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A baseline for microplastic particle occurrence and distribution in Great Bay Estuary
Summary
Researchers extracted and analyzed microplastics from archived sediment cores from Great Bay Estuary in the Gulf of Maine, finding an average of 116 particles per gram of sediment across depths of 0-30 cm. Historical data suggested microplastic accumulation increased over several decades but may have recently begun to level off.
We extracted and analyzed microplastics (MP) in archived sediment cores from Great Bay Estuary (GBE) in the Gulf of Maine region of North America. Results indicated that MP are distributed in GBE sediments, 0–30 cm, at an average occurrence of 116 ± 21 particles g−1 and that morphology varies by site and depth. Analysis by sediment depth and age class indicated that MP accumulation increased over several decades but recently (5–10 years) has likely begun to decrease. Hydrodynamic and particle transport modeling indicated that bed characteristics are a more controlling factor in MP distribution than typical MP properties and that the highest accumulation likely occurs in regions with weaker hydrodynamic flows and lower bed shear stress, e.g., eelgrass meadows and along fringes of the Bay. These results provide a baseline and predictive understanding of the occurrence, morphology, and sedimentation of MP in the estuary.