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Dissolved H2 concentrations (nmol l−1) between depths of 5–125 m in the North Pacific Ocean. For each sampling occasion, seawater samples were collected at 1300 h. The theoretical value of dissolved H2 concentrations in seawater at atmospheric equilibrium (with an atmospheric concentration of 0.5 ppmv) is represented by the dashed line. Error bars where shown represent standard deviation (n = 3).
