期刊
CHEMICAL GEOLOGY
卷 381, 期 -, 页码 180-193出版社
ELSEVIER
DOI: 10.1016/j.chemgeo.2014.05.012
关键词
Trace metals; Arctic; Surface waters; Permafrost; Active layer; Geochemistry
资金
- U.S. National Science Foundation, Office of Polar Programs to [0806714, 0806643, 0806827]
- National Science Foundation [1023052]
- SnowNET Project through a collaboration
- Matthew Sturm (CRREL-Alaska, now at the University of Alaska Fairbanks)
- Division Of Polar Programs
- Directorate For Geosciences [0806714] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0806643, 0806827] Funding Source: National Science Foundation
Increasing air temperatures in the Arctic have the potential to degrade permafrost and promote the downward migration of the seasonally thawed active layer into previously frozen material. This may expose frozen soils to mineral weathering that could affect the geochemical composition of surface waters. Determining watershed system responses to drivers such as a changing climate relies heavily on understanding seasonal controls on freshwater processes. The majority of studies on elemental concentrations in Arctic river systems have focused on sampling only from spring snowmelt to the summer season. Consequently, there remains a limited understanding of surface water geochemistry, particularly with respect to trace metals, during late fall and early winter. To examine the variability of metal concentrations as a function of seasonality, we measured trace metal concentrations from spring melt to fall freeze-up in 2010 in two high Arctic watersheds: Imnavait Creek, North Slope, Alaska and Roche Mountanee Creek, Brooks Range, Alaska. We focused on aluminum (Al), barium (Ba), iron (Fe), manganese (Mn), nickel (Ni) and zinc (Zn). Concentrations of 'dissolved' (<0.45 mu m) Al, Ba, Fe, and Mn in Imnavait Creek waters and Ba in Roche Mountanee waters were highest in late fall/early winter. To link observed surface water concentrations at Imnavait Creek to parent soil material we analyzed the elemental composition of a soil core from the watershed and tracked the soil temperatures as a function of time and depth. The results from this study show a distinct seasonal signature of trace metal concentrations in late fall that correlates with the depth of the thawed active layer. Published by Elsevier B. V.
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