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Currents in the Southwestern Peter the Great Bay, the Sea of Japan, from the Stationary Wavescan Buoy Data in 2016

  • MARINE PHYSICS
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Abstract

Coastal currents are studied based on hourly horizontal velocity data from the SEAWATCH WaveScan buoy moored in the southwestern Peter the Great Bay, the Sea of Japan, from May to December 2016. Using decomposition to empirical orthogonal functions in the depth – time domain and wavelet transform, the vertical structure and temporal variability are analyzed. It is found that in 2016 the current speed simultaneously increased in the upper layer (2–18 m) and decreased in the lower layer (22–42 m) or vice versa. These changes were accompanied by the left- or right-hand side vertical velocity shear and the sign of velocity vector rotation with the depth changed on the 3–7 to 50–70 day timescales. The energy cascades are detected on the timescales of 2 to 80 days and of 2 h to 1 day during the time of the intense atmospheric cyclogenesis, including the typhoon Lionrock, from late August to early September. Inertial oscillations are detected in the 2–38 m layer, gradually weakening with the depth. The signal alternately moving down and up is revealed around the inertial timescale, which is supposedly related to near inertial waves and their reflection from the bottom. The strong events were accompanied by the red or blue Doppler shift of the inertial frequency. The background relative vorticity related to the Doppler shift is estimated for these events and the flow is shown to reach the quasi-geostrophic and, on average, anticyclonic regime.

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ACKNOWLEDGMENTS

The study was carried out as a part of the State Task No. 121021700346-7 for POI FEB RAS. The authors are thankful to A.F. Sergeev, A.A. Voronin, P.E. Scherbinin and other POI colleagues participated in the WAVESCAN maintenance and field work, to M.K. Pichugin for wind stress computation, and to the anonymous reviewer for valuable comments.

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Authors and Affiliations

  1. V.I. Ilꞌichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia

    O. O. Trusenkova, V. B. Lobanov & A. Yu. Lazaryuk

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  1. O. O. Trusenkova
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  2. V. B. Lobanov
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  3. A. Yu. Lazaryuk
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Correspondence to O. O. Trusenkova.

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Trusenkova, O.O., Lobanov, V.B. & Lazaryuk, A.Y. Currents in the Southwestern Peter the Great Bay, the Sea of Japan, from the Stationary Wavescan Buoy Data in 2016. Oceanology 62, 310–323 (2022). https://doi.org/10.1134/S0001437022030146

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  • DOI: https://doi.org/10.1134/S0001437022030146

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