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Lead Contamination of Subarctic Lakes and Its Response to Reduced Atmospheric Fallout: Can the Recovery Process Be Counteracted by the Ongoing Climate Change?
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2010 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 44, no 7, 2335-2340 p.Article in journal (Refereed) Published
Abstract [en]

Can a climate-triggered export of old contaminants from the soil alter the lead (Pb) contaminant burden of subarctic lakes? To address this question, we reconstructed the pollution history of three high latitude lakes situated in a region where a recent climatic shift has occurred. Dated sediment records were used as archives of past Pb inputs to the lakes, where the difference in the Pb-206/Pb-207 ratio between atmospheric contaminants (Pb-206/Pb-207 ratio <1.16) and geogenic Pb in the catchment soil (Pb-206/Pb-207 ratio >1.22) were used to trace fluxes of Pb contaminants. Lead contaminants were found in sediments deposited since Roman times. A significant export of Pb from the soil contaminant pool is indicated in two of the lakes surrounded by near-shore permafrost soils. Here, levels of Pb contaminants and Pb-206/Pb-207 ratios of sediments deposited after the 1970s appear not to have been strongly affected by the >= 90% reduction in atmospheric deposition rates and increasing Pb-206/Pb-207 ratios of atmospheric Pb since the 1990s. We concluded that soil processes stimulated by the ongoing climate change at high latitudes might work counteractive to efforts to reduce contaminant levels in subarctic lakes.

Place, publisher, year, edition, pages
2010. Vol. 44, no 7, 2335-2340 p.
Keyword [en]
NORTHERN SWEDEN; DEPOSITION RECORD; UPLAND CATCHMENT; BOREAL FOREST; ORGANIC-RICH; SEDIMENTS; POLLUTION; SCOTLAND; HOLOCENE; SOILS
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Natural Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-50146DOI: 10.1021/es903025zISI: 000275993700019OAI: oai:DiVA.org:su-50146DiVA: diva2:380545
Note
authorCount :5Available from: 2010-12-21 Created: 2010-12-21 Last updated: 2017-12-11Bibliographically approved

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