Tidal coupling with the lower atmosphere (invited review)

Physics

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Atmospheric Composition, Atmospheric Tides, Diurnal Variations, Lower Atmosphere, Thermodynamic Coupling, Vertical Orientation, Atmospheric Temperature, Energy Budgets, Insolation, Mesosphere, Ozone, Solar Wind, Thermosphere, Water Vapor

Scientific paper

The various ways are reviewed in which propagating tidal components excited in the mesophere and below affect the structure of the thermosphere and ionosphere above 100 km. Dynamo effects are not treated here. The physical processes affecting the propagation of upward propagating tides are examined and how they are interrelated in the context of a numerical model. Propagating diurnal and semidiurnal tides which reach thermospheric heights are excited primarily by insolation absorption by tropospheric water vapor (0 to 5 km) and stratospheric/mesospheric ozone (40 to 60 km), respectively. Simulation of these oscillations requires consideration of mean zonal winds and meridional temperature gradients, and the damping effects of turbulent and molecular dissipation, radiative cooling, and ion drag. These effects must be considered on a spherical rotating atmosphere extending from the ground to above 300 km, as they are in the model developed by Forbes depicted schematically.

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