Sources of riverine mercury across the Mackenzie River Basin : inferences from a combined Hg C isotopes and optical properties approach

Uppsala universitet, Luft-, vatten- och landskapslära Depatment of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden Department of Environmental Research and Monitoring, Swedish Museum of Natural History, Sweden Statistiska centralbyrån (SCB), Statistic Sweden, Stockholm, Sweden Water Quality Center, Trent University, Peterborough, Ontario, Canada Water Quality Center, Trent University, Peterborough, Ontario, Canada Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden Elsevier BV 2022

Campeau, Audrey
Eklöf, Karin
Soerensen, Anne L.
Åkerblom, Staffan
Yuan, Shengliu
Hintelmann, Holger
Bieroza, Magdalena
Köhler, Stephan
Zdanowicz, Christian

The Arctic terrestrial environment harbors a complex mosaic of mercury (Hg) and carbon (C) reservoirs, some of which are rapidly destabilizing in response to climate warming. The sources of riverine Hg across the Mackenzie River basin (MRB) are uncertain, which leads to a poor understanding of potential future release. Measurements of dissolved and particulate mercury (DHg, PHg) and carbon (DOC, POC) concentration were performed, along with analyses of Hg stable isotope ratios (incl. ∆199Hg, d202Hg), radiocarbon content (∆14C) and optical properties of DOC of river water. Isotopic ratios of Hg revealed a closer association to terrestrial Hg reservoirs for the particulate fraction, while the dissolved fraction was more closely associated with atmospheric deposition sources of shorter turnover time. There was a positive correlation between the ∆14C-OC and riverine Hg concentration for both particulate and dissolved fractions, indicating that waters transporting older-OC (14C-depleted) also contained higher levels of Hg. In the dissolved fraction, older DOC was also associated with higher molecular weight, aromaticity and humic content, which are likely associated with higher Hg-binding potential. Riverine PHg concentration increased with turbidity and SO4 concentration. There were large contrasts in Hg concentration and OC age and quality among the mountain and lowland sectors of the MRB, which likely reflect the spatial distribution of various terrestrial Hg and OC reservoirs, including weathering of sulfate minerals, erosion and extraction of coal deposits, thawing permafrost, forest fires, peatlands, and forests. Results revealed major differences in the sources of particulate and dissolved riverine Hg, but nonetheless a common positive association with older riverine OC. These findings reveal that a complex mixture of Hg sources, supplied across the MRB, will contribute to future trends in Hg export to the Arctic Ocean under rapid environmental changes.

Pollution; Waste Management and Disposal; Environmental Chemistry; Environmental Engineering; Geochemistry; Geokemi; Article in journal; info:eu-repo/semantics/article; text

10.1016.j.scitotenv.2021.150808

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English

UPE oai:DiVA.org:uu-458134
0000-0002-9113-8915
0000-0002-1045-5063
doi:10.1016/j.scitotenv.2021.150808
PMID 34637879
ISI:000744101000003
1293952486

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