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. 2021 Jan 13;11:1208. doi: 10.1038/s41598-020-79738-5

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Ice core stratigraphy. (a) Visual stratigraphy of drilled ice core under transmitted light: below each section the total length of the single run is reported, from the top (upper left) to the bottom run (lower right). (b) Thin sections of the bottom part of the core with ice facies; on the left, the single polarizer images which highlight the air bubble size and density; on the right, crossed polarization filters which show ice crystal structure and size, and crystal boundaries. The sections correspond from left to right to DNA metabarcoding samples P1 to P6.