Morphology and sources of turbulence in the mesosphere during DYANA

Details Morphology and sources of turbulence in the mesosphere during DYANA Morphology and sources of turbulence in the mesosphere during DYANA

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56.1809l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 13-14, p. 1,809-1,833

Computer Science

Sound

9

Atmospheric Turbulence, Ion Density (Concentration), Mesosphere, Morphology, Turbulent Diffusion, Energy Dissipation, Richardson Number, Sounding Rockets

Scientific paper

During the DYnamics Adapted Network for the Atmosphere (DYANA) campaign in early 1990 turbulent parameters were measured at various places by means of in situ and ground supported techniques. Rocket borne instruments detected small-scale fluctuations of neutral (TOTAL instrument) and ion (PIP instrument) number densities in the mesosphere and lower thermosphere. A total of six flights was successfully performed in Andoya (69 deg N) and two in Biscarosse (44 deg N). Altitude profiles of turbulent parameters, such as turbulent energy dissipation rates epsilon and turbulent diffusion coefficients Kappa were derived from the fluctuations. Thanks to improvements in the instrumental capabilities, the reliability of the absolute values is unprecedented. The mean turbulent energy dissipation rates measured both by TOTAL and PIP in Andoya show very low values (less than 1 mW/kg) in the lower mesosphere, increasing to approximately 10 W/kg in the upper mesosphere. The corresponding heating rates are approximately 0.05 and 1 K/day, respectively. The two flights performed in Biscarosse showed similar low values. In addition to the in situ measurements, energy dissipation rates were measured around 75 km by the chaff dispersion technique at Heiss Island (81 deg N) and at Volgograd (48 deg N). Much higher epsilon values were observed (typically 100 mW/kg) using this procedure than those values obtained by in situ measurements.

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