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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 4
Ann. Geophys., 33, 483–504, 2015
https://doi.org/10.5194/angeo-33-483-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 33, 483–504, 2015
https://doi.org/10.5194/angeo-33-483-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 29 Apr 2015

Regular paper | 29 Apr 2015

Driving of the SAO by gravity waves as observed from satellite

M. Ern et al.

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Short summary
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.
The forcings of the semiannual oscillation (SAO) of the tropical zonal wind in the stratopause...
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