JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM11] [EE] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

2017年5月24日(水) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:Chang Loren(Institute of Space Science, National Central University)、Liu Huixin(九州大学理学研究院地球惑星科学専攻 九州大学宙空環境研究センター)、齊藤 昭則(京都大学大学院理学研究科地球物理学教室)、Tzu-Wei Fang

[PEM11-P10] Fine Structure Interactions with Gravity Waves in the Mesosphere and Lower Thermosphere

*Tyler Mixa1,2David Fritts2Katrina Bossert2Brian Laughman2Ling Wang2Thomas Lund3Lakshmi Kantha1 (1.University of Colorado Boulder, CO, USA、2.GATS-inc Boulder, CO, USA、3.NorthWest Research Associates Boulder, CO, USA)

キーワード:Gravity Wave, Wave Mean-Flow Interactions, Mesosphere and Lower Thermosphere

An anelastic numerical model is used to characterize the influences of fine layer structures on gravity wave propagation in the Mesosphere and Lower Thermosphere (MLT). Recent lidar observations identify persistent layering structures in the MLT that have sharp stratification and vertical scales below 1 km. Gravity waves propagating through finely layered environments can trigger the evolution of small scale instabilities that significantly enhance the layering in these regions. Such layers in turn promote ducting or reflection, hasten the onset of self-acceleration dynamics, encourage wave/mean-flow interactions, and filter the outgoing wave spectra, defining the wave's influence as it propagates to higher altitudes. Using high resolution simulations of a localized gravity wave packet in a deep atmosphere, we identify the impacts of various wave and mean flow parameters to determine the major mechanisms driving these dynamics and complement recent state-of-the-art observations.