14 million tonnes of microplastics on sea floor: Australian study

14 million tonnes of microplastics on sea floor: Australian study
A volunteer of the NGO 'Canarias Libre de Plasticos' (Canary Islands free of plastics) carries out a collection of microplastics and mesoplastic debris to clean the Almaciga Beach, on the north coast of the Canary Island of Tenerife, on July 14, 2018.

The world's sea floor is littered with an estimated 14 million tonnes of microplastics, broken down from the masses of rubbish entering the oceans every year, according to Australia's national science agency.

The quantity of the tiny pollutants was 25 times greater than previous localised studies had shown, the agency said, calling it the first global estimate of sea-floor microplastics.

Researchers at the agency, known as CSIRO, used a robotic submarine to collect samples from sites up to 3,000 metres (9,850 feet) deep, off the South Australian coast.

"Our research found that the is a sink for microplastics," principal research scientist Denise Hardesty said.

"We were surprised to observe high microplastic loads in such a remote location."

The scientists, who published their findings in peer-reviewed journal Frontiers in Marine Science, said areas with more floating rubbish generally had more microplastic fragments on the .

"Plastic pollution that ends up in the ocean deteriorates and breaks down, ending up as microplastics," study lead Justine Barrett said.

"The results show microplastics are indeed sinking to the ocean floor."

Ocean of trouble
Graphic outlining the environmental degredation of the oceans caused by human activity.

Hardesty called for urgent action to find solutions to marine , which affects ecosystems, wildlife and human health.

"Government, industry and the community need to work together to significantly reduce the amount of litter we see along our beaches and in our oceans," she said.


Explore further

We estimate there are up to 14 million tonnes of microplastics on the seafloor. It's worse than we thought

More information: Justine Barrett et al. Microplastic Pollution in Deep-Sea Sediments From the Great Australian Bight, Frontiers in Marine Science (2020). DOI: 10.3389/fmars.2020.576170

© 2020 AFP

Citation: 14 million tonnes of microplastics on sea floor: Australian study (2020, October 7) retrieved 26 October 2020 from https://phys.org/news/2020-10-million-tonnes-microplastics-sea-floor.html
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