Tracking the origins of plastic debris across the Coral Sea: A case study from the Ouvéa Island, New Caledonia

Christophe Maes (1) , Bruno Blanke (1)

1 LPO - Laboratoire de physique des océans

Contamination of the marine environment by human-made plastic litter is a growing and global problem. Our study attempts to explain the presence of two plastic bottles beached on the Ouvéa Island, in the southwest Pacific Ocean, with trademarks from the Solomon Islands and Papua New Guinea (PNG). We simulate the oceanic drift tracks and associated transit times with a Lagrangian interpretation of the surface currents of a high-resolution ocean model. Our results show that it takes less than 2–3 months for drifting objects to connect these archipelagos (New Caledonia, Solomon Islands and PNG) and highlight the role of the meridional component of the circulation rather than the dominant zonal jets. This study shows that the origin or traceability of trash represent valuable information that can be used to test and, ultimately, improve our understanding of ocean circulation.

Mots clés: Plastic debris pollution; Southwestern Pacific; Coral Sea circulation; Lagrangian dispersion; Meridional drift pathways; Transfer times

Domaines: Océanographie

Christophe Maes, Bruno Blanke. Tracking the origins of plastic debris across the Coral Sea: A case study from the Ouvéa Island, New Caledonia. Marine Pollution Bulletin, 2015, 97 (1-2), pp.160-168. ⟨10.1016/j.marpolbul.2015.06.022⟩. ⟨hal-01575283⟩