глава в монографии

En

Springer Geology

ISSN:21979545

2023

10.1007/978-3-031-16575-7_18

QTEUQY

Influence of the critical latitude on tidal internal waves of frequency M2 (period 12.4 h) is shown on the example of moored measurements. The critical latitude for internal waves M2 is latitude 74.5° N. North of this latitude the temperature spectra reveal only the S2 peak (period 12.0 h), while the current spectra show two peaks M2 and S2. Tidal internal waves in the Arctic seas of Russia are analyzed. The problem is solved on the basis of a numerical model developed by V.I. Vlasenko. As a result of calculations and analysis, a map of the amplitudes of semidiurnal internal tidal waves in the Arctic seas has been constructed. The maximum amplitudes of internal tidal waves occur over underwater slopes. Very large amplitudes of internal tides were found in the Kara Gates. Internal waves in the Kara Gates Strait were studied on the basis of moored measurements and towed CTD-profilers in the scanning mode. Internal waves turned out to be extremely large and their dynamics is close to similar waves in the Strait of Gibraltar. Waves with heights of up to 70 m are directed towards the Barents Sea. The opposing current decreases the wavelength, and, consequently, the amplitude of internal waves increases. The influence of tidal internal waves on the formation of the Great Siberian Polynya in the Laptev Sea was found. Above the shelf slope near the 20 m isobath, the amplitudes of internal waves are maximum and lead to mixing with a deeper warm water layer. The short-period internal waves under the ice and their influence on the fluctuations of the ice cover are investigated. When solving problems about internal waves, the rigid lid boundary condition is not completely justified. This is confirmed by measurements under the ice. The tsunami wave generated by the motion of the glacier in Svalbard was studied. A tsunami wave is similar in properties to a landslide tsunami. The wave amplitude was 30 cm, the period was 93 s, the period of disturbances after the wave was about one hour. Comparison of the spectra of ice oscillations, which are caused by various wave processes: tide, seiche oscillations, wind waves and swell, internal waves, and tsunami wave is presented. This is a review paper of long term field and numerical research. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2023-01-27 12:31:19