Abstract
The mid-latitude climate responses to Arctic sea ice loss remain unclear, partly because the atmospheric responses depend sensitively to the location of sea ice anomalies. Evaluating the role of regional Arctic sea ice extent anomalies is therefore essential to appreciate the extent of atmospheric responses. We investigated these responses but also the atmospheric precursors to regional Arctic sea ice extent anomalies in long pre-industrial control simulations from 36 CMIP6 climate models. This study examines changes in various atmospheric variables at different lead and lag times by performing a composite analysis between years of low and high sea ice extents in different Arctic seas. Stronger and more statistically significant relationships are found when the atmosphere leads to changes in sea ice than in the reverse direction, suggesting that in the CMIP6 models the atmosphere drives the sea ice rather than the opposite. The atmospheric circulation is found to be relatively insensitive to regional sea ice anomalies except in the Barents–Kara (BAKA) Seas, where the negative anomalies are followed by a robust negative winter North Atlantic Oscillation (NAO)-like pattern. Consistent with the so-called stratospheric pathway, a weakening of the stratospheric polar vortex (SPV) is simulated 1 month prior to the NAO change and can be partially explained by the sea ice anomaly in BAKA in preceding months. The magnitude of this weakening in models depends on other factors, such as the Siberian snow cover, the El Niño–Southern oscillation, and the quasi-biennial oscillation. Moreover, the SPV and the NAO index responses scale approximately linearly with the magnitude of the BAKA sea ice anomaly. These results highlight the inter-model consistency of the role played by the BAKA sea ice extent anomaly for the atmospheric responses under pre-industrial conditions. In upcoming work, the sea ice loss in this region should therefore primarily be considered, but under future conditions.
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Data availability
The data from the CMIP6 models are openly available and can be found at: https://esgf-node.llnl.gov/search/cmip6/.
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Steve Delhaye is F.R.S-FNRS research fellow, Belgium (Grant no. 1.A119.20). François Massonnet is a F.R.S.-FNRS Research Associate. 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.
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SD, FM and TF conceptualized the science plan. SD performed the analyses with the help of FM, TF, RM, LT and JS. SD produced the figures and wrote the manuscript based on the insights from the co-authors.
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Delhaye, S., Massonnet, F., Fichefet, T. et al. Dominant role of early winter Barents–Kara sea ice extent anomalies in subsequent atmospheric circulation changes in CMIP6 models. Clim Dyn (2023). https://doi.org/10.1007/s00382-023-06904-6
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DOI: https://doi.org/10.1007/s00382-023-06904-6