Summary and Concluding Remarks

Part of the Springer Theses book series (Springer Theses)


In this chapter, the main results revealed by the combination of the PANSY radar observation and a long-term simulation using the high-top non-hydrostatic general circulation model, which are closely described in Sections 2 and 3 are summarized. In Section 2, it was shown that, during the first observations made by a complete PANSY radar system (Program of the Antarctic Syowa MST/IS radar) installed at Syowa Station from 16 to 24 March 2015, quasi-12 h period disturbances in the mesosphere at heights of 70 to 80 km were observed. Combining the observational data and numerical simulation outputs, we found that quasi-12 h disturbances are due to large-scale inertia–gravity waves, not to semi-diurnal migrating tides. In Section 3, the first long-term simulation using the high-top non-hydrostatic general circulation model (NICAM) was executed to analyze mesospheric gravity waves. A new finding in Section 3 is that the spectrum of the vertical fluxes of the zonal momentum has an isolated peak at frequencies slightly lower than f at latitudes from 30 to 75° S at a height of 70 km. Section 3 also discusses the physical mechanism for an explanation of the existence of the isolated spectrum peak in the mesosphere. Last, a possible future study is shortly mentioned.


Gravity wave Numerical simulation High resolution observation Dynamics 


  1. 1.
    López-Valverde, M. A., Edwards, D. P., López-Puertas, M., & Roldán, C. (1998). Non-local thermodynamic equilibrium in general circulation models of the Martian atmosphere 1. Effects of the local thermodynamic equilibrium approximation on thermal cooling and solar heating. Journal of Geophysical Research: Planets, 103(E7), 16799–16811.
  2. 2.
    Murphy, D. J. (2006). A climatology of tides in the Antarctic mesosphere and lower thermosphere. Journal of Geophysical Research: Atmospheres, 111.
  3. 3.
    Plougonven, R., Hertzog, A., & Guez, L. (2013). Gravity waves over Antarctica and the Southern Ocean: Consistent momentum fluxes in mesoscale simulations and stratospheric balloon observations. Quarterly Journal of the Royal Meteorological Society, 139, 101–118.ADSCrossRefGoogle Scholar
  4. 4.
    Sato, K., Kohma, M., Tsutsumi, M., & Sato, T. (2017). Frequency spectra and vertical profiles of wind fluctuations in the summer Antarctic mesosphere revealed by MST radar observations. Journal of Geophysical Research: Atmospheres, 122(1), 3–19.ADSGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan

Personalised recommendations