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A threshold model of plastic waste fragmentation: New insights into the distribution of microplastics in the ocean and its evolution over time
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Researchers proposed a new model for how plastic waste breaks down in the ocean, suggesting there is a critical size below which particles resist further fragmentation. The model predicts a peak in microplastic abundance around 1 millimeter in size, which matches real-world observations and helps explain the puzzling distribution patterns of ocean plastic pollution.
Plastic pollution in the aquatic environment has been assessed for many years by ocean waste collection expeditions around the globe or by river sampling. While the total amount of plastic produced worldwide is well documented, the amount of plastic found in the ocean, the distribution of particles on its surface and its evolution over time are still the subject of much debate. In this article, we propose a general fragmentation model, postulating the existence of a critical size below which particle fragmentation becomes extremely unlikely. In the frame of this model, an abundance peak appears for sizes around 1 mm, in agreement with real environmental data. Using, in addition, a realistic exponential waste feed to the ocean, we discuss the relative impact of fragmentation and feed rates, and the temporal evolution of microplastics (MP) distribution. New conclusions on the temporal trend of MP pollution are drawn.
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Researchers developed a fragmentation model for plastic particles in the ocean that postulates a critical size threshold below which further fragmentation becomes extremely unlikely, producing a predicted abundance peak around 1 mm in agreement with field data. The model incorporates realistic environmental input rates and degradation kinetics to project the evolution of microplastic particle size distributions over time.
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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.