Modelling, Validation, and Calculations of Stratospheric Ozone Dynamics and Latitudinal Changes

This paper presents an engineering system approach of 2-D cylindrical model of mass balance calculations with convection, diffusion, and all potential photolysis, ozone generating and depleting chemical reactions considered.  This model was developed, validated, and tested under different conditions for the stratospheric ozone. The calculated ozone concentrations and profile in the stratosphere at both the Equator and mid-latitudinal location of 40° S were found to exhibit a similar and close profile and peak value of the published measured data. The discrepancy between the calculations and measurements for the average ozone concentration was shown to be less than 1% and the variation of distributions to be less than 19%. The latitudinal changes of ozone concentrations, distribution, and peak of the layer were found to shift from 9.41 ppm at mid-altitude of z = 30 km at the Equator, to 7.81 ppm at z = 34.5 km at 40° S, to 5.78 ppm at higher altitude z = 39 km at the South Pole. The total ozone abundances at strategic latitudes at 0° S, 20° S, 40° S, 60° S, and 90° S, were found to remain stable and not much changed, from 305 DU to 335 DU, except a smaller value of 288 DU at the South Pole. The possible explanations of ozone profile change and peak shifting as affected by solar/UV radiation, latitudinal locations, and ozone-depleting reactions were discussed and elaborated. The 2-D ozone Model presented in this paper is a robust, efficient, executable, and validated model for studying the complex ozone phenomena in the stratosphere.