Coal power plants still to blame for emitting most of the toxic mercury pollution
Mercury continues to build up in Arctic ecosystems at levels that threaten the health and well-being of people, wildlife and waterways in the region.
A new study that looks at the sources of the toxic metal shows that airborne mercury is gathering in the Arctic tundra, where it gets deposited in the soil and ultimately runs off into waters. Scientists have long reported high levels of mercury pollution in the Arctic. The new research identifies gaseous mercury as its major source and sheds light on how the element gets there.
“Now we understand how such a remote site is so exposed to mercury,” said Daniel Obrist, chairman of UMass Lowell’s Department of Environmental, Earth and Atmospheric Sciences. He warned that warming in the Arctic could destabilize these mercury deposits in tundra soils and allow large amounts of the element to find its way into Arctic waters.
The findings are based on two years of field work. Based at an observation site in Alaska, Obrist tracked the origins and path of mercury pollution. His research team found that gaseous mercury in the atmosphere is the source of 70 percent of the pollutant that finds its way into the tundra soil.
In contrast, airborne mercury that is deposited on the ground through rain or snow – a more frequent focus of other studies – accounts for just 2 percent of the mercury deposits in the region, Obrist’s team found.
The new research is the most comprehensive investigation on how mercury is deposited in the Arctic. The full results of the study, which was supported by the National Science Foundation, appear in the July 13 edition of the prestigious academic journal Nature.
Mercury is a harmful pollutant, threatening fish, birds and mammals across the globe. The dominant source of mercury pollution in the atmosphere is hundreds of tons of the element that are emitted each year through the burning of coal, mining and other industrial processes across the globe.
This gaseous mercury is lofted to the Arctic, where it is absorbed by plants in a process similar to how they take up carbon dioxide. Then, the mercury is deposited in the soil when the plants shed leaves or die. As a result, the tundra is a significant repository for atmospheric mercury being emitted by industrialized regions of the world.
“This mercury from the tundra soil explains half to two-thirds of the total mercury input into the Arctic Ocean,” Obrist said, adding that scientists had previously estimated mercury runoff from tundra soil supplies 50 to 85 tons of the heavy metal to Arctic waters each year.
Exposure to high levels of mercury over long periods can lead to neurological and cardiovascular problems. The results are being felt by Arctic people and wildlife.
“Mercury has high exposure levels in northern wildlife, such as beluga whales, polar bears, seals, fish, eagles and other birds,” Obrist said. “It also affects human populations, particularly the Inuit, who rely on traditional hunting and fishing.”
The research findings underscore the importance of the Minamata Convention on Mercury, the first global treaty that aims to protect human health and the environment from the element’s adverse effects, Obrist said. Signed by the United States and more than 120 other countries, the pact will take effect next month, with the goal of reducing mercury emissions caused by industrialization and other human activities.