Vertical propagation characteristics of internal gravity waves around the mesopause observed by the Arecibo UHF radar

Details Vertical propagation characteristics of internal gravity waves around the mesopause observed by the Arecibo UHF radar Vertical propagation characteristics of internal gravity waves around the mesopause observed by the Arecibo UHF radar

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49...73m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Jan. 1987, p. 73-80. Research supported by the Nissan

Physics

4

Gravity Waves, Internal Waves, Mesopause, Radar Data, Amplitudes, Atmospheric Circulation, Atmospheric Models, Puerto Rico, Summer, Wave Propagation, Zonal Flow (Meteorology)

Scientific paper

A high resolution wind observation of the mesosphere and lower thermosphere (73-95 km) was conducted with the aid of the high power UHF Doppler radar at Arecibo (18.4 deg N, 66.8 deg W). Zonal wind velocities were continuously observed during day-time hours on Aug. 1-15, 1980. The observed wind fluctuations with periods of 1-4 h are discussed in the light of internal gravity waves. The phase propagation associated with these fluctuations is, on average, shown to be downward, indicating an upward energy flux. A space-time spectral analysis shows that waves with vertical wavelengths shorter than 10 km disappear around the mesopause (about 85 km), while those with longer vertical wavelengths exist throughout the observational height. This result is explained in terms of wave absorption at a critical layer where the mean zonal wind has a westerly shear with height. This feature is consistent with the behavior required for internal gravity waves around the summer mesopause in order to explain general circulation models.

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