Abstract
We compare characteristics of short-period internal waves and the mechanisms of their generation in the southwestern part of the Barents Sea and in Avacha Bay of the Pacific Ocean based on in situ data, satellite observations, together with results of a modern global barotropic tidal model. According to in situ data, in the Barents Sea, weakly nonlinear short-period oscillations with a maximum amplitude of 4 m dominate in the region of alternating features of the bottom topography with a mean depth of about 100 m. In Avacha Bay, with a narrow shallow shelf and steep continental slope, strongly nonlinear intense internal waves with amplitudes reaching 8 m are recorded against the background of semidiurnal internal waves. It is found from the satellite data that larger wave trains of surface manifestations of short-period waves are recorded in the Barents Sea when compared to Avacha Bay, both in wavelength and along the length of the leading crest. The directions of propagation of wave manifestations in the studied regions are characterized by a narrow range of variations, which may indicate the dominance of one generation mechanism. An analysis of the TPXO9 atlas data has revealed the similarity of the spatial structure of the semidiurnal tidal waves in the Barents Sea and Avacha Bay, but the maximum speed of tidal currents in the Barents Sea is higher more by factor of three than in Avacha Bay. An assessment of the internal tide generation criteria has made it possible to reveal that the short-period internal waves in the Barents sea are generated at breaking of lee waves in the vicinity of the in situ observation place. In contrast, internal waves in Avacha Bay are caused by the disintergation of internal tide.
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Funding
This work was carried out as part of State Task no. FMWE-2021-0014 (processing of in situ measurement data) and supported by the Russian Foundation for basic research, grant no. 20-35-90054 (support for PhD students, processing of satellite data, and analysis of internal tide generation criteria).
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Translated by E.G. Morozov
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Svergun, E.I., Zimin, A.V., Romanenkov, D.A. et al. Short-Period Internal Waves in Shelf Regions with Intense Tidal Dynamics. Izv. Atmos. Ocean. Phys. 58, 585–597 (2022). https://doi.org/10.1134/S0001433822060160
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DOI: https://doi.org/10.1134/S0001433822060160