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Three-dimensional Basin-scale Oceanic Transport of River-derived Microplastics in the South China Sea
Original title: Three-dimensional Basin-scale Oceanic Transport of River-derived Microplastics in the South China Sea
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This Japanese-language oceanography study used high-resolution 3D ocean circulation reanalysis data to track river-derived microplastic particles in the South China Sea using Lagrangian neutral particle simulations. Researchers found that most river-origin particles remained in the South China Sea for extended periods, with strong monsoon-driven seasonal variability in dispersion patterns and evidence of particles descending the continental shelf slope to potentially contaminate deep sea environments. The study provides important insights into basin-scale microplastic transport dynamics in a semi-enclosed tropical sea.
重要な地球環境問題の一つである海洋マイクロプラスチック汚染の実態解明に向けて，南シナ海を対象とした高解像度3次元海洋流動再解析値を用いて大河川から供給されるマイクロプラスチック粒子を模したLagrange中立粒子の3次元追跡実験を行った．粒子の移流分散特性とその形成機構を検討し，河川起源粒子の大半は南シナ海に長期間残留すること，分散パターンにはモンスーンに伴う季節差が大きいこと，エクマン輸送による沿岸沈降の影響を受けて大陸縁辺部の陸棚斜面を下降して深海汚染が顕在化している可能性などの幾つかの重要な知見を得た．
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