Close

Forgot your password?

Choose a newsletter




Premium access provided by ENSTA

Your premium access provided by ENSTA

Enter your email to begin

Premium access granted to you by NRC Q

You have been given free premium access to Worldcrunch for 8 weeks thanks to NRC Q.

Enter your email to begin

Premium access granted to you by EM-LYON

You have been given free premium access to Worldcrunch for 8 weeks thanks to EM-LYON.

Enter your email to begin

Premium access granted to you by Goldsmiths

You have been given free premium access to Worldcrunch for 8 weeks thanks to Goldsmiths.

Enter your email to begin

Premium access granted to you by Worldcrunch HQ

You have been given free premium access to Worldcrunch for 8 weeks thanks to Worldcrunch HQ.

Enter your email to begin

Premium access granted to you by MINES Alès Alumni

You have been given free premium access to Worldcrunch for 8 weeks thanks to MINES Alès Alumni.

Enter your email to begin

Premium access granted to you by ESCP Europe Alumni

You have been given free premium access to Worldcrunch for 8 weeks thanks to ESCP Europe Alumni.

Enter your email to begin

Premium access granted to you by IONIS Education Group

You have been given free premium access to Worldcrunch for 8 weeks thanks to IONIS Education Group.

Enter your email to begin

Premium access granted to you by SOAS University of London

You have been given free premium access to Worldcrunch for 8 weeks thanks to SOAS University of London.

Enter your email to begin

Premium access granted to you by Contact Expats

You have been given free premium access to Worldcrunch for 8 weeks thanks to Contact Expats.

Enter your email to begin

Premium access granted to you by Financial Review Beyond

You have been given free premium access to Worldcrunch for 8 weeks thanks to Financial Review Beyond.

Enter your email to begin

Premium access granted to you by MinnPost

You have been given free premium access to Worldcrunch for 6 months thanks to MinnPost.

Enter your email to begin

Premium access granted to you by Expatica

You've been given FREE premium access to Worldcrunch

Enter your email to begin

Worldcrunch

Trying To Spot The Ocean’s "Plastic Soup" From Up High

Although 3.5 million tons of garbage are floating in the North Pacific, most of it is hard to track down. Could satellites help spot this elusive yet lethal garbage patch?

Article illustrative image Partner logo Plastic soup anyone? (NOAA Marine Debris)

Harder than finding a needle in a haystack: spotting "plastic soups" in the ocean?

A French team of researchers from the Ocean Scientific Logistic association (OSL) is setting sails to the Hawaiian Islands –more precisely to the "Seventh Continent," the name given to the huge cluster of plastic waste floating midwater of the North Pacific, over an area six times the size of France. Far from trade routes, nearly 3.5 million tons of plastic are floating there, in the first 30 meters below the water surface.

The goal of this expedition is to collect samples of water and waste to develop a new way of locating layers of plastic debris using satellites. Surprising as it seems, the ocean’s garbage patches are hard to locate –and are actually divided in at least five different zones around the globe.

"The ‘Seventh Continent’ is not strictly speaking an island we can walk on," says George Grepin, the OSL’s biologist. "It’s more like a soup made up of billions of plastic pieces the size of a confetti or even invisible to the naked eye. "Under the action of the sun and of currents, bottles, plastic bags and other containers lost at sea end up slowly decomposing to form particles as small as plankton, on which fish feed.

"With our partner, the National Center for Spatial Research (CNES), we hope to check whether, under certain conditions, satellites can spot these debris," says George Grépin.

Satellite lenses are not sharp enough to spot plastic micro-debris. "The best satellites, that is, the Pléiades satellites, are equipped with optical sensors that can take pictures of Earth with a resolution of about 70 centimeters," says CNES’s Danielle Staerke. "This is not enough to allow us to see debris that is usually 100 times smaller. Still, if these particles of waste are present in sufficient quantity, they are likely to modify the texture of the water. This effect should be visible on radar images and that’s what we are going to check."

The ocean’s plastic pollution has a particularly harmful impact on marine life, the most obvious being the risk of animals choking after ingesting floating debris, as well as the accumulation of toxic particles in the food chain.

But this vast "plastic soup" also has more surreptitious effects: the ocean progressively becomes a plastic heaven for a certain species of water striders --the Halobates sericeus-- that usually lay their eggs on rocks… or on floating objects. A study led by Miriam Goldste from San Diego’s Scripps Institution of Oceanography shows that the insect has taken advantage of the situation to proliferate. "We don’t know exactly what the consequences of this phenomenon are so far," Goldstein says. "But if it gets worse, there will be a risk of endangering the balance of marine ecosystems."

Read more from Le Temps in French. Full story by Caroline Depecker.

Photo – NOAA Marine Debris

*This is a digest item, not a direct translation

Sign up for our weekly Global Biz & Innovation newsletter now


Be a part of the conversation. Click to show comments
About this article source Website: http://www.letemps.ch/

Based in Geneva, Le Temps ("The Times") is one of Switzerland's top French-language dailies. It was founded in 1998 as a merger among various newspapers: Journal de Geneve, Gazette de Lausanne and Le Nouveau Quotidien.

Load More Stories

Unlimited access to exclusive journalism, the best world news source across all your devices

Subscribe Now Photo of Worldcrunch on different devices

Your premium access to Worldcrunch is provided by

University of Central Lancashire

Please register to begin


By registering you agree to our terms of service and privacy policy.