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

• Published in: Atmospheric Chemistry and Physics
• Main Authors: Shepherd, M. G., Tsuda, T.
• Format: Text
• Language: English
• Published: 2018
• Subjects: Antarctic; Antarc*
• Online Access: https://doi.org/10.5194/acp-8-7557-2008; https://www.atmos-chem-phys.net/8/7557/2008/

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.