Short period fluctuations of the horizontal wind measured in the upper middle atmosphere and possible relationships to internal gravity waves

Details Short period fluctuations of the horizontal wind measured in the upper middle atmosphere and possible relationships to internal gravity waves Short period fluctuations of the horizontal wind measured in the upper middle atmosphere and possible relationships to internal gravity waves

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..385e&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, April 1987, p. 385-401. Research sponsored by the Depa

Physics

37

Gravity Waves, Internal Waves, Middle Atmosphere, Periodic Variations, Wind (Meteorology), Atmospheric Circulation, Atmospheric Models, Perturbation Theory, Scale Height, Wave Propagation

Scientific paper

Horizontal wind fluctuations between heights of 61 and 105 km, obtained from MF radar measurements at Saskatoon, are found to exhibit properties characteristic of a transient internal gravity wave field having experienced directional filtering after traversing the troposphere and the lower middle atmosphere. The pronounced N-S anisotropy of the fluctuations suggests that the perturbations are mainly generated by vertically propagating gravity waves. Seasonal changes of gravity wave source strength and distribution are noted. The shorter and longer period fluctuation intensities show significant differences in their seasonal variation in the mesosphere, and eddy dissipation rates estimated from horizontal wind fluctuations also exhibit changes with height and season.

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