Transfer of mass-independent fractionation in ozone to other oxygen-containing radicals in the atmosphere

Mass-independent fractionation (MIF) of ozone has been observed in both the troposphere and stratosphere. Because ozone is a photochemically active species, its MIF signature can be imparted to other atmospheric molecules. Using a photochemical equilibrium model for short-lived radical species, I have computed the expected MIF for typical mid-latitude conditions. The model accounts for about similar to 70% of recent measurements of Delta O-17 for H2O2 in rainwater, and predicts large MIF for NO, and CIO species (similar to 40-70 %(0)), and their products (ClONO2 and HNO3). Furthermore, in the stratosphere oxygen exchange reactions between OH and NOx, yield OH with Delta O-17 from 2 to 45 %(0). Stratospheric water produced during H abstraction by OH would be similarly mass-independently fractionated. In the troposphere rapid exchange between OH and H2O erases any MIF signature in OH. These model results depend on several O exchange reactions with unknown activation energies or with rate coefficients known only as upper limits.