Abstract
The paper presents the results of probing the stable atmospheric boundary layer in the coastal zone of Lake Baikal with a coherent Doppler wind lidar and a microwave temperature profiler. Two-dimensional height–temporal distributions of the wind velocity vector components, temperature, and parameters characterizing atmospheric stability and wind turbulence were obtained. The parameters of the low-level jets and the atmospheric waves arising in the stable boundary layer were determined. It was shown that the stable atmospheric boundary layer has an inhomogeneous fine scale layered structure characterized by strong variations of the Richardson number Ri. Layers with large Richardson numbers alternate with layers where Ri is less than the critical value of the Richardson number Ricr = 0.25. The channels of decreased stability, where the conditions are close to neutral stratification 0 < Ri < 0.25, arise in the zone of the low-level jets. The wind turbulence in the central part of the observed jets, where Ri > Ricr, is weak, increases considerably to the periphery of jets, at heights where Ri < Ricr. The turbulence may intensify at the appearance of internal atmospheric waves.
Highlights
The processes of the origination and the evolution of turbulence in stably stratified media remain poorly understood in many areas of geophysics
Wave processes may play a critical part in this mechanism, and this determines the urgency of the studies of the wave–turbulence interaction in a stable atmospheric boundary layer (ABL) [9,10]
Atmospheric Stability and level jets (LLJs) RemotFe Sigenusr. e20320,d1e2p, 9i5c5ts the diurnal dynamics of the temperature measured in 3 min intervals o6nof1246 August 2018 at heights from 180 to 1180 m above the Lake Baikal water surface
Summary
The processes of the origination and the evolution of turbulence in stably stratified media remain poorly understood in many areas of geophysics. This applies to the atmosphere and its boundary layer, in which thermodynamic processes play an important role in the formation of weather and climate and affect the efficiency of wind power engineering and aviation safety. The Kolmogorov–Obukhov–Monin theory of isotropic turbulence is used successfully for the description of an unstable and neutrally stratified atmospheric boundary layer (ABL) [1,2]. Wave processes may play a critical part in this mechanism, and this determines the urgency of the studies of the wave–turbulence interaction in a stable ABL [9,10]
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