Lidar observations of atmospheric internal waves in the boundary layer of the atmosphere on the coast of Lake Baikal

Abstract

Abstract. Atmospheric internal waves (AIWs) in the boundary layer of atmosphere have been studied experimentally with the use of Halo Photonics pulsed coherent Doppler wind lidar Stream Line. The measurements were carried out over 14-28 August 2015 on the western coast of Lake Baikal (51 • 50 47.17 N, 104 • 53 31.21 E), Russia. The lidar was placed at a distance of 340 m from Lake Baikal at a height of 180 m above the lake level.A total of six AIW occurrences have been revealed. This always happened in the presence of one or two (in five out of six cases) narrow jet streams at heights of approximately 200 and 700 m above ground level at the lidar location. The period of oscillations of the wave addend of the wind velocity components in four AIW events was 9 min, and in the other two it was approximately 18 and 6.5 min. The amplitude of oscillations of the horizontal wind velocity component was about 1 m s −1 , while the amplitude of oscillations of the vertical velocity was 3 times smaller. In most cases, internal waves were observed for 45 min (5 wave oscillations with a period of 9 min). Only once the AIW lifetime was about 4 h.

Statistics of the Optical Turbulence from the Micrometeorological Measurements at the Baykal Astrophysical Observatory Site

“…By triangulation of local slopes, we reveal the heights of the turbulent layers in the atmospheric boundary layer at the Baykal astrophysical observatory site. The obtained heights (1500-3000 m and 400-600 m) are consistent with the data of lidar observations [16].…”

Measurements of wind turbulence parameters by a conically scanning coherent Doppler lidar in the atmospheric boundary layer

“…To test the described method for measurement of the wind turbulence parameters, we have conducted experiments with the conically scanning Stream Line lidar (the main parameters of the lidar can be found in Table 1 in Banakh and Smalikho, 2016) and the sonic anemometer at a height of 43 m in 2014 and 2016.…”

Lidar study of wind turbulence, low level jet streams, and atmospheric internal waves in the boundary layer of atmosphere

“…For estimation of the mean wind velocity the modified method of filtered sine wave fitting [2,3] was used. The method modified allows a 1.5-fold increase in the altitude of retrieval of the mean wind velocity profiles from lidar data as compared to the traditional sine wave fitting.…”

“…1 clearly show the presence of two jet streams with speed maxima at altitudes of about 250 and 750 m, respectively (hereinafter, the altitudes are given relative to the lidar location point). The directions of these jet streams are almost perpendicular to each other (the bottom jet stream was directed from north to south through mountains, and the top jet stream was directed from east to west, i.e., from the lake side) [3]. The atmospheric conditions promoted generation of an AIW.…”