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

References

  1. Bogdanova, A.K., 1959. [Upsurge and Downsurge Circulation and its Role in Enrichment of the Black Sea Surface Waters with Nutritional Salts]. In: V. A. Vodyanitsky, Ed., 1959. Trudy Sevastopolskoy Biologicheskoy Stantsii [Proceedings of the Sevastopol Biological Station]. Moscow: Izdatelstvo Akademii Nauk SSSR. Iss. 11, pp. 335–352 (in Russian).
  2. Bogdanova, A.K., 1959. [Upsurge and Downsurge Currents in the Coastal Zone near a Steep-Bottom Rather Straight Coast]. In: V. A. Vodyanitsky, Ed., 1959. Trudy Sevastopolskoy Biologicheskoy Stantsii [Proceedings of the Sevastopol Biological Station]. Moscow: Izdatelstvo Akademii Nauk SSSR. Iss. 12, pp. 421–455 (in Russian).
  3. Bogdanova, A.K. and Korpachev, L.N., 1959. [Upsurge and Downsurge Circulation and its Role for the Hydrological Regime of the Black Sea]. Meteorologiya i Gidrologiya, (4), pp. 26–32 (in Russian).
  4. Ivanov, V.A. and Mikhaylova, E.N., 2008. [Upwelling in the Black Sea]. Sevastopol: ECOSI-Gidrofizika, 92 p. (in Russian).
  5. Mikhailova, E.N., Muzyleva, M.A. and Polonsky A.B., 2009. Spatial and Temporal Variability of Parameters of Upwelling in the Northwestern Black Sea and near Crimea Coast in 2005 – 2008. In: MHI, 2014. Ekologicheskaya Bezopasnost' Pribrezhnykh i Shel'fovykh Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources]. Sevastopol, ECOSI-Gidrofizika. Iss. 20, pp. 160–170 (in Russian).
  6. Dzhiganshin, G.F., Polonskii, A.B. and Muzyleva, M.A., 2010. Upwelling in the Northwest Part of the Black Sea at the End of the Summer Season and its Causes. Physical Oceanography, (4), pp. 281–293. https://doi.org/10.1007/s11110-010-9084-0
  7. Mikhailova, É.N., Polonsky, A.B. and Muzyleva, M.A., 2012. On the Causes of Decrease in the Surface Temperature of Water in the Karkinitskii Bay of the Black Sea. Physical Oceanography, 21(6), pp. 394–400. https://doi.org/10.1007/s11110-012-9131-0
  8. Sur, H. I., Özsoy, E. and Ünlüata, Ü., 1994. Boundary current instabilities, upwelling, shelf mixing and eutrophication processes in the Black Sea. Progress in Oceanography, 33(4), pp. 249–302. https://doi.org/10.1016/0079-6611(94)90020-5
  9. Ivanov, V.A., Ovsyany, E.I., Repetin, L.N., Romanov, A.S. and Ignatyeva, O.G., 2006. Hydrological and Hydrochemical Regime of the Sebastopol Bay and its Changing under Influence of Climatic and Anthropogenic Factors. Sevastopol: MHI NAS of Ukraine, 90 p. (in Russian)
  10. Ginzburg, A.I., Kostianoy, A.G., Soloviev, D.M. and Stanichny, S.V., 1997. Coastal upwelling in the Northwestern Part of the Black Sea. Issledovanie Zemli iz kosmosa, (6), pp. 61–72 (in Russian).
  11. Borovskaja, R.V., Lomakin, P.D., Panov, B.N. and Spiridonova, E.O., 2008. Structure and Interannual Variability of Characteristics of Inshore Black Sea Upwelling on Basis of Satellite Monitoring Data. Issledovanie Zemli iz Kosmosa, (2), pp. 26–36 (in Russian).
  12. Lomakin, P.D., 2018. Upwelling in the Kerch Strait and the Adjacent Waters of the Black Sea Based on the Contact and Satellite Data. Physical oceanography, 25(2), pp. 114–123. doi:10.22449/1573-160X-2018-2-114-123
  13. Boss, E.S, Pegau, W.S., Zaneveld, J.R. and Barnard, A.H., 2001.Spatial and Temporal Variability of Absorption by Dissolved Material at a Continental Shelf. Journal of Geophysical Research. Oceans, 106(C5), pp. 9499–9508. doi:10.1029/2000JC900008
  14. Tedetti, M., Longhitano, R., Garcia, N., Guigue, C., Ferretto, N. and Goutx, M., 2012. Fluorescence Properties of Dissolved Organic Matter in Coastal Mediterranean Waters Influenced by a Municipal Sewage Effluent (Bay of Marseilles, France). Environmental Chemistry, 9(5), pp. 438–449. doi:10.1071/EN12081
  15. Saraceno, J.F., Pellerin, B.A., Downing, B.D. Boss, E., Bachand, P.A.M. and Bergamaschi B.A., 2009. High-frequency in situ optical measurements during a storm event: Assessing relationships between dissolved organic matter, sediment concentrations, and hydrologic processes. Journal of Geophysical Research. Biogeosciences, 114(G4), G00F09. doi:10.1029/2009JG000989
  16. Borovskaya, R.V., Lomakin, P.D. and Popov, M.A., 2009. Upwelling in the Balaklava Bay and Adjacent Black Sea Using Satellite Data. In: MHI, 2000. Ekologicheskaya Bezopasnost' Pribrezhnykh i Shel'fovykh Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources]. Sevastopol: ECOSI-Gidrofizika. Iss. 20, pp. 171–179 (in Russian).

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