Articles | Volume 22, issue 8
https://doi.org/10.5194/bg-22-1947-2025
https://doi.org/10.5194/bg-22-1947-2025
Research article
 | 
23 Apr 2025
Research article |  | 23 Apr 2025

Anomalous summertime CO2 sink in the subpolar Southern Ocean promoted by early 2021 sea ice retreat

Kirtana Naëck, Jacqueline Boutin, Sebastiaan Swart, Marcel du Plessis, Liliane Merlivat, Laurence Beaumont, Antonio Lourenco, Francesco d'Ovidio, Louise Rousselet, Brian Ward, and Jean-Baptiste Sallée

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Cited articles

Ardyna, M., Lacour, L., Sergi, S., d'Ovidio, F., Sallée, J.-B., Rembauville, M., Blain, S., Tagliabue, A., Schlitzer, R., Jeandel, C., Arrigo, K. R., and Claustre, H.: Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean, Nat. Commun., 10, 2451, https://doi.org/10.1038/s41467-019-09973-6, 2019. 
Blain, S., Sarthou, G., and Laan, P.: Distribution of dissolved iron during the natural iron-fertilization experiment KEOPS (Kerguelen Plateau, Southern Ocean), Deep-Sea Res. Pt. II, 55, 594–605, https://doi.org/10.1016/j.dsr2.2007.12.028, 2008. 
Boutin, J., Merlivat, L., HÉnocq, C., Martin, N., and SallÉe, J. B.: Air–sea CO2 flux variability in frontal regions of the Southern Ocean from CARbon Interface OCean Atmosphere drifters, Limnol. Oceanogr., 53, 2062–2079, https://doi.org/10.4319/lo.2008.53.5_part_2.2062, 2008. 
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Short summary
In summer 2022, a CARbon Interface OCean Atmosphere (CARIOCA) drifting buoy observed an anomalously strong ocean carbon sink in the subpolar Southern Ocean associated with large plumes of chlorophyll a. Lagrangian backward trajectories indicate that these waters originated from the sea ice edge in spring 2021. Our study highlights the northward migration of the CO2 sink associated with early sea ice retreat.
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