Acid Oceans Also Noisier


co2-whales-400.jpg

Increasing atmospheric CO2 increases the acidity of seawater, which allows sounds, like whale calls, to travel farther.
Image: (c) 2008 MBARI (Base image courtesy of David Fierstein)

The acidification of seawater due to absorption of atmospheric CO2 is also enabling sound waves to travel farther. That’s bad news for marine life, including whales and dolphins, who rely on sound for hunting and communication and who are already stressed by noisy ship traffic and military sonar.

A team from the Monterey Bay Aquarium Research Institute predicts that underwater sounds will travel up to 70 percent farther in some areas in 2050 than they do today. Whales could be heavily impacted. Military sonar already disrupt whale behavior more than 300 miles away. Dolphins and fish that use sound to locate prey, to avoid predators, and to defend their territories, will also be affected.

Think of it as our world suddenly getting way, way brighter, blindingly bright, with no sunglasses anywhere. The study, published in Geophysical Research Letters, used IPCC projections that ocean pH will drop by 0.3 units by 2050—four times faster than the the past 250 years. The researchers also conducted field and lab experiments testing sound conductivity while estimating increases in ocean temperature and reductions in oxygen content, conditions also affecting underwater acoustics.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the Kiriyama Prize and the John Burroughs Medal Award.

THE BIG QUESTION...

as we head into 2020 is whether politics and media will be a billionaires’ game, or a playing field where the rest of us have a shot. That's what Mother Jones CEO Monika Bauerlein tackles in her annual December column—"Billionaires Are Not the Answer"—about the state of journalism and our plans for the year ahead.

We can't afford to let independent reporting depend on the goodwill of the superrich: Please help Mother Jones build an alternative to oligarchy that is funded by and answerable to its readers. Please join us with a tax-deductible, year-end donation so we can keep going after the big stories without fear, favor, or false equivalency.

THE BIG QUESTION...

as we head into 2020 is whether politics and media will be a billionaires’ game, or a playing field where the rest of us have a shot.

Please read our annual column about the state of journalism and Mother Jones' plans for the year ahead, and help us build an alternative to oligarchy by supporting our people-powered journalism with a year-end gift today.

We Recommend

Latest

Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate

We have a new comment system! We are now using Coral, from Vox Media, for comments on all new articles. We'd love your feedback.