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Modelling global river export of microplastics to the marine environment: Sources and future trends

机译:塑造Microplastics的全球河流导出到海洋环境:来源和未来趋势

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摘要

Microplastics, transported by rivers to oceans, are triggering environmental concern. This study aims to better understand river export of microplastics from land to sea. We developed the Global Riverine Export of Microplastics into Seas (GREMiS) model, a global, spatially explicit model for analysing the annual microplastics export to coastal seas. Our results indicate that riverine microplastics export varies among world regions, with several hotspots, e.g., South East Asia, and, depending on the 2050 scenario, may be doubled (Business as usual') or halved due to improved waste management (Environment profits'). Globally, our model simulations indicated fragmentation of macroplastics as the main source of microplastics, but this result heavily depends on the assumed fragmentation rate. Sewerage discharges contributed only 20%, ranging from 1% (Africa) to 60% (OECD countries) and decreasing by 2050 as a result of improved sanitation. We conclude that, combating microplastics in the aquatic environment requires more region-specific analyses. (C) 2019 Elsevier B.V. All rights reserved.
机译:河流运输到海洋的微型塑料,正在引发环境问题。本研究旨在更好地了解从陆地到海的河流出口微薄。我们开发了全球河流的微薄河流出口到海洋(Gremis)模型,全球性的空间显式模型,用于分析沿海地区的年度微薄的镜子出口。我们的结果表明,河流微塑料出口在世界地区各不相同,有几个热点,例如东南亚,以及根据2050场景,可能会加倍(往常的业务')或因废物管理改善而减半(环境利润' )。在全球范围内,我们的模型模拟表明宏观形成塑料的碎片作为微塑料的主要来源,但这种结果大大取决于假定的碎片率。由于改善的卫生,污水处理额仅贡献了20%,从1%(非洲)到60%(非洲)到60%(经合组织国家)和2050年下降。我们得出结论,在水生环境中调用微塑料,需要更多的区域特异性分析。 (c)2019 Elsevier B.v.保留所有权利。

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