The purpose of this study is broadly to reinvestigate NOx--Clx interactions relative to ozone control in the stratosphere, using the long-established Lawrence Livermore National Laboratory one-dimensional model. To obtain perspective on reasonably expected atmospheric perturbations, this study includes unrealistic conditions in the calculations, and several interesting or unexpected features are found. (1) By varying both NOx and Clx over wide ranges, regions are found where ozone column reduction is linear and nonlinear in added chlorine or in added nitrogen oxides. (2) If the stratosphere had much less NOx than the natural amount, small chlorine increases would cause large reductions of ozone. (3) At high Clx, a region of NOx--Clx space is found where added NOx (at constant Clx) increases the ozone column, but no region was found where added chlorine (at constant nitrous oxide boundary condition) increases the ozone column.

(4)The solar self-healing effect in response to ozone reduction by increasing Clx is much greater than that associated with ozone reduction by increasing nitrous oxide. (5) For any fixed amount of Clx, the amount of chlorine nitrate in the stratosphere is decreased by added NOx, and an explanation for this effect is presented. (6) Any increase of stratospheric Clx shrinks the rate profile of ozone destruction by NOx, and any increase of nitrous oxide shrinks the rate profile of ozone destruction by Clx. (7) Total ozone changes linearly with Clx until the rate of ClO+O exceeds that of NO2+O below about 30 km, and then it becomes nonlinear with downward curvature. (8) Removal of all Clx and all HOx from the stratosphere has only a slight effect on the magnitude and shape of the altitude profile of the rate of ozone destruction by NOx. (9) The NOx and HOx families almost completely suppress the effect of 1 parts per billion by volume (ppbv) chlorine on ozone; but in the absence of NOx and HOx, even 1 ppbv chlorine is a powerful ozone-destroying catalyst from the bottom to the top of the stratosphere. (10) In its altitude flexibility, Clx destruction of ozone is qualitatively different from NOx and HOx destruction of ozone. ¿ American Geophysical Union 1988