Fig. 3: Crossroadness and plastic crossroads.
a Crossroadness field calculated from simulated particle trajectories (N ≃ 1.472 × 108) between 2013 and 2017. White and black circles, with radius equal to σ, show the twenty most important plastic crossroads, together with their ranking. b, c Focus on the western Mediterranean basin in the region surrounding the sixth-ranked crossroad (white circle), located north of Mallorca. Trajectories of some of the particles passing through this crossroad are shown by the solid lines: (b) particles directly released at sea by vessels at the green dots; (c) particles originating from three cities: Barcelona (gray lines); Valencia (white); and Algiers (brown).
