Global CO2 emissions from dry inland waters share common drivers across ecosystems

P. Keller (1) , N. Catalan (2, 3) , D. von Schiller (4) , H.-P. Grossart (5, 6) , M. Koschorreck (1) , B. Obrador (4) , M. Frassl (1, 7) , N. Karakaya (8) , Noémi Barros (9, 10) , J. Howitt (11) , C. Mendoza-Lera (12) , A. Pastor (13) , G. Flaim (14) , R. Aben (15) , T. Riis (13) , M. Arce (16) , G. Onandia (17) , J. Paranaíba (10) , A. Linkhorst (18) , R. del Campo (19, 20) , A. Amado (10, 21) , S. Cauvy-Fraunié (12) , S. Brothers (22) , J. Condon (11) , R. Mendonça (10) , F. Reverey (17) , E.-I. Rõõm (23) , T. Datry (12) , F. Roland (10) , A. Laas (23) , U. Obertegger (14) , J.-H. Park (24) , H. Wang (25) , S. Kosten (15) , R. Gomez (20) , C. Feijoó (26) , A. Elosegi (27) , M. Sánchez-Montoya (20) , C. M. Finlayson (11, 28) , M. Melita (29) , E. Oliveira Junior (15, 30) , C. Muniz (30) , L. Gómez-Gener (31) , C. Leigh (7, 32, 33) , Q. Zhang (34, 35) , R. Marcé (2, 3)

1 UFZ - Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research
2 ICRA - Instituto Catalán de Investigación del Agua - ICRA (SPAIN)
3 UdG - Universitat de Girona
4 University of Barcelona
5 IGB - Leibniz-Institut für Gewässerökologie und Binnenfischerei
6 University of Potsdam = Universität Potsdam
7 Australian Rivers Institute
8 Abant Izzet Baysal University - Bolu Abant İzzet Baysal Üniversitesi
9 LNMO - Laboratoire de Nanophysique Magnétisme et Optoélectronique
10 UFJF - Universidade Federal de Juiz de Fora
11 Charles Sturt University [Australia]
12 RiverLy - RiverLy - Fonctionnement des hydrosystèmes
13 Aarhus University [Aarhus]
14 FEM - Fondazione Edmund Mach - Edmund Mach Foundation [Italie]
15 Radboud University [Nijmegen]
16 IGB - Leibniz Institute of Freshwater Ecology and Inland Fisheries
17 ZALF - Leibniz-Zentrum für Agrarlandschaftsforschung = Leibniz Centre for Agricultural Landscape Research
18 Uppsala University
19 Leopold Franzens Universität Innsbruck - University of Innsbruck
20 Universidad de Murcia
21 UFRN - Universidade Federal do Rio Grande do Norte [Natal]
22 USU - Utah State University
23 EMU - Estonian University of Life Sciences
24 EWHA - EWHA Womans University
25 CJLU - China Jiliang University
26 Universidad Nacional de Luján [Buenos Aires]
27 UPV / EHU - University of the Basque Country = Euskal Herriko Unibertsitatea
28 IHE Delft - Institute for Water Education
29 IRSA - CNR Water Research Institute
30 UFMT - Universidade Federal de Mato Grosso
31 Umeå University
32 QUT - Queensland University of Technology [Brisbane]
33 RMIT University - Royal Melbourne Institute of Technology University
34 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
35 Niglas - Nanjing Institute of Geography and Limnology

Many inland waters exhibit complete or partial desiccation, or have vanished due to global change, exposing sediments to the atmosphere. Yet, data on carbon dioxide (CO2) emissions from these sediments are too scarce to upscale emissions for global estimates or to understand their fundamental drivers. Here, we present the results of a global survey covering 196 dry inland waters across diverse ecosystem types and climate zones. We show that their CO2 emissions share fundamental drivers and constitute a substantial fraction of the carbon cycled by inland waters. CO2 emissions were consistent across ecosystem types and climate zones, with local characteristics explaining much of the variability. Accounting for such emissions increases global estimates of carbon emissions from inland waters by 6% (~0.12 Pg C y−1). Our results indicate that emissions from dry inland waters represent a significant and likely increasing component of the inland waters carbon cycle.

Mots clés: Carbon-dioxide emissions; Greenhouse-gas emissions; Ch4 emissions; Lakes; Fluxes; Respiration; Reservoirs; Responses; Drawdown; Exchange; Carbon cycle; Hydrology

Domaines: Sciences de l'environnement; Biodiversité et Ecologie

P. Keller, N. Catalan, D. von Schiller, H.-P. Grossart, M. Koschorreck, et al.. Global CO2 emissions from dry inland waters share common drivers across ecosystems. Nature Communications, 2020, 11 (1), pp.1-8. ⟨10.1038/s41467-020-15929-y⟩. ⟨hal-02905476⟩