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. 2020 Jul 16;10:11854. doi: 10.1038/s41598-020-68863-w

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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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Scatterplots of the DOC (a) and DON (b) concentrations against salinity in July and September 2015. The blue- and red-dotted lines indicate regression lines for each sampling cruise. The black-dotted lines indicate the theoretical mixing line of the end-members between seawater with the highest salinity and the Changjiang River water derived from previous studies (156 μM for DOC²⁹ and 20 μM for DON⁴²). The Pearson correlation analysis was conducted using SigmaPlot Version 12.0 (Systat Software, CA) (www.systatsoftware.com).