Ozone photochemical production and loss rates as a function of latitude and pressure in the lower stratosphere. Measurements of OH, HO2, ClO, NO, and ozone obtained during three altitude profiles during SPADE on May 1, 1993, are used to infer the ozone removal rates. The in situ measurements are scaled according to the observed diurnal profiles to obtain the integrated loss rates. The odd-hydrogen radicals are responsible for greater than 40 % of the photochemical loss in the lower stratosphere. The catalytic action of the halogen radicals accounts for nearly one-third of the total. The high aerosol loading from the Mt. Pinatubo volcanic cloud suppresses NOx levels through the H2O5 hydrolysis reaction. The strong latitudinal dependence of the production rate is driven by the strong solar zenith angle (SZA) dependence of the oxygen photolysis rate. Net removal of ozone at the northern-most latitudes approaches 10 percent per month. [Adopted from Wennberg et al., 1994]
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