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. 2020 Jul 1;10:10695. doi: 10.1038/s41598-020-66541-5

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© The Author(s) 2020

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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Yearly normalized averages of beryllium-7 data for 2009 and 2019 corrected from cosmic rays. The interpolation does not contain meteorological information and is only to help visualize the global increase of beryllium-7 concentration in the last 10 years. Interpolation is based on multilevel b-spline with cell grid size of 1 degree using beryllium-7 values from 62 IMS stations (green stars). Software used to produce Figure 7 QGIS Development Team (2019). QGIS Geographic Information System. Open Source Geospatial Foundation Project. http://qgis.osgeo.org.