Mean Long-Term Seasonal Variability of the Coastal Current at the Crimea Southern Coast in 2002–2020

A. S. Kuznetsov

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

e-mail: kuznetsov_as@mhi-ras.ru

Abstract

Purpose. The study is aimed at systematizing new scientific knowledge on the regime, regularities and features of seasonal water circulation in the Black Sea coastal zone, i.e. in the dynamically active area near the of the Southern coast of Crimea. The data for the past decade were obtained in course of a long-term in situ experiment.

Methods and Results. The presented results were obtained by means of complex processing and analyzing the data on the currents monitored at the Black Sea hydrophysical sub-satellite test site of Marine Hydrophysical Institute of RAS in 2002–2020. Instrumental measurements were performed by a cluster of the autonomous Euler current meters using a verified monitoring information technology from a stationary oceanographic platform in the deep sea at a distance 0.5 km from the coast. The information of the generated long-term currents monitoring database has been confirmed by the metrological control of measurements quality and has got state registration. In the coastal zone, parameters of the along-coastal current directed to the west-south-west were studied at the average (for 19 years) flow velocity 8.1 cm/s which was maximal in the near-surface layer. When the eddy-wave oscillations propagate near the coast, the elliptical orbital circulation is transformed into a system of the along-coastal reciprocal water oscillations of the corresponding scales which are collinear to the existing coastal current. The existence of a bimodal distribution of occurrence frequency of the along-coastal current direction depends on intensity of contribution of the eddy-wave oscillations to water circulation. The bimodal structure of a current is arises at such modulus values of the perturbation orbital velocities that exceed the one of the velocity of the monomodal along-coastal current vector.

Conclusions. Based on the results of spectral analysis, the energy contribution of the coastal water different-scale fluctuations to variability of the stationary along-coastal current near the Cape Kikineiz was systematized. Analysis of the long-term average frequency spectra of distribution of the kinetic energy density of water oscillations in the coastal ecotone permitted to identify statistically reliably the intense seasonal current fluctuations for an annual period, as well as the fluctuations near the second and third annual harmonics. It is shown that large-scale variability of the quasi-stationary coastal current is controlled by water dynamics in the shelf-slope zone of the Black Sea, whereas on smaller scales it is affected by influence of the local wind conditions.

Keywords

Black Sea, instrumental monitoring of currents, coastal water circulation, seasonal fluctuations, kinetic energy spectrum

Acknowledgements

The research was carried out within the framework of the state assignment of FRC MHI on theme No. 0555-2021-0005 “Complex interdisciplinary research of oceanologic processes which determine functioning and evolution of the Black and Azov seas coastal ecosystems”.

Original russian text

Original Russian Text © A. S. Kuznetsov, 2022, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 38, Iss. 2, pp. 151-164 (2022)

