The influence of internal gravity waves in the atmospheric boundary layer on turbulence characteristics measured by the eddy covariance technique

The paper presents the results of an analysis of the influence of submesoscale internal gravity waves (IGWs), registered with the help of a sodar in the atmospheric boundary layer, on turbulence characteristics measured in the surface layer. Data obtained in rural areas in the Moscow region were used.Two types of IGW were identified visually on sodar echograms: internal gravity-shear waves (IGSW) of the Kelvin-Helmholtz wave type and buoyancy waves (BW). For 28 episodes of IGSW and 10 episodes of BW, based on the data of eddy covariance measurements carried out with an ultrasonic thermometer-anemometer located on a mast 56 m high, turbulent kinetic energy, as well as heat and momentum fluxes were calculated. Alterations of these characteristics accompanying the passage of wave trains were investigated, particularly, quantitative estimates were made, and degree of influence of IGSW and BW on the turbulence was compared.