Abstract
In order to compare the theory or the parameterization of cloud physics and the phenomena occuring really in clouds, we have constructed the experimental facilities with quasi-prototype scale using a vertical long shaft in a mine, and some valuable data such as updraft velocity, temperature, mixing ratio of vapor, cloud particles and rain drops, aerosol and their vertical distribution have been observed. In this shaft it was found that cloud occurred even in the lower condition than saturation point of humidity. The vertical distributions of temperature consists of two descending linear lines, which correspond to the dry and moist adiabatic lapse rate each other. This indicates the release of latent heat at the phase change from vapor to cloud water. Through the experiments, we found the new type of mechanism related to the occurrence of clouds. Finally we compared the above experimental results with the numerical solutions using the model of micro cloud physics proposed by Steven and Hobbs (1983), and we confirmed that this model can explain the experimental results by a slight modification for a condensation term.
