Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 3 2007 10.5194/acpd-7-7137-2007 http://www.atmos-chem-phys-discuss.net/7/7137/2007/ http://www.atmos-chem-phys-discuss.net/7/7137/2007/acpd-7-7137-2007.html http://www.atmos-chem-phys-discuss.net/7/7137/2007/acpd-7-7137-2007.pdf 7137 7169 2007-05-25 The 1985 southern hemisphere mid-latitude total column ozone anomaly G. E. Bodeker g.bodeker@niwa.co.nz H. Garny D. Smale M. Dameris R. Deckert National Institute of Water and Atmospheric Research, Lauder, New Zealand Meteorological Institute, University of Munich, Munich, Germany DLR-Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany One of the most significant events in the evolution of the ozone layer over southern mid-latitudes since the late 1970s was the large decrease observed in 1985. This event remains unexplained and most state-of-the-art atmospheric chemistry-transport models are unable to reproduce it. In this study, the 1985 southern hemisphere mid-latitude total column ozone anomaly is analyzed in detail based on observed daily total column ozone fields, stratospheric dynamical fields, and calculated diagnostics of stratospheric mixing. The 1985 anomaly appears to result from a combination of (i) an anomaly in the meridional circulation resulting from the westerly phase of the equatorial quasi-biennial oscillation (QBO), (ii) weaker transport of ozone from its tropical mid-stratosphere source across the sub-tropical barrier to mid-latitudes related to the particular phasing of the QBO with respect to the annual cycle, and (iii) a solar cycle induced local reduction in ozone. The results based on observations are compared and contrasted with analyses of ozone and dynamical fields from the ECHAM4.L39(DLR)/CHEM coupled chemistry-climate model (hereafter referred to as E39C). 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