2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 2:00 PM - 3:30 PM | REVEALING RELATIONSHIPS BETWEEN ARCTIC WATERSHED ATTRIBUTES AND STREAM CHEMISTRY: DIFFERENT SOLUTES, DIFFERENT DRIVERS | Virtual Platform
REVEALING RELATIONSHIPS BETWEEN ARCTIC WATERSHED ATTRIBUTES AND STREAM CHEMISTRY: DIFFERENT SOLUTES, DIFFERENT DRIVERS
The Arctic is warming at twice the rate of lower latitudes, altering the timing, volume, and pathways of water and solute movement through permafrost-underlain landscapes. Studying how climate change will manifest across the complex Arctic landscape is challenging, due to the interaction between landscape features and changing hydrology. Here, we apply an inductive inquiry approach to spatially-explicit landscape and stream solute chemistry data from repeated synoptic sampling events. Specifically, we leverage boosted regression tree (BRT) analyses to examine how landscape characteristics and season influence a suite of 40 stream solutes in 123 subcatchments nested within three watersheds on the North Slope of Alaska. The BRT approach revealed potentially critical links between landscape level watershed characteristics and solute concentrations in Arctic permafrost streams. Model predictive power varied widely for individual solutes (cross validation R2 range 0.007-0.915). Seasonality (early vs. late thaw) and watershed specific discharge frequently emerged as relatively high importance factors influencing stream solute chemistry. Interestingly, landscape characteristics that covered relatively small watershed areas were found to strongly influence some solutes. These findings offer critical insight into how climate change will interact with the complex Arctic landscape.
- Biogeochemistry
- Climate change
- Ecohydrology
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Presenters/Authors
Tanner Williamson
(), Michigan State University, tanner.williamson@gmail.com;
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Jay Zarnetske
(), Department of Earth and Environmental Sciences, Michigan State University, jpz@msu.edu;
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Arial Shogren
(), Department of Earth and Environmental Sciences, Michigan State University, shogrena@msu.edu;
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Amelia Grose
(), Michigan State University, groseame@msu.edu ;
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