Contrary to some previous, highly publicized, reports, ocean acidification is not likely to worsen the hearing of whales and other animals, according to a Woods Hole Oceanographic Institution (WHOI) scientist who studies sound propagation in the ocean.
Tim Duda, of WHOI's Applied Ocean Physics & Engineering Department, undertook a study in response to warnings that as the ocean becomes more acidic -- due to elevated levels of atmospheric carbon dioxide (CO2)--noise from ships will be able to travel farther and possibly interfere with whales and other animals that rely on sound to navigate, communicate, and hunt.
Duda and WHOI scientists Ilya Udovydchenkov, Scott Doney, and Ivan Lima, along with colleagues at the Naval Postgraduate School, designed mathematical models of sound propagation in the oceans. Their models found that the increase would be, at most, 2 decibels by the year 2100 -- a negligible change compared with noise from natural events such as storms and large waves. Noise levels are predicted to change even less than this in higher-noise areas near sources such as shipping lanes, Duda said.
Their work is published in the September 2010 issue of the Journal of the Acoustical Society of America.
- Ilya A. Udovydchenkov, Timothy F. Duda, Scott C. Doney, and Ivan D. Lima. Modeling deep ocean shipping noise in varying acidity conditions. J. Acoust. Soc. Am., 128 EL130 (2010) [link]
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