto, Canada Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan 17 12 2008 8 24 7557 7570 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/7557/2008/acp-8-7557-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/7557/2008/acp-8-7557-2008.pdf

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 at 20 km and 30 km altitude. Spectral analysis has revealed eastward propagating planetary scale perturbations with wavenumbers 1 and 2 and periods of 10, 16 and 23 days, and stationary waves with wavenumbers 1 and 2. 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.

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