Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions

Carbon dioxide (CO 2 ) 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 CO 2 concentrations. Using...

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Bibliographic Details
Published in:Nature geoscience Vol. 14; no. 5; pp. 289 - 294
Main Authors: 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.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01.05.2021
Nature Publishing Group
Subjects:
704/158/2445
704/286
704/47/4113
Atmosphere
Carbon dioxide
Carbon dioxide atmospheric concentrations
Carbon dioxide concentration
Carbon dioxide emissions
Carbon dioxide fixation
Carbon dioxide measurements
Carbon sequestration
Constraints
Earth and Environmental Science
Earth Sciences
Earth System Sciences
Efflux
Emission measurements
Emissions
Environmental Sciences
Fluxes
Geochemistry
Geologi
Geology
Geophysics/Geodesy
Miljövetenskap
Night
Nocturnal
Oceans
Photosynthesis
Plant cover
Rivers
Running waters
Shading
Temporal variability
Temporal variations
Water colour
ISSN:1752-0894, 1752-0908, 1752-0908
Online Access:Get full text
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Summary:Carbon dioxide (CO 2 ) 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 CO 2 concentrations. Using a global compilation of high-frequency CO 2 measurements, we demonstrate that nocturnal CO 2 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 CO 2 by photosynthesis. Because current global estimates of CO 2 emissions to the atmosphere from running waters (0.65–1.8 PgC yr −1 ) rely primarily on discrete measurements of dissolved CO 2 obtained during the day, they substantially underestimate the magnitude of this flux. Accounting for night-time CO 2 emissions may elevate global estimates from running waters to the atmosphere by 0.20–0.55 PgC yr −1 . Failing to account for emission differences between day and night will lead to an underestimate of global CO 2 emissions from rivers by up to 0.55 PgC yr –1 , according to analyses of high-frequency CO 2 measurements.
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content type line 14
ISSN:1752-0894
1752-0908
1752-0908
DOI:10.1038/s41561-021-00722-3