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Ebullition Controls on CH4 Emissions in an Urban, Eutrophic River: A Potential Time-Scale Bias in Determining the Aquatic CH4 Flux

  • Shu Chen
    Shu Chen
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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    Orcidhttps://orcid.org/0000-0001-9656-5249
  • , 
  • Dongqi Wang*
    Dongqi Wang
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
    Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai Science and Technology Committee, East China Normal University, 200241 Shanghai, China
    *Email: [email protected]. Phone: +86-21-54341201.
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  • , 
  • Yan Ding
    Yan Ding
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Zhongjie Yu
    Zhongjie Yu
    Department of Natural Resources and Environmental Sciences, University of Illinois Urbana-Champaign, 61801-3028 Urbana, Illinois, United States
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  • , 
  • Lijie Liu
    Lijie Liu
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Yu Li
    Yu Li
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Dong Yang
    Dong Yang
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Yingyuan Gao
    Yingyuan Gao
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Haowen Tian
    Haowen Tian
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , 
  • Rui Cai
    Rui Cai
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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  • , and 
  • Zhenlou Chen
    Zhenlou Chen
    Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, 200241 Shanghai, China
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Cite this: Environ. Sci. Technol. 2021, 55, 11, 7287–7298
Publication Date (Web):May 18, 2021
https://doi.org/10.1021/acs.est.1c00114
Copyright © 2021 American Chemical Society
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    Abstract

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    Rivers and streams contribute significant quantities of methane (CH4) to the atmosphere. However, there is a lack of CH4 flux and ebullitive (bubble) emission data from urban rivers, which might lead to large underestimations of global aquatic CH4 emissions. Here, we conducted high-frequency surveys using the boundary layer model (BLM) supplemented with floating chambers (FCs) and bubble traps to investigate the seasonal and diurnal variability in CH4 emissions in a eutrophic urban river and to evaluate whether the contribution of bubbles is important. We found that ebullition contributed nearly 99% of CH4 emissions and varied on hourly to seasonal time scales, ranging from 0.83 to 230 mmol m–2 d–1, although diffusive emissions and CH4 concentrations in bubbles did not exhibit temporal variability. Ebullitive CH4 emissions presented high temperature sensitivity (r = 0.6 and p < 0.01) in this urban river, and eutrophication might have triggered this high temperature sensitivity. The ebullitive CH4 flux is more likely to be underestimated at low temperatures because capturing the bubble flux is more difficult, given the low frequency of ebullition events. This study suggests that future ebullition measurements on longer time scales are needed to accurately quantify the CH4 budgets of eutrophic urban rivers.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.est.1c00114.

    • Location of the sampling site and sampling points on the pier; schematic diagram of the floating chamber and bubble trap; diagram of CH4 fluxes collected from previous studies; diagram of success probability trends with increasing subset measurement durations; water chemistry in the studied river; differences in ebullition rates; concentration of different GHGs in the bubbles; comparison of bubble flux, diffusion flux, and total flux via the FC method; correlations among different CH4 fluxes, temperature, and DO; comparison with Q10 and Ea from other rivers, lakes, and ponds; and comparison with CH4 fluxes from other rivers, lakes, and reservoirs (PDF)

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    This article is cited by 15 publications.

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