Rodgers K. B. auteur aut IRD Schlunegger S. auteur aut IRD Slater R. D. auteur aut IRD Ishii M. auteur aut IRD Frolicher T. L. auteur aut IRD Toyama K. auteur aut IRD Plancherel Y. auteur aut IRD Aumont Olivier auteur aut IRD Fassbender A. J. auteur aut IRD text journalArticle eng text/pdf reformatted digital access A positive marine chemistry-climate feedback was originally proposed by Revelle and Suess (1957, ), whereby the invasion flux of anthropogenic carbon into the ocean serves to inhibit future marine CO(2)uptake through reductions to the buffering capacity of surface seawater. Here we use an ocean circulation-carbon cycle model to identify an upper limit on the impact of reemergence of anthropogenic carbon into the ocean's mixed layer on the cumulative airborne fraction of CO(2)in the atmosphere. We find under an RCP8.5 emissions pathway (with steady circulation) that the cumulative airborne fraction of CO(2)has a sevenfold reduction by 2100 when the CO(2)buffering capacity of surface seawater is maintained at preindustrial levels. Our results indicate that the effect of reemergence of anthropogenic carbon into the mixed layer on the buffering capacity of CO(2)amplifies the transient climate sensitivity of the Earth system. specialized ocean feedback carbon cycle modeling 032 021 020 47 18 e2020GL089275 [9 ] 2020 0094-8276 https://www.documentation.ird.fr/hor/fdi:010079805 10.1029/2020gl089275 0094-8276 [F B010079805] https://www.documentation.ird.fr/hor/fdi:010079805 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-10/010079805.pdf IRD - Base Horizon / Pleins textes 2020-11-12 2025-02-24 fdi:010079805 fre