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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-1023
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 17 Oct 2018

Research article | 17 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

A study of the dynamical characteristics of inertia–gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model

Ryosuke Shibuya1 and Kaoru Sato2 Ryosuke Shibuya and Kaoru Sato
  • 1Japan Agency for Marine -Earth Science and Technology, Yokohama, Japan
  • 2Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan

Abstract. The first long-term simulation using the high-top non-hydrostatic general circulation model (NICAM) was executed to analyze mesospheric gravity waves in the period from April to August in 2016. Successive runs lasting 7 days are performed using initial conditions from the MERRA reanalysis data with an overlap of 2 days between consecutive runs. The data for the analyses were compiled from the last 5 days of each run. The simulated wind fields were closely compared to the MERRA reanalysis data and to the observational data collected by a complete PANSY (Program of the Antarctic Syowa MST/IS Radar) radar system installed at Syowa Station (39.6°E 69.0°S). It is shown that the NICAM mesospheric wind fields are realistic, even though the amplitudes of the wind disturbances appear to be larger than the radar observations.

The power spectrum of the meridional wind fluctuations at a height of 70km has an isolated and broad peak at frequencies slightly lower than the inertial frequency, f, for latitudes from 30°S to 75°S, while another isolated peak is observed at frequencies of approximately 2π/8h at latitudes from 78°S to 90°S. The spectrum of the vertical fluxes of the zonal momentum also has an isolated peak at frequencies slightly lower than f at latitudes from 30°S to 75°S at a height of 70km. It is shown that these isolated peaks are primarily composed of gravity waves with horizontal wavelengths of more than 1000km. The latitude–height structure of the momentum fluxes indicates that the isolated peaks at frequencies slightly lower than f originate from two branches of gravity wave propagation paths. It is thought that one branch originates from 75°S due to topographic gravity waves generated over the Antarctic Peninsula and its coast, while more than 80% of the other branch originates from 45°S and includes contributions by non-orographic gravity waves. The existence of isolated peaks in the high-latitude region in the mesosphere is likely explained by the poleward propagation of quasi-inertia–gravity waves and by the accumulation of wave energies near the inertial frequency at each latitude.

Ryosuke Shibuya and Kaoru Sato
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Ryosuke Shibuya and Kaoru Sato
Ryosuke Shibuya and Kaoru Sato
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Short summary
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 this paper 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° S to 75° S at a height of 70 km. This study discusses the physical mechanism for an explanation of the existence of the isolated spectrum peak in the mesosphere.
The first long-term simulation using the high-top non-hydrostatic general circulation model...
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