Sensitivity Analysis of Diurnal Cycle of NO_x, HO_x and O_x Chemistry in Stratosphere

Abstract

A numerical analysis with sensitivity analysis on diurnal cycle of NO_x and O₃ was investigated to specify prime reactions with high impact on O₃ deplations by emissions of exhaust gases. NO_x concentration was measured in a vaccum chamber with emission of low-pressure mercury lamp, and numerical analysis of reactions in the chamber was conducted. Fifth-order BDF method was employed to calculate ordinary differential equations of concentrations and sensitivities. Reactions with high sensitivity for O₃ concentration were limited, and chemical kinetics used in this calculation express history of NO_x concentrations correctly in the chamber. This chemical kinetics was applied to the calculations of diurnal cycle of O₃ concentration in stratosphere. As a result of this study, prime reactions with high sensitivities on O₃ concentration is specified and history of concentrations of NO_x, HO_x and O_x was derived. Characteristics of NO_x, HO_x and O_x chemistry in the stratosphere was specified.