Active layer and water geochemistry data throughout the Yukon River Basin

Ryan Toohey, Alaska Climate Science Center, rtoohey@usgs.gov (Presenter)
Edda Mutter, Yukon River Inter-Tribal Watershed Council, emutter@yritwc.org
Nicole Herman-Mercer, US Geological Survey, nhmercer@usgs.gov
Paul Schuster, US Geological Survey, pschuste@usgs.gov

The hydrology of the Yukon River Basin has changed over the last several decades as evidenced by a variety of discharge, gravimetric, and geochemical analyses. The Indigenous Observation Network (ION), a community-based project, was initiated by the Yukon River Inter-Tribal Watershed Council and the US Geological Survey. Capitalizing on existing USGS monitoring and research infrastructure while supplementing USGS collected data, ION investigates changes in surface water geochemistry and active layer dynamics throughout the Yukon River Basin. Over 1600 samples of surface water geochemistry (i.e., major ions, dissolved organic carbon, and 18O and 2H) have been collected at 35 sites throughout the Yukon River and its major tributaries over the past decade. Active layer dynamics (maximum thaw depth, soil temperature and moisture) have been collected at 20 sites throughout the Yukon River Basin for the past eight years. Important regional differences in geochemistry and active layer parameters linked to permafrost continuity and tributaries will be highlighted. Additionally, annual trends and seasonal dynamics describing the spatial and temporal heterogeneity of the watershed will be presented in the context of observed hydrological changes. These data assist the global effort to characterize arctic river fluxes and their relationship to the carbon cycle, weathering and permafrost degradation.

Poster Location ID: 94

Session Assigned: Permafrost and Hydrology