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1. Introduction

Since long ago it has been recognised the relationship between ozone and atmospheric fields from scales ranging from decadal to interdiurnal. While for the long time-scales ozone is influenced by the atmosphere and viceversa, from a couple of weeks to days, ozone variability is mainly attributed to dynamical effects, as the ozone mixing ratio is a quasi-conserved tracer in the lower-stratosphere (Andrews et al. 1987). As a consequence, a clear correspondence between areas of maximum synoptic activity and regions of large ozone fluctuations is established. The nature of such correspondence may be understood in terms of baroclinic waves producing horizontal and vertical motions that affect the ozone distribution, as ozone partial pressure ismaximum in the lower-stratosphere, near the tropopause where this waves also attain a maximum (Vigliarolo et al. 2000 and references therein). Therefore, it is of interest to investigate in detail such dynamical-ozone changes for particular cases. In this paper an extreme ozone event is studied over southern South America (hereafter SA), a region that reports minimum winter mean ozone content and moderate to high ozone daily-variability (Vigliarolo et al. 2000).

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