Modelling tracer budgets in the stratosphere

Abstract

The ozone budget in the stratosphere of a modified diabatic circulation model is compared with traditional Eulerian calculations. The importance of the chemical contribution in comparison with net dynamical contributions, even in the lower stratosphere, is stressed. Furthermore the chemical dependence of the eddy transports is shown to introduce significant differences in the meridional transport and points to a potentially important source of error in two-dimensional simulations of tracer distributions in the stratosphere. Other aspects arising from photochemistry, the photochemical eddy term and the eddy coupling of different species. are also considered.