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. 2022 Aug 10;608(7923):546–551. doi: 10.1038/s41586-022-05093-2

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© The Author(s) 2022

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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Extended Data Fig. 3 — Blue lines show regression of mean daily July air temperature on elevation by year (2012-2019) in northwest Alaska. Dotted lines give fixed effects slope and intercept of linear mixed effects model (year as random factor) of temperature on elevation at four weather stations: “Kotz” is Kotzebue airport and three remote automated weather stations (RAWS) within 250 km of Kotz are as follows: “Salm” is Salmon, “Kalu” is Kaluich, and “Imel” is Imelyak. The vertical dashed line at AOI is located at 460 m asl, the elevation of the oldest aged colonist in the AOI. Numbers on bottom axis give elevations of weather stations named on top axis. Mean (± se) July lapse rate is −4.99 (± 0.26) ºC km⁻¹ (SI Calc. 7.2). Correlations of temperature from Kotzebue with temperatures from Salmon, Kaluich, and Imelyak RAWS were 0.967, 0.962, and 0.973 respectively (SI Calc. 7.1).