As an emerging marine environmental issue, marine plastic debris pollution has attracted worldwide attention. Studies have covered more and more areas of the world's oceans. To further understand the sources and variation of marine plastic debris in the surface water of the Bohai Sea, in this study, plastic debris was collected during the four seasons of 2016–2017. The results showed the mean density of plastic debris over these seasons was 0.49 ± 0.18 particles/m³. Macro-, meso-, and micro- plastics accounted for 5%, 26%, and 69% of the total number of plastic debris, respectively. The density of the microplastics was 0.35 ± 0.13 particles/m³. The highest density was found in spring, followed by summer and winter, and the lowest in autumn. High distribution densities were observed in the Liaodong Bay and the Bohai Strait, which were attributed to the dynamics of the rim current, terrain, and fishery activities.

Capsule abstract

Riverine input, dynamics of the rim current, terrain, and fishery activities contribute to the variations in marine plastic debris in the surface water of the Bohai Sea.

中文翻译：

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渤海表层水中塑料和微塑料碎片的时空分布

作为一个新兴的海洋环境问题，海洋塑料碎片污染已引起全球关注。研究涵盖了世界上越来越多的海洋地区。为了进一步了解渤海地表水中海洋塑料碎片的来源和变化，在这项研究中，在2016-2017年的四个季节中收集了塑料碎片。结果表明，这些季节中塑料碎片的平均密度为0.49±0.18颗粒/ m ³。大塑料，中塑料和微塑料分别占塑料碎片总数的5％，26％和69％。微塑料的密度为0.35±0.13颗粒/ m ³。密度最高的是春季，其次是夏季和冬季，最低的是秋天。在辽东湾和渤海海峡发现了高分布密度，这归因于边缘海流，地形和渔业活动的动态。

胶囊摘要

河流输入，边缘水流的动态，地形和渔业活动导致了渤海地表水中海洋塑料碎片的变化。