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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? | LitMetric

AI Article Synopsis

  • A study was conducted to determine if climate change is causing old lead (Pb) contaminants in soil to be released into subarctic lakes, affecting their contaminant levels.
  • Researchers analyzed sediment records from three high-latitude lakes, using the ratio of isotopes (206Pb/207Pb) to differentiate between atmospheric lead and that from local soil.
  • Results showed that, despite significant reductions in atmospheric lead deposition since the 1970s, two lakes were still receiving high levels of lead from soil due to permafrost processes, suggesting climate change may hinder efforts to lower contamination in these lakes.

Article Abstract

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 (206)Pb/(207)Pb ratio between atmospheric contaminants ((206)Pb/(207)Pb ratio <1.16) and geogenic Pb in the catchment soil ((206)Pb/(207)Pb 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 (206)Pb/(207)Pb ratios of sediments deposited after the 1970s appear not to have been strongly affected by the >or=90% reduction in atmospheric deposition rates and increasing (206)Pb/(207)Pb 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.

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Source
http://dx.doi.org/10.1021/es903025zDOI Listing

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