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Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions
Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.ORCID iD: 0000-0001-7853-2531
Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
School of Forest Resources and Conservation, University of Florida, FL, Gainesville, United States.
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2021 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 14, no 5, p. 289-294Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nature Publishing Group , 2021. Vol. 14, no 5, p. 289-294
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Oceanography, Hydrology and Water Resources Climate Research
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URN: urn:nbn:se:polar:diva-8846DOI: 10.1038/s41561-021-00722-3ISI: 000640456800002Scopus ID: 2-s2.0-85104783751OAI: oai:DiVA.org:polar-8846DiVA, id: diva2:1626054
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Swedish Research Council Formas, EF-1442439Available from: 2021-05-11 Created: 2022-01-10 Last updated: 2022-01-11Bibliographically approved

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