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Influence of Mesoscale Eddies on the Three-Dimensional Distribution of Microplastics in the Western North Pacific
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Scientists found that swirling ocean currents called eddies control where tiny plastic particles collect in the Pacific Ocean, with some areas concentrating plastics as deep as 600 meters underwater. This discovery helps us better understand how microplastics spread through the ocean and could improve predictions of where these pollutants end up in seafood and marine ecosystems. Understanding plastic distribution patterns is important because microplastics can work their way up the food chain and potentially affect human health through the fish we eat.
Despite growing concern over marine microplastic pollution, the mechanistic understanding of what governs their three-dimensional distribution in the ocean remains critically limited. Here, we characterize the three-dimensional distribution of seawater microplastics in the Western North Pacific Ocean. We find mesoscale eddies, including anticyclonic and cyclonic eddies, are directly related to the distribution and characteristics of seawater microplastics. Compared with cyclonic eddies, anticyclonic eddies tend to host higher microplastic abundance and diversity in the upper ocean, extending to at least 600 m depth. Sea level anomaly (SLA) seems to be the dominant driver of this phenomenon, as confirmed by redundancy analysis. Moreover, higher positive SLA values are associated with greater diversity in microplastic characteristics. Exceptions are observed at the surface and at 50 m depth, where complex hydrodynamic conditions occur. Overall, our study establishes a link between mesoscale eddies and the three-dimensional distribution of microplastics. This improves our understanding of the environmental behaviors of oceanic microplastics and offers scientific guidance for better assessing their environmental and ecological impacts.
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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.
Submesoscale eddies and their potential for buoyant microplastic accumulation
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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.
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 and vertical distribution within mesoscale ocean eddies south of the Canary Islands, investigating how these rotating current structures retain and redistribute microplastics through the water column.
Seafloor microplastic hotspots controlled by deep-sea circulation
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Researchers discovered that deep-sea ocean currents, not just vertical settling from the surface, play a major role in concentrating microplastics on the seafloor, creating pollution hotspots with the highest concentrations ever recorded in any seafloor setting. These thermohaline-driven bottom currents sort and accumulate microplastics in the same areas where they deliver oxygen and nutrients to deep-sea life. The findings suggest that the most biologically rich areas of the deep ocean floor are likely also the most contaminated with microplastics.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.