Large-Scale Upwelling in the Sevastopol Seaside Area and its Influence on the Structure and Quality of Water

P. D. Lomakin1,*, M. A. Popov2

1Marine Hydrophysical Institute of RAS, Sevastopol, Russia

2A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russia

*e-mail: p_lomakin@mail.ru

Abstract

Based on the data of long-term (2000–2020) coastal observations and a series of observations with a distributed sensor (summer 2019) of the water temperature, as well as the results of two oceanographic surveys, cases of large-scale upwelling in the water area of the Sevastopol seaside are revealed. The temporal characteristics of this phenomenon and the associated temperature anomalies are compared with similar parameters, which were analyzed by us earlier near the western coast of Crimea in 1988–2007 according to satellite observations. During 20 years, 42 cases of large-scale upwelling with a temperature range of 2–7 °C and a duration of 4 to 32 days аre detected. It is shown that in the Sevastopol seaside area large-scale upwelling is accompanied by significant deviations of water temperature from the summer background. On a time scale of 1–3 days, their range on the sea surface was equal to 2–3 °C, and in the intermediate and bottom layers it reached 10–16 °C. The spread of upwelling waters into the uniform temperature coastal zone are accompanied by the formation of developed vertical water stratification. The upwelling waters penetrating the seashore contribute to a significant decrease in the concentration of colored dissolved organic matter to the values typical for the open Black Sea waters, and contribute to an increase in water quality.

Keywords

water temperature, colored dissolved organic matter, large-scale upwelling, Sevastopol seaside, Crimea

Acknowledgments

The work was performed under state order on topic no. 0555-2021-0005 “Comprehensive interdisciplinary studies of oceanological processes that determine the functioning and evolution of ecosystems in the coastal zones of the Black and Azov Seas” complexes with the aim of developing scientific foundations for obtaining biologically active substances and technical products of marine genesis" state registration № 121030300149-0. The study was funded by the Russian Foundation for Basic Research and the city of Sevastopol under scientific project no. 18-45-920068.

For citation

Lomakin P.D., Popov M.A., 2021. Large-Scale Upwelling in the Sevastopol Seaside Area and its Influence on the Structure and Quality of Water. Ecological Safety of Coastal and Shelf Zones of Sea, (4), pp. 39–50. doi:10.22449/2413-5577-2021-4-39-50 (in Russian).

DOI

10.22449/2413-5577-2021-4-39-50

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