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Vertical structure of the acoustic characteristics of deep scattering layers in the ocean

Vertical structure of the acoustic characteristics of deep scattering layers in the ocean Abstract Quantitative data on the vertical structure of the acoustic characteristics of deep scattering layers in the ocean are obtained for the first time from multiple full-scale measurements. The measurement procedure used to obtain the acoustic data for thousands of geographic points of the World Ocean in the frequency range from 3 to 20 kHz is briefly described. A simplified model of the vertical structure under study is suggested in the form of several scattering sheets that are split in depth. The parameters of the model are the depths of the sheets, the contribution of every sheet to the total column strength, and the mean backscattering coefficient corresponding to every sheet. The model is illustrated by the description of the daytime structure along five sections in the Atlantic Ocean; the lengths of these sections measure up to several thousand kilometers. The parameters of the model are shown to depend on the oceanic conditions and the sounding frequencies. The latter is evidence that, depending on frequency, the scattering is governed by different populations of the scattering layer inhabitants differently responding to variations in hydrology. In particular, for sections crossing powerful currents, the changes in the vertical structure and the variations the model parameters essentially depend on the frequency of sound. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acoustical Physics Springer Journals

Vertical structure of the acoustic characteristics of deep scattering layers in the ocean

Andreeva, I. B.; Galybin, N. N.; Tarasov, L. L.
Acoustical Physics , Volume 46 (5): 6 – Sep 1, 2000
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References (3)

Publisher
Springer Journals
Copyright
2000 MAIK "Nauka/Interperiodica"
ISSN
1063-7710
eISSN
1562-6865
DOI
10.1134/1.1310372
Publisher site
See Article on Publisher Site

Abstract

Abstract Quantitative data on the vertical structure of the acoustic characteristics of deep scattering layers in the ocean are obtained for the first time from multiple full-scale measurements. The measurement procedure used to obtain the acoustic data for thousands of geographic points of the World Ocean in the frequency range from 3 to 20 kHz is briefly described. A simplified model of the vertical structure under study is suggested in the form of several scattering sheets that are split in depth. The parameters of the model are the depths of the sheets, the contribution of every sheet to the total column strength, and the mean backscattering coefficient corresponding to every sheet. The model is illustrated by the description of the daytime structure along five sections in the Atlantic Ocean; the lengths of these sections measure up to several thousand kilometers. The parameters of the model are shown to depend on the oceanic conditions and the sounding frequencies. The latter is evidence that, depending on frequency, the scattering is governed by different populations of the scattering layer inhabitants differently responding to variations in hydrology. In particular, for sections crossing powerful currents, the changes in the vertical structure and the variations the model parameters essentially depend on the frequency of sound.

Journal

Acoustical Physics – Springer Journals

Published: Sep 1, 2000

Keywords: Acoustics

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