Tropospheric chemistry is affected by stratospheric ozone reduction through the impact of enhanced solar UV-B radiation leading to enhanced levels of the key oxidizer in the troposphere, OH. Model results from the Oslo CTM2 have been analyzed to deduce the impact of changes in stratospheric ozone on tro-pospheric chemistry, in particular, changes in surface ozone. Three situations are analyzed: (a) A general study of the sensitivity of surface ozone to changes in column ozone changes under different atmospheric conditions (changes in composition), (b) a specific study of the impact during episodes of high ozone levels, and (c) a study of the impact during a period (1980–2000) of significant ozone depletion. In all cases it is found that tropospheric chemistry (OH,O3) is perturbated, but processes are nonlinear and the ozone perturbation is determined by the distribution of the ozone precursor NOx. Column ozone reduction could be both positive and negative. We find agreement with observations in the few cases where comparisons can be made.
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Isaksen, I.S.A., Rognerud, B., Dalsøren, S., Søvde, A. (2009). Stratospheric Ozone Depletion and Tropospheric Chemistry. In: Zerefos, C., Contopoulos, G., Skalkeas, G. (eds) Twenty Years of Ozone Decline. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2469-5_21
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