EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/24/2021  |   2:00 PM - 3:30 PM   |  Concentration-discharge relationship for dissolved organic carbon and nitrate in two Arctic watersheds show unpredicted interannual and season variability   |  Virtual Platform

Concentration-discharge relationship for dissolved organic carbon and nitrate in two Arctic watersheds show unpredicted interannual and season variability

Concentration-discharge (C-Q) relationships are often used to characterize solute fluxes from watersheds. However, the temporal variability of C-Q relationships is poorly characterized, especially in the Arctic watersheds. In general, C-Q relationships are controlled by solute availability in terrestrial sources and transport via hydrologic processes. We used three years of high-frequency measurements of dissolved organic carbon (DOC), nitrate (NO3), and Q from two Arctic watersheds to quantify C-Q slopes. We predicted that if there were source controls, the DOC C-Q slope would decrease over the season due to thickening active layer that allows deeper flow paths and greater DOC removal via mineralization. We also predicted that the NO3 C-Q slope would be lowest during peak growing season, as high biotic demand depletes NO3 in soils. If hydrology is the primary control, we expect C-Q slopes to vary with discharge consistently and have no seasonal patterns. We found that DOC and NO3 C-Q slopes vary among years and show no consistent variation over the season or ranges of discharge, indicating that neither terrestrial source or hydrology alone determines the temporal variability in C-Q relationships, adding complexity to Arctic watershed biogeochemical modeling efforts.

  • Ecohydrology
  • Flow regime
  • Ecosystem

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Presenters/Authors

Chao Song (), Michigan State University, chaosong@msu.edu;


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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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Caroline Weidner (), Michigan State University, weidne11@msu.edu;


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Frances Iannucci (), University of Alaska Fairbanks, fiannucci@alaska.edu;


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Alexander Medvedeff (), University of Vermont, Alexander.Medvedeff@uvm.edu;


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William Breck Bowden (), University of Vermont, breck.bowden@uvm.edu;


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