期刊
APPLIED GEOCHEMISTRY
卷 27, 期 4, 页码 815-824出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apgeochem.2012.01.018
关键词
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资金
- ArcticNet
- Natural Sciences and Engineering Research Council of Canada
- Polar Continental Shelf Program of Natural Resources Canada
- Northern Ecosystem Initiative of Environment Canada
- Northern Scientific Training Program of Indian and Northern Affairs Canada
- Central and Arctic Region of the Department of Fisheries and Oceans Canada
The Mackenzie River Basin (MRB) in NW Canada is one of the least human-impacted large watersheds in the world. The western and eastern sub-basins of the MRB are also marked by contrasting geology, geomorphology, hydrology, and biology. These remarkable differences in a remote river basin provide a unique opportunity to probe the biogeochemical processes governing the sources, transport, and bioavailability of Hg at the terrestrial-marine interface and ultimately in the Arctic Ocean. Based on a large dataset of the concentration and speciation of Hg, S and organic matter in surface sediments across the MRB, a source-apportioned budget was constructed for Hg in the MRB. The results indicate that the Hg flux in the basin originates primarily from the weathering of sulfide minerals in the western mountainous sub-basin (similar to 78% of the total), followed by the erosion of coal deposits along the mainstream of the Mackenzie River (similar to 10%), with the remainder split between atmospheric inputs and organic matter-bound Hg (6% and 5%, respectively). Although the Hg flux from the eastern peatland sub-basin only accounts for similar to 10% of the total riverine Hg flux, Hg in this region correlates strongly with labile organic matter, and will likely have a much stronger influence on local biota. (C) 2012 Elsevier Ltd. All rights reserved.
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