Diurnal variations in the rate of dissipation of turbulent energy in the equatorial upper mesosphere-lower thermosphere

Details Diurnal variations in the rate of dissipation of turbulent energy in the equatorial upper mesosphere-lower thermosphere Diurnal variations in the rate of dissipation of turbulent energy in the equatorial upper mesosphere-lower thermosphere

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rasc...40.4010r&link_type=abstract

Radio Science, Volume 40, Issue 4, CiteID RS4010

Computer Science

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Turbulence (4490), Atmospheric Processes: Acoustic-Gravity Waves, Atmospheric Processes: Tides And Planetary Waves

Scientific paper

The diurnal variation of the rate of dissipation of turbulent energy over Arecibo (18°N, 67°W) for the 1989 Arecibo Initiative on Dynamics of the Atmosphere (AIDA '89) campaigns from 1-10 April and 2-9 May 1989 have been estimated using the random velocity field deduced from imaging Doppler interferometry data. A method for extraction of the vertical component of the gravity wave spectrum has been applied to the random velocity. There is a tendency for the turbulence to maximize at dawn and dusk. Estimates of the RMS vertical gravity wave component range from 2 to 5 m s-1, and estimates of the RMS turbulent energy range from 5 to 100 mW kg-1. Estimates of the vertical eddy diffusivity have also been calculated, ranging from <50 to 300 m2 s-1. The buoyancy scale ranges from <100 m to 1 km. A cautionary note is added regarding the applicability of the Kolmogorov theory above 100 km.

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