The meteorological jet stream as a source of medium scale gravity waves in the thermosphere - An experimental study

Details The meteorological jet stream as a source of medium scale gravity waves in the thermosphere - An experimental study The meteorological jet stream as a source of medium scale gravity waves in the thermosphere - An experimental study

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1161b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Oct.-Nov. 1978, p. 1161-1183.

Physics

18

Atmospheric Energy Sources, Gravity Waves, Jet Streams (Meteorology), Thermosphere, Wave Propagation, Europe, Incoherent Scattering, Ray Tracing, Shear Flow, Synchronous Satellites, Troposphere, Vertical Distribution, Wave Generation, Wind Variations

Scientific paper

Results are reported of a coordinated experimental study of medium scale gravity waves involving use of a multistatic incoherent scatter system together with two networks of polarimeters monitoring transmissions from a geostationary satellite during a six-day period in July 1974. A reverse ray tracing analysis, through the atmosphere, for each gravity wave is described and its validity and accuracy discussed in detail. For the majority of the waves the reverse group path can be followed down to tropopause level and comparison with meteorological data has shown that many of the possible source regions of the observed waves appear to lie in proximity to the jet stream, with some evidence to suggest a preference for the polar side of the jet. Other wave sources are found to be close to regions of convectively unstable cold polar air. Wave energetics are discussed together with possible generation mechanisms, the latter in the form of nonlinear interaction of shear flow instabilities in the jet stream and penetrative convection.

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