Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions

被引：0
作者：
Lluís Gómez-Gener
Gerard Rocher-Ros
Tom Battin
Matthew J. Cohen
Higo J. Dalmagro
Kerry J. Dinsmore
Travis W. Drake
Clément Duvert
Alex Enrich-Prast
Åsa Horgby
Mark S. Johnson
Lily Kirk
Fausto Machado-Silva
Nicholas S. Marzolf
Mollie J. McDowell
William H. McDowell
Heli Miettinen
Anne K. Ojala
Hannes Peter
Jukka Pumpanen
Lishan Ran
Diego A. Riveros-Iregui
Isaac R. Santos
Johan Six
Emily H. Stanley
Marcus B. Wallin
Shane A. White
Ryan A. Sponseller
机构：
[1] Ecole Polytechnique Fédérale de Lausanne,Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering
[2] Umeå University,Department of Ecology and Environmental Science
[3] University of Florida,School of Forest Resources and Conservation
[4] University of Cuiabá,Department of Environmental Systems Science
[5] Centre for Ecology and Hydrology,Research Institute for the Environment and Livelihoods
[6] Bush Estate,Biogas Research Center and Department of Thematic Studies–Environmental Change
[7] ETH Zürich,Post
[8] Charles Darwin University,Graduate Program in Geosciences (Environmental Geochemistry), Chemistry Institute
[9] Linköping University,Institute for Resources, Environment and Sustainability
[10] Fluminense Federal University,Department of Earth, Ocean and Atmospheric Sciences
[11] University of British Columbia,School of Natural Resources and Environment
[12] University of British Columbia,Department of Forestry and Environmental Resources
[13] University of Florida,Department of Natural Resources and the Environment
[14] North Carolina State University,Department of Forest Ecology and Management
[15] University of New Hampshire,Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme
[16] Swedish University of Agricultural Sciences,Department of Environmental and Biological Sciences
[17] University of Helsinki,Department of Geography
[18] University of Eastern Finland,Department of Geography
[19] The University of Hong Kong,Department of Marine Sciences
[20] University of North Carolina at Chapel Hill,Center for Limnology
[21] University of Gothenburg,Department of Aquatic Sciences and Assessment
[22] University of Wisconsin-Madison,National Marine Science Centre
[23] Swedish University of Agricultural Sciences,undefined
[24] Southern Cross University,undefined
来源：
Nature Geoscience | 2021年 / 14卷
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摘要：
Carbon dioxide (CO2) emissions to the atmosphere from running waters are estimated to be four times greater than the total carbon (C) flux to the oceans. However, these fluxes remain poorly constrained because of substantial spatial and temporal variability in dissolved CO2 concentrations. Using a global compilation of high-frequency CO2 measurements, we demonstrate that nocturnal CO2 emissions are on average 27% (0.9 gC m−2 d−1) greater than those estimated from diurnal concentrations alone. Constraints on light availability due to canopy shading or water colour are the principal controls on observed diel (24 hour) variation, suggesting this nocturnal increase arises from daytime fixation of CO2 by photosynthesis. Because current global estimates of CO2 emissions to the atmosphere from running waters (0.65–1.8 PgC yr−1) rely primarily on discrete measurements of dissolved CO2 obtained during the day, they substantially underestimate the magnitude of this flux. Accounting for night-time CO2 emissions may elevate global estimates from running waters to the atmosphere by 0.20–0.55 PgC yr−1.
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页码：289 / 294
页数：5
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