2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | THE GAS THEY PASS: TRACE GAS CONCENTRATION PATTERNS ACROSS NEON STREAMS | Virtual Platform
THE GAS THEY PASS: TRACE GAS CONCENTRATION PATTERNS ACROSS NEON STREAMS
Regional and global carbon budgets recognize that rivers emit substantial amounts of carbon, often driven by groundwater contributions and the respiration of terrestrial organic matter. Although rivers display high variation in greenhouse gas (GHG) flux, upscaling exercises tend to treat river segments as equivalent. The NEON dataset, spanning 26 sites from 2016-2020, facilitates a comprehensive understanding of how GHG concentrations and flux vary across streams. We synthesized chemical and spatial data from NEON sites data to understand variation in GHG concentrations and flux, interrelationships between GHG concentrations, and correlation with watershed-scale properties including channel and catchment slopes, land cover, and soil type. We found that mean CO2 concentrations ranged from <10 to 600 umol/L across sites, CH4 from <0.1 to 9 ?mol/L and N2O from <0.01 to 0.05 ?mol/L. Pearson correlation values between CO2 and CH4 ranged from 0.06 to 0.79, suggesting high variation in relationships between aerobic and anaerobic metabolism that could be related to geomorphology, groundwater – surface water exchange, and methane sources. Our findings will elaborate on the potential to improve our upscaled predictions of stream GHG flux by considering channel and catchment scale characteristics.
- Greenhouse gases
- Biogeochemistry
- Stream
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Presenters/Authors
Amanda DelVecchia
(), Duke University, amanda.delvecchia@duke.edu ;
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Emily Bernhardt
(), Duke University, emily.bernhardt@duke.edu;
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Spencer Rhea
(), Duke University, spencer.rhea@duke.edu;
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