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. 2018 Aug 17;8:12375. doi: 10.1038/s41598-018-30812-z

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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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The amplitudes of the Fourier components, up to n = 24, of monthly meridional velocity at 300 hPa and the longitudinal distributions of monthly H₃₀₀ for Aprils of the years of 1980, 1983, 2012 and 2016, based on respective NCEP-NCAR reanalysis data¹³. Panels (a) and (b) demonstrate a dominance of wave-4 Fourier component over all other Fourier components of the meridional velocity averaged, respectively, over 50N–60N and 45N–70N, while panels (c) and (d) show the longitudinal distribution of H₃₀₀ averaged over the same latitudinal ranges 50N–60N (c) and 45N–70N (d), with one of the maxima reached over western Canada.