Lidar investigation of wind turbulence on the coastal zone of Lake Baikal at presence of a low-level jet in the atmosphere

To study the peculiarities of wind turbulence in the presence of a low-level jet (LLJ) in the atmospheric boundary layer, we used the raw data measured by a Stream Line coherent Doppler lidar on the coast of Lake Baikal in the summer of 2015. From these data, the height and time distributions of the of turbulent energy dissipation rate, the variance of wind speed and the integral scale of turbulence were reconstructed. For the first time from lidar measurements, quantitative estimates of the dissipation rate and the integral scale of turbulence inside the LLJ were obtained with a sufficiently high accuracy. An excess of the dissipation rate by 1-2 orders in the lower part of the LLJ above the corresponding value in the upper part of the LLJ is revealed. In the center of the jet stream, the integral scale of turbulence is of the order of 100 m, which is 2-3 times less than the effective thickness of the LLJ.

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