黑潮扩展区南部再循环中的冷核环对微塑料的聚集和迁移:中尺度漩涡对塑料碎片分布的作用

IF 2.2 3区 地球科学 Q2 OCEANOGRAPHY
Ryota Nakajima, Akira Nagano, Satoshi Osafune, Masashi Tsuchiya, Katsunori Fujikura
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引用次数: 0

摘要

中尺度漩涡--空间尺度为数十到数百公里、时间尺度为数月到数年的海洋漩涡--是海洋中能量最大的流动形式之一,可能是漂浮微塑料的重要运输工具。然而,迄今为止,船上观测尚未明确中尺度漩涡中微塑料的丰度和迁移情况。我们在日本东南部黑潮延伸再循环涡旋(KERG)中的一个具有较大海面高度凹陷(约 0.8 米)的强烈气旋中尺度漩涡(即所谓的冷核环)中进行了漂浮微塑料调查。漩涡内的微塑料浓度(460×104 个/平方公里)比邻近海域高出一到两个数量级,这可能是由于微塑料丰富的黑潮扩展区(KE)在脱离时获得了微塑料,以及漩涡水平夹带了微粒。我们使用同化产品进行的研究表明,当漩涡在 KERG 中顺时针方向移动时,被漩涡捕获的大多数微粒在几个月内都没有离开。这些结果表明,中尺度漩涡对海洋表面微塑料的迁移和再分布具有重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Aggregation and transport of microplastics by a cold-core ring in the southern recirculation of the Kuroshio Extension: the role of mesoscale eddies on plastic debris distribution

Aggregation and transport of microplastics by a cold-core ring in the southern recirculation of the Kuroshio Extension: the role of mesoscale eddies on plastic debris distribution

Mesoscale eddies – ocean vortices with spatial scales of tens to hundreds of kilometers and time scales of months to years – are among the most energetic forms of flow in the ocean, and may act as significant transporters of floating microplastics. Yet, shipboard observation has thus far not clarified the abundance and transport of microplastics in mesoscale eddies. We conducted floating microplastic surveys in an intense cyclonic mesoscale eddy with a large sea surface height depression (approximately 0.8 m), a so-called cold-core ring, in the Kuroshio Extension recirculation gyre (KERG) southeast of Japan. The concentration of microplastics within the eddy (460 × 104 pieces/km2) was one or two orders of magnitude higher than in the adjacent oceanic waters, likely due to the acquisition of microplastics from the microplastic-rich Kuroshio Extension (KE) when detaching, as well as the horizontal entrainment of particles by the eddy. Our examination by using an assimilation product showed that most particles captured by the eddy remained within for several months while the eddy moved clockwise in the KERG. These results suggest that mesoscale eddies are of importance in the transportation and redistribution of microplastics on the ocean surface.

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来源期刊
Ocean Dynamics
Ocean Dynamics 地学-海洋学
CiteScore
5.40
自引率
0.00%
发文量
37
审稿时长
6-12 weeks
期刊介绍: Ocean Dynamics is an international journal that aims to publish high-quality peer-reviewed articles in the following areas of research: Theoretical oceanography (new theoretical concepts that further system understanding with a strong view to applicability for operational or monitoring purposes); Computational oceanography (all aspects of ocean modeling and data analysis); Observational oceanography (new techniques or systematic approaches in measuring oceanic variables, including all aspects of monitoring the state of the ocean); Articles with an interdisciplinary character that encompass research in the fields of biological, chemical and physical oceanography are especially encouraged.
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