On the Hygroscopic Nuclei in the Cloud Droplets
1971 Volume 22 Issue 1 Pages 1-21
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1971 Volume 22 Issue 1 Pages 1-21
Applying the isopiestic m ethod to the mass determination of hygroscopic nuclei in cloud droplets, we found that the isopiestic method can produce a satisfactory result when a 10% NaCl solution is used as a vapor-pressure controlling solution.
We sampled the nuclei from layer-ty p e warm clouds at the 7.8 Gome (3,400 m) of Mt. Fuji during June 20th to 28th in 1967. We determined the nucleus mass by the isopiestic method for 1318 cloud droplets. The nucleus masses of the cloud droplets were almost the order of 10-14-10-12 gm, and the number of nuclei with weight over 8 × 10-14 gm (dtection limit)' was 27% of all the droplets. The relation between the size of the cloud droplet and the nucleus mass was not found in the early stage of droplet growth, but a high correlation was found in the later stage; that is, the larger droplets contain lamer hvzroscopic nuclei.
