Abstract
Acid fog and pollution have been observed on Mt. Akagi almost every fall since 1984. In this study, we considered the transportation process of air pollutants from the Kanto plain to Mt. Akagi, based on the fog and air pollution data obtained from field experiments conducted in September 20-28 in 1990. It was found that fog developed on Mt. Akagi shows very high NO3-/SO42- ratio compared with those of ordinary deposition in Japan. The behaviour of air pollution on Mt. Akagi can not be explained only by the air pollution and wind condition near the ground surface in the Kanto plain. Therefore, a 3-dimensional wind field was estimated by the variational procedure, and the transportation process of particles released from central area of Tokyo Metropolitan was visualized.
Typical transport pattern of air pollutants from the Kanto plain to mountaneous area became clear. The transportation process of high concentration of ozone observed on Mt. Akagi in the evening became definite. Especially, it could be explained that the high ozone concentration in the evening of September 24th occured by the accumulation of air pollutants by the stagnation of air mass over the Kanto plain.
