US: Ships” propellers create low-frequency hums that can travel hundreds of kilometers or more in the deep ocean. Scientists have now modeled this shipping noise on a global scale. The world-wide maps will be presented for the first time at the 21st International Congress on Acoustics (ICA 2013)in Montreal.
“The most important thing about these maps is that seeing the sound can get people thinking about its effects,” says Michael Porter, President and CEO of Heat, Light, and Sound Research, Inc., a company that has been working with the US Office of Naval Research and the National Oceanic and Atmospheric Administration to create models of the global ocean soundscape.
The maps show shipping noise spreading across the ocean in a diffuse haze. The highest levels of noise appear in the northern parts of the Atlantic and Pacific Oceans and along popular shipping passages like the Suez Canal. There are also interesting areas of relative quiet, for example across the middle of the Atlantic Ocean.
Source: Space Daily