The ozone budget in the stratosphere - Results of a one-dimensional photochemical model

Physics

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Atmospheric Chemistry, Atmospheric Models, Ozone, Photochemical Reactions, Stratosphere, Atmospheric Composition, Free Radicals, Gas Transport, Reaction Kinetics, Turbulent Diffusion

Scientific paper

A one-dimensional numerical model is used to evaluate the relative significance of various stratospheric species to atmospheric ozone formation. A continuity equation is defined for each constituent, with the calculations covering the 0.90 km altitude interval in 1 km steps. A transport term is formulated to account for the vertical concentration gradient, the air density, and the eddy diffusion coefficient. The resulting set of continuity equations is solved with an implicit finite difference scheme. A total of 27 odd oxygen, nitrogen, hydrogen, and chlorine species, together with the photochemical relaxation times and coupled perturbations, are examined. An ozone budget is established for the upper stratosphere, while results are uncertain for the more complex lower stratosphere, where transport properties are more significant.

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