In-Situ Turbulence Measurements in the High-Latitude MLT-Region

Details In-Situ Turbulence Measurements in the High-Latitude MLT-Region In-Situ Turbulence Measurements in the High-Latitude MLT-Region

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa54a..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA54A-05

Computer Science

Sound

0300 Atmospheric Composition And Structure, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition (3334)

Scientific paper

Since the beginning of the nineties our research group has launched a total of 40 sounding rockets carrying ionization gauges for the high resolution measurement of neutral density fluctuations. These fluctuations are a suitable tracer for turbulent velocity fluctuations. Since such measurements are made at very high spatial resolution (< 1 m) they can be used to derive the spectral content of the turbulence field from which in turn the turbulent energy dissipation rate can be reliably derived. After a short introductuction to the instrumental and analysis technique we will present mean results of the seasonal and geographical variation of turbulence at high northern latitudes, insights into the mechanism of wave mean flow interaction, and discuss selected instability events. We will further show that modern analysis techniques using wavelet transforms enable us to characterize the actual vertical extent of turbulence layers which can be extremely narrow (order of 100 m). From our measurements we can also tentatively characterize the statistics of turbulence in the MLT indicating that turbulence is highly intermittent. Comparing these results to model estimates from a high resolution GCM, we suggest that this intermittency partly reflects the gravity wave dynamics of the MLT. Future questions to be addressed are among others the relation of turbulent energy dissipation to turbulent mixing and the horizontal structure of turbulent cells.

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