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. 2017 Sep 28;8:731. doi: 10.1038/s41467-017-00820-0

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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. 5 — Attribution of western Ross Sea ice area trends to the October zonal winds trends. a Trends in gridded October zonal winds for 1979–2015 from ERA-Interim in the colored shading in units of m s^–1 per decade. Black contours indicate the correlation of the October zonal wind index and March western Ross Sea ice area (as also shown in Fig. 1d). b The two regions used for averaging the zonal wind anomalies. c The correlation of monthly western Ross Sea ice area and October zonal wind anomalies averaged for the two regions shown on b. d The fraction of the observed monthly trend in western Ross Sea ice area that is attributable to the October zonal wind trend averaged for the two regions. In c and d, the color of the line corresponds to the use of wind data that is averaged for the associated colored region in b