Features of Forming the Alongcoastal Circulation of the Coastal Ecotone Waters nearby the Southern Coast of Crimea

A. S. Kuznetsov✉, I. K. Ivashchenko

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: kuznetsov_as@mhi-ras.ru

Abstract

Purpose. The study is aimed at expanding the notions on the features of forming the mode characteristics, vertical structure and interannual variability of the costal ecotone water circulation nearby the Southern coast of Crimea, as well as on the characteristics, conditions and lifetime of bimodal structure of the coastal current directions.

Methods and Results. New scientific results were obtained with the regard for systematizing and analyzing the already published results on the problem under study. The preset tasks were solved using the monitoring data on variability of the coastal current vertical structure for 2002–2021 obtained through a set of domestic current meters installed at the stationary oceanographic platform of the Black Sea Hydrophysical Sub-Satellite Polygon of Marine Hydrophysical Institute. The materials on the currents’ vector base which had passed state registration were processed according to the technique developed on the basis of the standard methods of digital filtering and mathematical statistics. It was found that nearby the Black Sea coast, there existed two different modes of water circulation: the stationary monomodal alongcoastal current and the bimodal modulation of the direction of total alongcoastal flow induced by the intense hydrodynamic disturbances. At all the horizons near Cape Kikineiz, the reverse mode of bimodal structure was formed mostly due to the contribution of fluctuations with the periods up to 3 days, which constituted 98%, whereas the contribution of those with the periods 3–4 days was 2%. A significant decrease in the annual average velocity of a monomodal current changed the conditions for a bimodal structure existence in the near-surface layer where the period of oscillations forming a reverse mode, had increased in 2020 to 5 days.

Conclusions. The results obtained expand our notions on the features of the coastal water circulation mode, and on the conditions and characteristics of the coastal current bimodal structure formed near Cape Kikineiz mostly due to a significant contribution (to 91%) of the fluctuations with periods up to 2 days. The prospect for further development both of the research techniques and the possibility of analyzing quantitative estimates of the coastal current variability including the interannual range are demonstrated.

Keywords

Black Sea, coastal zone, Southern coast of Crimea, water circulation, bimodal current direction, empirical distribution function, spectral density

Acknowledgements

The study was carried out within the framework of the state task of the FRC MHI on theme FNNN-2021-0005 “Complex interdisciplinary research of oceanological processes which determine functioning and evolution of ecosystems in the coastal zones of the Black and Azov seas”.

Original russian text

Original Russian Text © A. S. Kuznetsov, I. K. Ivashchenko, 2023, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 39, Iss. 2, pp. 189-204 (2023)

For citation

Kuznetsov, A.S. and Ivashchenko, I.K., 2023. Features of Forming the Alongcoastal Circulation of the Coastal Ecotone Waters nearby the Southern Coast of Crimea. Physical Oceanography, 30(2), pp. 171-185. doi:10.29039/1573-160X-2023-2-171-185

