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Overview: We are investigating the responses of arctic tundra stream geomorphology, hyporheic zone hydrology, and biogeochemical cycling to climate change. In particular, we expect that hyporehic exchange dynamics in tundra streams are controlled by 1) channel features (pools, riffles, etc.), and 2) depth of thaw beneath the stream channel. Altered arctic climate will likely alter stream flows and therefore the fluvial geomorphic structure of stream channels. We hypothesize that the potential for hyporheic exchange increases as the climate warms and active layers deepen. At the same time, increased exchange of water between the stream and the hyporheic zone could be driving more or different types of hyporheic biogeochemical cycling, which may alter stream nutrient budgets.
(The text and image above are taken from the project website, see link below)
Web links:
Relevant Publications:
- Bradford, JH, JP McNamara, WB Bowden, and MN Gooseff. 2005. Imaging depth-of-thaw beneath arctic streams using ground-penetrating radar. Hydrological Processes,19(14): 2689-2699.
- Zarnetske JP, MN Gooseff, T Brosten, JH Bradford, JP McNamara, and WB Bowden. Relating transient storage to varied geomorphic, discharge, and hyporheic conditions in Arctic tundra streams. In preparation.
- Gooseff, MN, RA Payn, JP Zarnetske, WB Bowden, JP McNamara, and JH Bradford. A field comparison of mobile-immobile zone responses to instantaneous and constant rate addition stream tracer experiments in two streams with contrasting morphologies, Arctic Alaska. In preparation.
- Bowden, WB, MN Gooseff, JH Bradford, A Green, H Rantala, A Duling, and JP McNamara. Potential impacts of thermokarst formation on freshwater resources in the foothills region of the North Slope, Alaska. In preparation.
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