Abstract
A mathematical model of total nitrogen (TN) balance in the atmosphere was developed to evaluate the supplied TN from the atmosphere into the forested mountain area through the rainwater. In this model, when initial TN concentration in the atmosphere, wet deposition rate, dry deposition rate, TN flux in the atmosphere and precipitation were specified, time evolution of TN concentration in the atmosphere and in the rainwater could be estimated. Applicability of the model was examined in a forested mountain area (Aoya River basin; 4500 ha) located in the central part of Japan and in the campus of Gifu University in the northern part of Gifu City. As the results, the governing factors of the accumulation process of TN in the atmosphere were the advection of TN in the atmosphere and the removal of TN by the precipitation, and the seasonal variation of TN concentration in the rainwater, which were obtained during the longer measurement period, could be estimated well.
