Mechanisms of Variability of the Black and Marmara Seas Circulation Based on Numerical Energy Analysis

S. G. Demyshev, O. A. Dymova✉, N. V. Markova

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: olgdymova@mhi-ras.ru

Abstract

Purpose. The study is purposed at analyzing the physical mechanisms of formation of the Black and Marmara seas circulation structures based on the numerical experiments with climatic boundary conditions.

Methods and Results. To investigate the reasons for the formation of circulation features, the energetic approach was applied that permitted to calculate the work of the forces affecting the marine environment. Location in the same geographical region determines similarity of atmospheric conditions for the Black and Marmara seas, and a clearly pronounced two-layer water stratification in both basins is related to a significant difference in salinity of the Black Sea and Mediterranean waters. To analyze the mechanisms of circulation variability, the mean and eddy fields formed under the impact of climatic atmospheric forcing and calculated using a numerical model of sea dynamics were considered. Wind influence, thermohaline fluxes on the sea surface, buoyancy work, friction, and diffusion were quantitatively assessed based on calculation of the Lorenz energy cycle components. The common features were found in the mechanisms of mesoscale variability, and the differences – in the mechanisms of large-scale circulation variability.

Conclusions. It is shown that the main source of energy for the Black Sea mean circulation is wind stress work, and as for the Marmara Sea, the dominant factor is buoyancy work. For both basins, variability of the eddy kinetic energy characterizing the mesoscale dynamics is conditioned by baroclinic instability. At that, about a quarter of the available potential energy in the Black Sea, and about a half of it in the Marmara Sea is transformed into the eddy kinetic energy.

Keywords

Black Sea, Marmara Sea, circulation, kinetic energy, available potential energy, Lorenz energy cycle, dissipation, baroclinic instability, buoyancy, wind stress

Acknowledgements

The work was carried out within the framework of state assignment of FSBSI FRC MHI on theme No. FNNN-2021-0004.

Original russian text

Original Russian Text © S. G. Demyshev, O. A. Dymova, N. V. Markova, 2023, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 39, Iss. 6, pp. 893–908 (2023)

For citation

Demyshev, S.G., Dymova, O.A. and Markova, N.V., 2023. Mechanisms of Variability of the Black and Marmara Seas Circulation Based on Numerical Energy Analysis. Physical Oceanography, 30(6), pp. 851-865.

