Fig. 2: Sensitivity analysis of the cloud parcel model predictions to changing sea-salt number concentration (SS) and updraft velocity (w), depending on nss-SO₄ concentration (N_sulfate).

Left axis shows CDNC (cm⁻³) in dashed lines while the right axis shows cloud peak supersaturation (S_peak%) in solid lines. All panels display sensitivity as a function of N_sulfate in log-scale. All simulations were initialised at a parcel temperature of 268.15 K, 98.5% relative humidity, and 920 hPa. Different sea-salt particle number concentrations (SS) are indicated on the graph. Line shade indicates changes in SS (from 1 to 160 sea-salt particles cm⁻³) for w = 0.1 m s⁻¹ (a), w = 0.3 m s⁻¹ (b), and for w = 0.5 m s⁻¹ (c). On all panels (a–c) the blue shaded region marks the range of N_sulfate measured in the eight steady-state cases from the Southern Ocean study.