Regional and global tropopause fold occurrence and related ozone flux across the tropopause

G. Ancellet, S. Blonsky, D. De Muer, A. Ebel, H. Elbern, J. Hendricks, J. Kowol, C. Mancier, R. Sladkovic, H.G.J. Smit, P. Speth, T. Trickl and P. Van Haver