Articles | Volume 8, issue 24
Atmos. Chem. Phys., 8, 7557–7570, 2008
Atmos. Chem. Phys., 8, 7557–7570, 2008

  17 Dec 2008

17 Dec 2008

Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the southern summer hemisphere

M. G. Shepherd1 and T. Tsuda2 M. G. Shepherd and T. Tsuda
  • 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 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.

Final-revised paper