Drivers of Antarctic sea ice advance

Himmich, K.; Vancoppenolle, M.; Madec, G.; Sallée, J-B.; Holland, P.R. ORCID: https://orcid.org/0000-0001-8370-289X; Lebrun, M.. 2023 Drivers of Antarctic sea ice advance. Nature Communications, 14, 6219. 9, pp. 10.1038/s41467-023-41962-8

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Text (Open Access) © The Author(s) 2023 Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. s41467-023-41962-8.pdf - Published Version Available under License Creative Commons Attribution 4.0. Download (10MB) | Preview

Abstract/Summary

Antarctic sea ice is mostly seasonal. While changes in sea ice seasonality have been observed in recent decades, the lack of process understanding remains a key challenge to interpret these changes. To address this knowledge gap, we investigate the processes driving the ice season onset, known as sea ice advance, using remote sensing and in situ observations. Here, we find that seawater freezing predominantly drives advance in the inner seasonal ice zone. By contrast, in an outer band a few degrees wide, advance is due to the import of drifting ice into warmer waters. We show that advance dates are strongly related to the heat stored in the summer ocean mixed layer. This heat is controlled by the timing of sea ice retreat, explaining the tight link between retreat and advance dates. Such a thermodynamic linkage strongly constrains the climatology and interannual variations, albeit with less influence on the latter.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1038/s41467-023-41962-8
ISSN:	20411723
Date made live:	20 Oct 2023 09:15 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/536136

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