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Arctic Permafrost: A Toxic Time Bomb?
14 Apr
Summary
- New research reveals hexachlorobutadiene (HCBD) in Arctic permafrost.
- Alaskan permafrost holds an estimated 160 tonnes of HCBD.
- Thawing permafrost may shift from pollution sink to emission source.
New research from the Northwest Institute of Eco-Environment and Resources (NIEER) sheds light on the presence and behavior of persistent organic pollutants (POPs) in Arctic permafrost. Scientists focused on hexachlorobutadiene (HCBD), a novel type of POP, within the sensitive Arctic permafrost region.
Their study collected and analyzed permafrost samples from Alaska, revealing HCBD occurrence characteristics and concentrations across different profiles. This data provides crucial insights into POP migration in high-latitude cryosphere environments. A mass balance estimate indicates approximately 160 tonnes of HCBD are stored in the top 30 centimeters of Alaskan permafrost.
This finding underscores that Arctic permafrost serves as a significant storage site for POPs, akin to its well-known role as a carbon pool. The research identified dissolved organic carbon as the primary factor influencing HCBD distribution, mediated by soil pH and electrical conductivity.
Lead researcher Zhang Yulan stated that permafrost is transitioning from a pollution 'sink' to a potential 'emission source' due to ongoing thawing. These findings are vital for understanding POPs in permafrost and support assessing polar ecological risks and developing global chemical regulations.
