Transport processes and ozone perturbations.

We present a numerical model study of the ozone response to projected chlorofluorocarbon increases using a two-dimensional residual Eulerian circulation model. In agreement with some previous studies using classical Eulerian models (in particular, Pyle (1980) and Haigh and Pyle (1982), we find that the predicted ozone reductions during winter and spring at high latitudes are larger than the values predicted by one-dimensional models. This occurs because ozone is largely dynamically controlled at these latitudes and seasons, and because the net transport is directed downward from the region where substantial depletions occur. Some uncertainities in the projected depletions are explored.-Authors