A Laboratory Study on the Nucleating Properties of Three AgI–type Aerosols Under Water Sub–Saturation

Three kinds of AgI–type aerosols have been tested in a 2m3 isothermal cloud chamber under water sub–saturation conditions to study their ice nucleating properties. The possibility for contact nucleation is excluded in such a cloudless condition and whether there is the frozen droplet or not in the ice crystal center is taken as a sign to tell condensation freezing nucleation from deposition nucleation. The qualitative results obtained show that there are the obvious differences of three kins of AgI–type aerosols in their ice nucleating properties