Dépôt numérique

Quantification of Spatial and Temporal Trends in Atmospheric Mercury Deposition across Canada over the Past 30 Years.

Roberts, Sarah L., Kirk, Jane L., Muir, Derek C. G., Wiklund, Johan A., Evans, Marlene S., Gleason, Amber, Tam, Allison, Drevnick, Paul E., Dastoor, Ashu, Ryjkov, Andrei, Yang, Fan, Wang, Xiaowa, Lawson, Greg, Pilote, Martin, Keating, Jonathan, Barst, Benjamin D., Ahad, Jason M. E. et Cooke, Colin A. (2021). Quantification of Spatial and Temporal Trends in Atmospheric Mercury Deposition across Canada over the Past 30 Years. Environmental Science & Technology , vol. 55 , nº 23. pp. 15766-15775. DOI: :10.1021/acs.est.1c04034.

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Mercury (Hg) is a pollutant of concern across Canada and transboundary anthropogenic Hg sources presently account for over 95% of national anthropogenic Hg deposition. This study applies novel statistical analyses of 82 high-resolution dated lake sediment cores collected from 19 regions across Canada, including nearby point sources and in remote regions and spanning a full west–east geographical range of ∼4900 km (south of 60°N and between 132 and 64°W) to quantify the recent (1990–2018) spatial and temporal trends in anthropogenic atmospheric Hg deposition. Temporal trend analysis shows significant synchronous decreasing trends in post-1990 anthropogenic Hg fluxes in western Canada in contrast to increasing trends in the east, with spatial patterns largely driven by longitude and proximity to known point source(s). Recent sediment-derived Hg fluxes agreed well with the available wet deposition monitoring. Sediment-derived atmospheric Hg deposition rates also compared well to the modeled values derived from the Hg model, when lake sites located nearby (<100 km) point sources were omitted due to difficulties in comparison between the sediment-derived and modeled values at deposition “hot spots”. This highlights the applicability of multi-core approaches to quantify spatio-temporal changes in Hg deposition over broad geographic ranges and assess the effectiveness of regional and global Hg emission reductions to address global Hg pollution concerns.

Type de document: Article
Mots-clés libres: pan-Canadian; mercury; sediment proxy; archive; model; in situ measurements; anthropogenic pollution
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 juin 2022 14:27
Dernière modification: 23 juin 2022 14:27
URI: https://espace.inrs.ca/id/eprint/12694

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