[U04-05] GNSS Total Electronics Contents tsunami measurements and tsunami height inversions.
Keywords:tsunami, ionosphere, TEC
We review first the state of the art of observations, for both ground based GNSS networks and space GNSS occultations (e.g., COSMIC), as well as the efficiency in the to reproduce the tsunami sisgnature in the ionosphere. Numerical modeling are shown with various technics, such as tsunami normal modes summation or spectral elements methods, compared to data and then used to estimate the sea-level height waveform, with excellent waveform matching compared to those recorded by DARTs.
We present observations and modeling close to the epicenter –where the ionospheric TEC perturbation is visible at 7 minutes after the rupture- in order to estimate the tsunami risk; as well as in the far-fiel, off-shore, where we show that the TEC measurement can strongly support the tsunami high estimation during oceanic propagation. We discuss also the impact of the ionospheric dynamics in the signal to noise ratio. We finally conclude by the perspectives offered by TEC measurements in the improvements of oceanic monitoring and tsunami warning systems.