Abstract
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.
DOI
10.1016/j.marpolbul.2020.111092
Publication Date
2020-05-01
Publication Title
Marine Pollution Bulletin
Volume
154
ISSN
0025-326X
Embargo Period
2023-08-16
Organisational Unit
School of Biological and Marine Sciences
Recommended Citation
Courtene-Jones, W., Quinn, B., Ewins, C., Gary, S., & Narayanaswamy, B. (2020) 'Microplastic accumulation in deep-sea sediments from the Rockall Trough', Marine Pollution Bulletin, 154. Available at: https://doi.org/10.1016/j.marpolbul.2020.111092
