Lagrangean transport due to internal gravity waves simulated by a non-hydrostatic and compressible 2D numerical model

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Scientific paper

Lagrangean transport due to internal gravity waves (IGWs), propagating throughout the middle atmosphere and generated by a localized tropospheric dry convection system, is reported using a non-hydrostatic, compressible and nonlinear two-dimensional numerical model. It is shown that (1) vertical displacement depth of isentropic surfaces in the upper middle atmosphere becomes of the order of several km because of the exponential growth of the amplitudes of IGWs with height, and (2) irreversible vertical displacement of the order of several km occurred due to mixing when the IGWs break down. This numerical simulation suggests that IGWs generated in the troposphere can contribute to vertical transport and mixing of materials in the upper middle atmosphere.

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