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• W2322982807 startingPage "7644" @default.
• W2322982807 abstract "Circumpolar rivers, including the Mackenzie River in Canada, are sources of the contaminant mercury (Hg) to the Arctic Ocean, but few Hg export studies exist for these rivers. During the 2007–2010 freshet and open water seasons, we collected river water upstream and downstream of the Mackenzie River delta to quantify total mercury (THg) and methylmercury (MeHg) concentrations and export. Upstream of the delta, flow-weighted mean concentrations of bulk THg and MeHg were 14.6 ± 6.2 ng L–1 and 0.081 ± 0.045 ng L–1, respectively. Only 11–13% and 44–51% of bulk THg and MeHg export was in the dissolved form. Using concentration–discharge relationships, we calculated bulk THg and MeHg export into the delta of 2300–4200 kg yr–1 and 15–23 kg yr–1 over the course of the study. Discharge is not presently known in channels exiting the delta, so we assessed differences in river Hg concentrations upstream and downstream of the delta to estimate its influence on Hg export to the ocean. Bulk THg and MeHg concentrations decreased 19% and 11% through the delta, likely because of particle settling and other processes in the floodplain. These results suggest that northern deltas may be important accumulators of river Hg in their floodplains before export to the Arctic Ocean." @default.
• W2322982807 created "2016-06-24" @default.
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• W2322982807 date "2013-06-26" @default.
• W2322982807 modified "2023-10-18" @default.
• W2322982807 title "Mercury Export to the Arctic Ocean from the Mackenzie River, Canada" @default.
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• W2322982807 doi "https://doi.org/10.1021/es400715r" @default.
• W2322982807 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23800098" @default.
• W2322982807 hasPublicationYear "2013" @default.
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