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Fluctuations in the Microplastic Vertical Distribution Due to Tide in the Tidal Reach of the Oita River
Summary
Researchers monitored microplastic vertical distribution through a full tidal cycle in the tidal reach of the Oita River, Japan, finding that concentrations were highest in bottom layers regardless of tidal phase, with accumulation at a saltwater intrusion layer, and that rising tide conditions produced the highest vertically-averaged concentrations.
本研究では，大分川感潮域でマイクロプラスチック（MP）の調査をすることで，一潮汐（干潮A-上げ潮-満潮-下げ潮-干潮Bの順）におけるMPの鉛直分布の時間変動を明らかにした．潮位に依らず，底層に多くのMPが存在し，表層から底層にかけてMP質量濃度が高かったが，中間層に存在する塩水躍層でのMP集積が確認された．また，一潮汐におけるMP鉛直平均濃度を比較した結果，上げ潮＞下げ潮＞干潮A＞満潮＞干潮Bの順に小さくなった．これから潮流の緩やかな干潮・満潮時にMPが沈降し，潮流の速い上げ潮・下げ潮時に堆積したMPが巻き上げられる動態が推察された．また，1mm未満のMP（SMP）が，1mm以上のMP（LMP）よりも1桁-2桁大きく，海洋への流出負荷を評価する上でSMPの濃度評価が軽視できないことが示唆された．
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