Lidar estimates of the degree of anisotropy of wind turbulence in the stable atmospheric boundary layer
I.N. Smalikho1, V.A. Banakh1, A.V. Falits1, A.M. Sherstobitov1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
Keywords: когерентный доплеровский лидар, ветровая турбулентность, анизотропия, устойчивый пограничный слой атмосферы, coherent Doppler lidar, wind turbulence, anisotropy, stable atmospheric boundary layer
Abstract
To determine the degree of anisotropy of wind turbulence from measurements of the Stream Line lidar during experiments, we used a conical scanning by the probing beam, alternately setting the elevation angle equal to 35.3 and 60° after each scan. An experiment with such measurement geometry was carried out at the Basic Experimental Complex of IAO SB RAS in July 2018. The analysis of the measurement results at night in the presence of a low-level jet (LLJ) in the atmosphere showed that the variance (integral scale) of the horizontal component of the wind velocity is 2.26 (3.4) times larger than that of the vertical component. In the central part of the LLJ, the integral scales of the horizontal and vertical wind components are on average equal to 183 and 54 m, respectively.
|
