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. 2015 Nov 25;3:66. doi: 10.3389/fchem.2015.00066

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Copyright © 2015 Wagner, Jaffé, Cawley, Dittmar and Stubbins.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Molecular mass (first column), H/C ratio (second column) and modified aromaticity index (AI-mod; third column) distributions of formulae associated with optical properties. Plots (A–C) show the distributions of formulae which positively correlated with PARAFAC components. Plots (D–F) show the distributions for optical properties which track with allochthonous or terrestrial-type DOM (formulae positively correlated with SUVA₂₅₄, HIX and formulae negatively correlated with S_275−295, S_350−400, and S_R). Plots (G–I) show the distributions for optical properties which track with autochthonous or microbial-type DOM (formulae positively correlated with FI, freshness index, S_275−295, S_350−400, and S_R).