Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions

Gómez-Gener, Lluís; Rocher-Ros, Gerard; Battin, Tom; Cohen, Matthew J.; Dalmagro, Higo J.; Dinsmore, Kerry J.; Drake, Travis W.; Duvert, Clément; Enrich-Prast, Alex; Horgby, Åsa; Johnson, Mark S.; Kirk, Lily; Machado-Silva, Fausto; Marzolf, Nicholas S.; McDowell, Mollie J.; McDowell, William H.; Miettinen, Heli; Ojala, Anne K.; Peter, Hannes; Pumpanen, Jukka; Ran, Lishan; Riveros-Iregui, Diego A.; Santos, Isaac R.; Six, Johan; Stanley, Emily H.; Wallin, Marcus B.; White, Shane A.; Sponseller, Ryan A.. 2021 Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions. Nature Geoscience, 14 (5). 289-294. https://doi.org/10.1038/s41561-021-00722-3

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Official URL: http://dx.doi.org/10.1038/s41561-021-00722-3

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1038/s41561-021-00722-3
UKCEH and CEH Sections/Science Areas:	Unaffiliated
ISSN:	1752-0894
Additional Information. Not used in RCUK Gateway to Research.:	Publisher link (see Related URLs) provides a read-only full-text copy of the published paper.
Additional Keywords:	carbon cycle, ecosystem ecology, limnology
NORA Subject Terms:	Ecology and Environment Atmospheric Sciences
Related URLs:	Publisher
Date made live:	04 Jun 2021 10:21 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530465

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1038/s41561-021-00722-3

UKCEH and CEH Sections/Science Areas:

Unaffiliated

ISSN:

1752-0894

Additional Information. Not used in RCUK Gateway to Research.:

Publisher link (see Related URLs) provides a read-only full-text copy of the published paper.

Additional Keywords:

carbon cycle, ecosystem ecology, limnology