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

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5/23/2019  |   2:45 PM - 3:00 PM   |  DIEL VARIATION IN THE STABLE ISOTOPE SIGNATURE OF CO₂ IN PRODUCTIVE STREAMS   |  251 AB

DIEL VARIATION IN THE STABLE ISOTOPE SIGNATURE OF CO₂ IN PRODUCTIVE STREAMS

Dissolved carbon dioxide (CO₂) dynamics in streams are the product of multiple biogenic, geogenic, and atmospheric sources and processes. Spatial variation in the isotopic signature of CO₂ (¹³C-CO₂) has been used to attribute CO₂ to different sources, but diel temporal variation in ¹³C-CO₂ has rarely been used to separate variation catchment sources of CO₂ from in-stream CO₂ production and consumption. Here we continuously monitored dissolved oxygen, CO₂, pH, and temperature with sensors and used discrete water samples for analysis of ¹³C-CO₂, alkalinity, and dissolved inorganic carbon (DIC) over four, 24 h periods in three streams in Montana and Arizona, USA. Diel variation in CO₂ ranged up to 19.8 mmol CO₂ L^-1 and 4.9 ‰ ¹³C-CO₂ with the highest concentrations of CO₂ and the most depleted ¹³C at night. We report how estimates of gross primary productivity and ecosystem respiration vary among models which incorporate CO₂ isotopes and use asynchrony in the timing of CO₂ and ¹³C-CO₂ to inform our understanding of in-stream carbon transformations. Modeling diel variation in stable C-CO₂ isotopes can help our understanding of how whole-stream metabolic rates that influence stream carbon storage, transformation, and transport.

• Isotope
• Primary Production
• Metabolism

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Presenters/Authors

Joanna Blaszczak (), Global Water Center and Department of Natural Resources and Environmental Science, University of Nevada, Reno, jblaszczak@unr.edu;

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Robert O. Hall (), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;

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ASHA DISCLOSURE:

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Nonfinancial -