Fig. 1: An example of ultrafine secondary marine aerosol (SMA) condensational growth event at MHD, 9th June 2012.

a The time series of aerosol number size distributions, the arrows represent the defined growth stages: start, middle, and end phases; the grey line represents linear regression of Aitken mode diameter against growth time; b the average aerosol number size distribution for different growth stages; c the particle mass size distribution of different species at various stages, the bars represent raw data, and the lines represent two modal lognormal distribution fitting, the fitted Aitken modal diameter were labelled for each panel; d the mass fraction of chemical species contributing to the growth of Aitken (left) and accumulation (right); e the averaged volume size distribution retrieved by SMPS (black dashed line) and HR-ToF-AMS (coloured area), the grey area represent 95th confidence interval of SMPS volume size distribution.