Variability of hydrophysical fields under the influence of tides in the river plume frontal zone of the Onega Bay of the White Sea according to a study conducted in June 2023

The  results  of  a  series  of  experiments  conducted  in  June 2023 in the Onega Bay of the White Sea are presented. The study included quasi-temporal in situ and satellite observations in the vicinity of the river plume frontal area formed by the waters of the Onega River. The main objectives were to define the characteristics and dynamics of the area under the influence of tides, as well as to assess the causes of short-term spatial and temporal variability in the characteristics of thermohaline fields. The results show that tides have a significant effect on the structure of waters near the Lyamitsky shore. Here, a large contribution is made by fast-flowing water oscillations associated with short-term internal waves, which frequently occur near the frontal interface. The study demonstrates that the use of high-resolution optical and radar satellite imagery allows a more efficient analysis of frontal and wave dynamics, which is of great importance for understanding the peculiarities of local hydrodynamic processes in the water areas of tidal seas.

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