Abstract
A cloud simulation chamber facility run by the Meteorological Research Institute (MRI) has been used to investigate the details of the fundamental processes of cloud formation. To overcome the current lack of understanding on aerosol-cloud-precipitation interactions and to reduce the uncertainty in the estimation of aerosol indirect effects, we are attempting to evaluate CCN/IN abilities of various types of specific aerosol particles so as to link aerosol particles and cloud particles from the experimental approaches. In this report, the laboratory studies on the assessments of hygroscopic seeding and glaciogenic seeding materials at MRI are introduced. We tested two prospective techniques for delivering the salt particles that can be applied to warm-based clouds using airborne platform; salt micro-powder and pyrotechnic (flare) methods. We also investigated a widely-used delivery technique of silver iodide particles from the ground-based smoke generator into supercooled clouds, changing dissolving agent and hygroscopic substances in AgI acetone solutions to improve CCN and IN abilities.
