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. 2020 Sep 1;4(9):e2020GH000277. doi: 10.1029/2020GH000277

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©2020. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Atmospheric pressure anomaly over Europe. The CG ice core site (4,450 m.a.s.l.) is shown as a star. A mean sea level pressure difference map was calculated for September 1918 from an average for the 1900–1930 interval in the ECMWF ERA‐20C reanalysis data set via the Climate Reanalyzer^™. A strong Iceland low pressure system influenced unusually cold and wet climate conditions during the month of September 1918.