Differences in ebullitive methane release from small, shallow ponds present challenges for scaling.

Autor: Baron AAP; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada., Dyck LT; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada., Amjad H; Department of Geography, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada., Bragg J; School of Natural Resources, University of Missouri, Columbia, MO 65211, United States of America., Kroft E; Department of Geography, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada., Newson J; School of Natural Resources, University of Missouri, Columbia, MO 65211, United States of America., Oleson K; Department of Geography, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada., Casson NJ; Department of Geography, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada., North RL; School of Natural Resources, University of Missouri, Columbia, MO 65211, United States of America., Venkiteswaran JJ; Department of Geography and Environmental Studies, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada., Whitfield CJ; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada. Electronic address: colin.whitfield@usask.ca.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Jan 01; Vol. 802, pp. 149685. Date of Electronic Publication: 2021 Aug 14.
DOI: 10.1016/j.scitotenv.2021.149685
Abstrakt: Small, shallow waterbodies are potentially important sites of greenhouse gas release to the atmosphere. The role of ebullition may be enhanced here relative to larger and deeper systems, due to their shallow water, but these features remain relatively infrequently studied in comparison to larger systems. Herein, we quantify ebullitive release of methane (CH 4 ) in small shallow ponds in three regions of North America and investigate the role of potential drivers. Shallow ponds exhibited open-water season ebullitive CH 4 release rates as high as 40 mmol m -2 d -1 , higher than previously reported for similar systems. Ebullitive release of CH 4 varied by four orders of magnitude across our 15 study sites, with differences in flux rates both within and between regions. What is less clear are the drivers responsible for these differences. There were few relationships between open water-season ebullitive flux and physicochemical characteristics, including organic matter, temperature, and sulphate. Temperature was only weakly related to ebullitive CH 4 release across the study when considering all observation intervals. Only four individual sites exhibited significant relationships between temperature and ebullitive CH 4 release. Other sites were unresponsive to temperature, and region-specific factors may play a role. There is some evidence that where surface water sulphate concentrations are high, CH 4 production and release may be suppressed. Missouri sites (n = 5) had characteristically low ebullitive CH 4 release; here bioturbation could be important. While this work greatly expands the number of open-water season ebullition rates for small and shallow ponds, more research is needed to disentangle the role of different drivers. Further investigation of the potential thresholding behaviour of sulphate as a control on ebullitive CH 4 release in lentic systems is one such opportunity. What is clear, however, is that efforts to scale emissions (e.g., as a function of temperature) must be undertaken with caution.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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