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Carbon dioxide fluxes increase from day to night across European streams.

Attermeyer, K., Casas-Ruiz, J.P., Fuss, T., Pastor, A., Cauvy-Fraunié, S., Sheath, D., Nydahl, A.C., Doretto, A., Portela, A.P., Doyle, B.C., Simov, N., Roberts, C.G., Niedrist, G.H., Timoner, X., Evtimova, V., Barral-Fraga, L., Basic, T., Audet, J., Deininger, A., Busst, G., Fenoglio, S., Catalán, N., de Eyto, E., Pilotto, F., Mor, J-R., Monteiro, J., Fletcher, D., Noss, C., Colls, M., Nagler, M., Liu, L., González-Quijano, C.R., Romero, F., Pansch, N., Ledesma, J.L.J., Pegg, J., Klaus, M., Freixa, A., Ortega, S.H., Mendoza-Lera, C., Bednařík, A., Fonvielle, J.A., Gilbert, P.J., Kenderov, L.A., Rulík, M. and Bodmer, P., 2021. Carbon dioxide fluxes increase from day to night across European streams. Communications Earth & Environment, 2 (1), 118.

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DOI: 10.1038/s43247-021-00192-w

Abstract

Globally, inland waters emit over 2 Pg of carbon per year as carbon dioxide, of which the majority originates from streams and rivers. Despite the global significance of fluvial carbon dioxide emissions, little is known about their diel dynamics. Here we present a large-scale assessment of day- and night-time carbon dioxide fluxes at the water-air interface across 34 European streams. We directly measured fluxes four times between October 2016 and July 2017 using drifting chambers. Median fluxes are 1.4 and 2.1 mmol m−2 h−1 at midday and midnight, respectively, with night fluxes exceeding those during the day by 39%. We attribute diel carbon dioxide flux variability mainly to changes in the water partial pressure of carbon dioxide. However, no consistent drivers could be identified across sites. Our findings highlight widespread day-night changes in fluvial carbon dioxide fluxes and suggest that the time of day greatly influences measured carbon dioxide fluxes across European streams.

Item Type:Article
ISSN:2662-4435
Uncontrolled Keywords:Carbon cycle; Environmental chemistry; Limnology
Group:Faculty of Science & Technology
ID Code:35763
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:12 Jul 2021 14:10
Last Modified:12 Jul 2021 14:10

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