Analysis of the Dispersion Dependence and Vertical Structure of Internal Waves in the White Sea in Experimental Data

Zhegulin G. V., Zimin A. V., Rodionov A. A.

During field work in the summer of 2012 in the White Sea in the south-eastern part of the Throat, and Western and Eastern Solovetsky Salma were carried out experimental studies of short-term variability of the temperature field, having the characteristic properties of internal waves with time scales less than an hour. For piecewise constant and piecewise exponential distribution approximations analytical solutions of the boundary value problem with the depth and density found corresponding dispersion curves for internal waves. The calculation of the eigenfunctions numerical and analytical method produced three density distribution models: exponential (linear), two-layer and three-layer. The characteristics of waves (length, height, period, phase and group velocity), as well as vertical wave structure by calculating its own functions for density models and numerical calculation of the eigenfunctions for an arbitrary density distribution. The smallest difference between the numerical and analytical assessment refers to Eastern Solovetsky Salma. The dispersion characteristics of internal waves for the region Throat derived analytically, are highly dependent on the evaluation of Brunt-Vaisala frequency. It was found that the waves, called uncharacteristic, covered subsurface water column in the neck, and the area in the vicinity of the density of the thermocline in the western Solovetsky Salma.

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