Abstract
In order to study the characteristics of turbulent diffusion over an urban area, constant-volume balloons with transponders were released at altitudes of 200 and 400 m, and their behavior was observed over the Tokyo Metropolitan area.
The atmos p heric diffusivities are derived from the Lagrangian properties of the balloons, in relation to the temperature lapse rate and the turbulent intensity. The result shows that the lateral diffusivity, Ky, has no direct relation to the lapse rate or the turbulent intensity. However, the vertical diffusivity, IC, is closely related with the lapse rate as well as with the turbulent intensity.
