Microplastics in sea ice drifted to the Shiretoko Peninsula, the southern end of the Sea of Okhotsk

Researchers have uncovered significant insights into the presence and distribution of microplastics (MPs) within sea ice, highlighting its role as both a temporary sink and carrier for these pollutants. The study analyzed four sea-ice cores from the Shiretoko Peninsula, revealing nine types of MPs, predominantly fragmentary in shape and smaller than 120 μm, with fiber MPs exceeding 210 μm. MP concentrations ranged from 0 to 60 particles per liter, averaging 21 particles/L, with higher occurrences noted in lower ice layers, suggesting potential sources or redistribution within the ice matrix. Notably, no correlation was found between MP and sediment abundances, indicating distinct suspension freezing kinetics for these substances. These findings provide critical evidence for understanding the dynamics of microplastics in sea ice ecosystems.

Ohno, H., & Iizuka, Y. (2024). Microplastics in sea ice drifted to the Shiretoko Peninsula, the southern end of the Sea of Okhotsk. Scientific Reports, 14(1). https://doi.org/10.1038/s41598-024-78108-9