Study finds toxic mercury is accumulating in the Arctic tundra

July 12, 2017, University of Massachusetts Lowell
A research team led by UMass Lowell Prof. Daniel Obrist recently returned from two years in the Alaskan tundra where the scientists identified gaseous mercury as the major source of mercury pollution in the region. Credit: UMass Lowell

Vast amounts of toxic mercury are accumulating in the Arctic tundra, threatening the health and well-being of people, wildlife and waterways, according to a UMass Lowell scientist investigating the source of the pollution.

A research team led by Prof. Daniel Obrist, chairman of UMass Lowell's Department of Environmental, Earth and Atmospheric Sciences, found that airborne 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 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," Obrist said. Although the study did not examine the potential impact of global warming, if climate change continues unchecked, it could destabilize these mercury deposits in tundra soils and allow large amounts of the element to find its way into Arctic waters, he added.

Obrist recently completed two years of field research in the tundra, tracking the origin and path of mercury pollution. Working from an observation site in Alaska north of Brooks Range, he and an international group of scientists identified that gaseous mercury in the atmosphere is the source of 70 percent of the pollutant that finds its way into the . 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 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 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."

Obrist will present the team's research at the International Conference on Mercury as a Global Pollutant, which will be held Sunday, July 16 through Friday, July 21 in Providence, R.I. The event is the largest scientific conference on mercury pollution, involving nearly 1,000 participants from research institutions, governments and other agencies.

Obrist hopes to continue to investigate whether gaseous mercury is also a dominant source of pollution in other remote lands. Scientists, regulators and policymakers need a better understanding of how the uptake of gaseous mercury in plants and soils is affecting the environment, including the world's forests, he said.

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 caused by industrialization and other human activities.

Explore further: Polar bears' declining mercury levels likely due to climate-related shifts

More information: Tundra uptake of atmospheric elemental mercury drives Arctic mercury pollution, Nature (2017). nature.com/articles/doi:10.1038/nature22997

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4 comments

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Isotherm7
5 / 5 (1) Jul 13, 2017
Would be interesting to know what fraction comes from coal and what from other sources.
unrealone1
not rated yet Jul 13, 2017
You can do a search for it, half comes from gold mining, there is no way that is going to stop.
1,800,000 kg mercury released every year, about.
That's why i find the CO2 demon so funny, when you look at the mercury levels released every year you could all most cry.
China releases about 570,000 kg a year.
Shootist
not rated yet Jul 16, 2017
You can do a search for it, half comes from gold mining, there is no way that is going to stop.
1,800,000 kg mercury released every year, about.
That's why i find the CO2 demon so funny, when you look at the mercury levels released every year you could all most cry.
China releases about 570,000 kg a year.


NONE comes from GOLD MINING in North America over the past 100 years, both illegal and inefficient way to separate gold from gold bearing materials. In fact, the best way to remove mercury from the environment is to move the contaminated ore through a wash plant in the same manner as gold ore.

PPihkala
5 / 5 (1) Jul 17, 2017
Another good reason to stop burning coal. It pollutes our environment in so many ways:
CO2, mercury and other heavy metals including radioactive ones, toxic coal ash residues leaking to groundwater etc.

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