AN ISENTROPIC 2-DIMENSIONAL MODEL WITH AN INTERACTIVE PARAMETRIZATION OF DYNAMICAL AND CHEMICAL PLANETARY-WAVE FLUXES

An interactive chemical-dynamical isentropic two-dimensional model is described, and its behaviour analysed when a parametrization of the three longest Rossby waves is included in the model. Eddy fluxes of chemicals and of Ertel's potential vorticity are all calculated from the modelled waves, and are therefore consistent with each other. The chemical fluxes arise from dissipation of zonal asymmetries, both by photochemistry ('chemical eddy' fluxes) and by 'planetary wave breaking'. The chemical eddy fluxes for ozone and NO(y) are much larger than the wave-breaking ones, and thus the diffusion matrix (which has only one non-zero clement) is far from being independent of chemical species. The waves have a large immediate effect on the ozone distribution, but the effect persists throughout the year only when the wave fluxes induce a persistent change in the photochemical equilibrium state for ozone (mainly by changing NO(x)).