The Energy Spectrum of the Current Velocity in the Deep Part of the Black Sea

In 2016–2017, the yearly long measurements of the current velocities were carried out at 100 m depth below the thermocline and at 1700 m depth for the first time, which was about 100 m above the seabed using the mooring station in the deep central part of the Black Sea. The analysis of this new data...

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Bibliographic Details
Published in:Doklady earth sciences 2019-10, Vol.488 (2), p.1222-1226
Main Authors: Klyuvitkin, A. A., Ostrovskii, A. G., Lisitzin, A. P., Konovalov, S. K.
Format: Article
Language:English
Subjects:
Analysis
Blue shift
Current velocity
Depth
Earth and Environmental Science
Earth Sciences
Energy
Energy spectra
Ocean bottom
Ocean floor
Oceanology
Slopes
Thermocline
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Summary:In 2016–2017, the yearly long measurements of the current velocities were carried out at 100 m depth below the thermocline and at 1700 m depth for the first time, which was about 100 m above the seabed using the mooring station in the deep central part of the Black Sea. The analysis of this new dataset allowed us to uncover the following. In the near-bottom layer, significant current velocities were recorded reaching a peak magnitude of 0.13 m/s. Near the frequency of 1 × 10 –6 Hz, in the transition region of the energy spectrum, the spectral energy of the deep current was close to that observed in the same range in the sea layer below the thermocline. In the range of the balanced geostrophic motions at a depth of 1700 m, the energy spectrum had a slope of –2.8, which should be compared to the spectrum slope of –1.8 obtained for the current below the thermocline at the depth of 100 m. Regular strong currents were observed around the local inertial frequency f I . There was a “blue shift” of the inertial maximum up to 5% with respect to f I in the energy spectrum.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X1910012X