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

Author:

López‐Rojo Naiara12ORCID,Datry Thibault2ORCID,Peñas Francisco J.3ORCID,Singer Gabriel4ORCID,Lamouroux Nicolas2ORCID,Barquín José3ORCID,Rodeles Amaia A.3ORCID,Silverthorn Teresa2ORCID,Sarremejane Romain25ORCID,del Campo Rubén4ORCID,Estévez Edurne4ORCID,Mimeau Louise2ORCID,Boyer Frédéric1ORCID,Künne Annika6ORCID,Dalvai Ragnoli Martin4ORCID,Foulquier Arnaud1ORCID

Affiliation:

1. University of Grenoble Alpes, University of Savoie Mont Blanc, CNRS, LECA, Laboratoire d'Ecologie Alpine Grenoble France

2. National Research Institute for Agriculture, Food and Environment (INRAE), RIVERLY, Lyon‐Grenoble Auvergne‐Rhône‐Alpes Center Villeurbanne France

3. IHCantabria‐Instituto de Hidráulica Ambiental de la Universidad de Cantabria Santander Spain

4. Department of Ecology University of Innsbruck Innsbruck Austria

5. School of Science and Technology Nottingham Trent University Nottingham UK

6. Department of Geoinformation Science Friedrich Schiller University Jena Germany

Abstract

AbstractRiver 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.

Publisher

Wiley

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