Microplastic accumulation in deep-sea sediments from the Rockall Trough

Microplastics are widely dispersed through the marine environment. Few studies have assessed the long-term or historic prevalence of microplastics, yet acquiring such data can inform their distribution, transport and the environmental risks posed. To quantify the distribution and polymer types tempo...

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Bibliographic Details
Published in:Marine pollution bulletin 2020-05, Vol.154, p.111092, Article 111092
Main Authors: Courtene-Jones, Winnie, Quinn, Brian, Ewins, Ciaran, Gary, Stefan F., Narayanaswamy, Bhavani E.
Format: Article
Language:English
Subjects:
Chronology
Cores
Data acquisition
Deep sea
Deep water
Distribution
Environmental risk
Lead isotopes
Marine environment
Microplastic
Microplastics
Plastic
Pollution
Polymers
Porosity
Sediment record
Sediments
Transport
Water depth
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Summary:Microplastics are widely dispersed through the marine environment. Few studies have assessed the long-term or historic prevalence of microplastics, yet acquiring such data can inform their distribution, transport and the environmental risks posed. To quantify the distribution and polymer types temporally, sediment cores were collected from >2000 m water depth in the Rockall Trough, North Atlantic Ocean. As hypothesized, a significant negative trend was observed in the frequency of microplastics with increasing sediment age, however there was an increase in polymer diversity. Microplastics were pervasive throughout the sediment analysed (10 cm depth), yet lead-210 (210Pb) activities were confined to the upper 4 cm, indicating this layer to be ~150 years old and thus the presence of microplastics far exceed the production of modern plastic. A number of mechanisms, including sediment reworking, could redistribute microplastics vertically. Additionally, microplastics abundance was significantly correlated with sediment porosity, suggesting interstitial transport via pore waters. [Display omitted] •A negative trend was identified between microplastics (MPs) abundance and increasing sediment chronology•MPs were present throughout the sediment depth studied (10cm), which far exceeded the age of plastic production•Polymer diversity was observed to increase through the core depth•Pore water is a potential distribution pathway, as indicated by the positive correlation between MPs and sediment porosity
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2020.111092