The concentration of CH4, N2O and CO2 in the Pearl River estuary increased significantly due to the sediment particle resuspension and the interaction of hypoxia

Liu, Shuangyuan; Gao, Quanzhou; Wu, Jiaxue; Xie, Yuting; Yang, Qianqian; Wang, Ruowen; Cui, Yongsheng

doi:10.1016/j.scitotenv.2023.168795

Science of The Total Environment

2024

DOI: 10.1016/j.scitotenv.2023.168795

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The concentration of CH4, N2O and CO2 in the Pearl River estuary increased significantly due to the sediment particle resuspension and the interaction of hypoxia

Shuangyuan Liu,

Quanzhou Gao,

Jiaxue Wu

et al.

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Cited by 3 publications

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Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Liu,

Gao,

Tang

et al. 2024

Environ Sci Pollut Res

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Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Liu,

Gao,

Tang

et al. 2024

Environ Sci Pollut Res

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Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Wang,

Li,

et al. 2024

ACS EST Water

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Rivers play a non-negligible role in global methane (CH 4 ) emissions. However, little research has focused on CH 4 emissions from rivers with high suspended sediment (SPS) concentrations, and how SPS influences riverine CH 4 emissions is still unclear. In this study, significant CH 4 emissions were observed in the upper reaches of the Yellow River, despite the extremely low organic-C level (DOC = 2.2 mg/L). The average value of CH 4 flux was 107.7 μmol m −2 d −1 , which was even higher than that of urban rivers with high organic pollution. The CH 4 emission pattern in the Yellow River differed from that of typical rivers; SPS rather than sediment plays an important role. In the upper reaches, anaerobic/aerobic microenvironments are more easily established on SPS under lower DO conditions, resulting in a high abundance of methanogens and functional genes. The genus Methanobacterium, typically found in sediments, was dominant in the water column and positively related to SPS concentrations. The strong winds and water flow further enhanced the mass transfer from the SPS surface to the atmosphere. Overall, this study demonstrates the significant potential of low-organic-country rivers to act as CH 4 hotspots in the presence of SPS.

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Divergent Responses of Organic Carbon to Sedimentary Environment Transformation in a River‐Dominated Marginal Sea

Zhang,

Lu,

Wang

et al. 2024

JGR Biogeosciences

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The fate of organic carbon (OC) in most river‐dominated ocean margins (RiOMars) has undergone a noticeable transformation with the increased sediment retention engineering in watersheds. In the East China Sea (ECS), transformation in sediment and the influence of bulk OC have been broadly studied. However, the response of different mechanisms of OC protection under transformation has not been investigated, hindering our understanding of the factors that control OC deposition. In this study, we isolated different OC fractions, analyzed the basic parameters of the sediments, and compared the previous study's data to reveal how OC deposition responded to transformation. Our research indicates that transformation leads to the reduction of OC associated with minerals and sorting of OC occluded by plant debris and OC associated with minerals resulting in increased decomposition and mineralization of OC. The transformation affects the mechanism of OC binding with reactive iron (FeR), increasing FeR‐protected OC content. Still, the co‐precipitation mechanism and the intense redox environment in the mud deposit decrease the FeR‐protected OC stability. Taken together, the impact of transformation is to increase the risk of OC decomposition and to weaken the OC preservation ability in RiOMars as carbon sinks. This study has implications for river‐dominated passive margins subject to increased sediment retention engineering in watersheds worldwide and deserves more attention.

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The concentration of CH4, N2O and CO2 in the Pearl River estuary increased significantly due to the sediment particle resuspension and the interaction of hypoxia

Cited by 3 publications

References 84 publications

Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Divergent Responses of Organic Carbon to Sedimentary Environment Transformation in a River‐Dominated Marginal Sea

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The concentration of CH4, N2O and CO2 in the Pearl River estuary increased significantly due to the sediment particle resuspension and the interaction of hypoxia

Cited by 3 publications

References 84 publications

Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Distribution and control mechanism of pCO2 and water–air CO2 efflux in the Pearl River Estuary

Significant CH4 Emissions from the Yellow River: Importance of Suspended Sediment

Divergent Responses of Organic Carbon to Sedimentary Environment Transformation in a River‐Dominated Marginal Sea

Contact Info

Product

Resources

About

Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment