Abstract
Wind tunnel experiment was performed on concentration fluctuation of short timely released tracer gas in atmospheric boundary layer. Concentration fluctuation was measured by the fast response flame ionization detector and mean concentration and the instantaneous high concentration value were evaluated. Ensemble mean concentration of short timely released (Cflat) and time average concentration of continuous release (Cmean) showed similar features. Concentration ratio of maximum 1%value (c99) of short timely released showed larger scatter than those of the continuous released. Furthermore, the probability density function of c99 showed almost the same profiles of lognormal distribution on a gas center axis, viz., plume center position, and the exponential distribution at plume edge position, and gumbel distribution at both measuring positions.
