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Oceanic realistic application of a microplastic biofouling model to the river discharge case
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Researchers applied a biofouling model to simulate how microbial colonization affects microplastic transport from river discharge into oceanic environments, finding that biofouling alters particle density and significantly changes vertical distribution and transport distances.
Marine biofouling is considered one of the major biophysical processes influencing the vertical dynamics of plastic debris in seawater. We numerically implement, for the first time, this mechanism within a fine-resolution, regional model of the Tyrrhenian Sea, in order to simulate the dispersion of microplastics (MPs) released at the mouth of a highly polluting river. Four polymers and three particle sizes are used to quantify algal concentration influence on the trajectories, fates, and accumulation spots of the tracked MPs, by comparing 2002 winter and summer runs encompassing or not biofouling. Besides a marked seasonality for most of the MP types and radii tested, biofouling effects are prominently observed for only 2 polymers and particles bigger than 1μm. Thus, further realistic applications of the biofouling mechanism in oceanic circulation models are required to achieve a thorough assessment of its impact on plastic density within distinctive basins of the world seas.
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Researchers developed a modeling study to quantify how biofouling -- the attachment of microorganisms to microplastic surfaces -- affects microplastic transport in river systems by altering particle size, shape, density, and settling velocity, using quantified data to simulate transport dynamics.
Quantifying the impact of biofouling on microplastic transport: a modeling study
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Researchers modelled the impact of biofouling on microplastic transport in fluvial environments by simulating scenarios in which biofilm accumulation altered particle buoyancy, size, shape, density, and settling velocity. Using probability density functions to capture variability in biofilm thickness, suspended solids, and turbulence, the study quantified how biofouling dynamics shift microplastic transport behaviour.
Ups and Downs in the Ocean: Effects of Biofouling on Vertical Transport of Microplastics
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Researchers developed the first theoretical model to simulate how biofouling, the growth of microbial biofilms on plastic surfaces, affects the vertical movement of microplastics in the ocean. The model predicts that depending on particle size and density, fouled microplastics may float, sink to the seafloor, or oscillate at intermediate depths. These findings help explain why small microplastics seem to disappear from the ocean surface and suggest they may concentrate at mid-water depths where vulnerable species live.
Toward Optimizing Microplastic Transport Models through Biofouling Experiments
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Researchers conducted biofouling experiments to improve the accuracy of microplastic transport models, examining how biological colonization of plastic surfaces alters buoyancy and sinking rates at a rate measured per week, providing empirical data to refine predictions of where MPs ultimately accumulate in aquatic environments.
Plastic litter in the ocean: Modeling of the vertical transport of micro plastics in the ocean
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This thesis modeled the vertical transport of microplastics in the ocean, incorporating physical properties such as particle density, size, and biofouling into a transport model to better predict where plastic particles accumulate at depth. The work addresses a key gap in understanding the full three-dimensional distribution of ocean 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.