BAUDENA, Alberto; KIKO, Rainer; JALON ROJAS, Isabel; PEDROTTI, Maria Luiza

doi:10.1021/acs.est.2c08873

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BAUDENA, Alberto
Laboratoire d'océanographie de Villefranche [LOV]

KIKO, Rainer
Laboratoire d'océanographie de Villefranche [LOV]

JALON ROJAS, Isabel

Environnements et Paléoenvironnements OCéaniques [EPOC]
University of New South Wales [Canberra Campus] [UNSW]

Langue

Article de revue

Ce document a été publié dans

Environmental Science and Technology. 2023-05-01

Résumé en anglais

Plastic is a widespread marine pollutant, with most studies focusing on the distribution of floating plastic debris at the sea surface. Recent evidence, however, indicates a significant presence of such low density plastic in the water column and at the seafloor, but information on its origin and dispersion is lacking. Here, we studied the pathways and fate of sinking plastic debris in the Mediterranean Sea, one of the most polluted world seas. We used a recent Lagrangian plastic-tracking model, forced with realistic parameters, including a maximum estimated sinking speed of 7.8 m/d. Our simulations showed that the locations where particles left the surface differed significantly from those where they reached the seafloor, with lateral transport distances between 119 and 282 km. Furthermore, 60% of particles deposited on the bottom coastal strip (20 km wide) were released from vessels, 20% from the facing country, and 20% from other countries. Theoretical considerations furthermore suggested that biological activities potentially responsible for the sinking of low density plastic occur throughout the water column. Our findings indicate that the responsibility for seafloor plastic pollution is shared among Mediterranean countries, with potential impact on pelagic and benthic biota.< Réduire

Mots clés en anglais

low-density plastic

marine pollution

water column

seafloor

transport

sinking speed

microplastic

URI

https://oskar-bordeaux.fr/handle/20.500.12278/188108

DOI

http://dx.doi.org/10.1021/acs.est.2c08873

Project ANR

Tropical Atlantic Deoxygenation: gateway dynamics, feedback mechanisms and ecosystem impacts - ANR-19-MPGA-0012

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805