INTERNAL WAVES AND THEIR INFLUENCE ON DISSOLVED OXYGEN VARIABILITY ON THE GELENDZHIK SHELF OF THE BLACK SEA IN SUMMER TIME

The paper presents field observations of internal waves at the Gelendzhik polygon from 14– 23 June 2023. The measurements were taken simultaneously on four moored thermochaines, installed at a depth of approximately 23 m. Currents were recorded, and the water column was vertically profiled with measurements of temperature, conductivity, and dissolved oxygen. Dissolved oxygen was recorded at a depth of 18 metres on one of the thermochains. The most intense short-period trains recorded after the strengthening of the alongshore north-western current are presented. The internal waves of the first and second modes are revealed. The main parameters of the observed internal waves are estimated. It is shown that near-inertial internal waves approaching the coastal zone contain colder and saltier water with reduced oxygen content. As a result, their approach leads to a 10 % drop in water oxygen saturation at the horizon. An example of the effect of short-period internal waves on dissolved oxygen content is presented.