Extended Data Fig. 2: Influence of catchment size on 14C in river DIC, CO2 and CH4.
From: Old carbon routed from land to the atmosphere by global river systems
Normalized F14Catm values for DIC, CO2 and CH4 separated by indicative size class on an exponential scale (that is, catchment size <10 km2, approximately 100 km2, approximately 1,000 km2 and so on; Methods). The horizontal black line represents the mean-normalized F14Catm for all samples, box and whisker dimensions follow Fig. 1b, lowercase letters indicate statistically significant differences (P < 0.05) using a Kruskal–Wallis test (P-value shown at the top) and Conover–Iman post hoc.
