2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 2:45 PM - 3:00 PM | COMPARING SPATIAL PATTERNS OF RIVER WATER ISOTOPES ACROSS NETWORKS | 310 B
COMPARING SPATIAL PATTERNS OF RIVER WATER ISOTOPES ACROSS NETWORKS
A detailed understanding of the spatial and temporal dynamics of water sources across river networks is central to managing the impacts of climate change. Because the stable isotope composition of precipitation varies geographically, variation in surface-water isotope signatures indicates the volume-weighted integration of upstream source water. We measured the isotope composition of surface-water samples collected during summer low-flow across five basins in the Pacific Northwest and SE Alaska (Snoqualmie, Green, Wenatchee, and Skagit Rivers, and Cowee Creek) to examine spatial variation in surface-water isotopes across a range of hydraulic and climatic conditions. We found mean catchment elevation correlated with surface-water isotopic signatures on the west side of the Cascades and Alaska, explaining 41-92% of variation. Conversely, in the Wenatchee, elevation of the catchment had no predicative power. For this basin we built an alternative model to explain the spatial distribution of isotopic variation and compare it to previously published work in the Marys River. In the Snoqualmie, where elevation explained the highest proportion of isotopic variation, we compare isotopic signatures across the network between early and late summer to explore the spatial distribution of residual snowmelt.
- Distribution
- Flow
- Spatial
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Presenters/Authors
Lillian McGill
(), University of Washington , lmcgill@uw.edu;
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E. Ashley Steel
(), PNW Research Station, US Forest Service, asteel@fs.fed.us;
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J. Renee Brooks
(), EPA Western Ecology Division, Brooks.Reneej@epa.gov ;
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Aimee Fullerton
(), Northwest Fisheries Science Center, NOAA, aimee.fullerton@noaa.gov;
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