Propagation of tsunami-induced acoustic-gravity waves in the atmosphere

A dynamical core of an atmospheric GCM is utilized for assessing the qualitative picture of propagation of atmospheric acoustic-gravity waves in response to perturbations generated by tsunami waves at the surface. Both resting isothermal atmosphere and modelgenerated atmosphere with realistic stratification and circulation features were considered. Shallow water tsunami model was run in two different configurations: ocean of equal depth
of 4 km and ocean with realistic continents and bottom topography. Amplitude and timing of atmospheric response is analyzed as a function of vertical stratification and configuration of atmospheric jets. This approach has a potential for early tsunami detection by measuring changes in electric properties of the upper atmosphere in response to acoustic-gravity waves generated by tsunami.

本研究借助大气环流模式（General Circulation Model，GCM）的动力核心，对海面海啸扰动诱发的大气声重力波（acoustic-gravity waves）传播的定性特征展开评估。研究中同时考虑了两类大气环境：静止等温大气，以及具备真实层结与环流特征的模式生成大气。本研究采用两种不同配置运行浅海海啸模型：其一为水深均一的4千米大洋，其二为包含真实大陆与海底地形的大洋。随后围绕大气响应的振幅与时序特征，分析其与大气垂直层结、急流配置的依赖关系。该方法具备早期海啸探测潜力，可通过测量海啸引发声重力波所导致的高层大气电学特性变化，实现海啸早期预警。