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. 2018 Mar 22;8:4666. doi: 10.1038/s41598-018-22939-w

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© The Author(s) 2018

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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Numerical model calibration. (a) The GPGP boundary (blue line) is estimated by comparing microplastic concentration measurements (circles) to model particle visit averages that accounted for seasonal and inter-annual variations. This map was created using QGIS version 2.18.1 (www.qgis.org). (b) Model validation showing median measured mass concentration for microplastics of stations outside and inside our predicted 1 kg km⁻² GPGP boundary. Bars extend from 25^th to 75^th percentile while whiskers extend to minimum and maximum non-outlier. Outliers are represented as crosses. (c) Measured mass concentrations versus modelled mass concentrations for microplastics, mesoplastics, macroplastics and megaplastics. (d) Same as (c) but with numerical concentrations.