1996 Volume 31 Issue 6 Pages 292-302
Fog water had been sampled on Mt. Akagi almost every fall since 1984 till 1992. Chemical species in fog water have been analyzed. Weather conditions under which fog water was sampled were classified into 5 patterns of weather map. To clarify the relationship between weather condition and pollution of sampled water, 2 kinds of cluster analysis were performed by using the nondimensional chemical equivalent concentration normalized by averaged value, and the ratio of 9 chemical species concentration in fog and rain water.
As a result, the former dendrogram showed that samples were distinguished to high, middle and low groups of total ion concentration contained, the latter was dominated by contents of sea salt in sample. Both results corresponded with weather patterns categorized in this study.
The equivalent N/S (NO3-/ nss-SO42-) ratio in fog and rain water was larger than that of averaged in precipitations sampled in the whole Japan. Especially, the N/S ratio of fog water was considerably large, and varied by weather conditions.
