Abstract: Thunderstorms play an important role in the upward transport of momentum, energy, and trace chemical species from the surface to upper levels of the atmosphere, however, the mechanism of transporting trace species from the troposphere to the stratosphere is less understood. In this paper we analyzed the dynamics of gravity waves near the top of a simulated storm and showed that the breaking of internal gravity waves excited by the deep convection at the storm top level can transport trace species such as water substance across the tropopause. Very high intensity gravity waves are generated with significant amplitudes during the convective storm at the storm top level. Amplitudes decreased at breakdown region at z = ~12 km where critical layer is formed and regained its intensity after wave breaking. The vertical wavelengths also started decreasing at about 12 km where the breakdown region is observed. Lower Richardson number values confirms the generation of turbulence after breaking down of these waves with enhanced wind shear instabilities near upper tropopause regions. Wind speed matched well with the wave speed at critical levels when the breaking occurs. The signatures of transport of water vapor are clearly seen above tropopause and reach as high as ~15 km.
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