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. 2018 Nov 9;8:16623. doi: 10.1038/s41598-018-35054-7

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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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Measurements of CH₄ (black) and CO₂ (green) concentrations in subglacial air expelled from one lateral subglacial meltwater discharge point at the Isunnguata Sermia glacier, West Greenland on (A) August 23^rd, (B) August 24^th, (C) August 25^th and (D) August 26^th 2016. Blue and red triangles mark the start and end of CH₄ and CO₂ measurements in the subglacial cave, respectively. For (B) is also shown timeseries of CH₄ concentrations measured in the air flowing through cracks in the ice next to the main lateral outlet. (see Fig. 3C for details). The red asterisk in (B) represent a closed chamber measurement (Fig. 3B) of the CH₄ exchange between meltwater and the atmosphere (insert graph). The CO₂ concentrations in the air is not shown due to contamination with human breadth resulting in highly fluctuating measurements of CO₂ in the air outside the cave. This was not the case for CH₄.