Physical Fields of Ship, Ocean and Atmosphere
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-2-10

Kosheleva A., Yaroshchuk I., Shvyrev A., Samchenko A., Pivovarov A., Gulin O., Korotchenko R., Yaroshchuk E.

ALEXANDRA KOSHELEVA, ResearcherID: L-1171-2018, ORCID: 0000-0001-6508-6325, Scopus ID: 6603109229, e-mail: kosheleva@poi.dvo.ru 
IGOR YAROSHCHUK, Doctor of Physics and Mathematical Sciences, Head of Laboratory, e-mail: yaroshchuk@poi.dvo.ru
ALEKSEY SHVYREV, Candidate of Physics and Mathematical Sciences, Senior Researcher, e-mail: shvyrev@poi.dvo.ru
ALEXANDER SAMCHENKO, Candidate of Geographical Sciences, Senior Researcher, e-mail: samchenco@poi.dvo.ru
ALEXANDER PIVOVAROV, Researcher, e-mail: pivovarov@poi.dvo.ru
OLEG GULIN, Doctor of Physics and Mathematical Sciences, Leading Researcher, e-mail: gulinoe@poi.dvo.ru
ROMAN KOROTCHENKO, Candidate of Engineering Sciences, Senior Researcher, e-mail: romankor@mail.ru
ELENA YAROSHCHUK, Researcher, e-mail: e.yaroshchuk@poi.dvo.ru
V.I. Il’ichev Pacific Oceanological Institute, FEB RAS
Vladivostok, Russia

Specific features of high-frequency component of background internal gravity waves on the shelf of the Sea of Japan

Abstract: To solve both direct and inverse problems of practical hydroacoustics, one needs a set of statistical phenomenological models of spatiotemporal variations of sound speed. As a rule, such variations are determined by internal gravity waves (IGW), which makes the problem of developing adequate statistical models of IGW a pending issue. In this paper, based on results of the experimental data processing, the characteristics of high-frequency (exceeding 2.5 cycles/h) component of the background IGW are analyzed. Field observations were carried out by the authors on the shelf in the southwestern part of Peter the Great Bay of the Sea of Japan in spring, summer, and autumn seasons over the past ten years. Analysis of the most intense isotherms demonstrates that the temperature variations can be considered Gaussian with sufficient accuracy. This fact allowed the authors to develop and apply a randomization technique for the spectral representation of a random field (the IGW covariance matrix) to construct a randomized statistical model from which it is possible to select some statistical implementations of the IGW field for solving specific applied problems of hydroacoustics.
Keywords: internal waves, hydro-physical fields, experimental studies, phenomenological model, shelf zone.

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