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The pervasiveness of microplastics in global oceans is raising concern aboutits impacts on organisms. While quantifying its toxicity is still an openissue, sampling evidence has shown that rarely is marine microplastics foundclean; rather, it is often contaminated by other types of chemical pollutants,some known to be harmful to biota and humans. To provide a first tool forassessing the role of microplastics as vectors of plastic-related organicpollutants (PROPs), we developed a data-informed model that accounts for theintertwined dynamics of Lagrangian microplastic particles transported bysurface currents and the Eulerian advection-diffusion of chemicals thatpartition on them through seawater-particle interaction. Focusing on theMediterranean Sea and using simple, yet realistic forcings for the input ofPROPs, our simulations highlight that microplastics can mediate PROP exportacross different sub-seas. Particle origin, in terms of both source type(either coastal, riverine, or fishing-derived) and geographical location, seemsto play a major role in determining the amount of PROPs conveyed bymicroplastics during their journey at sea. We argue that quantitative numericalmodelling approaches can be focal to shed some light on the vast spatial andtemporal scales of microplastics-PROPs interaction, complementary tomuch-needed on-field investigation.

A coupled model for the linked dynamics of marine pollution by microplastics and plastic-related organic pollutants