What is it about?

The paper shows results of the underwater noise measurements in the Baltic Sea. The noise data were obtained in summer and winter seasons with contrastingly different sound propagation conditions, with using of two omnidirectional hydrophones located inside and outside the seasonal waveguide.

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Why is it important?

The noise indicates their strong dependence on season, as well as on observation depth. Furthermore, it was found that the diel vertical migrations of fishes changes the sound attenuation (due to sound scattering on fish swim bladders) and could noticeably change the noise field inside the seasonal waveguide.

Perspectives

The phenomena of the diel variability of noise opens a way to introduce a passive acoustic spectroscopy of fishes using the ambient sea noise, i.e. it is become possible to estimate sizes (resonance frequencies of fish swim bladder) and concentration of fishes (noise level changes).

Aliaksandr Lisimenka
Maritime Institute in Gdansk (Poland)

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This page is a summary of: Seasonal and diel variability of the underwater noise in the Baltic Sea, The Journal of the Acoustical Society of America, April 2016, Acoustical Society of America (ASA),
DOI: 10.1121/1.4944875.
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