Transition to a much warmer climate for the global ocean and Antarctic Ice Sheet coupled system, and its reversibility

To assess the response of the Southern Ocean and Antarctic ice sheet to an abrupt shift toward high-end atmospheric conditions typical of the late 23rd century under the SSP5-8.5 scenario—and to evaluate the reversibility of such changes—we conducted three coupled experiments in Mathiot et al. (2026, submitted) using an ocean/ice sheet model. Our reference experiment (REF) is driven by present-day atmospheric conditions. In the 23rd-century simulation (PERT), the present-day atmospheric forcing is perturbed by the anomaly derived from the difference between the 2260–2299 and 1975–2014 periods, extracted from monthly outputs of the IPSL-CM6A-LR projections under the SSP5-8.5 emission scenario. The reversibility experiment (REV) begins at the end date of PERT and is forced by the same present-day conditions as REF. Due to the long timescales of ice sheet dynamics, both REF and REV are extended using the ice sheet model alone, resulting in REFext and REVext. This dataset contains: notebooks used to make the figures and the figures (PLOT repository) discussed in the study simulation outputs used in the notebooks (DATA repository) source codes and parameter files used to run the simulations (CFGS repository) Reference paper: Transition to a much warmer climate for the global ocean and Antarctic Ice Sheet coupled system, and its reversibility by Pierre Mathiot et al. submitted to The Cryosphere. Acknowledgements: This study was funded by the European Union’s Horizon 2020 research and innovation programme under grant agreements No 820575 (TiPACCs) and No 101003536 (ESM2025), by the French National Research Agency under Grant ANR-19-CE01-0015 (EIS) and from the support of the French Government through the France 2030 program managed by ANR (ISClim, ANR-22-EXTR-0010). This work was granted access to the HPC resources of CINES and TGCC under allocations A0120106035 and A0140106035 attributed by GENCI.