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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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NRSYON: observed atmospheric CO₂ and seawater carbon chemistry values from 2009 to 2019. (a) Atmospheric CO₂ concentrations at the Cape Ferguson greenhouse gas monitoring station. (b) To (g): dissolved inorganic carbon (DIC), total alkalinity (A_T), temperature and salinity (all measured); fCO₂ and pH (calculated). Points are depth-averaged monthly seawater samples; red points indicate summer (November–April); black are winter (May–October). In (b,c), the thin grey lines show the four sampling depths (0, 10, 20, 26 m). Straight solid blue lines are the linear trends, dashed blue lines are horizontal guides. Also shown are slopes of daily averaged data, unadjusted for changes in temperature and salinity.