Results of Long-Term Monitoring of the Shelf Water Vertical Thermal Struture at the Black Sea Hydrophysical Polygon of RAS

A. P. Tolstosheev✉, S. V. Motyzhev, E. G. Lunev

Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation

✉ e-mail: tolstosheev@marlin-yug.com

Abstract

Purpose. The geographical and climatic features of the Crimean Southern coast condition significant dynamic activity of the water thermal structure. Studies of the temperature vertical variability in the absence of the tides’ dominant affect, permit to specify the upwelling structure and dynamics as well as the characteristics of waves of various origin. Such hardly-forecasted processes, the time scales of which constitute from a few minutes to several days can be revealed and registered only by long-term continuous observations. The aim of the study is to analyze the results of long-term monitoring of the thermal processes in the coastal zone near the Crimean Southern coast. It was performed at the Black Sea hydrophysical scientific polygon.

Methods and Results. In December, 2012 the observation system for operational control of the water temperature vertical distribution was installed at the stationary platform located in the coastal zone of the Black Sea (the Blue Bay) at a distance of ~450 m from the coast. The sea depth under the platform was ~30 m. Digital temperature sensors having precision better than 0.1 °C were installed with 1.5 m intervals in the temperature string of the system. The profiling period was 60 s. The 6.5 year-long experiment with the observation system provided statistically significant and duration-unique serious of data on variability of the thermal processes in the sea coastal region. By early April 2019, the total duration of the system productive functioning was ~900 days. During this period, more than 1300000 temperature profiles were obtained. Based on the data obtained in 2013, the estimates of a seasonal cycle of the temperature synoptic variability are represented. The upwelling events not related to the wind impact are considered.

Conclusions. The long-term data series resulted from the multi-year experiment permit not only to specify, but also to change some of the existing ideas of the thermal processes’ evolution features in shelf zone of the Black Sea. Noted is the expediency of applying the observation system as a segment of the constantly operating network at the coastal polygons for performing hydrophysical measurements in the Black Sea.

Keywords

coastal area, the Black Sea, thermal process, temperature vertical distribution, temperature string, upwelling

Acknowledgements

The authors are grateful to the reviewers for their valuable remarks and methodical aid. The study is carried out within the framework of the state task on theme “Development of the methods of operational oceanology based on the inter-disciplinary studies of the marine environment formation and evolution processes, and mathematical modeling using the data of remote and direct measurements” at financial and technical support of Marlin-Yug LTD.

Original russian text

Original Russian Text © A.P. Tolstosheev, S.V. Motyzhev, E.G. Lunev, 2020, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 36, Iss. 1, pp. 75–87 (2020)

For citation

Tolstosheev, A.P., Motyzhev, S.V. and Lunev, E.G., 2020. Results of Long-Term Monitoring of the Shelf Water Vertical Thermal Struture at the Black Sea Hydrophysical Polygon of RAS. Physical Oceanography, 27(1), pp. 69-80. doi:10.22449/1573-160X-2020-1-69-80

