Fields of Oceanological Characteristics in the Abramova Bay (Sevastopol) in November 2019

P. D. Lomakin1,*, A. I. Chepyzhenko1, Е. А. Grebneva2

1 Marine Hydrophysical Institute of RAS, Sevastopol, Russia

2 Institute of Natural and Technical Systems, Sevastopol, Russia

* e-mail: p_lomakin@mail.ru

Abstract

Based on the data of the expedition carried on November 2019, the first representation about the flows, thermohaline structure and fields of total suspended matter, dissolved organic matter and concentration of dissolved oil products in the waters of the Abramova Bay were received. It is shown that the bay under study, in contrast to the adjacent bays (Kazachya, Kamyshovaya, Kruglaya), has its own morphometric features: this is a relatively wide apex not isolated from the seaward area. In its apex, the bay is also less exposed to groundwater. A cyclonic eddy of water circulation was revealed in the bay. In its seaward region, a westward flow of wind current was observed at a speed of 15–30 cm/s in the upper layer of the sea and 10–20 cm/s at the bottom. In the shallow southern part of the bay, a coastal current was noted with an eastern component and a velocity of 5–15 cm/s, which flowed around the coastline along a cyclonic path. The vertical structure of the analyzed field’s quantities, with the exception of the dissolved oil products field, was formed by the autumn – winter convection process. The fields of these quantities were highly uniform throughout the bay. In contrast to the adjacent bays, in the Abramova Bay apex there was no vertical stratification of the thermohaline field. The local minimum salinity and concentration maxima of the total suspended matter and dissolved organic matter found in the apex of the studied bay are a consequence of the influence of a fresh water source, which can be both natural and anthropogenic. It is shown that the waters of the Abramova Bay contain dissolved oil products, the probable source of which is located in the sea.

Keywords

currents, temperature, salinity, total suspended matter, dissolved organic matter, dissolved oil products, Abramova Bay, Crimea

Acknowledgments

The research is performed under state order on topic No. 0827-2019-0004 “Complex interdisciplinary research of oceanologic processes, which determine functioning and evolution of the Black and Azov Sea coastal ecosystems”. The research is performed as part of scientific project No. 18-45-920068 and is funded by the RFBR and the city of Sevastopol.

For citation

Lomakin, P.D., Chepyzhenko, A.I. and Grebneva, Е.А., 2020. Fields of Oceanological Characteristics in the Abramova Bay (Sevastopol) in November 2019. Ecological Safety of Coastal and Shelf Zones of Sea, (2), pp. 68–79. doi:10.22449/2413-5577-2020-1-68-79 (in Russian).

DOI

10.22449/2413-5577-2020-2-68-79

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