The spectrum of waves and turbulence at the tropopause

Details The spectrum of waves and turbulence at the tropopause The spectrum of waves and turbulence at the tropopause

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207801d&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 7, CiteID L07801

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4

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

Scientific paper

Aircraft measurements of winds, temperatures, and composition were conducted with a high-altitude aircraft in the tropopause region above Northern Wales during May and June 2000. Observations on 6 June 2000 along three vertically stacked horizontal flight legs show fluctuations due to both gravity waves and turbulence. Horizontal kinetic energy spectra determined from the measurements extend to 3 m in wavelength, the smallest scales yet available at these heights. The vertical wind spectrum for strong turbulence is considerably different in both shape and intensity from the non-turbulent spectrum. A sharp knee in the turbulent spectrum at 100 m wavelength is associated with the equipartition of kinetic energy in three dimensions. At other scales the vertical motions are relatively suppressed. A wave with 500 m wavelength was found, and provides a transition between the turbulent and non-turbulent cases.

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