Extended Data Fig. 6: Susceptibility of cloud albedo to CDNC perturbations in continental and ocean-based stratiform clouds.

The solid black line (forced through the origin) shows a least-squares fit to cloud albedo (A) susceptibility in the studied pollution tracks. The dashed black line shows the slope of the one-third contribution expected from just the Twomey effect, assuming a constant LWP. Fractional changes in the LWP for individual tracks are given in colour. a, For land-based industry and fire tracks the slope of the fitted solid black line is 0.27, implying that the relative increase in cloud albedo is less than that expected from only the Twomey effect. b, For ocean-based volcano and ship tracks the slope of the fitted solid black line is 0.32, implying that the relative increase in cloud albedo is very similar to that expected from only the Twomey effect.