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Article Dans Une Revue Marine Pollution Bulletin Année : 2023

Influence of waves on the three-dimensional distribution of plastic in the ocean

Résumé

The world's oceans are facing plastic pollution, 80% of which of terrestrial origin flowing from the mismanaged waste of coastal populations and from river discharge. To study the fate of this pollution, the three-dimensional trajectories of neutral plastic particles continuously released for 24 years according to realistic source scenarios are computed using currents from a global oceanwave coupled model at ¼°resolution and from a reference ocean-only model. These Lagrangian simulations show that neutral particles accumulate at the surface in the subtropical convergence zones from where they penetrate to about 250m depth and strongly disperse over 40°of latitude. About 5.3% of the particles remain at the surface with the wave-coupled model currents, whereas only 2% for the uncoupled model, with some modulation in the location of the convergence zones. Increased surface retention results from upward vertical velocities induced by widespread divergence of waves-induced Stokes transport in the surface layers.
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Dates et versions

hal-04234369 , version 1 (10-10-2023)

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Raphaël Bajon, Thierry Huck, Nicolas Grima, Christophe Maes, Bruno Blanke, et al.. Influence of waves on the three-dimensional distribution of plastic in the ocean. Marine Pollution Bulletin, 2023, 187, pp.114533. ⟨10.1016/j.marpolbul.2022.114533⟩. ⟨hal-04234369⟩
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