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TitleCombining tree-ring metal concentrations and lead, carbon and oxygen isotopes to reconstruct peri-urban atmospheric pollution
AuthorDoucet, A; Savard, M M; Bégin, C; Marion, J; Smirnoff, A; Ouarda, T B M J
SourceTellus vol. 64, 19005, 2012 p. 1-18, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20110259
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario; Quebec
NTS21M/04; 31H/05; 31D/13
AreaTantare´ Ecological Reserve; Montreal; Quebec City; Georgian Bay Islands; Beausoleil Island
Lat/Long WENS -71.5500 -71.5333 47.0833 47.0667
Lat/Long WENS -73.9500 -73.9500 45.4333 45.4167
Lat/Long WENS -79.8667 -79.8667 44.8833 44.8667
Subjectsgeochemistry; environmental geology; heavy metals contamination; metals; lead; isotopes; carbon isotopes; oxygen isotopes; isotope ratios; lead isotope ratios; vegetation; Air pollution
Illustrationsplots; graphs; tables
ProgramEnvironmental Geoscience, Ecosystems Risk Mitigation
Released2012 08 08
AbstractIn this study, we analysed the tree-ring metal concentrations and isotope ratios of five stands located in three contrasted settings to infer the diffuse air pollution history of the northern part of the Windsor - Québec City Corridor in eastern Canada. Tree-ring series show that the Cd and Zn accumulation rates were higher between 1960 and 1986 and that the long-term acidification of the soil (Ca/Al series) was likely induced by NOx and SOx deposition (d15N and d13C trends as proxy). The Pb concentrations and 206Pb/207Pb ratios indicate that the dominant source of lead from 1880 to the 1920s was the combustion of north-eastern American coal, which was succeeded by the combustion of leaded gasoline from the 1920s to the end of the 1980s. Our modelling approach allows separating the climatic and anthropogenic effects on the tree-ring d13C and d18O responses. Diffuse air pollution caused an enrichment in 13C in all stands and a decrease of the d18O values only in three of the stands. This study indicates that dendrogeochemistry can show contrasted responses to environmental changes and that the combination of several independent indicators constitutes a powerful tool to reconstruct the air pollution history in the complex context of peri-urban regions.