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. 2018 Jan 17;4(1):eaao4842. doi: 10.1126/sciadv.aao4842

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Copyright © 2018 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 — (A) Dissolved ¹⁴C-CH₄ data for stations 1 to 8, plotted by the water depth of the station. The data include lagoon samples (×), surface samples (white circles), and near-seafloor samples (black circles). Error bars that are not visible are smaller than the markers. Uncertainty for ¹⁴C-CH₄ data incorporates the collection, preparation, and measurement uncertainties (20). (B) A Keeling plot (Eq. 3) incorporating [CH₄] and ¹⁴C-CH₄ measurements from stations 1 to 8 suggests that the system can be viewed as a pseudo–two-component mixture and that the ¹⁴C-CH₄ source signature (¹⁴C_s) likely ranges from 0 to 5.62 pMC.