Articles | Volume 21, issue 18
https://doi.org/10.5194/acp-21-13763-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-13763-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Sep 2021
Research article |
| 16 Sep 2021
| 16 Sep 2021
The semiannual oscillation (SAO) in the tropical middle atmosphere and its gravity wave driving in reanalyses and satellite observations
Institut für Energie- und Klimaforschung – Stratosphäre (IEK-7), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Mohamadou Diallo
Institut für Energie- und Klimaforschung – Stratosphäre (IEK-7), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Peter Preusse
Institut für Energie- und Klimaforschung – Stratosphäre (IEK-7), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Martin G. Mlynczak
NASA Langley Research Center, Hampton, Virginia, USA
Michael J. Schwartz
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
National Center for Atmospheric Research, High Altitude Observatory, Boulder, Colorado, USA
Martin Riese
Institut für Energie- und Klimaforschung – Stratosphäre (IEK-7), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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Latest update: 23 Mar 2025
Short summary
Details of the driving of the semiannual oscillation (SAO) of the tropical winds in the middle atmosphere are still not known. We investigate the SAO and its driving by small-scale gravity waves (GWs) using satellite data and different reanalyses. In a large altitude range, GWs mainly drive the SAO westerlies, but in the upper mesosphere GWs seem to drive both SAO easterlies and westerlies. Reanalyses reproduce some features of the SAO but are limited by model-inherent damping at upper levels.
Details of the driving of the semiannual oscillation (SAO) of the tropical winds in the middle...
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