Rise in CO2 emissions can mean louder oceans

 And as the oceans grow more acidic, a result of increasing absorption of CO2, the seawater chemistry changes, resulting in fewer reactions and less acoustic energy used. That means sounds will travel farther and be louder.

Tatiana Ilyina and Richard E Zeebe of the University of Hawaii looked at the future impact of this phenomenon.

They report that in high latitudes and deepwater formations (where acidification is expected to be worse), sound absorption could fall 60 per cent by 2100.

So the oceans will not be as quiet — what’s wrong with that? Plenty, potentially.
Most of the chemical absorption of sound occurs at relatively low frequencies, from about 1,000 to 5,000 hertz. Propeller noise and other ship sounds fall in the same range. So this “background” noise, especially prevalent near shipping lanes, will be louder. That may be bad news for marine mammals, which use sounds in the same range for communication while foraging.

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