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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