Uncertainties in reactive uptake coefficients for solid stratospheric particles .2. Effect on ozone depletion

Uncertainties in reactive uptake coefficients for reactions involving KCI, ClONO2 and HOCl on nitric acid trihydrate (NAT) and sulfuric acid tetrahydrate (SAT) are shown to affect modeled Arctic stratospheric ozone depletion in a photochemical box model. The main contribution to the difference arises from the reaction ClONO2 + HCl --> Cl-2 + HNO3 in early to mid-winter. During this period, differences in predicted HCl and ClONO2 are more than 1 ppbv for several weeks when an upper limit for solid PSC existence is assumed. Ozone depletion is greater when liquid aerosols persist through the winter compared with cases where solid particles are assumed to form.