Articles | Volume 20, issue 15
Research article
11 Aug 2023
Research article |  | 11 Aug 2023

Local processes with a global impact: unraveling the dynamics of gas evasion in a step-and-pool configuration

Paolo Peruzzo, Matteo Cappozzo, Nicola Durighetto, and Gianluca Botter

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Cited articles

Appling, A. P., Hall Jr., R. O., Yackulic, C. B., and Arroita, M.: Overcoming equifinality: Leveraging long time series for stream metabolism estimation, J. Geophys. Res.-Biogeo., 123, 624–645, 2018. a
Batchelor, G. K.: Small-scale variation of convected quantities like temperature in turbulent fluid, Part 1 – General discussion and the case of small conductivity, J. Fluid Mech., 5, 113–133, 1959. a
Battin, T. J., Luyssaert, S., Kaplan, L. A., Aufdenkampe, A. K., Richter, A., and Tranvik, L. J.: The boundless carbon cycle, Nat. Geosci., 2, 598–600,, 2009. a
Bernhardt, E. S., Heffernan, J. B., Grimm, N. B., Stanley, E. H., Harvey, J. W., Arroita, M., Appling, A. P., Cohen, M. J., McDowell, W. H., Hall, R. O., Read, J. S., Roberts, B. J., Stets, E. G., and Yackulic, C. B.: The metabolic regimes of flowing waters, Limnol. Oceanogr., 63, S99–S118,, 2018. a
Botter, G., Peruzzo, P., and Durighetto, N.: Heterogeneity Matters: Aggregation Bias of Gas Transfer Velocity Versus Energy Dissipation Rate Relations in Streams, Geophys. Res. Lett., 48, e2021GL094272,, 2021. a, b
Short summary
Small cascades greatly enhance mountain stream gas emissions through the turbulent energy dissipation rate and air bubbles entrained into the water. We numerically studied the local contribution of these mechanisms driving gas transfer velocity used to quantify the outgassing. The gas evasion is primarily due to bubbles concentrated in irregular spots of limited area. Consequently, the gas exchange velocity is scale-dependent and unpredictable, posing concerns about its use in similar scenarios.
Final-revised paper