抄録
Aerosol and cloud in the free troposphere play an important role in the climate change. We provide the information, in this paper, on the physical and chemical properties of atmospheric aerosol in high mountain region at Mt. Tateyama area with respect to their temporal and spatial variability. This area is located in the center of Honshu island, Japan, near the Toyama bay on the coast of the Sea of Japan. We conducted the measurements of the chemical composition of fog waters as well as other related observations in the Mt. Tateyama area in autumn. It was found that the acidic fog observed at Murododaira (2,450 m) was not mainly due to nitrate but sulfate suggesting the remote source of the acidic matter. Also conducted was the analysis of snow layer sampled from Murododaira since 1970's. The piled layers of snow exhibit the chronology of transport and deposition of acidic matters, Asian dust and other pollutants from the continent to the Toyama area. Furthermore, we measured the aerosol optical properties by using a sky radiometer in the city of Toyama and Mt. Jodo (2,847 m). These measurements revealed that the aerosol optical thickness has a significant vertical variability at the top of the mountain.
