Space-time Fourier Models of Three-Dimensional Gravity-Wave Evolution from Tropospheric Sources into the Deep Thermosphere
Abstract
We review and test a suite of new three-dimensional Fourier models designed to capture the vertical evolution of three-dimensional gravity-wave fields radiated from tropospheric sources and propagating within arbitrary vertically-varying background atmospheres extending deep into the thermosphere. These models are based around viscous gravity-wave dispersion relations, and adopt either Fourier-ray or Fourier-multilayer methods to derive numerical solutions. Among several innovative aspects, the models' general lower boundary condition allows them to be initialized using gravity-wave-induced stratospheric vertical velocity fields generated by regional numerical weather prediction (NWP) model forecasts of gravity waves emanating from forecast weather-related sources, such as flow over complex terrain, or deep tropospheric convection. We use the models so initialized to evolve forecast wavefields to much higher altitudes. We apply these models to specific idealized and real-world deep gravity-wave problems, in particular exploring the potential use of the thermospheric gravity-wave solutions as input drivers to physics-based ionospheric models to study or even predict traveling ionospheric disturbances seeded by deep gravity waves originating from tropospheric weather events.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSA23B3109E
- Keywords:
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- 3334 Middle atmosphere dynamics;
- ATMOSPHERIC PROCESSES;
- 3337 Global climate models;
- ATMOSPHERIC PROCESSES;
- 3360 Remote sensing;
- ATMOSPHERIC PROCESSES;
- 3384 Acoustic-gravity waves;
- ATMOSPHERIC PROCESSES