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. 2018 Sep 3;9:3564. doi: 10.1038/s41467-018-06017-3

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© The Author(s) 2018

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. 8 — Zonal-mean north polar temperatures for three REGMAP data sets showing the warming of the polar stratosphere. Temperatures are displayed at six pressure levels: a 0.5 mbar, b 1.1 mbar, c 2.5 mbar, d 5.0 mbar, e 11 mbar, and f 110 mbar. Three dates are included in each panel: August 17 2013 (black, REGMAP 196_–001), June 25 2014 (blue, REGMAP 205_–001), and February 12 2017 (red, REGMAP 261_–003). Vertical dotted lines show the locations of prograde jet peaks⁹ for comparison with the meridional temperature gradients. Error bars represent the formal retrieval uncertainty. Note that the June 2014 data set utilised 15-cm⁻¹ resolution spectra, whereas the 2013 and 2017 data sets are better constrained by 2.5-cm⁻¹ resolution spectra