References

  1. Stanev, E.V., Grashorn, S. and Zhang, Y.J., 2017. Cascading Ocean Basins: Numerical Simulations of the Circulation and Interbasin Exchange in the Azov-Black-Marmara-Mediterranean Seas System. Ocean Dynamics, 67, pp. 1003-1025. doi:10.1007/s10236-017-1071-2
  2. Mizyuk, A.I., Korotaev, G.K., Grigoriev, A.V., Puzina, O.S. and Lishaev, P.N., 2019. Long-Term Variability of Thermohaline Characteristics of the Azov Sea Based on the Numerical Eddy-Resolving Model. Physical Oceanography, 26(5), pp. 438-450. doi:10.22449/1573-160X-2019-5-438-450
  3. Diansky, N.A., Fomin, V.V., Korshenko, E.A. and Kabatchenko, I.M., 2020. Hindcast and Operational Forecasting System of Hydrometeorological Characteristics for the Sea of Azov and Kerch Strait. Ecology Economy Informatics. Geoinformation Technologies and Space Monitoring, 2(5), pp. 131-140. doi:10.23885/2500-123X-2020-2-5-131-140 (in Russian).
  4. Ilicak, M., Federico, I., Barletta, I., Mutlu, S., Karan, H., Ciliberti, S.A., Clementi, E., Coppini, G. and Pinardi, N., 2021. Modeling of the Turkish Strait System Using a High Resolution Unstructured Grid Ocean Circulation Model. Journal of Marine Science and Engineering, 9(7), 769. doi:10.3390/jmse9070769
  5. Cessi, P., Pinardi, N. and Lyubartsev, V., 2014. Energetics of Semienclosed Basins with Two-Layer Flows at the Strait. Journal of Physical Oceanography, 44(3), pp. 967-979. doi:10.1175/JPO-D-13-0129.1
  6. Stanev, E.V., 1990. On the Mechanisms of the Black Sea Circulation. Earth-Science Reviews, 28(4), pp. 285-319. doi:10.1016/0012-8252(90)90052-W
  7. Demyshev, S.G., 2004. Energy of the Black Sea Climatic Circulation. Part I: Discrete Equations of the Time Rate of Change of Kinetic and Potential Energy. Meteorologiya i Gidrologiya, (9), pp. 65-80 (in Russian).
  8. Pavlushin, A.А., Shapiro, N.B. and Mikhailova, E.N., 2019. Energy Transitions in the Two-Layer Eddy-Resolving Model of the Black Sea. Physical Oceanography, 26(3), pp. 185-201. doi:10.22449/1573-160X-2019-3-185-201
  9. Puzina, O.S., Kubryakov, A.A. and Mizyuk, A.I., 2021. Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part. Physical Oceanography, 28(1), pp. 38-51. doi:10.22449/1573-160X-2021-1-37-51
  10. Aydoğdu, A., Pinardi, N., Özsoy, E., Danabasoglu, G., Gürses, Ö. and Karspeck A., 2018. Circulation of the Turkish Straits System between 2008-2013 under Complete Atmospheric Forcings. Ocean Science, 14(5), pp. 999-1019. doi:10.5194/os-14-999-2018
  11. Demyshev, S.G. and Dovgaya, S.V., 2021. Analysis of Seasonal Energy Characteristics of the Marmara Sea Upper Layer Dynamics. Physical Oceanography, 28(5), pp. 471-485. doi:10.22449/1573-160X-2021-5-471-485
  12. Demyshev, S.G., 2012. A Numerical Model of Online Forecasting Black Sea Currents. Izvestiya, Atmospheric and Oceanic Physics, 48(1), pp. 120-132. doi:10.1134/S0001433812010021
  13. Pacanowski, R.C. and Philander, S.G.H., 1981. Parameterization of Vertical Mixing in Numerical Models of Tropical Oceans. Journal of Physical Oceanography, 11(11), pp. 1443-1451. doi:10.1175/1520-0485(1981)011%3C1443:POVMIN%3E2.0.CO;2
  14. Gruzinov, V.M., Diansky, N.A., Dyakov, N.N. and Stepanov, D.V., 2018. Estimates of Parameters of Edge Internal Waves in the Black Sea. In: SOI, 2018. Proceedings of N.N. Zubov State Oceanographic Institute. Moscow: Rosgidromet. Iss. 219, pp. 205-226 (in Russian).
  15. Efimov, V.V. and Timofeev, N.A., 1990. Heat Balance Exploration of the Black and Azov Seas. Obninsk: VNIIGMI-MTsD, 236 p. (in Russian).
  16. Staneva, J.V. and Stanev, E.V., 1998. Oceanic Response to Atmospheric Forcing Derived from Different Climatic Data Sets. Intercomparison Study for the Black Sea. Oceanologica Acta, 21(3), pp. 393-417. doi:10.1016/S0399-1784(98)80026-1
  17. Dorofeev, V.L. and Korotaev, G.K., 2004. Assimilation of the Data of Satellite Altimetry in an Eddy-Resolving Model of Circulation of the Black Sea. Physical Oceanography, 14(1), pp. 42-56. doi:10.1023/B:POCE.0000025369.39845.c3
  18. Simonov, A.I. and Altman, E.N., eds., 1991. Hydrometeorology and Hydrochemistry of Seas in the USSR. Vol. IV. Black Sea. Issue 1. Hydrometeorological Conditions. Saint Petersburg: Gidrometeoizdat, 429 p. (in Russian).
  19. Demyshev, S.G., Ivanov, V.A. and Markova, N.V., 2009. Analysis of the Black-Sea Climatic Fields below the Main Pycnocline Obtained on the Basis of Assimilation of the Archival Data on Temperature and Salinity in the Numerical Hydrodynamic Model. Physical Oceanography, 19(1), pp. 1-12. doi:10.1007/s11110-009-9034-x
  20. Beşiktepe, Ş.T., Sur, H.I., Özsoy, E., Latif, M.A., Oǧuz, T. and Ünlüata, Ü., 1994. The Circulation and Hydrography of the Marmara Sea. Progress in Oceanography, 34(4), pp. 285-334. doi:10.1016/0079-6611(94)90018-3
  21. Zapevalov, A.S., 2005. Seasonal Variability of Vertical Temperature and Salinity Distribution in the Sea of Marmara. Meteorologiya i Gidrologiya, (2), pp. 78-84 (in Russian).
  22. Lorenz, E.N., 1955. Available Potential Energy and the Maintenance of the General Circulation. Tellus, 7(2), pp. 157-167. doi:10.3402/tellusa.v7i2.8796
  23. Puzina, О.S. and Mizyuk, A.I., 2019. [Study of the Influence of Bottom Friction on Large-Scale Circulation of the Black Sea Based on Numerical Modeling]. In: MHI, 2019. Proceedings of IV All-Russian Scientific Conference of Young Scientists “Comprehensive Research of the World Ocean”. Sevastopol: MHI, pp. 145-146 (in Russian).
  24. Ivanov, V.A. and Belokopytov, V.N., 2013. Oceanography of the Black Sea. Sevastopol: MHI, 210 p.
  25. Oguz, T., Malanotte-Rizzoli, P. and Aubrey, D., 1995. Wind and Thermohaline Circulation of the Black Sea Driven by Yearly Mean Climatological Forcing. Journal of Geophysical Research: Oceans, 100(C4), pp. 6845-6864. doi:10.1029/95JC00022
  26. Zatsepin, A.G., Emel’yanov, S.V., Kremenetskiy, V.V., Poyarkov, S.G., Stroganov, O.Yu., Denisov, E.S., Stanichnaya, R.R. and Stanichny, S.V., 2005. Effect of Bottom Slope and Wind on the Near-Shore Current in a Rotating Stratified Fluid: Laboratory Modeling for the Black Sea. Oceanology, 45(1), pp. 13-26.
  27. Kubryakov, A.A., Stanichny, S.V., Zatsepin, A.G. and Kremenetskiy, V.V., 2016. Long-Term Variations of the Black Sea Dynamics and Their Impact on the Marine Ecosystem. Journal of Marine Systems, 163, pp. 80-94. doi:10.1016/j.jmarsys.2016.06.006
  28. Sannino, G., Sözer, A. and Özsoy E., 2017. A High-Resolution Modelling Study of the Turkish Straits System. Ocean Dynamics, 67(3–4), pp. 397-432. doi:10.1007/s10236-017-1039-2
  29. Alpar, B. and Yüce, H., 1998. Sea-Level Variations and Their Interactions between the Black Sea and the Aegean Sea. Estuarine Coastal and Shelf Science, 46(5), pp. 609-619. doi:10.1006/ecss.1997.0285

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