Water column can shift from sinks to sources of CH4 with increasing river size Article Swipe
Junfeng Wang
,
Xinghui Xia
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.5194/egusphere-egu24-4478
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.5194/egusphere-egu24-4478
CH4 production in freshwaters has been considered to occur primarily in anoxic sediments. However, recent discovery of oxic CH4 production in some lake waters makes the origins and controls over the fate of cumulative CH4 in water column elusive. Especially, whether CH4 can be produced in oxic water column of river systems remains unclear, and the role of water column in CH4 emissions is poorly understood across different river sizes. Here, we present water column contributions to riverine CH4 emissions based on 4-year national-wide in situ measurements across six large river networks with stream order from 3rd to 8th. We find water column acts as a contributor of CH4 net production in 58% observations, indicating the occurrence of CH4 production in oxic water column, which is probably attributed to CH4 production in anoxic interface of suspended particles and production by phytoplankton. Water column can account for 7% of riverine CH4 emissions on average across all observations. Water-air CH4 fluxes decreased exponentially with stream order. In contrast, water column contribution increased with stream order and its roles vary with river size and shift from CH4 sinks in streams to CH4 sources in large rivers. Water column can consume 6% of CH4 released from sediment in rivers of size lower than 6th, while contribute 12% to water-air CH4 fluxes in higher-order rivers. This shift is mainly attributed to the increase of river depth and higher concentrations of suspended particles, which may facilitate net CH4 production in water column of large rivers. Our findings suggest oxic CH4 production in water column represents a hitherto overlooked source of methane and can be important for CH4 cycling and emissions in river systems, especially for large rivers.
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Metadata
- Type
- preprint
- Language
- en
- Landing Page
- https://doi.org/10.5194/egusphere-egu24-4478
- OA Status
- gold
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- 10
- OpenAlex ID
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All OpenAlex metadata
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https://openalex.org/W4392595423Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.5194/egusphere-egu24-4478Digital Object Identifier
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Water column can shift from sinks to sources of CH4 with increasing river sizeWork title
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preprintOpenAlex work type
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enPrimary language
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2024Year of publication
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2024-03-08Full publication date if available
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Junfeng Wang, Xinghui XiaList of authors in order
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https://doi.org/10.5194/egusphere-egu24-4478Publisher landing page
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.5194/egusphere-egu24-4478Direct OA link when available
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Column (typography), Water column, Environmental science, Hydrology (agriculture), Computer science, Geology, Telecommunications, Oceanography, Geotechnical engineering, Frame (networking)Top concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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10Other works algorithmically related by OpenAlex
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