Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-20155-2008 http://www.atmos-chem-phys-discuss.net/8/20155/2008/ http://www.atmos-chem-phys-discuss.net/8/20155/2008/acpd-8-20155-2008.html http://www.atmos-chem-phys-discuss.net/8/20155/2008/acpd-8-20155-2008.pdf 20155 20192 2008-12-01 An evaluation of the simulation of the edge of the Antarctic vortex by chemistry-climate models H. Struthers h.struthers@niwa.co.nz G. E. Bodeker J. Austin S. Bekki I. Cionni M. Dameris M. A. Giorgetta V. Grewe F. Lefèvre F. Lott E. Manzini T. Peter E. Rozanov M. Schraner National Institute of Water and Atmospheric Research, Lauder, New Zealand Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USA Service d'Aeronomie du CNRS, Institut Pierre-Simon Laplace, Paris, France Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Wessling, Germany Max Planck Institut für Meteorologie, Hamburg, Germany Laboratoire de Meteorologie Dynamique, Paris, France Istituto Nazionale di Geofisica e Vulcanologia, Italy Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy Institute for Atmospheric and Climate Science ETH, Zurich, Switzerland PMOD/WRC, Dorfstrasse 33, CH-7260, Davos Dorf, Switzerland The dynamical barrier to meridional mixing at the edge of the Antarctic spring stratospheric vortex is examined. Diagnostics are presented which demonstrate the link between the shape of the meridional mixing barrier at the edge of the vortex and the meridional gradients in total column ozone across the vortex edge. Results derived from reanalysis and measurement data sets are compared with equivalent diagnostics from five coupled chemistry-climate models to test how well the models capture the interaction between the dynamical structure of the stratospheric vortex and the chemical processes occurring within the vortex. Results show that the accuracy of the simulation of the dynamical vortex edge varies widely amongst the models studied here. This affects the ability of the models to simulate the large observed meridional gradients in total column ozone. Three of the models in this study simulated the inner edge of the vortex to be more than 7° closer to the pole than observed. 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