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Acknowledgements

Our thanks for the stratospheric data used in this study go to the Free University Berlin and NCEP. We wish also to express our thanks to the SC&C Company for the support of SPSS software used in the Dept. of Meteorology and Environment Protection. Finally, part of the work was done under support of the project of Charles University Grant Agency B-GEO-97/3. The work was partly supported in framework of research project CEZ: J13/98:113200004 as well.