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. 2020 Feb 24;10:3274. doi: 10.1038/s41598-020-60023-4

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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 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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(a) Seawater pH_(T) and sea temperature (°C) from 42-day deployment of the SeaFET at Portobello Marine Lab (PML) Wharf, Otago Harbour at 1 m depth. (b) Seawater pH and PAR (photosynthetically active radiation, 700–400 nm) light time series at PML from 9 to 11 May 2015. (c) Seawater pH and tidal height time series at PML from 9 to 11 May 2015. The pH (Internal) and pH (External) are the internal and external reference electrode measurements, respectively, which are equivalent when the instrument is correctly calibrated for accurate measurement.