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Data from the second European stratospheric arctic and middle latitude experiment (SESAME) and the airborne southern hemisphere ozone experiment (ASHOE)(recent campaigns in both hemispheres), and from the upper atmosphere research satellite (UARS) provide information about the movement, and possible mixing, of stratospheric air from the vortex and vortex edge into middle latitudes. Model studies reported here reproduce the observed features and may provide insight into their larger-scale structure. It is now clear that filaments of activated air, removed from the vortex edge, contribute to the observed decline of ozone in middle latitudes.
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