Tracing groundwater discharge in a High Arctic lake using radon-222

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• 作者：Hilary A. Dugan (1) hdugan3@uic.edu
  Tom Gleeson (2)
  Scott F. Lamoureux (3)
  Kent Novakowski (4)
• 关键词：Groundwater &#8211 ; Arctic lake &#8211 ; Hypersaline &#8211 ; Radon ; 222 &#8211 ; Permafrost
• 刊名：Environmental Earth Sciences
• 出版年：2012
• 出版时间：July 2012
• 年：2012
• 卷：66
• 期：5
• 页码：1385-1392
• 全文大小：514.1 KB
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• 作者单位：1. Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA2. Department of Civil Engineering, McGill University, Montreal, QC H3A 2K6, Canada3. Department of Geography, Queen鈥檚 University, Kingston, ON K7L 3N6, Canada4. Department of Civil Engineering, Queen鈥檚 University, Kingston, ON K7L 3N6, Canada
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

In the High Arctic, groundwater fluxes are limited by the presence of continuous permafrost, although it has been hypothesized that there may be localized groundwater flow and hydraulic connectivity beneath large lakes, due to the presence of taliks, or large regions of unfrozen ground. However, due to the logistical difficulty of employing seepage meters and piezometers in deep, ice-covered lakes, relatively little is known about groundwater discharge to polar lakes. One method of assessing groundwater discharge is through the use of geochemical tracers. We conducted a pilot study to quantify groundwater discharge into a High Arctic lake using dissolved radon gas as a geochemical tracer. Lake water was collected in 15 L polyvinyl chloride (PVC) bags with minimal atmospheric interaction from a 25-m deep lake near Shellabear Point, Melville Island, Northwest Territories, Canada. Sample bags were aerated through a closed water loop for 60 min to allow sufficient radon to equilibrate in a coupled air circuit. Radon in air concentrations were measured on a Durridge RAD7 portable alpha spectrometer. The field trial in a remote setting and separate tests with groundwater samples collected from a temperate site demonstrate the utility of the methodology. The limited results suggest that radon levels in the lower water column are elevated above background levels following nival melt in the surrounding watershed. Although these results are insufficient to quantify groundwater discharge, the results suggest subsurface flow may exist, and further study is warranted.