Estimation of turbulence energy dissipation rate and vertical eddy diffusivity with the MU radar RASS

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We have conducted RASS (Radio Acoustic Sounding System) observations with the MU (Middle and Upper atmosphere) radar on 28-31 July 1994 at Shigaraki, Japan (34°51' N, 136°06' E) and determined the characteristics of turbulence energy dissipation rate (ɛ) and vertical eddy diffusivity (K) in the troposphere and lower stratosphere. We have first examined the accuracy of the Brunt Väisälä frequency squared (N2) derived from RASS temperature profiles. Then, ɛ and K are determined by using N2 and the Doppler spectral width of turbulence echoes (σ2turb). We found that the structures of ɛ and K are sometimes affected by the local variations of N2. We found that sometimes ɛ became small, even though σ2turb was large, because N2 was small. On the contrary, K was enhanced due to small N2, although σ2turb was small.

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