The average number concentration of CCN was about 2,300 cm-3 at a water supersaturation (SSw) of 0.5%. The CCN concentration showed the seasonal trends of higher in winter and lower in summer. The number concentration of IN was about 5 L-1 on average at a temperature of -25 C over the range of SSw from 0 to 5%. The IN concentration had a large variability with some trends of higher in late spring or early summer.
The median values of hygroscopicity of aerosols were 0.1 (SSw=1.0%) to 0.35 (SSw=0.1%). Their median of ice nucleation active site (INAS) density was on the order of 107 m-2 from -15 to -35 C with weak dependency of temperature. The results in this study will be compared with previous studies.