[A-AS01] 大気の鉛直運動を基軸とした地球環境学の新展開

[AAS01-05] 昭和基地上空で観測された地形性重力波の再現実験：対流圏・下部成層圏の重力波伝播・砕波

★招待講演

*高麗 正史¹、佐藤 薫¹、Fritts David²、Lund Thomas² (1.東京大学大学院理学系研究科地球惑星科学専攻、2.GATS)

キーワード：大気重力波、乱流、ハイドローリックジャンプ、LES、大型大気レーダー

A numerical simulation for gravity waves (GW) observed over Syowa Station on 18 May 2021 is performed using a model with a horizontal/vertical resolution of 250/60 m. The realistic topography and background horizontal winds and temperatures were used in the experiment. The amplitudes of GW fluctuations and momentum flux associated with GW in the lower stratosphere are comparable to those from radar observations. The simulation also shows several interesting aspects of GW including ship-wave pattern resulting from small mountains, GW filtering effect for different horizontal wavenumber vector orientations, turbulence generation around the critical level, surface turbulent wake downwind of a hydraulic jump, and GW radiation from the edge of the turbulent wake.