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Coherent eddies redistribute microplastics across the water column
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Scientists studying swirling ocean currents called eddies near the Canary Islands found that these massive rotating water masses can trap up to three times more microplastic pieces than surrounding waters, pulling plastic bits down as deep as 1,200 meters (nearly 4,000 feet). This matters because it shows the ocean's interior, not just the surface, is a major hidden storage zone for plastic pollution, meaning the seafood and marine ecosystems we depend on may be exposed to more microplastics than previously realized, even far below where we can see them.
The ocean interior is emerging as a hidden reservoir of microplastics, yet the mechanisms governing their accumulation below the surface remain poorly understood. Despite growing interest in microplastic distribution throughout the ocean, in-situ observations within smaller-scale oceanographic features such as mesoscale eddies and fronts remain sparse. Here we present in-situ observations of microplastic distributions from 50 to 1200 m within two coherent mesoscale eddies south of the Canary Islands, an anticyclone and a cyclone. Combining physical oceanographic measurements and microplastic sampling with Lagrangian Coherent Structure (LCS) analyses, we show that both eddies enhanced microplastic concentrations in the upper 200 m by up to threefold relative to regional background waters. Small fragments (< 200 μm) dominated microplastic abundances, while fibers were significantly more abundant in the cyclone and larger fragments prevailed in the anticyclonic eddy. These findings reinforce that coherent eddies act as dynamic drivers of microplastic redistribution in the Atlantic Ocean, emphasizing the role of particle-specific inertial dynamics in shaping the fate of plastics throughout the water column.
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This study investigates how small ocean eddies called submesoscale eddies can trap and concentrate buoyant microplastics below the water surface, not just at the top. Using both physical oceanographic measurements and laboratory experiments, researchers found that these rotating water masses create subsurface attractors that pull floating particles downward. This matters because it helps explain why microplastics are found throughout the water column rather than only at the surface, complicating efforts to clean up or track ocean plastic pollution.
Assessing the microplastic retention and distribution in the water column in mesoscale eddies south of the Canary Islands
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Researchers conducted the first in situ observations of microplastic concentrations within mesoscale eddies south of the Canary Islands, finding that these oceanographic structures influence the vertical distribution and retention of microplastics in the water column. The study provides new evidence that mesoscale eddies act as accumulation zones, affecting how microplastics are transported and redistributed in the open ocean.
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