For citation

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

DOI

10.22449/1573-160X-2022-2-139-151

References

  1. Belyaev, V.I., Doroguntsov, S.I., Sovga, E.E. and Nikolaenko, T.S., 2001. Estimation of Degree of Anthropogenic Loads on Costal Zones and Ecotones of the Black Sea Coast of Ukraine. Morskoy Gidrofizicheskiy Zhurnal, (1), pp. 55-63 (in Russian).
  2. Pokazeev, K., Sovga, E. and Chaplina, T., 2021. Pollution in the Black Sea: Observations about the Ocean’s Pollution. Cham: Springer, 213 p. https://doi.org/10.1007/978-3-030-61895-7
  3. Koveshnikov, L.A., Ivanov, V.A., Boguslavsky, S.G., Kazakov, S.I. and Kaminsky, S.T., 2001. Problems of Heat and Dynamic Interaction in a Sea – Atmosphere – Land System of the Black Sea Region. In: MHI, 2001. 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. 3, pp. 9-52 (in Russian).
  4. Ostrovskii, A.G. and Zatsepin, A.G., 2016. Intense Ventilation of the Black Sea Pycnocline due to Vertical Turbulent Exchange in the Rim Current Area. Deep-Sea Research Part I: Oceanographic Research Papers, 116, pp. 1-13. doi:10.1016/j.dsr.2016.07.011
  5. 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
  6. Morozov, A.N., Zatsepin, A.G., Kuklev, S.B., Ostrovskii, A.G. and Fedorov, S.V., 2017. Vertical Structure of Currents in the Upper Part of the Continental Slope of the Black Sea in the Region of Gelendzhik. Izvestiya, Atmospheric and Oceanic Physics, 53(6), pp. 632-640. doi:10.1134/S0001433817060093
  7. Morozov, A.N., 2018. Vertical Structure of Current Velocity Shears in the Main Pycnocline of the Black Sea Based on the in situ Data in 2016. Physical Oceanography, 25(6), pp. 472-478. doi:10.22449/1573-160X-2018-6-472-478
  8. Serebryany, A.N. and Ivanov, V.A, 2013. Study of Internal Waves in the Black Sea from Oceanography Platform of Marine Hydrophysical Institute. Fundamentalnaya i Prikladnaya Gidrofizika, 6(3), pp. 34-45 (in Russian).
  9. Ivanov, V.A., Shul’ga, T.Ya., Bagaev, A.V., Medvedeva, A.V., Plastun, T.V., Verzhevskaia, L.V. and Svishcheva, I.A., 2019. Internal Waves on the Black Sea Shelf near the Heracles Peninsula: Modeling and Observation. Physical Oceanography, 26(4), pp. 288-304. doi:10.22449/1573-160X-2019-4-288-304
  10. Serebryany, A., Khimchenko, E., Popov, O., Denisov, D. and Kenigsberger, G., 2020. Internal Waves Study on a Narrow Steep Shelf of the Black Sea Using the Spatial Antenna of Line Temperature Sensors. Journal of Marine Science and Engineering, 8(11), 833. doi:10.3390/jmse8110833
  11. Goryachkin, Yu.N. and Ivanov, V.A., 2006. [The Black Sea Level: Past, Present and Future]. Sevastopol: MHI, 210 p. (in Russian).
  12. Ivanov, V.A. and Belokopytov, V.N., 2013. Oceanography of the Black Sea. Sevastopol: MHI, 210 p.
  13. Blatov, A.S., Bulgakov, N.P., Ivanov, V.A., Kosarev, A.N. and Tuzhilkin, V.S., 1984. Variability of Hydrophysical Fields of the Black Sea. Leningrad: Gidrometeoizdat, 240 p. (in Russian).
  14. 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- 39 (in Russian).
  15. Ovchinnikov, I.M., Titov, V.B., and Krivosheia, V.G., 1986. [New Data on the Time Variability of Currents According to the Results of Perennial Measurements from a Stabilized Buoy of the Black Sea Shelf]. Doklady Akademii Nauk SSSR, 286(5), pp. 1250-1254 (in Russian).
  16. Ovchinnikov, I.M. and Titov, V.B., 1990. Anti-Cyclonic Vorticity of Currents in the Offshore Zone of the Black Sea. Doklady Akademii Nauk SSSR, 314(5), pp. 1236-1239 (in Russian).
  17. 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. doi:10.1007/BF02197619
  18. Latun, V.S., 2001. Currents’ Structure near the South Coast of Crimea. In: MHI, 2001. 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. 3, pp. 53-56 (in Russian).
  19. 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.
  20. 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' 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. 8, pp. 64-68 (in Russian).
  21. 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.
  22. Kuznetsov, A.S., Ivanov, V.A. and Zima, V.V., 2017. Peculiarities of Mesoscale Water Dynamics near the South Coast of Crimea in 2008–2016. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 32-39 (in Russian).
  23. 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
  24. Kuznetsov, A.S., Zima, V.V. and Shcherbachenko, S.V., 2020. Variability of Characteristics of the Coastal Current at the Southern Coast of Crimea in 2017–2019. Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 5-16. doi:10.22449/2413-5577-2020-3-5-16 (in Russian).
  25. Kuznetsov, A.S., 2020. Structure of the Coastal Current Direction Bimodality at the Southern Coast of Crimea in 2002–2008. Ecological Safety of Coastal and Shelf Zones of Sea, (4), pp. 78-88. doi:10.22449/2413-5577-2020-4-78-88 (in Russian).
  26. Ivanov, V.A. and Dulov, V.A., eds., 2014. Monitoring of the Coastal Zone in the Black Sea Experimental Sub-Satellite Testing Area. Sevastopol: ECOSY-Gidrofizika, 526 p. (in Russian).
  27. Kuznetsov, A.S., Ivanov, V.A. and Zima, V.V., 2014. [Features of the Dynamics of Currents near the Southern Coast of Crimea and Prospects for the Use of Information Technology in Field Studies]. 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. 28, pp. 42- 50 (in Russian).
  28. 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).
  29. Korotaev, G., Oguz, T., Nikiforov, A. and Koblinsky, C., 2003. Seasonal, Interannual, and Mesoscale Variability of the Black Sea Upper Layer Circulation Derived from Altimeter Data. Journal of Geophysical Research: Oceans, 108(C4), 3122. doi:10.1029/2002JC001508
  30. Serebryany, A. and Lavrova, O., 2008. [Anticyclonic Eddy on the Northeastern Black Sea Shelf: Joint Analysis of Satellite Images and Acoustic Probing Data of the Water Column]. Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa, 5(2), pp. 206-215 (in Russian).
  31. Demyshev, S.G. and Evstigneeva, N.A., 2016. Modeling Meso- and Sub-Mesoscale Circulation Along the Eastern Crimean Coast Using Numerical Calculations. Izvestiya, Atmospheric and Ocean Physics, 52(5), pp. 560-569. doi:10.1134/S0001433816050042
  32. Ivanov, V.A. and Yankovsky, A.E., 1995. Dynamics of the Crimea Shelf Waters in Summer. Physical Oceanography, 6(3), pp. 201-217. doi:10.1007/BF02197518
  33. Korotaev, G.K., Saenko, O.A. and Koblinsky, C.J., 2001. Satellite Altimetry Observations of the Black Sea Level. Journal of Geophysical Research: Atmospheres, 106(C1), pp. 917-933. doi:10.1029/2000JC900120

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