气候变化领域集成服务门户(CCPortal): Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions

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DOI	10.1038/s41561-021-00722-3
	Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions
	Gómez-Gener L.; Rocher-Ros G.; Battin T.; Cohen M.J.; Dalmagro H.J.; Dinsmore K.J.; Drake T.W.; Duvert C.; Enrich-Prast A.; Horgby Å.; Johnson M.S.; Kirk L.; Machado-Silva F.; Marzolf N.S.; McDowell M.J.; McDowell W.H.; Miettinen H.; Ojala A.K.; Peter H.; Pumpanen J.; Ran L.; Riveros-Iregui D.A.; Santos I.R.; Six J.; Stanley E.H.; Wallin M.B.; White S.A.; Sponseller R.A.
发表日期	2021
ISSN	17520894
起始页码	289
结束页码	294
卷号	14 期号:5
英文摘要	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. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	carbon dioxide; carbon emission; estimation method; light availability; photosynthesis; shading; spatiotemporal analysis
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206898
作者单位	Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; School of Forest Resources and Conservation, University of Florida, Gainesville, FL, United States; University of Cuiabá, Cuiabá, Brazil; Centre for Ecology and Hydrology, Bush Estate, Penicuik, United Kingdom; Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland; Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT, Australia; Biogas Research Center and Department of Thematic Studies–Environmental Change, Linköping University, Linköping, Sweden; Post-Graduate Program in Geosciences (Environmental Geochemistry), Chemistry Institute, Fluminense Federal University, Niterói, Brazil; Institute for Resources, Environment and Sustainability, University of British Columbia, Vancouver, BC, Canada; ...
推荐引用方式 GB/T 7714	Gómez-Gener L.,Rocher-Ros G.,Battin T.,et al. Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions[J],2021,14(5).
APA	Gómez-Gener L..,Rocher-Ros G..,Battin T..,Cohen M.J..,Dalmagro H.J..,...&Sponseller R.A..(2021).Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions.Nature Geoscience,14(5).
MLA	Gómez-Gener L.,et al."Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions".Nature Geoscience 14.5(2021).