With a reasonably complete and up-to-date photochemical model of the stratosphere, we find that the calculated stratospheric ozone-column response to chlorine injections is highly nonlinear. The model calculations assume that the background inorganic (or odd) chlorine, C1X, is due to CH3CI and CC1, v Additional C1X is added to the stratosphere by varying input fluxes ofCC12F e and CC13F. The sensitivity, AO3/AClX , of the stratospheric 0 3 column to added C1X is relatively small forCIX •< 3 ppb orAC1X •< 2 ppb; slight ozone increases with CIX are possible over a limited range of CIX if the formation of chlorine nitrate proceeds rapidly. This may have important implications for total ozone-column trend assessment. As C1X increases beyond 3 ppb, the stratospheric O3 column decreases with C1X increasingly rapidly. This marked departure from the linearity calculated in past years is largely due to presently accepted faster rates of reaction of OH with HNO3, HNO,•, HOe, and HeO e. If stratospheric C1X increases to about 9 ppb due to continued usage of CCIeF e, CC13F, and CH3CC13, the stratospheric O 3 colttmn depletion is calculated to be 6.7-9.0%. Principal uncertainties in these calculations, including the rate of formation of chlorine nitrate, the products of its photolysis, and the present day mixing ratio of C1X are discussed. Calculated ozone decreases due to increased NeO concentrations are also presented.
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