Carbon emissions from inland waters may be underestimated: Evidence from European river networks fragmented by drying

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Abstract

River networks contribute disproportionately to the global carbon cycle. However, global estimates of carbon emissions from inland waters are based on perennial rivers, even though more than half of the world's river length is prone to drying. We quantified CO2 and CH4 emissions from flowing water and dry riverbeds across six European drying river networks (DRNs, 120 reaches) and three seasons and identified drivers of emissions using local and regional variables. Drivers of emissions from flowing water differed between perennial and non-perennial reaches, both CO2 and CH4 emissions were controlled partly by the annual drying severity, reflecting a drying legacy effect. Upscaled CO2 emissions for the six DRNs at the annual scale revealed that dry riverbeds contributed up to 77% of the annual emissions, calling for an urgent need to include non-perennial rivers in global estimates of greenhouse gas emissions.

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López-Rojo, N., Datry, T., Peñas, F. J., Singer, G., Lamouroux, N., Barquín, J., … Foulquier, A. (2024, October 1). Carbon emissions from inland waters may be underestimated: Evidence from European river networks fragmented by drying. Limnology And Oceanography Letters. John Wiley and Sons Inc. https://doi.org/10.1002/lol2.10408

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