Quantification of the impact in mid-latitudes of chemical ozone depletion in the 1999/2000 Arctic polar vortex prior to the vortex breakup - Koch, G.; Wernli, H.; Buss, S.; Staehelin, J.; Peter, T.; Liniger, M. A.; Meilinger, S. (Atmos. Chem. Phys. Discuss., 2004)