Numerical analysis of O
3 depletions by exhaust plume from stratospheric flight at the altitude of 25km was conducted. Expanding box method was employed to simulate a diffusion of exhaust plume in the stratosphere. Concentrations of chemical species and normarized sensitivities of O
3 concentration for reactions were estimated by fifth-order BDF method. Chemical kinetics include NO
x, HO
x and O
x chemistry. As results, it takes over two days that O
3 concentration within a plume becomes ambient lebel within 1ppb. O
3 perturbations were changed by an effect of plume-emission time, and they are bigger in daytime than in nighttime. Distributions of sensitivities of O
3 concentrations for reactions are also changed for the plume-emission time. O
3 depletion is greater by NO
x than by HO
x in exhaust plume.
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