Tidal oscillations in the Caspian Sea

Long-term hourly data from 12 tide gauge stations were used to examine the character of tidal oscillations in the Caspian Sea. Diurnal and semidiurnal tidal peaks are well-defined in sea level spectra in the Middle and South Caspian basins. High-resolution spectral analysis revealed that the diurnal...

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Bibliographic Details
Published inOceanology (Washington. 1965) Vol. 57; no. 3; pp. 360 - 375
Main Authors Medvedev, I. P., Kulikov, E. A., Rabinovich, A. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.05.2017
Springer Nature B.V
Subjects
Amplitude
Amplitudes
Basins
Diurnal variations
Earth and Environmental Science
Earth Sciences
Fourier analysis
Gravitation
Gravity
Harmonic analysis
High resolution
Marine Physics
Ocean basins
Oceanography
Oscillations
Physical oceanography
Radiational tides
Sea level
Spectra
Spectral analysis
Stations
Tidal constituents
Tidal oscillations
Tidal range
Tide gauges
Tides
Caspian Sea
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Summary:Long-term hourly data from 12 tide gauge stations were used to examine the character of tidal oscillations in the Caspian Sea. Diurnal and semidiurnal tidal peaks are well-defined in sea level spectra in the Middle and South Caspian basins. High-resolution spectral analysis revealed that the diurnal sea level oscillations in the Middle Caspian Basin have a gravitational origin, while those in the South Caspian Basin are mainly caused by radiational effects: the amplitude of diurnal radiational harmonic S 1 is much higher than those of gravitational harmonics О 1 , P 1 , and K 1 . In the North Caspian Basin, there are no gravitational tides and only weak radiational tides are observed. A semidiurnal type of tide is predominant in the Middle and South Caspian basins. Harmonic analysis of the tides for individual annual series with subsequent vector averaging over the entire observational period was applied to estimate the mean amplitudes and phases of major tidal constituents. The amplitude of the M 2 harmonic reaches 5.4 cm in the South Caspian Basin (at Aladga). A maximum tidal range of 21 cm was found at the Aladga station in the southeastern part of the Caspian Sea, whereas the tidal range in the western part of the South Caspian Basin varies from 5 to 10 cm.
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437017020138