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Long-range transport of oil by marine plastic debris: Evidence from an 8,500 km journey
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This study used physical oceanographic modeling and molecular forensics to demonstrate that oil from Brazil's 2019 mystery spill traveled approximately 8,500 km in 240 days to reach Palm Beach, Florida, carried by marine plastic debris. The findings demonstrate an additive contaminant effect where plastic pollution enables unprecedented long-range transequatorial transport of oil pollution.
Weathering processes typically restrict the distance spilled oil travels in the ocean to a few hundred kilometers. Leveraging oiled marine debris as “drifters of opportunity”, we tested the hypothesis of the unprecedented long-range (thousands of kilometers) transequatorial transport of oil adhered to marine debris by surface currents. Physical oceanographic modeling provided the plausibility for this hypothesis, and molecular forensics provided the definitive evidence supporting it. Oil carried by marine debris arriving at Palm Beach, Florida in 2020 matched oil from the 2019 Brazil mystery oil spill, having traveled ~8,500 km in ~240 days. We demonstrate an additive contaminant effect whereby plastic pollution facilitates the long-range transport of oil pollution. These findings underscore that regional inputs into the global ocean can have transboundary impacts.
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Researchers developed computational models to simulate how microplastics and associated chemical pollutants move together through the ocean, accounting for both physical transport and the uptake and release of organic chemicals on plastic surfaces. The models showed that microplastics can act as long-distance carriers for sorbed pollutants, delivering them to marine ecosystems far from their sources. Data-informed modeling of coupled microplastic-chemical transport is important for understanding the full scope of the ecological risk posed by ocean plastic pollution.
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An ocean circulation model incorporating biological and physical processes found that near-surface currents, including wind-driven surface drift and wave-induced mixing, play a major role in dispersing buoyant microplastics globally, with plastic accumulating preferentially in subtropical convergence zones. The model improves understanding of how ocean physics shapes global microplastic distribution patterns.
Oceanic Long-Range Transport of Organic Additives Present in Plastic Products – An overview
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This review examined the oceanic long-range transport of chemical additives leaching from marine plastic debris, finding that persistent synthetic polymer matrices release significant quantities of additives — including plasticizers, flame retardants, and antioxidants — that can travel globally via ocean currents.
Mixing of passive tracers at the ocean surface and its implications for plastic transport modelling
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Researchers modeled the mixing and transport of passive tracers — including plastic debris — at the ocean surface, finding that current-driven mixing creates complex spreading patterns that affect where floating plastics accumulate. The findings have implications for predicting the distribution of microplastic pollution across ocean basins.
Pathways of marine debris derived from trajectories of Lagrangian drifters
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Researchers applied a probabilistic model to global satellite-tracked ocean drifter trajectories to map marine debris pathways, identifying five subtropical convergence zones maintained by Ekman currents where floating debris — including microplastics — preferentially accumulates, confirming predictions with direct ocean surface measurements.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.