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4. Conclusions

In this study it filaments of high and low ozone from four ozone soundings that were performed when inner edge of the vortex edge region was above Marambio was studied. It was assumed that the low ozone filaments originated from the core rather than the edge region of the vortex and vice versa for the high ozone filaments and that it could be seen in the behaviour of the trajectories and PV of the air parcels from these filaments. In some cases, as especially for 990922, this assumption seemed to be correct. On the other hand there were discrepancies that might have caused either by the methodology or by the possibility that unlike assumed the origin of the filaments were not as straightforward. Methodological cause might be that there is no real correlation between PV changes and mixing of air on isentropic surfaces.