2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:15 PM - 2:30 PM | SCALING GAS-EXCHANGE FROM LOW TO HIGH-ENERGY STREAMS | 330 B
SCALING GAS-EXCHANGE FROM LOW TO HIGH-ENERGY STREAMS
Estimating gas exchange across the air-water boundary in aquatic ecosystems is a key component to understanding biogeochemical and metabolic fluxes. Most knowledge on gas exchange in streams is based on tracer gas experiments conducted in low slope (<10%), low-energy streams. Globally, however, a significant proportion of stream slopes likely exceed 10%, but we know little how gas exchange scales to these high-energy streams. We combined 638 published estimates of gas exchange (k600, m d-1) from low sloped and sub-alpine streams with 60+ new estimates of k600 from mountain streams to understand how k600 scales from the flatlands to the mountains. Stream slopes ranged from 0.002-19%, stream discharge from 0.001-209 m3 s-1, and k600 from 0.1-4118 m d-1. Gas exchange scaled with stream energy dissipation rate (eD, m2 s-3) and depth, which explained 69% of the variability in k600. In low-energy streams, k600 increased rapidly relative to eD, but that rate decreased with increasing eD. Our findings highlight the high k600 in high-energy streams not accounted for by current models to predict gas exchange in streams globally, which has implications for scaling gas fluxes from streams and rivers to the atmosphere.
- Hydrology
- Modeling
- Spatial
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Presenters/Authors
Amber Ulseth
(), Sam Houston State University, amber.ulseth@epfl.ch;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Hilary Madinger
(), University of Wyoming, hilary.madinger@gmail.com;
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Tom Battin
(), Ecole Polytechnique Fédérale de Lausanne, tom.battin@epfl.ch;
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