THE EFFECT OF UNCERTAINTIES IN KINETIC AND PHOTOCHEMICAL DATA ON MODEL PREDICTIONS OF STRATOSPHERIC OZONE DEPLETION

During the past few years, three-dimensional chemical transport models have matured to a point at which their results are often in good agre ement with observations, lending confidence to model estimates of ozon e loss. In this paper a Lagrangian photochemical model is used to asse ss the error in model predictions that results from errors in the kine tic and photochemical data used by the model. The results indicate tha t Arctic ozone destruction can be modeled with an uncertainty of +/- 2 5% (1 sigma) and that midlatitude ozone destruction can be modeled wit h an uncertainty of +/- 50%. It is also shown that two reactions, from a total of more than 100, are responsible for more than a third of th e uncertainty in model calculations of Arctic ozone loss.