Direct evidence that microplastics are transported to the deep sea by turbidity currents
Chen, Peng ORCID: https://orcid.org/0000-0001-7378-860X; Kane, Ian A.; Clare, Michael A.
ORCID: https://orcid.org/0000-0003-1448-3878; Soutter, Euan L.; Mienis, Furu; Wogelius, Roy A.; Keavney, Edward.
2025
Direct evidence that microplastics are transported to the deep sea by turbidity currents.
Environmental Science & Technology, 59 (14).
7278-7287.
10.1021/acs.est.4c12007
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© 2025 The Authors. Published by American Chemical Society chen-et-al-2025-direct-evidence-that-microplastics-are-transported-to-the-deep-sea-by-turbidity-currents.pdf - Published Version Available under License Creative Commons Attribution 4.0. Download (10MB) | Preview |
Abstract/Summary
Microplastics pervade the global seafloor, yet the mechanisms by which this pollutant is increasingly transported to the deep sea remain unclear. Fast-moving sediment avalanches (called turbidity currents) are hypothesized to efficiently transport microplastics into the deep sea. However, while this has been inferred from field sampling of the seafloor, it has never been demonstrated outside of a laboratory setting. Here, we provide direct field-scale evidence that turbidity currents in submarine canyons not only transport globally significant volumes of mineral and organic matter into the deep sea but also carry large quantities of anthropogenic particles, including microfibers and microplastic fragments. In situ hydrodynamic monitoring, coupled with direct sampling of the seafloor and material suspended by turbidity currents, reveals that even a submarine canyon whose head lies hundreds of kilometers from land acts as an efficient conduit to flush sediment and pollutants from the continental shelf to water depths greater than 3200 m. Frequent and fast turbidity currents supply oxygen and nutrients that sustain deep-sea biodiversity and fishing grounds in, and adjacent to, such canyons. Our study therefore confirms that these biodiversity hotspots are colocated with microplastic hotspots, indicating that the more than 5000 land-detached canyons worldwide can be important but previously unproven conveyors of anthropogenic pollution to the deep sea.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1021/acs.est.4c12007 |
ISSN: | 0013-936X |
Additional Keywords: | microplastic transport, turbidity current, ocean sediment, deep-sea monitoring, submarine canyon |
Date made live: | 28 Apr 2025 15:14 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/539347 |
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