ON THE NUCLEATION PROCESSES OF ICE CRYSTAL AND THE COLLISION EFFI-CIENCY BETWEEN THE DENDRITIC SNOW CRYSTAL AND DROPLETS IN NATURAL CLOUDS

A study on the structure of snow crystal center (crystal with frozen droplet center or with crystal germ center) was conducted from the snow crystal data collected in five snow events. The relative importance of freezing nucleation and deposition nucleation in natural clouds have been discussed.