DOI

10.29039/1573-160X-2023-2-171-185

References

  1. Timchenko, I.E., Ivaschenko, I.K. and Igumnova, E.M., 2017. Management of Ecological- Economic Processes of Pollution Accumulation and Assimilation in the Coastal Zone Marine Environment. Physical Oceanography, (1), pp. 68-83. doi:10.22449/1573-160X-2017-1-68- 83
  2. Kuznetsov, A.S., Ivanov, V.A., Morozov, A.N. and Man’kovskaya, E.V., 2017. The Technology of Study of the Coastal Waters’ Dynamics as an Element of Crisis Monitoring of the Natural Environment. In: G.G. Matishov, ed., 2017. Proceedings of Scientific Events Devoted to the 15-Year Anniversary of the Southern Scientific Center of the Russian Academy of Sciences (Rostov-on-Don, December 13-16, 2017). Rostov-on-Don: SSC RAS Publishers, pp. 120-122 (in Russian).
  3. Belyaev, V.I., Doroguntsov, S.I., Sovga, E.E. and Nikolaenko, T.S., 2001. Estimation of Degree of Anthropogenic Loads on Coastal Zones and Ecotones of the Black Sea Coast of Ukraine. Morskoy Gidrofizicheskiy Zhurnal, (1), pp. 55-63 (in Russian).
  4. Pokazeev, K., Sovga, E. and Chaplina, T., 2021. Pollution in the Black Sea: Observations about the Ocean’s Pollution. Cham, Switzerland: Springer, 213 p. https://doi.org/10.1007/978-3-030-61895-7
  5. Izrael, Yu.A. and Tsiban, A.V., 1983. On the Assimilation Capacity of the World Ocean. Doklady Akademii Nauk SSSR, 272(3), pp. 702-705 (in Russian).
  6. Ivanov, V.A. and Dulov, V.A., eds., 2014. Monitoring of the Coastal Zone in the Black Sea Experimental Sub-Satellite Testing Area. Sevastopol: ECOSI-Gidrofizika, 526 p. (in Russian).
  7. Ivanov, V.A., Kuznetsov, A.S. and Morozov, A.N., 2019. Monitoring Coastal Water Circulation along the South Coast of Crimea. Doklady Earth Sciences, 485(2), pp. 405-408. doi:10.1134/S1028334X19040044
  8. Krivosheya, V.G., Plakhin, E.A., Savin, M.T. and Titov, V.B., 1980. [On the Annual Variability of Currents on the Shelf of the Caucasian Coast of the Black Sea]. Okeanologiya, 20(1), pp. 34-36 (in Russian).
  9. Ovchinnikov, I.M., Titov, V.B. and Krivosheya, V.G., 1986. New Data on the Time Variability of Currents according to the Results of Perennial Measurements from a Stabilized Buoy on the Black Sea Shelf. Doklady Akademii Nauk SSSR, 286(5), pp. 1250-1254 (in Russian).
  10. Ovchinnikov, I.M. and Titov, V.B., 1990. Anticyclonic Vorticity of Currents in the Offshore Zone of the Black Sea. Doklady Akademii Nauk SSSR, 314(5), pp. 1236-1239 (in Russian).
  11. Titov, V.B., 1992. Statistical Characteristics and the Variability of Currents over the Western Black Sea Shelf. Soviet Journal of Physical Oceanography, 3(2), pp. 131-139. https://doi.org/10.1007/BF02197619
  12. Boguslavsky, S.G., Koveshnikov, L.A., Kaminsky, S.T. and Markov, A.A., 1992. Features of the Currents at a Bold Coast. Soviet Journal of Physical Oceanography, 3(5), pp. 357-365. https://doi.org/10.1007/BF02198066.
  13. Titov, V.B., 1992. About the Role of Eddies in Current Regime Formation on the Black Sea Shelf and Ecology Coastal Zone. Okeanologiya, 32(1), pp. 39-48 (in Russian).
  14. Ivanov, V.A. and Yankovsky, A.E., 1993. Local Dynamic Experiment in the Shelf Zone of Southern Crimean Coast. Okeanologiya, 33(1), pp. 49-56 (in Russian).
  15. Ivanov, V.A. and Yankovsky, A.E., 1995. Dynamics of the Crimea Shelf Waters in Summer. Physical Oceanography, 6(3), pp. 201-217. https://doi.org/10.1007/BF02197518.
  16. Krivosheya, V.G., Titov, V.B., Ovchinnikov, I.M., Moskalenko, L.V., Skirta, A.Yu. and Monakhov, V.V., 2001. New Data on the Current Regime on the Shelf of the Northeastern Black Sea. Oceanology, 41(3), pp. 307-316.
  17. Titov, V.B., Krivosheya, V.G. and Moskalenko, L.V., 2002. Currents Regime in Russian Sector of the Black Sea. In: A. G. Zatsepin and M. V. Flint, eds., 2002. Multidisciplinary Investigations of the Northeast Part of the Black Sea. Moscow: Nauka, pp. 48-55 (in Russian).
  18. Belokopytov, V.N., Sarkisov, A.A. and Shchurov, S.V., 2003. Currents near the Part of the Crimean Coast from the Sarych Cape to Katcivelli. In: MHI, 2003. Ekologicheskaya Bezopasnost' Pribrezhnoy i Shel'fovoy Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources]. Sevastopol: MHI. Iss. 8, pp. 64-68 (in Russian).
  19. Krivosheya, V.G., Moskalenko, L.V. and Titov, V.B., 2004. On the Current Regime over the Shelf near the North Caucasian Coast of the Black Sea. Oceanology, 44(3), pp. 331-336.
  20. Ivanov, V.A. and Belokopytov, V.N., 2013. Oceanography of the Black Sea. Sevastopol: ECOSI-Gidrofizika, 210 p.
  21. Zatsepin, A.G., Elkin, D.N., Korzh, A.O., Kuklev, S.B., Podymov, O.I., Ostrovskii, A.G. and Soloviev, D.M., 2016. On Influence of Current Variability in the Deep Black Sea upon Water Dynamics of Narrow North Caucasian Continental Shelf. Physical Oceanography, (3), pp. 14- 22. doi:10.22449/1573-160X-2016-3-14-22
  22. Bondur, V.G., Sabinin, K.D. and Grebenyuk, Yu.V., 2017. Characteristics of Inertial Oscillations According to the Experimental Measurements of Currents on the Russian Shelf of the Black Sea. Izvestiya, Atmospheric and Oceanic Physics, 53(1), pp. 120-126. doi:10.1134/S0001433816050030
  23. Khimchenko, E.E. and Serebryany, A.N., 2018. Internal Waves on the Caucasian and Crimean Shelves of the Black Sea (According to Summer-Autumn Observations 2011–2016). Journal of Oceanological Research, 46(2), pp. 69-87. doi:10.29006/1564-2291.JOR- 2018.46(2).7 (in Russian).
  24. Kuznetsov, A.S., 2018. System of Assessment of the Vector Data Quality and Opportunity of Antenna Measurements of Currents. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 50-57. doi:10.22449/2413-5577-2018-1-50-57 (in Russian).
  25. Kuznetsov, A.S., 2022. Mean Long-Term Seasonal Variability of the Coastal Current at the Crimea Southern Coast in 2002–2020. Physical Oceanography, 29(2), pp. 139-151. doi:10.22449/1573-160X-2022-2-139-151

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