Experimental investigations into processes controlling stream and hyporheic temperatures,Fryxell Basin,Antarctica |
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Authors: | Karen Cozzetto Diane McKnight Thomas Nylen Andrew Fountain |
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Institution: | 1. Institute for Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA;2. Department of Geology, Portland State University, Portland, OR 97207, USA |
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Abstract: | Glacial meltwater streams in the McMurdo Dry Valleys, Antarctica exhibit daily cycles in temperature with maxima frequently reaching 10–15 °C, often 10 °C above air temperatures. Hydrologic and biogeochemical processes occurring in these streams and their hyporheic zones strongly influence the flux of water, solutes, and sediment to the ice-covered lakes on the valley bottoms. The purpose of this study was to identify the dominant processes controlling water temperature in these polar desert streams and to investigate in particular the role of hyporheic exchange. In order to do this, we analyzed stream temperature patterns on basin-wide, longitudinal, and reach scales. In the basin-wide study, we examined stream temperature monitoring data for seven streams in the Lake Fryxell Basin. For the longitudinal study, we measured temperatures at seven sites along a 5-km length of Von Guerard Stream. |
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Keywords: | Stream temperature Hyporheic zone Heat budgets Antarctica Tracer experiments Polar desert |
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