Modeling deep ocean shipping noise in varying acidity conditions

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Date
2010-08-19
Authors
Udovydchenkov, Ilya A.
Duda, Timothy F.
Doney, Scott C.
Lima, Ivan D.
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DOI
10.1121/1.3402284
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Keywords
Acoustic noise
Acoustic wave absorption
Ocean chemistry
pH
Seawater
Ships
Underwater sound
Abstract
Possible future changes of ambient shipping noise at 0.1–1 kHz in the North Pacific caused by changing seawater chemistry conditions are analyzed with a simplified propagation model. Probable decreases of pH would cause meaningful reduction of the sound absorption coefficient in near-surface ocean water for these frequencies. The results show that a few decibels of increase may occur in 100 years in some very quiet areas very far from noise sources, with small effects closer to noise sources. The use of ray physics allows sound energy attenuated via volume absorption and by the seafloor to be compared.
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Author Posting. © Acoustical Society of America, 2010. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 128 (2010): EL130–EL136, doi:10.1121/1.3402284.
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Journal of the Acoustical Society of America 128 (2010): EL130–EL136
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