Articles | Volume 18, issue 3
https://doi.org/10.5194/cp-18-507-2022
https://doi.org/10.5194/cp-18-507-2022
Research article
 | 
16 Mar 2022
Research article |  | 16 Mar 2022

Marine carbon cycle response to a warmer Southern Ocean: the case of the last interglacial

Dipayan Choudhury, Laurie Menviel, Katrin J. Meissner, Nicholas K. H. Yeung, Matthew Chamberlain, and Tilo Ziehn

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We investigate the effects of a warmer climate from the Earth's paleoclimate (last interglacial) on the marine carbon cycle of the Southern Ocean using a carbon-cycle-enabled state-of-the-art climate model. We find a 150 % increase in CO2 outgassing during this period, which results from competition between higher sea surface temperatures and weaker oceanic circulation. From this we unequivocally infer that the carbon uptake by the Southern Ocean will reduce under a future warming scenario.