Bok Wintertime polar ozone evolution during stratospheric vortex break-down. Tweedy, O.; Limpasuvan, V.; Smith, A.; Richter, J.; Orsolini, Y.; Stordal, F.; Kvissel, O.-K. Publikasjonsdetaljer Poster presented at American Geophysical Union annual meeting, San Francisco, December 6-12, 2011.