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High Quantities of Microplastic in Arctic Deep-Sea Sediments from the HAUSGARTEN Observatory
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Researchers found high quantities of microplastics in deep-sea sediments from the Arctic HAUSGARTEN observatory, demonstrating that even remote deep Arctic seafloor environments have accumulated significant microplastic pollution.
Although mounting evidence suggests the ubiquity of microplastic in aquatic ecosystems worldwide, our knowledge of its distribution in remote environments such as Polar Regions and the deep sea is scarce. Here, we analyzed nine sediment samples taken at the HAUSGARTEN observatory in the Arctic at 2340-5570 m depth. Density separation by MicroPlastic Sediment Separator and treatment with Fenton's reagent enabled analysis via Attenuated Total Reflection FTIR and μFTIR spectroscopy. Our analyses indicate the wide spread of high numbers of microplastics (42-6595 microplastics kg-1). The northernmost stations harbored the highest quantities, indicating sea ice as a possible transport vehicle. A positive correlation between microplastic abundance and chlorophyll a content suggests vertical export via incorporation in sinking (ice-) algal aggregates. Overall, 18 different polymers were detected. Chlorinated polyethylene accounted for the largest proportion (38%), followed by polyamide (22%) and polypropylene (16%). Almost 80% of the microplastics were ≤25 μm. The microplastic quantities are among the highest recorded from benthic sediments. This corroborates the deep sea as a major sink for microplastics and the presence of accumulation areas in this remote part of the world, fed by plastics transported to the North via the Thermohaline Circulation.
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Researchers deployed large-volume water pumps at four depths from the sea surface to near the seafloor at five stations in the Arctic HAUSGARTEN observatory, finding microplastics at all depths across all stations. The results confirm that microplastic contamination extends throughout the entire water column in even remote Arctic deep-sea environments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.