The issue is devoted to mesoscale and submesoscale processes in the ocean. Its topics cover various aspects of the dynamics of these processes. The geography of the researches is represented quite widely. Specifically, the comparative influence of the topography, β-effect, and the gradient of the meridional variability of the background flow on the propagation of barotropic topographic Rossby waves in the region of the Antarctic Circumpolar Current is analyzed. The seasonal variability of the thermohaline structure of cyclonic and anticyclonic mesoscale eddies in the Lofoten Basin is investigated based on satellite altimetry and a combined data that includes hydrological profiles from various platforms. The peculiarities of hydrophysical processes on the shelf and sea-level fluctuations in the Sea of Japan are studied. Inertial oscillations in the Black Sea are analyzed. The results of the theoretical study of the Ekman-type boundary layer over the anisotropic underlying surface are presented. The results of numerical modelling of the tsunami wave propagation in the Azov and the Black Seas from several seismic sources, which pose a potential hazard to the Kerch Strait, are presented. The variability of water quality in Lake Ladoga is analyzed based on satellite data. A new method for estimating the anisotropy parameters of small-scale turbulence from the data of acoustic profilers is proposed. A study of sea ice dynamics in the Pechora Sea in winter 2019/2020 is presented. A systematization of summer characteristics of short-period internal waves in the Kuril-Kamchatka region is given. Thus, the issue contains extensive material on the topic “Mesoscale and submesoscale processes in the ocean”, which will contribute to solving new problems in this area.
The issue is dedicated to the theoretical and applied subjects in hydrophysics. A one-dimensional model of wave boundary layer with parameterization of stratification and elements of the wind waves influence is presented. A method for deriving turbulent stresses using a pair of ADCPs with one or two points of beam intersections is shown. A system for particle image velocimetry (PIV) measurements of velocity fields in a turbulent boundary layer within experiments carrying out on the modified hydrodynamic flume of the Atlantic Branch of the Shirshov Institute of Oceanology of RAS is described. A surface waves excitation by the bottom low-frequency harmonic vibrator is studied, the possibility of their registration by the coherent radar is analyzed. The results of numerical modeling of frequency-time interference pattern (interferogram) of the broadband sound source and its 2D Fourier transformation at presence of the internal waves are considered and analyzed. The methodology for studying the effect of low-frequency high-intensity acoustic fields on marine luminous planktonic organisms is investigated based on based on determining the parameters of bioluminescence, which is one of the most important indicators of the functional state of aquatic organisms. Сlimatic quantitative relationships are established between the surface water and air temperatures, the areas of the stratified and the isothermal area in Lake Ladoga during vernal frontal zone (thermobar) period. A model of mass transfer in the Kuibyshev Reservoir, developed on the basis of a system of equations of “shallow water”, a model of convective-diffusion transfer of a dissolved substance, as well as analytical formulas for calculating the total sediment discharge and water turbidity is presented. The practical recommendations are developed on the integrated use of sonar and magnetometric means for detecting chemical bombs, taking into account the specificity of the bottom relief and soil characteristics by the example of burial on the bottom of the Bornholm Basin of the Baltic Sea.