Constraints on the dynamical and chemical theories of the ?Ozone Hole?

Summary We report calculation results which could impose some constraints for the proposed chemical and dynamical theories on the ozone hole. One set of calculations is about the consistency between the observed optical thickness of polar stratospheric clouds (PSC) and the surface required for the heterogeneous reactions by the chemical theories. Assuming a reaction rate for ClNO₃+H₂O we find the sticking coefficient to be larger than 0.1 for consistency with observed PSC extinctions. The other set of calculations is about the perturbation to the residual circulation due to the presence of additional heating produced by PSCs. The perturbed residual circulation is of the opposite sign (i.e. downward) with respect to that necessary for the dynamical generation of an ozone hole.