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- W1966923730 abstract "Methylmercury is a potent neurotoxin that accumulates in aquatic food webs. Human activities, including industry and mining, have increased inorganic mercury inputs to terrestrial and aquatic ecosystems. Methylation of this mercury generates methylmercury, and is thus a public health concern. Marine methylmercury is a particular concern in the Arctic, where indigenous peoples rely heavily on marine-based diets. In the summer, atmospheric inorganic mercury concentrations peak in the Arctic, whereas they reach a minimum in the northern mid-latitudes. Here, we use a global three-dimensional ocean–atmosphere model to examine the cause of this Arctic summertime maximum. According to our simulations, circumpolar rivers deliver large quantities of mercury to the Arctic Ocean during summer; the subsequent evasion of this riverine mercury to the atmosphere can explain the summertime peak in atmospheric mercury levels. We infer that rivers are the dominant source of mercury to the Arctic Ocean on an annual basis. Our simulations suggest that Arctic Ocean mercury concentrations could be highly sensitive to climate-induced changes in river flow, and to increases in the mobility of mercury in soils, for example as a result of permafrost thaw and forest fires. Human activities, including industry and mining, have increased inorganic mercury deposition in terrestrial and aquatic ecosystems. Model simulations indicate that circumpolar rivers deliver large quantities of mercury to the Arctic Ocean during summer." @default.
- W1966923730 created "2016-06-24" @default.
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- W1966923730 date "2012-05-20" @default.
- W1966923730 modified "2023-10-18" @default.
- W1966923730 title "Riverine source of Arctic Ocean mercury inferred from atmospheric observations" @default.
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- W1966923730 doi "https://doi.org/10.1038/ngeo1478" @default.
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