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

摘要: Abstract. This study aims to examine the dynamical characteristics of gravity waves with relatively low frequency in Antarctic mesosphere via first long-term simulation using a high-top high-resolution non-hydrostatic general circulation model (NICAM). Successive runs lasting 7 days are performed using initial conditions from MERRA reanalysis data with an overlap 2 days between consecutive period April August 2016. The data for analyses were compiled last 5 days each run. The simulated wind fields closely compared and to observational collected by complete PANSY (Program the Antarctic Syowa MST/IS radar) radar system installed at Station (39.6 ∘  E, 69.0  S). It is shown that NICAM mesospheric wind realistic, even though amplitudes wind disturbances appear be larger than those observations. power spectrum meridional fluctuations height 70 km has isolated and broad peak frequencies slightly lower the inertial frequency, f , for latitudes 30 75  S, while another observed approximately 2 π∕8  h 78 90  S. The spectrum vertical fluxes zonal momentum also has isolated peak  S 70 km. these isolated peaks primarily composed waves horizontal wavelengths of more 1000 km. latitude–height structure fluxes indicates peaks originate two branches wave propagation paths. thought that one branch originates due topographic gravity waves generated over Peninsula its coast, more than 80 % other 45 includes contributions non-orographic waves. existence high-latitude region likely explained by the poleward quasi-inertia–gravity the accumulation energies near inertial latitude.