Arctic Ocean sediments as important current and future sinks for marine microplastics missing in the global microplastic budget

To better understand unexpectedly low plastic loads at the ocean’s surface compared with inputs, unidentified sinks must be located. Here, we present the microplastic (MP) budget for multi-compartments in the western Arctic Ocean (WAO) and demonstrate that Arctic sediments serve as important current...

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Bibliographic Details
Published in:Science Advances
Main Authors: Kim, Seung-Kyu, Kim, Ji-Su, Kim, So-Young, Song, Nan-Seon, La, Hyoung Sul, Yang, Eun Jin
Format: Text
Language:English
Published: American Association for the Advancement of Science 2023
Subjects:
Earth
Environmental
Ecological
and Space Sciences
Arctic
Arctic Ocean
Sea ice
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10321750/
https://doi.org/10.1126/sciadv.add2348
Description
Summary:To better understand unexpectedly low plastic loads at the ocean’s surface compared with inputs, unidentified sinks must be located. Here, we present the microplastic (MP) budget for multi-compartments in the western Arctic Ocean (WAO) and demonstrate that Arctic sediments serve as important current and future sinks for MPs missing from the global budget. We identified an increase of 3% year(−1) in MP deposition from sediment core observations. Relatively elevated MP abundances were found in seawater and surface sediments around the summer sea ice retreat region, implying enhanced MP accumulation and deposition facilitated by the ice barrier. We estimate 15.7 ± 2.30 × 10(16) N and 0.21 ± 0.14 MT as total MP loads in the WAO with 90% (by mass) buried in the post-1930 sediments, which exceeds the global average of the current marine MP load. The slower increase in plastic burial versus production implies a lag in plastic delivery to the Arctic, indicating more pollution in the future.

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