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Plastics in the deep sea – A global estimate of the ocean floor reservoir
Zhu, X.; Rochman, C.M.; Hardesty, B.D.; Wilcox, C. (2024). Plastics in the deep sea – A global estimate of the ocean floor reservoir. Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 206: 104266. https://dx.doi.org/10.1016/j.dsr.2024.104266
In: Deep-Sea Research, Part I. Oceanographic Research Papers. Elsevier: Oxford. ISSN 0967-0637; e-ISSN 1879-0119
|  |
| Trefwoorden |
Ocean floor
Reservoirs
Marien/Kust |
| Author keywords |
Plastic pollution; Global plastic cycle; Environmental contaminants |
| Auteurs | | Top |
- Zhu, X.
- Rochman, C.M.
- Hardesty, B.D.
- Wilcox, C.
|
|
|
| Abstract |
The exponential increase in plastic production coupled with variable global waste management system efficiencies has resulted in large amounts of plastic waste entering the ocean every year. Although we know millions of tonnes of plastic have entered the oceans, we do not yet understand the patterns of its accumulation across space nor the drivers of these patterns. The deep ocean is expected to be a resting place, or reservoir, for most plastic pollution. Here, we conducted a rigorous, systematic review of previously published datasets to synthesize our understanding of macroplastic pollution (>5 mm) on the ocean floor. Using extracted data, we built predictive additive models to estimate the amount and distribution of plastic on the ocean floor. We built two models: one using data from remote operated vehicles (ROVs) and another using data from bottom trawls. Using the model built with ROV data, which was better-constrained, we estimate that 3 to 11 million metric tonnes (MMT) of plastic pollution resides on the ocean floor as of 2020. This is of similar magnitude to annual inputs from land and one to two orders of magnitude greater than what is predicted to be floating on the ocean surface. To improve future estimates and our understanding of global patterns, we provide recommendations for ocean floor monitoring of plastic pollution. |
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