2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 9:00 AM - 9:15 AM | EXPLAINING TEMPORAL TRENDS AND SPATIAL PATTERNS IN SUMMER STREAM CHEMISTRY FOR SUBARCTIC WATERSHEDS | 302B
EXPLAINING TEMPORAL TRENDS AND SPATIAL PATTERNS IN SUMMER STREAM CHEMISTRY FOR SUBARCTIC WATERSHEDS
The boreal forest of interior Alaska is undergoing unprecedented change in response to a rapidly warming climate, which has tremendous impacts for the regions aquatic ecosystems. However, it is difficult to know whether variability in stream chemistry over time reflects climate signals, hydrologic stochasticity, environmental conditions, or a combination all three. Here, we use dynamic factor analysis to evaluate similarities among temporal trends of solutes in five separate watersheds to understand how drivers representing climate, hydrology, and physiography influence biogeochemical signals. Daily concentrations of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and other solutes (NO3-, NH4+, Ca2+, K+, Mg2+, Na+) collected during the summer from 2002 - 2015 were used to calculate trends. In general, summer stream chemistry in these headwater streams differs among sites, suggesting that driving mechanisms vary by watershed for most solutes. However, watershed characteristics such as permafrost extent partially explained differences in DOC, DIC, and some base cations. These findings contribute to the current understanding of the effects of interannual variability in active layer depths and permafrost extent in subarctic watersheds.
- C10 Biogeochemistry
- C28 Land-Water Interfaces
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
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Presenters/Authors
Claire Ruffing
(), University of British Columbia, ruffing.cathcart@ubc.ca;
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Jeremy Jones
(), Univeristy of Alaska Fairbanks, jbjonesjr@alaska.edu;
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Adrianne Smits
(), University of California, Davis, asmits@ucdavis.edu;
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