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. 2020 Oct 27;10:18602. doi: 10.1038/s41598-020-75293-1

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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 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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Observed changes in atmospheric CO₂ concentrations at Mauna Loa monitoring station¹ (solid black line), and at GBRWIS since 2009 (a, blue line) and Cape Ferguson since 1991 (b, blue line; sourced from https://gaw.kishou.go.jp/search/station#CFA). Red lines: observed seawater fCO₂ and their linear fits at GBRWIS (a) and NRSYON (b). Grey dashed lines are back-projections of observed seawater fCO₂ envelopes. Also shown are slopes of the data prior to correction for variation in temperature, salinity, seasonality, and nutrients.