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. 2018 Mar 2;8:3927. doi: 10.1038/s41598-018-22258-0

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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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(A) Variation in the relationship between rate of Northern Hemisphere springtime land surface warming and latitude among successively more recent decadal periods beginning in 1928, coinciding with the periods encompassed by the studies upon which estimates of phenological trends used in this analysis have been based. (B) The mean rate (heavy line) and upper- and lower 95% confidence limits (thin lines) of Northern Hemisphere springtime land surface warming calculated across all periods in panel (A).