A deposition baseline for microplastic particle distribution in an estuary

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Authors

Matthew L. H. Cheng, Thomas C Lippmann, Jennifer Dijkstra, Gabriela Bradt, Salme Cook, Jang-Geun CHoi, Bonnie L Brown 

Abstract

Microplastics (MP) known to be ubiquitous in the plastisphere, have yet to be quantified within Great Bay Estuary (GBE) in the Gulf of Maine region of North America. We extracted and analyzed MP in archived sediment cores obtained from representative transects across GBE. Results indicated that MP are distributed in GBE sediments, 0-30 cm, at an average occurrence of 100±50 particles g-1 and that morphology varies by site and depth. Analysis by sediment depth and age class indicated that MP deposition 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 MP properties and that the highest deposition likely occurs in regions with weaker hydrodynamic flows and lower bed shear stress e.g., eelgrass meadows and along the fringes of the Bay. These results provide a baseline and predictive understanding of the occurrence, morphology, and sedimentation of MP in the estuary.

DOI

https://doi.org/10.31223/X5VG7N

Subjects

Life Sciences, Physical Sciences and Mathematics

Keywords

microplastics, sedimentation, Great Bay Estuary

Dates

Published: 2021-02-18 07:47

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
we are working through how to share the data - they consist of programs, distributions, and excel files of particle properties and are housed in several different locations at present

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