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Comparison of Arctic and Southern Ocean sea ice between the last nine interglacials and the future

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Abstract

Understanding the sea ice variability and the mechanisms involved during warm periods of the Earth is essential for a better understanding of the sea ice changes at the present and in the future. Based on simulations with the model LOVECLIM, this study investigates the sea ice variations during the last nine interglacials and focuses on the inter-comparison between interglacials as well as their differences from the present and future. Our results show that the annual mean Arctic sea ice variation is primarily controlled by local summer insolation, while the annual mean Southern Ocean sea ice variation is more influenced by the CO2 concentration but the effect of local summer insolation can’t be ignored. The lowest Arctic sea ice area results from the highest summer insolation at MIS-15, and the lowest Southern Ocean sea ice area at MIS-9 is explained by the highest CO2 concentration and moderate local summer insolation. As compared to the present, the last nine interglacials all have much less sea ice in the Arctic annually and seasonally due to high summer insolation. They also have much less Arctic sea ice in summer than the double CO2 experiment, which makes to some degree the interglacials possible analogues for the future in terms of the changes of sea ice. However, compared to the double CO2 experiment, the interglacials all have much more sea ice in the Southern Ocean due to their much lower CO2 concentration, which suggests the inappropriateness of considering the interglacials as analogues for the future in the Southern Ocean. Our results suggest that in the search for potential analogues of the present and future climate, the seasonal and regional climate variations should be considered.

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Acknowledgements

This work is supported by the Fonds de la Recherche Scientifique-FNRS (F.R.S.-FNRS) under grant MIS F.4529.18 and the National Natural Science Foundation of China (Grant Nos. 41888101 and 41690114). Q.Z. Yin is Research Associate F.R.S.-FNRS. Z.P. Wu thanks Dr. Yurun Tian, Ning Tan and François Massonnet for discussion. We also thank the anonymous reviewers for their constructive comments. Computational resources have been provided by the supercomputing facilities of the Université catholique de Louvain (CISM/UCL) and the Consortium des Équipements de Calcul Intensif en Fédération Wallonie Bruxelles (CÉCI) funded by the Fond de la Recherche Scientifique de Belgique (F.R.S.-FNRS) under convention 2.5020.11. We are grateful to all modeling centers for carrying out CMIP6 simulations used here.

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Correspondence to Zhipeng Wu or Qiuzhen Yin.

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Wu, Z., Yin, Q., Guo, Z. et al. Comparison of Arctic and Southern Ocean sea ice between the last nine interglacials and the future. Clim Dyn 59, 519–529 (2022). https://doi.org/10.1007/s00382-022-06140-4

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  • DOI: https://doi.org/10.1007/s00382-022-06140-4

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