![]() 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. 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. ![]() 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. However, these fluxes remain poorly constrained because of substantial spatial and temporal variability in dissolved CO 2 concentrations. Nature Geoscience volume 14, pages 289–294 ( 2021) Cite this articleĬarbon 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. ![]() Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions
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