Extended Data Fig. 1: Temporal F14Catm trends in river DIC, CO2 and CH4.
From: Old carbon routed from land to the atmosphere by global river systems
Fraction Modern values normalized to atmospheric 14CO2 in the year of sampling35 (F14Catm; Methods) over the available period of observations (1991–2023). The trend line, R2 and P-values are from linear regression across all data; the dashed horizontal line indicates F14Catm = 1.0, for which F14C content is in equilibrium with atmospheric 14CO2 in the year of sample collection. The density plot for the F14Catm values is shown above the main panel.
