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. 2019 Dec 2;10:5497. doi: 10.1038/s41467-019-13320-0

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© The Author(s) 2019

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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Fig. 2 — Methane accumulation in the water column. Panel a shows the in situ methane concentration [nmol l⁻¹] recorded weekly in 2016 in the South basin (53°08'36.6''N 13°01'42.8''E). Increasing concentration indicates accumulation. Panel b shows the methane concentration [nmol l⁻¹] recorded weekly in 2016 in the Northeast basin (53°09'20.2''N 13°01'51.5''E). Note, panel a contains an additional data point compared to panel b in the end of June. Panel c shows the methane profile in the open lake of the South basin (53°08'36.6''N 13°01'42.8''E; 20.5 m deep) as mean ± SD of 4 profiles taken on 4 different days in August 2014. Panel d shows the methane profile inside experimental enclosure 1 (53°08'36.4''N 13°01'41.6''E; ca. 20 m deep) as mean ± SD of 4 profiles taken on 4 different days in August 2014. Panel e illustrates the methane profile inside the central enclosure (53°08'35.8''N 13°01'41.1''E; ca. 18.5 m deep) as mean ± SD of methodological duplicate measurement taken on 7^th July 2016. Source data are provided as a Source Data file.