DOI

10.22449/1573-160X-2020-1-69-80

References

  1. Lisichenok, A.D., 2005. Intensive Internal Waves in the Black Sea. In: MHI, 2005. Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources. Sevastopol, MHI. Iss. 12, pp. 49-59 (in Russian).
  2. Liapidevskii, V.Y., Novotryasov, V.V., Khrapchenkov, F.F. and Yaroshchuk, I.O., 2017. Internal Wave Bore in the Shelf Zone of the Sea. Journal of Applied Mechanics and Technical Physics, 58(5), pp. 809-818. https://doi.org/10.1134/S0021894417050066
  3. Ivanov, V.A., Shul’ga, T.Ya., Bagaev, A.V., Medvedeva, A.V., Plastun, T.V., Verzhevskaya, 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. 288-303. doi:10.22449/1573-160X-2019-4-288-304
  4. Pritchard, M. and Weller, R.A., 2005. Observations of Internal Bores and Waves of Elevation on the New England Inner Continental Shelf During Summer 2001. Journal of Geophysical Research, 110(C3), C03020. doi:10.1029/2004JC002377
  5. Badiey, M., Wan, L. and Song, A., 2013. Three-Dimensional Mapping of Evolving Internal Waves During the Shallow Water 2006 Experiment. The Journal of the Acoustical Society of America, 134(1), EL7, pp. EL7-EL13. doi:10.1121/1.4804945
  6. Serebryany, A., 2014. Internal Waves on a Shelf. Hydroacoustics, 17(1), pp. 187-198. Available at: http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.baztech-b5a36445-3bb4-4a8e-ad13-d196625518e9/c/Serebryany.pdf [Accessed: 15 January 2020].
  7. Walter, R.K., Stastna, M., Woodson, C.B. and Monismith, S.G., 2016. Observations of Nonlinear Internal Waves at a Persistent Coastal Upwelling Front. Continental Shelf Research, 117, pp. 100-117. doi:10.1016/j.csr.2016.02.007
  8. Colosi, J.A., Kumar, N., Suanda, S.H., Freismuth, T.M. and MacMahan, J.H., 2018. Statistics of Internal Tide Bores and Internal Solitary Waves Observed on the Inner Continental Shelf off Point Sal, California. Journal of Physical Oceanography, 48(1), pp. 123-143. doi:10.1175/JPO-D-17-0045.1
  9. Ivanov, V.A. and Serebryany, A.N., 1985. Short-period Internal Waves in the Coastal Zone of a Nontidal Sea. Izvestiya. Atmospheric and Oceanic Physics, 21(6), pp. 496-501.
  10. Blatov, A.S. and Ivanov, V.A., 1992. [Hydrology and Hydrodynamics of the Black Sea Shelf Zone (on the Example of the South Coast of Crimea]. Kiev: Naukova Dumka, 244 p. (in Russian).
  11. Serebryany, A.N. and Ivanov, V.A., 2013. Study of Internal Waves in the Black Sea from Oceanographic Platform of Marine Geophysical Institute. Fundamentalnaya i Prikladnaya Gidrofizika, 6(3), pp. 34-45 (in Russian).
  12. Serebryany, A.N., Ivanov, V.A., Kuznetsov, A.S., Khimchenko, E.E., Lavrova, O.Y. and Simonova, Y.V., 2014. [Studies of Internal Waves and Currents in the Black Sea from the Platform of the Marine Hydrophysical Institute in the Summer 2014]. In: MHI, 2014. Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources. Sevastopol, MHI. Iss. 28, pp. 62-70 (in Russian).
  13. Zatsepin, A.G., Silvestrova, K.P., Kuklev, S.B., Piotoukh, V.B. and Podymov, O.I., 2016. Observations of a Cycle of Intense Coastal Upwelling and Downwelling at the Research Site of the Shirshov Institute of Oceanology in the Black Sea. Oceanology, 56(2), pp. 188-199. doi:10.1134/S0001437016020211
  14. Silvestrova, K.P., Zatsepin, A.G. and Myslenkov, S.A., 2017. Coastal Upwelling in the Gelendzhik Area of the Black Sea: Effect of Wind and Dynamics. Oceanology, 57(4), pp. 469-477. doi:10.1134/S0001437017040178
  15. Ocherednik, V.V. and Zapevalov, A.S., 2018. Investigation of the Short-Period Variability of the Temperature Field on the Black Sea Hydrophysical Training Ground of the Institute of Oceanology RAS. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 44-49. doi:10.22449/2413-5577-2018-1-44-49 (in Russian).
  16. Van Haren, H., Groenwegen, R., Laan, M. and Koster, B., 2001. A Fast and Accurate Thermistor String. Journal of Atmospheric and Oceanic Technology, 18(2), pp. 256-265. doi:10.1175/1520-0426(2001)018<0256:AFAATS>2.0.CO;2
  17. Nam, S. and Send, U., 2011. Direct Evidence of Deep Water Intrusions onto the Continental Shelf via Surging Internal Tides. Journal of Geophysical Research: Oceans, 116(C5), C05004. doi:10.1029/2010JC006692

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