The role of Antarctic sea ice in the Earth system: Perspectives informed by 130,000 years of sea ice records [preprint]

Chase, ﻿Zanna; Kohfeld, Karen E.; Leventer, Amy; Lund, David; Crosta, Xavier; Menviel, Laurie; Bostock, Helen C.; Chadwick, Matthew; Jaccard, Samuel L.; Jones, Jacob; Marzocchi, Alice; Meissner, Katrin J.; Sikes, Elisabeth; Sime, Louise C.; Skinner, Luke

The role of Antarctic sea ice in the Earth system: Perspectives informed by 130,000 years of sea ice records [preprint]

Chase, Zanna ORCID: https://orcid.org/0000-0001-5060-779X; Kohfeld, Karen E. ORCID: https://orcid.org/0000-0001-7241-1624; Leventer, Amy ORCID: https://orcid.org/0000-0001-9401-0987; Lund, David; Crosta, Xavier; Menviel, Laurie ORCID: https://orcid.org/0000-0002-5068-1591; Bostock, Helen C.; Chadwick, Matthew ORCID: https://orcid.org/0000-0002-3861-4564; Jaccard, Samuel L. ORCID: https://orcid.org/0000-0002-5793-0896; Jones, Jacob; Marzocchi, Alice ORCID: https://orcid.org/0000-0002-3430-3574; Meissner, Katrin J. ORCID: https://orcid.org/0000-0002-0716-7415; Sikes, Elisabeth; Sime, Louise C. ORCID: https://orcid.org/0000-0002-9093-7926; Skinner, Luke. 2025 The role of Antarctic sea ice in the Earth system: Perspectives informed by 130,000 years of sea ice records [preprint]. Climate of the Past [in review]. 57, pp. 10.5194/egusphere-2025-3504

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Official URL: https://egusphere.copernicus.org/preprints/2025/eg...

Abstract/Summary

Antarctic sea-ice cover reached historically low levels in 2023, consistent with the simulated decrease in sea-ice extent in response to anthropogenic warming. Antarctic sea ice is closely linked to multiple components of the Earth system, thus its demise could precipitate widespread, cascading changes across the cryosphere, atmosphere, and ocean. However, the nature and strength of these interconnections are poorly understood, and they are often inadequately represented in models. In this review paper we use modern observations, models and paleoclimate archives covering the last glacial cycle to gain insights into how reductions in sea ice may affect other components of the Earth system. We review how Antarctic sea ice interacts with ocean and atmosphere circulation, ice sheets and ice shelves, marine productivity, and the carbon cycle over the last glacial cycle, for which we have the most robust sea-ice reconstructions. The review finds strong evidence from theory and models for impacts of Antarctic sea ice on the Earth system. Paleo-proxy reconstructions provide examples where changes in sea ice co-occur with changes in the carbon cycle, marine productivity, and ocean circulation. However, challenges remain in isolating the impact of sea ice in a highly interconnected system.

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.5194/egusphere-2025-3504

NORA Subject Terms:

Glaciology
Marine Sciences
Meteorology and Climatology
Atmospheric Sciences

Date made live:

01 Sep 2025 13:43 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/540024