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. 2021 May 24;12:3060. doi: 10.1038/s41467-021-23135-7

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© The Author(s) 2021

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. 5 — a Nitrate (NO₃⁻) and soluble reactive phosphorus (SRP) flux from all stations of the 13 CAMREX cruises⁸³ (1982 to 1991) are highly correlated with river discharge. These stations are within a 2000 km reach of the Brazilian Amazon River mainstream. Solid lines mark the power law regression lines. b NO₃⁻ flux at Obidos from the HYBAM database¹⁰⁰ is also correlated with discharge, and the correlation is higher if data are binned to different discharge groups. c NO₃⁻ flux at Obidos from the same HYBAM dataset shows apparent increases in recent years. The recent mean monthly Sargassum areal coverages obtained from Wang et al. (2019) in the Central West Atlantic (CWA, 0^oN to 22^oN, 63^oW to 38^oW) are also shown as reference. All months before 2011 show Sargassum coverages. The shaded gray bars indicate when quality controlled HYBAM nutrient flux measurements are available, but data in some months are too low (<0.1 mg/L) to be visible due to the scale.