Tuesday, July 23, 2024

Microplastics On The Seafloor Have Tripled In The Past 20 Years


The total amount of microplastics deposited on the bottom of the oceans has tripled in the past two decades, scientists have determined.

The progression corresponds to the type and volume of consumption of plastic products by society, according to a study developed by the Institute of Environmental Science and Technology of the Universitat Autònoma de Barcelona (ICTA-UAB) and the Department of the Built Environment of Aalborg University (AAU-BUILD), which provides the first high-resolution reconstruction of microplastic pollution from sediments obtained in the northwestern Mediterranean Sea.

Despite the seafloor being considered the final sink for microplastics floating on the sea surface, the historical evolution of this pollution source in the sediment compartment, and particularly the sequestration and burial rate of smaller microplastics on the ocean floor, is unknown.

Microplastics deposited on the seafloor triple in 20 years (Image credit: Lena Heins)
Researcher Laura Simon-Sánchez during one of the sample collection campaigns. (Image credit: Lena Heins)

This new study, published in the journal Environmental Science and Technology, shows that microplastics are retained unaltered in marine sediments, and that the microplastic mass sequestered in the seafloor mimics the global plastic production from 1965 to 2016.

As ICTA-UAB researcher Laura Simon-Sanchez explains:

“Specifically, the results show that, since 2000, the amount of plastic particles deposited on the seafloor has tripled and that, far from decreasing, the accumulation has not stopped growing mimicking the production and global use of these materials.”

Check out the study here.

John Liang
John Lianghttps://www.deeperblue.com/
John Liang is the News Editor at DeeperBlue.com. He first got the diving bug while in High School in Cairo, Egypt, where he earned his PADI Open Water Diver certification in the Red Sea off the Sinai Peninsula. Since then, John has dived in a volcanic lake in Guatemala, among white-tipped sharks off the Pacific Coast of Costa Rica, and other places including a pool in Las Vegas helping to break the world record for the largest underwater press conference.