Abstract
Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of imprint of the increased anthropogenic lead input in this marine environment is not consistent with the increased lead concentrations in nearby lakes over the same period. In addition, the observed trend in lead isotopic composition in our cores suggests an apparent progressive overprint of anthropogenic lead during the 1900s. In other words, isotopes clearly registered the increasingly anthropogenic nature of lead in the sedimentary record, but total lead concentrations remained constant, indicating that some process limited the export of lead to the sediment. These observations point to a long-term limitation of the downward export of particles in Hudson Bay. Given that the source of lead was the same for both Hudson Bay and neighboring high-productivity lakes, we hypothesize that the very low primary productivity of Hudson Bay waters was responsible for the low vertical export of lead to marine sediments. We further propose that primary productivity is the most important factor that generally drives the vertical export of particulate matter, and thus hydrophobic contaminants, in near-oligotrophic marine environments.
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Acknowledgements
All data used in this paper are available in the online supplement. Funding was provided by the Fonds Québécois de la Recherche sur la Nature et les Technologies through an international doctoral internship grant awarded to BT. We thank M. Starr, and the monitoring program for Canadian interior seas (MERICA) funded by the Canadian Department of Fisheries and Oceans, Natural Resources Canada, and the Canadian Coast Guard for providing the cores and the ship time. We are grateful to R. Losno (Institut de physique du globe de Paris) for his assistance with trace metal analyses. We are thankful to the two anonymous reviewers for their constructive input.
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Thibodeau, B., Migon, C., Dufour, A. et al. Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada. Biogeochemistry 136, 279–291 (2017). https://doi.org/10.1007/s10533-017-0395-9
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DOI: https://doi.org/10.1007/s10533-017-0395-9