Abstract
Six-day temperature records carried out at the three mooring levels revealed isotherm fluctuations in the Denmark Strait sill in July 2018 caused by internal waves. In addition to the field measurements, fluctuations of isopycnals were estimated on the basis of a numerical model. It was shown that the wave height (vertical displacements of water particles) caused by semidiurnal internal tides are approximately 50 m in the region of the sill crossing the strait. The wave height decreases to 30 m over a distance of 100 km from the sill. The internal waves in the northern part of the strait are more intense than in the southern part because the wave propagates in the opposite direction to the mean current. In the southern part the waves and the current propagate to the south, which increases the wavelength and decreases their amplitudes.
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FUNDING
This work was performed within the state assignment of the Shirshov Institute of Oceanology, Russian Academy of Sciences (theme no. 0149-2019-0004). The participation of E.G. Morozov and D.I. Frey and modeling and data analysis were supported by the Russian Foundation for Basic Research (project no. 17-08-00085); the participation of S.V. Gladyshev and the work on profiling were supported by the Russian Foundation for Basic Research (project no. 18-05-00194). The work of A.N. Novigatsky and A.A. Klyuvitkina with the mooring were supported by the Russian Science Foundation (grant no. 14-50-00095).
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Morozov, E.G., Frey, D.I., Gladyshev, S.V. et al. Internal Tides in the Denmark Strait. Izv. Atmos. Ocean. Phys. 55, 295–302 (2019). https://doi.org/10.1134/S0001433819030034
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DOI: https://doi.org/10.1134/S0001433819030034