Figure 2: Nature Communications

Fig. 2

From: Increased ionization supports growth of aerosols into cloud condensation nuclei

Fig. 2

Experimental growth profiles. a Aerosol number density N tot ( d , t ) 1 T 0 T N tot d , t d t , normalized by the average of 97 cycles of 4 h (T = 388 h), as a function of diameter d and time t. b Data superposed over the 4 h period. The time t 1(d) (or t 2(d)) that the profile 1 (or profile 2) reaches d is determined by the local maximum of a Gaussian fit to (dN tot(d, t)/dt)2 (See Methods for details on derivation of the equations, the interaction coefficients, details of the experiment, and the (m ion/m 0) of 2.25.). Note that profile 1 (profile 2) is initially growing with γ-on (γ-off) until d ≈ 13 nm. However when d > 13 nm profile 1 (profile 2) grows with γ-off (γ-on). It is the difference in timing of profile 1 and 2 that contain information about the effect of ions on the growth rate