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Acknowledgements

I would like to express my thanks to Dr. Paul Crutzen for having encouraged me to undertake this investigation, and to Arnaldo Torres, meteorologist, and Danilo Araya, engineer, both for their collaboration in preparing the vorticity maps and ozone column profiles and for their valuable comments which helped to improve this study. I am also grateful for the support of the Dirección General de Investigación y Postgrado of the Universidad Técnica Federico Santa María, and of the CYTED Project in Spain. Finally, I wish to thank the Dirección Meteorológica de Chile for its collaboration in supplying data from its network of UV radiation stations.