Articles | Volume 33, issue 4
Regular paper
29 Apr 2015
Regular paper |  | 29 Apr 2015

Driving of the SAO by gravity waves as observed from satellite

M. Ern, P. Preusse, and M. Riese

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The forcings of the semiannual oscillation (SAO) of the tropical zonal wind in the stratopause region are investigated based on ERA-Interim reanalysis and HIRDLS satellite observations. In particular, the SAO driving by mesoscale gravity waves is estimated directly from satellite observations of gravity waves. Our study confirms previous indirect evidence that planetary waves dominate during the westward driving of the SAO, while gravity waves mainly provide eastward forcing.