The structural characteristic of the refractive index of optical waves was calculated from experimental data on the microstructure of the temperature turbulence in the atmospheric boundary layer. The experimental data were obtained with an acoustic meteorological radar (sodar), ultrasonic anemometer–thermometer, and meteorological temperature profilometer. Estimates of the structural characteristics for different conditions in the atmospheric boundary layer are presented and were compared with model profiles.

The outer turbulence scales of temperature and wind vector components in the surface air layer over urban territory and natural terrain are calculated. Monthly average values of the outer...

Possible displacements of laser beams in the atmospheric boundary layer under the effect of regular refraction are calculated. The case where a radiation source is located at the level of underlying...

The possibility of estimating the optical refractive index in the atmospheric boundary layer from air temperature profiles measured with a MTP-5 meteorological temperature profiler is studied. The...

Results of the analysis of height profiles of the normalized structure characteristic of air temperature C_T² in the atmospheric boundary layer under conditions of daytime convection are discussed. The experimental data were obtained using the Volna-4M acoustic Doppler radar (sodar) in Akademgorodok district (Tomsk, Russia). The profiles were automatically normalized to the value of C_T² at the height H = 100 m. The analysis involved results obtained in daytime (11:00–16:00 LT) in a warm period (from July to August) of 2015. The shape of height profiles of C_T² obtained by the sodar are compared with similar profiles obtained by other authors. The presence of a break in the profiles of C_T² at heights of 60–80 m is noted.

The height of the mixing layer is a significant parameter for describing the dynamics of the planetary boundary layer (PBL), especially for air quality control and for the parametrizations in numerical modeling. The problem is that the heights of the mixing layer cannot be measured directly. The values of this parameter are depending both on the applied algorithms for calculation and on the measuring instruments which have been used by the data source. To determine the height of a layer of intense turbulent heat exchange, data were used from acoustic meteorological locator (sodar) and from a passive single-channel scanning microwave radiometer MTP-5 (MWR) to measure the temperature profile in a layer of up to 1 km. Sodar can provide information on the structure of temperature turbulence in the PBL directly. These data have been compared with the mixing layer height calculated with the Parcel method by using the MTP-5 data. For the analysis, July and September 2020 were selected in the city of Tomsk in Siberia as characteristic periods of mid-summer and the transition period to autumn. The measurement results, calculations and inter-comparisons are shown and discussed in this work. During temperature inversions in the boundary layer, it was observed that turbulent heat transfer (increased dispersion of air temperature) is covering the inversion layers and the overlying ones. Moreover, this phenomenon is not only occurring during the morning destruction of inversions, but also in the process of their formation and development.