Observational evidence of local turbulence production due to gravity wave saturation in the summer mesosphere

Details Observational evidence of local turbulence production due to gravity wave saturation in the summer mesosphere Observational evidence of local turbulence production due to gravity wave saturation in the summer mesosphere

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..143w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 143-151.

Physics

3

Atmospheric Physics, Atmospheric Turbulence, Gravity Waves, Mesosphere, Summer, Energy Dissipation, Richardson Number, Wind Shear, Winds Aloft

Scientific paper

Five foil chaff and two falling sphere rockets were flown during the MAC/SINE Campaign on July 15, 1987 at Andenes, Northern Norway. From these rocket measurements, turbulent energy dissipation rates, vertical wind shears and Richardson numbers as functions of height were derived in the range from 82 to 92 km. Turbulent energy dissipation rates generally range from 1.4 x 10 exp -5 to 0.02 W/kg and are consistent with other experiments performed at the same latitude. Strong wind shears of the order of 50-90 m/s/km are observed at various heights. Good correspondence between turbulence intensity peaks, regions of strong wind shear and low Richardson number is found. Vertical wavenumber spectra of the five scalar winds measured by the foil chaff rockets indicate that there is an excellent agreement with the saturation hypothesis, suggesting that the turbulence intensity peaks measured in this salvo are linked directly to the saturation of gravity wave motions via dynamical instabilities.

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