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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 4
Ann. Geophys., 32, 443–447, 2014
https://doi.org/10.5194/angeo-32-443-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: C/NOFS results and equatorial ionospheric dynamics

Ann. Geophys., 32, 443–447, 2014
https://doi.org/10.5194/angeo-32-443-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 24 Apr 2014

Regular paper | 24 Apr 2014

Simulation of non-hydrostatic gravity wave propagation in the upper atmosphere

Y. Deng1 and A. J. Ridley2 Y. Deng and A. J. Ridley
  • 1Department of Physics, University of Texas at Arlington, Arlington, Texas, USA
  • 2Department of AOSS, University of Michigan, Ann Arbor, Michigan, USA

Abstract. The high-frequency and small horizontal scale gravity waves may be reflected and ducted in non-hydrostatic simulations, but usually propagate vertically in hydrostatic models. To examine gravity wave propagation, a preliminary study has been conducted with a global ionosphere–thermosphere model (GITM), which is a non-hydrostatic general circulation model for the upper atmosphere. GITM has been run regionally with a horizontal resolution of 0.2° long × 0.2° lat to resolve the gravity wave with wavelength of 250 km. A cosine wave oscillation with amplitude of 30 m s−1 has been applied to the zonal wind at the low boundary, and both high-frequency and low-frequency waves have been tested. In the high-frequency case, the gravity wave stays below 200 km, which indicates that the wave is reflected or ducted in propagation. The results are consistent with the theoretical analysis from the dispersion relationship when the wavelength is larger than the cutoff wavelength for the non-hydrostatic situation. However, the low-frequency wave propagates to the high altitudes during the whole simulation period, and the amplitude increases with height. This study shows that the non-hydrostatic model successfully reproduces the high-frequency gravity wave dissipation.

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