Gravity-wave motions in the mesosphere

Details Gravity-wave motions in the mesosphere Gravity-wave motions in the mesosphere

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..119v&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Feb. 1984, p. 119-128. Research supported by the Austr

Physics

133

Atmospheric Circulation, Gravity Waves, Mesosphere, Wave Propagation, Energy Budgets, Meridional Flow, Turbulent Diffusion, Vertical Air Currents, Wave Reflection, Wind Velocity

Scientific paper

Partial reflection measurements of horizontal winds in the mesosphere and lower thermosphere made at Adelaide (35 S, 138 E) and Townsville (19 S, 147 E) have been spectrally analyzed as functions of frequency and wavenumber. The spectral densities of gravity wave motions observed at 85 km are found to follow a power law relation of a certain form. The functional form of the frequency spectra and the inferred rms amplitudes agree well with other reported observations, which suggests there is some 'universality' to the gravity wave field in the mesosphere. A vector spectral decomposition of gravity wave wind vs height profiles shows that at least 65 percent of the vertical energy flux of long period gravity waves is upgoing. The estimated vertical energy flux at the mesopause is about 0.01 W/sq m, a large fraction of which appears to be carried by the short period waves.

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