Experimental Studies of the Long-Wave Barotropic and Baroclinic Fluctuations in the Shallow Bays and Gulfs of Marginal Seas (Using the Example of Posyet Bay in the Sea of Japan)

V. V. Novotryasov1, ✉, G. V. Shevchenko2

1 V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russian Federationn

2 Institute of Marine Geology and Geophysics, Far Eastern Branch of Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russian Federation

✉ e-mail: vadimnov@poi.dvo.ru

Abstract

Purpose. The purpose of the work is to study the spectral composition and identify the mechanisms of formation of submesoscale and mesoscale variability of hydrological parameters (sea level, temperature, and bottom pressure) in the Posyet Bay coastal waters during the maximum development of the seasonal pycnocline.

Methods and Results. The internal gravity waves (IGW) were recorded using the measurement data on sea level (level gauge), temperature in the pycnocline layer and bottom pressure, as well as the methods for isolating its baroclinic component. Standard methods of spectral analysis and filtration, as well as analytical modeling were applied for assessing the periods of background fluctuations of the bay. It has been established that submesoscale variability is formed by the zero and higher modes of the bay seiche oscillations, as well as the offshore seiches induced by the Poincaré waves. The spectra of temperature and baroclinic pressure have a similar structure, and their decrease in the high-frequency range is described by the law ~ω−3. In the mesoscale range (periods are from hours to minutes), the oscillations at tidal frequencies (M2 and its subharmonics) and quasi-inertial oscillations are revealed. The presence of internal Kelvin waves has been proved, and the maxima in the pressure spectrum at the frequencies ~ 1/16 and 1/17 h−1 are interpreted as the result of their Doppler shift in the coastal current.

Conclusions. The study has confirmed the assumption that the variability of hydrological parameters in the Posyet Bay is of a topographic nature and is formed by a set of resonant processes, including its own and forced seiches, as well as by internal waves exhibiting nonlinear properties. Recording of the baroclinic component of bottom pressure has proven to be an effective method for detecting internal Kelvin waves.

Keywords

Posyet Bay, sea shelf, sea level, seawater temperature, bottom pressure, seiches, offshore seiches, Kelvin internal waves

Acknowledgements

The study was carried out within the framework of the state assignment of the Pacific Oceanological Institute, FEB RAS (Project No. 1240-2210-0072-5).

About the authors

Vadim V. Novotryasov, Leading Researcher of the Department of Ocean & Atmosphere Physics, V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences (43 Baltiyskaya Str., Vladivostok, 690041, Russian Federation), DSc. (Phys.-Math.), Associate Professor, ORCID ID: 0000-0003-2607-9290, SPIN-code: 4584-8071, vadimnov@ poi.dvo.ru

Georgiy V. Shevchenko, Head of the Oceanography Laboratory, Sakhalin Branch of the All-Russian Research Institute of Fisheries and Oceanography (VNIRO) (196 Komsomolskaya Str., Yuzhno-Sakhalinsk, 693023, Russian Federation); Leading Researcher of the Tsunami Laboratory, Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences (1B Nauki Str., Yuzhno-Sakhalinsk, 693023, Russian Federation); DSc. (Phys.-Math.), ORCID ID: 0000-0003-0785-4618, SPIN-code: 8230-2974, shevchenko_zhora@mail.ru

Original russian text

Original Russian Text © V. V. Novotryasov, G. V. Shevchenko, 2026, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 42, Iss. 1, pp. 68–84 (2026)

For citation

Novotryasov, V.V. and Shevchenko, G.V., 2026. Experimental Studies of the Long-Wave Barotropic and Baroclinic Fluctuations in the Shallow Bays and Gulfs of Marginal Seas (Using the Example of Posyet Bay in the Sea of Japan). Physical Oceanography, 33(1), pp. 62-77.

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