Some further results on long term mesospheric and lower thermospheric wind observations by the Arecibo UHF radar

Details Some further results on long term mesospheric and lower thermospheric wind observations by the Arecibo UHF radar Some further results on long term mesospheric and lower thermospheric wind observations by the Arecibo UHF radar

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49...63m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Jan. 1987, p. 63-71. Research supported by the Nissan

Physics

5

Mesosphere, Radar Data, Thermosphere, Wind Profiles, Geopotential Height, Gravity Waves, Planetary Waves, Puerto Rico, Stratosphere, Ultrahigh Frequencies, Wave Propagation, Wind Variations, Wind Velocity

Scientific paper

A second series of long term mesospheric and lower thermospheric wind observations was conducted at Arecibo (18.4 deg N, 66.8 deg W) between Mar. 6-20, 1981, using the UHF Doppler radar, following the first observations in August 1980 (Hirota et al., 1983). Zonal and meridional wind velocities were measured during the morning (8-10 LT) and afternoon (13-15 LT) periods. The mean wind profile averaged over the entire observational period shows the predominance of the diurnal tide. The fluctuating wind vector rotates clockwise relative to height with a characteristic vertical scale of about 10 km. The phase difference inferred by a cross correlation analysis between morning and afternoon profiles indicates that the dominant period is about 20-30 h. This oscillation is discussed in relation to internal inertia-gravity waves observed by the same radar in the lower stratosphere. On the other hand a wind fluctuation with a vertical scale larger than 20 km shows a substantial day-to-day variation with a period of 5-8 days. This long period oscillation shows a good correlation with the global scale geopotential height anomalies at 1 mb (46-48 km) observed by the Tiros-N satellite at 20 deg N. The evidence suggests that westward traveling planetary-scale waves with zonal wavenumber one may propagate up to the lower thermosphere.

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