Fig. 4: Isotopic correlations between different carbon pools. | Nature Communications

Fig. 4: Isotopic correlations between different carbon pools.

From: Dissolved black carbon is not likely a significant refractory organic carbon pool in rivers and oceans

Fig. 4: Isotopic correlations between different carbon pools.

a DOC Δ14C vs. SPE-DOC Δ14C (n = 38), b DOC Δ14C vs. DBC Δ14C (n = 40), c SPE-DOC Δ14C vs. DBC Δ14C (n = 38); and d DOC δ13C vs. SPE-DOC δ13C (n = 39), e DOC δ13C vs. DBC δ13C (n = 40), and f SPE-DOC δ13C vs. DBC δ13C (n = 39) for the river, coastal and ocean samples (DOC dissolved organic carbon, SPE-DOC solid phase extracted dissolved organic carbon, DBC dissolved black carbon). The points with error bars are the average values of duplicate measurements and the error bars represent the range of the measured values. The statistics are for the regression of all data points. The gray areas show the 95% confidence interval of the linear regression. We applied one-sided F test and two-sided t test, and the calculated p values as shown.

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