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Mercury inputs to the Mackenzie River and the Beaufort Sea: Future impacts of permafrost thaw.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Ice, Climate and Environment)
Statistisk centralbyrån SCB.
Swedish University of Agricultural Sciences SLU.
Trent University, Canada.
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2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Recent studies highlighted the existence of a large reservoir of mercury (Hg) stored in frozen soils and peat of the circum-Arctic, and evidence is accumulating that this Hg is being released by permafrost thaw to streams and lakes in the northern Yukon and Northweest Territories. This raises the question whether such releases will increase the net export of Hg by large Arctic rivers to marginal seas of the Arctic Ocean, and thus potentially negating some of the long-term environmental benefits of Hg emissions reductions under the UN Minamata convention. In 2018 we initiated a Swedish-Canadian research project to investigate the sources of Hg entering the Mackenzie River, using an approach that combines measurements of multiple water quality parameters, including isotopes of Hg and carbon (dissolved and particulate). We carried out a sampling survey across the Mackenzie River Basin (MRB) in the summer of 2018, and will extend this with additional sampling in 2019. We will present our initial findings from this study, with a focus on the implications for climate change on the cycling of terrestrial Hg between the MRB and Beaufort Sea.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Mercury, rivers, subarctic, Canada
National Category
Geochemistry
Research subject
Earth Science with specialization in Environmental Analysis
Identifiers
URN: urn:nbn:se:uu:diva-392611OAI: oai:DiVA.org:uu-392611DiVA, id: diva2:1349160
Conference
22nd Northern Research Basins Symposium, Yellowknife, Northwest Territories,Canada, 18-23 Aug.,2019
Available from: 2019-09-06 Created: 2019-09-06 Last updated: 2019-09-06

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