Enhancements of gravity wave amplitudes at midlatitudes during sudden stratospheric warmings in 2008 T. Flury1,3, K. Hocke1,2, N. Kämpfer1,2, and D. L. Wu3 1Institute of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland 2Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Received: 12 August 2010 – Accepted: 28 November 2010 – Published: 09 December 2010
Abstract. Two minor and one major stratospheric warming happened in January and
February 2008 when the polar vortex was shifted toward midlatitudes. The
analysis of temperature profiles from radiosondes in Payerne (Switzerland)
during this period reveals an enhancement of gravity wave amplitudes between
25 and 30 km altitude especially during the two minor warmings around
20 January and 1 February. Increases of gravity wave amplitudes in the
mid-stratosphere are associated with a strong tropopause jet and the presence
of the polar vortex edge over Switzerland.
Citation: Flury, T., Hocke, K., Kämpfer, N., and Wu, D. L.: Enhancements of gravity wave amplitudes at midlatitudes during sudden stratospheric warmings in 2008, Atmos. Chem. Phys. Discuss., 10, 29971-29995, doi:10.5194/acpd-10-29971-2010, 2010.