Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 13 2009 10.5194/acp-9-4251-2009 http://www.atmos-chem-phys.net/9/4251/2009/ http://www.atmos-chem-phys.net/9/4251/2009/acp-9-4251-2009.html http://www.atmos-chem-phys.net/9/4251/2009/acp-9-4251-2009.pdf 4251 4260 2009-07-03 Reassessment of causes of ozone column variability following the eruption of Mount Pinatubo using a nudged CCM P. Telford paul.telford@atm.ch.cam.ac.uk P. Braesicke O. Morgenstern J. Pyle NCAS-Chemistry-Climate, University of Cambridge, Cambridge, UK now at: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, Central Otago 9352, New Zealand The eruption of Mount Pinatubo produced the largest loading of stratospheric sulphate aerosol in the twentieth century. This heated the tropical lower stratosphere, affecting stratospheric circulation, and provided enhanced surface area for heterogeneous chemistry. These factors combined to produce record low values of "global" total ozone column. Though well studied, there remains some uncertainty about the attribution of this low ozone, with contributions from both chemical and dynamical effects. We take a complementary approach to previous studies, nudging the potential temperature and horizontal winds in the new UKCA chemistry climate model to reproduce the atmospheric response and assess the impact on global total ozone. We then combine model runs and observations to distinguish between chemical and dynamical effects. To estimate the effects of increased heterogeneous chemistry on ozone we compare runs with volcanically enhanced and background surface aerosol density. The modelled depletion of global ozone peaks at about 7 DU in early 1993, in good agreement with values obtained from observations. 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