1954 Volume 32 Issue 11-12 Pages 345-353
It is conceivable that the volcanic eruption is one of the important sources which supply ice-forming nuclei and large condensation nuclei for the atmosphere.
We have found statistically that volcanic eruptions of Mt. Asama had a close relation to the precipitation in its neighbouring districts, and experiments showed that volcanic dust particles of this mountain were effective as ice-forming nuclei at temperatures below -14°C.
These statistical and experimental results show that volcanic dust particles are important nuclei in the atmosphere and increase the amount of precipitation.