Excitation and propagation of middle atmospheric internal gravity waves in a general circulation model

Physics

Scientific paper

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Atmospheric Circulation, Atmospheric Models, Gravity Waves, Middle Atmosphere, Wave Propagation, Climatology, Orography, Wind Shear, Winter

Scientific paper

An analysis of the internal gravity waves (IGWs) produced in a general circulation model of the middle atmosphere for nondiurnal January conditions is presented, illustrating the intermittancy and variability of these waves. IGWs were most readily detected by the vertical velocities, with the meridional velocity exhibiting the next clearest response to IGW, although only above 60 km. In the troposphere, vertical velocities were dominated by very high temporal frequencies which varied with height, with periods of 2-6 h predominating in the lower thermosphere. Predicted vertical fluxes of energy and momentum were much less than those observed, indicating the need to parameterize these terms in the present model.

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