Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0022-1694 |
EISSN | 1879-2707 |
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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