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. 2019 Oct 23;5(10):eaax6535. doi: 10.1126/sciadv.aax6535

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — Possible proportions of RDOC in mPMA, DOC from 5-m-deep seawater, and DOC from 2500-m-deep seawater are constrained by their measured Δ¹⁴C values (horizontal solid lines), Δ¹⁴C uncertainties (±1 SD; dark gray shading), and conservation of mass to lie within the gray wedge. The fraction of RDOC in each reservoir (i.e., mPMA, 5 m of DOC, and 2500 m of DOC) has (i) a lower value that is bounded by the conservative mixing line between Δ¹⁴C measurements of DOC from 2500 m (−457‰) and DIC from 5 m (+19 to +43‰, y-axis intercept), denoted as the 2500-m DOC mixing line, and (ii) an upper value that is bounded by the mixing line between fossil DOC (assumed −1000‰) and DIC from 5 m, denoted as the fossil DOC mixing line.