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Water Exchange between the Northern and Middle Caspian

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Abstract

The Caspian Sea water dynamics on the boundary of its northern and central basins is considered. A high-resolution numerical model (with a grid step of ~2 km) has been used to reproduce the mesoscale structure of currents. The results of two experiments are presented: a realistic reconstruction of the sea circulation in 2003 and an idealized one with an artificial forcing. The realistic calculation considers the water exchange between the two basins, which occurs primarily due to coastal jet currents near Tyub-Karagan Peninsula in the east and near the Agrakhan Peninsula in the west. The formation and evolution of these currents under various synoptic situations are analyzed, and their flow rates are quantitatively estimated. The effect of contrasting water intrusions caused by these currents on the salinity field in both basins with highly different haline regimes is estimated. In particular, the western current (WC) is shown to increase the sea surface salinity (SSS) in the Northern Caspian and decrease its value in the Middle Caspian by almost 1–2 psu/year. The water exchange in the east is asymmetric: the northern current increases salinity in the northern basin by 2–3 psu/year, while the southern current decreases the average SSS in the central basin by only around 0.5 psu/year; in this case, the southern current occurs stably only in June and July. The idealized experiment simulates the Caspian water dynamics for winds of various points: from 0° to 350° with a step of 10°. The flow rates of both western and eastern currents have a sinusoidal dependence on the wind direction: their maxima are reached with winds of 40° and 220° points for the WC and with 120° and 300° points for the eastern current (EC). This study also analyzes the establishment of quasi-steady-state sea circulation at a constant wind.

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REFERENCES

  1. Hydrometeorology and Hydrochemistry of the Soviet Seas, Vol. 6: The Caspian Sea, No. 1: Hydrometeorological Conditions, Ed. by F. S. Terziev, A. N. Kosarev, and A. A. Kerimov (Gidrometeoizdat, St. Petersburg, 1992) [in Russian].

  2. A. N. Kosarev and V. S. Tuzhilkin, Climatic Thermohaline Fields in the Caspian Sea (Sorbis, Moscow, 1995) [in Russian].

    Google Scholar 

  3. A. I. Ginzburg, A. G. Kostyanoi, D. M. Solov’ev, and N. A. Sheremet, “Upwelling structure at the western coast of the Central Caspian Sea (according to satellite observations),” Issled. Zemli Kosmosa, No. 4, 76–85 (2005).

    Google Scholar 

  4. The Volga Estuary: Hydromorphological processes, Pollutant Regimen, and the Effects of Caspian Sea Level Variations, Ed. by V. F. Polonskii, V. N. Mikhailov, and S. V. Kir’yanov (GEOS, Moscow, 2008) [in Russian].

    Google Scholar 

  5. R. A. Ibraev, Mathematical Modeling of Thermohydrodynamics Processes in the Caspian Sea (GEOS, Moscow, 2008) [in Russian].

    Google Scholar 

  6. A. B. Kara, A. J. Wallcraft, E. J. Metzger, and M. Gündüz, “Impacts of freshwater on the seasonal variations of surface salinity and circulation in the Caspian Sea,” Cont. Shelf Res. 30 (10–11), 1211–1225 (2010). https://doi.org/10.1016/j.csr.2010.03.011

    Article  Google Scholar 

  7. V. N. Zyryanov, “Hydrodynamic basis of formation of large-scale water circulation in the Caspian Sea: 2. Numerical calculations,” Water Resour. 43, 292–305 (2016). https://doi.org/10.1134/S0097807816020184

    Article  Google Scholar 

  8. L. P. Ostroumova and V. F. Polonskii, “Water balance model of the North Caspian and its separate parts and estimation of river water inflow to the Middle Caspian Sea,” Trudy GOIN, No. 213, 343–355 (2011) [in Russian].

    Google Scholar 

  9. O. Yu. Lavrova, A. G. Kostyanoi, S. A. Lebedev, M. I. Mityagina, A. I. Ginzburg, and N. A. Sheremet, Complex Satellite Monitoring of the Russian Seas (IKI RAN, Moscow, 2011) [in Russian].

    Google Scholar 

  10. S. A. Lebedev, A. G. Kostyanoi, and A. I. Ginzburg, in Mater. III Int. Sci.-Pract. Conf. “Aspects of Applied Geology, Geophysics, and Geoecology Using Modern Information Technology” (Maikop, 11–14 May 2015) (IP Kucherenko V.O., Maikop, 2015), pp. 146–179.

  11. G. S. Dyakonov and R. A. Ibrayev, “Long-term evolution of Caspian Sea thermohaline properties reconstructed in an eddy-resolving ocean general circulation model,” Ocean Sci. 15, 527–541 (2019). https://doi.org/10.5194/os-15-527-2019

    Article  Google Scholar 

  12. R. A. Ibrayev, E. Özsoy, C. Schrum, and H. I. Sur, “Seasonal variability of the Caspian Sea three-dimensional circulation, sea level and air-sea interaction,” Ocean Sci. 6, 311–329 (2010). https://doi.org/10.5194/os-6-311-2010

    Article  Google Scholar 

  13. S. K. Popov, V. I. Batov, V. V. Elisov, and A. L. Lobov, “Advanced technology of the Caspian Sea currents and level forecasting,” Zashch. Okr. Sredy Neftegaz. Kompl., No. 5, 53–59 (2013).

