Abstract
Forest decline has been found in the Tanzawa Mountains and O3 is thought to be one of its causes. However, a three-dimensional analysis using numerical models has not been carried out in the Tanzawa Mountains. In this study, we carried out a study to understand the behavior of the O3 concentration in the Tanzawa Mountains using numerical models (the meteorological and air quality models). The surface O3 concentration in the mountains and its surrounding area did not depend on the model grid size of 15km and 5km. The diurnal variation in the surface O3 concentration in the Tanzawa Mountains is low, because the O3 chemical production is lower and the dry deposition is not lower than that around the air quality monitoring station in the daytime, and the sea breeze with fresh air does not reach the Tanzawa Mountains in the evening. The vertical O3 concentration increases with the elevation or is constant with the elevation in the ABL (Atmospheric Boundary Layer). The O3 concentration above the ABL immediately decreases with the elevation and reaches a background concentration (50ppb). The numerical models are effective tools for the simulation of the O3 concentration in the Tanzawa Mountains, because numerical models can possibility complement the lack of O3 monitoring in the Tanzawa Mountains.
