A Fog Uptake Mechanism of Air Pollutant in Northern Japan
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概要
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Fog water was collected at the mountainside of Hachimantai range in Northern Japan from June to September in 1998 and 1999. The various ion concentrations in these samples were analyzed, and the fog droplet sizes were measured for each fog event. As the fog droplet size increased, the ion concentration decreased, and the slope of log-log plots of the concentration versus the droplet size was different each other. In order to characterize the air pollutant, moreover, these data were quantitatively analyzed by an oblique rotational factor analysis. We found that three factors were extracted as the air pollutant source; A: (NH<SUB>4</SUB>) <SUB>2</SUB>SO<SUB>4</SUB>, B: acids (HNO<SUB>3</SUB>+H<SUB>2</SUB>SO<SUB>4</SUB>), C: sea-salt. Combining the factor analysis with the 72 h back trajectory at 850 hPa level, we found that the contribution of each factor varies with the back trajectory. In 1998, the contribution of factor A tends to increase at the trajectories from Northeastern China, while factor C increases at the trajectories through the East China Sea and the Sea of Japan.
- 日本素材物性学会の論文
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