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. 2018 Jul 24;8:11146. doi: 10.1038/s41598-018-29286-w

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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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Trends of daily mean moisture variables. Similar format as Fig. 1 with three columns, each for a different time period. (a) Trends in seasonal (JJA) averages of daily mean dew point (Td). (b) Trends in seasonal averages of daily maximum Td in ERA-20C data. (c) Trends in the standard deviation of ERA-20C ensemble seasonal means of Td. The color scales for (a–c) are K/decade. (d) Specific humidity trends in 20CRv2 and (e) corresponding trend in standard deviation among ensemble members where the color scale shows the change per decade of gm water vapor per kg of air.