Researchers have found that mercury levels in Arctic animals continue to rise, defying efforts to reduce new emissions. A study analyzing over 700 samples across Greenland shows that legacy mercury, released centuries ago, is now the main source of pollution in the region.
The study, published in Nature Communications, used isotope analysis to track the sources and transport pathways of mercury in the Arctic. The results show that modern tissues from polar bears, seals, fish, and peat contain higher levels of mercury than expected, with some species carrying up to 30 times more than pre-industrial levels.
The team found that the Irminger Current, a branch of the North Atlantic, is bringing legacy mercury from the Arctic Ocean into Greenland. This legacy mercury has lingered in the ocean for centuries and is now being carried northward by the current.
The study’s findings have significant implications for policymakers, who must consider the long-term effects of climate-driven shifts in currents on mercury levels. The team recommends pairing emission goals with monitoring, dietary guidance for northern communities, and studies on how changes in currents could impact the toxic flow.
As one scientist noted, “Mercury affects the immune system, reproduction, and possibly sensory functions in animals, which can impact their survival.” The study’s results underscore the need for continued action to reduce mercury emissions and protect Arctic wildlife.
Source: https://www.earth.com/news/mercury-pollution-rides-ocean-currents-north-threatening-arctic-wildlife