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Submarine canyons as microplastic reservoirs: insight from a reduced complexity model
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Scientists found that underwater canyons along coastlines act like giant sponges, trapping up to 85% of tiny plastic particles that flow into them from polluted surface waters. This means these deep-sea environments are becoming major storage sites for microplastic pollution, which could seriously harm the sea creatures living there. Since many of these affected sea creatures end up in our food chain, this plastic buildup in ocean canyons could eventually impact human health through the seafood we eat.
It is assumed that the eventual sink of global microplastic pollution is the deep sea. The primary vector for sediment and particulate pollutants to the deep sea are gravity currents down canyons along the coastline and at the shelf edge, and it has become recognised that these trap and transport microplastics. In order to quantify the potential storage within these marine environments, we develop a reduced complexity model of the transport of microplastic within turbidity currents. We find that the relatively simple model can produce turbidity currents similar to that observed within the Whittard Canyon, offshore Ireland. Based on this model we map the fate of microplastic within the canyon. Under most scenarios, the model implies that small microplastics, fibres and fragments, will be transported into the canyon with little material leaving the canyon. Our best fitting model would suggest that only 15% of the source microplastic will bypass the canyon and be exported to the deep ocean floor. Marine canyons might therefore be a major sink of microplastic pollution, and act as a sponge between the anthropogenic source and the abyssal plane. This could have severe impacts on the ecosystems within these environments.
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Submarine canyons as microplastic reservoirs: Insight from a reduced complexity model
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Scientists modeled how underwater canyons act like giant funnels, trapping tiny plastic bits (microplastics) as they wash off coastlines instead of letting them spread across the deep ocean floor. Their findings suggest over 89% of this plastic pollution may get stuck in these canyons, turning them into hidden hotspots of contamination that could harm the sea creatures living there. Since these ecosystems are connected to the broader marine food web that eventually reaches our plates, understanding where microplastics accumulate helps researchers track potential long-term exposure risks for both ocean life and people.
Marine litter in submarine canyons: A systematic review and critical synthesis
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This systematic review finds that less than 1% of the world's submarine canyons have been studied for marine litter, revealing a major knowledge gap. Plastics that accumulate in deep-sea canyons break down into microplastics over time, potentially affecting marine food chains that humans depend on for nutrition.
The combined role of near-bed currents and sub-seafloor processes in the transport and pervasive burial of microplastics in submarine canyons
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Researchers studied how near-bed currents and sub-seafloor processes interact in submarine canyons to transport microplastics to deep-sea sediments, finding that canyon systems record temporal trends in plastic pollution but that physical disturbance can obscure or rework the depositional signal.
Sedimentary Characteristics of Microplastics Transported by Turbidity Currents in a Straight Canyon Topography
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Physical model experiments revealed that ocean turbidity currents — sediment-laden underwater flows — transport and deposit microplastics in predictable patterns within submarine canyons, with higher-concentration flows retaining more particles and depositing them preferentially in wave-shaped seafloor areas. This understanding helps predict where microplastics accumulate in the deep sea, which matters for assessing long-term ecological impacts in some of the ocean's most remote and poorly studied habitats.
The submarine Congo Canyon as a conduit for microplastics to the deep sea
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Researchers investigated the Congo Canyon submarine canyon as a potential conduit for transporting land-derived plastic waste to the deep sea. The canyon, which connects the Congo River to the deep Atlantic, may funnel significant amounts of microplastics from Central Africa's coast to the seafloor thousands of meters below. Understanding deep-sea plastic transport pathways is critical for assessing the full extent of ocean microplastic contamination.
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