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. 2017 Dec 5;8:1947. doi: 10.1038/s41467-017-01907-4

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© The Author(s) 2017

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/.

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Fig. 1 — Impact of sea-ice physics parameter perturbations on Arctic and Antarctic sea-ice cover. a Arctic sea-ice concentrations, September. b Antarctic sea-ice concentrations, March. Shown are monthly mean sea-ice concentrations. Areas contained within contour lines have sea-ice fractions larger than 15%. Thick black lines denote control ensemble means, thick purple lines show “low Arctic ice” in a and “low Antarctic ice” ensemble means in b. Thin purple lines indicate individual “low Arctic ice” (“low Antarctic ice”) simulations. The colored shading indicates the average observed September (a) and March (b) sea-ice concentrations over the period 1992–2001 (from the Center for Satellite Exploitation and Research; http://nsidc.org/data/sipn/data-sets.html#seaice-conc-ext). A brief comparison of Arctic vs. Antarctic sea-ice changes is provided in Supplementary Note 1