Articles | Volume 19, issue 12
Research article
21 Jun 2022
Research article |  | 21 Jun 2022

Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected

Léa Olivier, Jacqueline Boutin, Gilles Reverdin, Nathalie Lefèvre, Peter Landschützer, Sabrina Speich, Johannes Karstensen, Matthieu Labaste, Christophe Noisel, Markus Ritschel, Tobias Steinhoff, and Rik Wanninkhof

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Cited articles

Aller, R. C. and Blair, N. E.: Carbon remineralization in the Amazon–Guianas tropical mobile mudbelt: A sedimentary incinerator, Cont. Shelf Res., 26, 2241–2259,, 2006. 
Andrié, C., Oudot, C., Genthon, C., and Merlivat, L.: CO2 fluxes in the tropical Atlantic during FOCAL cruises, J. Geophys. Res.-Oceans, 91, 11741–11755,, 1986. 
Aroucha, L. C., Veleda, D., Lopes, F. S., Tyaquiçã, P., Lefèvre, N., and Araujo, M.: Intra- and Inter-Annual Variability of North Brazil Current Rings Using Angular Momentum Eddy Detection and Tracking Algorithm: Observations From 1993 to 2016, J. Geophys. Res.-Oceans, 125, e2019JC015921,, 2020. 
Arrigo, K. R.: Marine manipulations, Nature, 450, 491–492,, 2007. 
Arruda, R., Atamanchuk, D., Cronin, M., Steinhoff, T., and Wallace, D. W. R.: At-sea intercomparison of three underway pCO2 systems, Limnol. Oceanogr.-Meth., 18, 63–76,, 2020. 
Short summary
We investigate the impact of the interactions between eddies and the Amazon River plume on the CO2 air–sea fluxes to better characterize the ocean carbon sink in winter 2020. The region is a strong CO2 sink, previously underestimated by a factor of 10 due to a lack of data and understanding of the processes responsible for the variability in ocean carbon parameters. The CO2 absorption is mainly driven by freshwater from the Amazon entrained by eddies and by the winter seasonal cooling.
Final-revised paper