Arid
DOI10.1016/j.jhydrol.2017.11.002
Hydrologic exchange and chemical weathering in a proglacial watershed near Kangerlussuaq, west Greenland
Deuerling, Kelly M.; Martin, Jonathan B.; Martin, Ellen E.; Scribner, Cecilia A.
通讯作者Deuerling, Kelly M.
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2018
卷号556页码:220-232
英文摘要

The exchange of proglacial river water with active layer pore water could alter water chemical compositions in glacial outwash plains and oceanic solute fluxes. To evaluate effects of this exchange, we sampled Watson River and adjacent pore water during the 2013 melt season at two sandurs in western Greenland; one in Sandflugtdalen and the other near the confluence with Sondre Stromfjord. We measured temperature, specific conductivity, and head gradients between the river and bank over a week-long period at Sandflugtdalen, as well as sediment hydraulic conductivity and chemical compositions of waters from both sites. Specific conductivity of pore water is four to ten times greater than river water as solutes are concentrated from weathering reactions, cryoconcentration, and evaporation. Pore water compositions are predominantly altered by carbonate dissolution and sulfide mineral oxidation. High concentrations of HCO3 and SO4 result from solute recycling and dissolution of secondary Ca-Mg carbonate/sulfate salts initially formed by near-surface evaporation in the summer and at depth by freeze-in of the active layer and cryoconcentration in the winter. High hydraulic conductivity (10(-5) to 10(-4) m/s) and diurnal fluctuations of river stage during our study caused exchange of river and pore water immediately adjacent to the river channel, with a net loss of river water to the bank. Pore water >6 m from the river continuously flowed away from the river. Approximately 1-8% of the river discharge through the Sandflugtdalen was lost to the river bank during our 6.75 day study based on calculations using Darcy’s Law. Although not sampled, some of this water should discharge to the river during low river stage early and late in the melt season. Elevated pore water solute concentrations in sandurs and water exchange at diurnal and seasonal frequency should impact fluxes of solutes to the ocean, although understanding the magnitude of this effect will require long-term evaluation throughout the melt season. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Hydrologic exchange flows Bank storage Glacial weathering Chemical weathering Proglacial Greenland
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000423641300018
WOS关键词ICE-SHEET ; SUBGLACIAL DRAINAGE ; HYPORHEIC ZONE ; POLAR DESERT ; GROUND-WATER ; FLOW PATHS ; SLUG TEST ; CARBON ; EVOLUTION ; MELTWATER
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/211047
作者单位Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA
推荐引用方式
GB/T 7714
Deuerling, Kelly M.,Martin, Jonathan B.,Martin, Ellen E.,et al. Hydrologic exchange and chemical weathering in a proglacial watershed near Kangerlussuaq, west Greenland[J],2018,556:220-232.
APA Deuerling, Kelly M.,Martin, Jonathan B.,Martin, Ellen E.,&Scribner, Cecilia A..(2018).Hydrologic exchange and chemical weathering in a proglacial watershed near Kangerlussuaq, west Greenland.JOURNAL OF HYDROLOGY,556,220-232.
MLA Deuerling, Kelly M.,et al."Hydrologic exchange and chemical weathering in a proglacial watershed near Kangerlussuaq, west Greenland".JOURNAL OF HYDROLOGY 556(2018):220-232.
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