  14. M. Gündüz and E. Özsoy, “Modeling seasonal circulation and thermohaline structure of the Caspian Sea,” Ocean Sci. 11, 259–292 (2014). https://doi.org/10.5194/os-10-459-2014

    Article  Google Scholar 

  15. N. A. Diansky, V. V. Fomin, T. Yu. Vyruchalkina, and A. V. Gusev, “Simulation of the Caspian Sea circulation with calculation of atmospheric forcing using the WRF model,” Tr. Karel. Nauch. Tsentra RAN, No. 5, 21–34 (2016). https://doi.org/10.17076/lim310

    Article  Google Scholar 

  16. S. K. Popov, A. L. Lobov, G. A. Monakhova, and K. I. Asaeva, “Use of a dynamic hydrometeorological model for the calculations of water exchange and pollutant transfer between different parts of the Caspian Sea,” Trudy GOIN, No. 216, 340–357 (2015).

    Google Scholar 

  17. S. A. Lebedev and A. G. Kostianoy, “Interannual variability of water exchange anomalies between the Northern, Middle and Southern Caspian based on satellite altimetry data,” Ecol. Montenegr. 25, 106–115 (2019).

    Article  Google Scholar 

  18. J. Shukla, Seamless Prediction of Weather and Climate: A New Paradigm for Modeling and Prediction Research. US NOAA Climate Test Bed Joint Seminar Series (NOAA, Camp Springs, MD, 2009).

    Google Scholar 

  19. B. Hoskins, “The potential for skill across the range of the seamless weather-climate prediction problem: a stimulus for our science,”. Q. J. R. Meteorol. Soc. 139, 573–584 (2013). https://doi.org/10.1002/qj.1991

    Article  Google Scholar 

  20. G. S. Dyakonov and R. A. Ibrayev, “Reproduction of interannual variability of the Caspian Sea level in a high-resolution hydrodynamic model,” Oceanology (Engl. Transl.), 58, 8–18 (2018). https://doi.org/10.7868/S0030157418010021

  21. G. S. Dyakonov and R. A. Ibraev, “Dynamics of Caspian Sea waters over the Apsheron Sill in 2003,”Phys. Oceanogr. V. 26 Iss. 6. P. 633–645 (2019). https://doi.org/10.22449/1573-160X-2019-6-557-568

  22. V. S. Arkhipkin, A. L. Bondarenko, D. L. Vedev, and A. N. Kosarev, “Specific water circulation at the eastern coast of Central Caspian region,” Vodn. Resur., No. 6, 36–43 (1992).

  23. S. M. Griffies and R. W. Hallberg, “Biharmonic friction with a Smagorinsky-like viscosity for use in large-scale eddy-permitting ocean models,” Mon. Weather Rev. 128, 2935–2946 (2000). https://doi.org/10.1088/1742-6596/16/1/048

    Article  Google Scholar 

  24. D. P. Dee et al., “The ERA-Interim reanalysis: configuration and performance of the data assimilation system,” Q. J. R. Meteorol. Soc. 137, 553–597 (2011). https://doi.org/10.1002/qj.828

    Article  Google Scholar 

  25. M. Gündüz, B. Kara, A. Wallcraft, and J. Metzger, “Application of creeping sea-fill methodology to the wind speed over the Caspian Sea,” Rapp. Comm. Int. Mer Medit. 38, 155 (2007).

    Google Scholar 

  26. A. B. Kara, A. J. Wallcraft, and H. E. Hurlburt, “A correction for land contamination of atmospheric variables near land-sea boundaries,” J. Phys. Oceanogr. 37, 803–818 (2007). https://doi.org/10.1175/JPO2984.1

    Article  Google Scholar 

  27. G. S. Dyakonov, R. A. Ibraev, and P. O. Shishkova, “Assessment of data quality of the ERA-Interim reanalysis in the Caspian Sea region,” Russ. Meteorol. Hydrol. 2020 (in press).

  28. V. V. Voevodin, S. A. Zhumatii, S. I. Sobolev, A. S. Antonov, P. A. Bryzgalov, D. A. Nikitenko, K. S. Stefanov, and V. V. Voevodin, “Practical use of Lomonosov supercomputer,” Otkrytye sistemy, No. 7, 36–39 (2012).

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ACKNOWLEDGMENTS

The numerical calculations were performed using the resources of the Joint Supercomputer Center at the Russian Academy of Sciences and the Supercomputer Center at Moscow State University [28].

Funding

This work was conducted at the Marchuk Institute of Numerical Mathematics, Russian Academy of Sciences, as part of the state task of the Federal Agency of Scientific Organizations of Russia, project no. 0015-2014-0010, and supported by the Russian Foundation for Basic Research, project no. 17-05-01282-а.

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Correspondence to G. S. Dyakonov.

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Translated by V. Arutyunyan

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Dyakonov, G.S., Ibrayev, R.A. Water Exchange between the Northern and Middle Caspian. Izv. Atmos. Ocean. Phys. 56, 279–288 (2020). https://doi.org/10.1134/S0001433820030044

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