Special Section: Influence of Stratosphere-Troposphere Exchange in a Changing Climate on Atmospheric Transport and Oxidation Capacity (STACCATO) - STA 3. Tropopause folds and cross-tropopause exchange: A global investigation based upon ECMWF analyses for the time period March 2000 to february 2001

Maspoli [Mischa Croci] ; Sprenger [Michael] ; Wernli [Heini]