| Summary: | The amplitude of ozone depletion in the Arctic is monitored every year since 1994 by comparison between total ozone measurements of eight SAOZ / NDACC UV-Vis spectrometer stations deployed in the Arctic and 3-D chemical transport model simulations in which ozone is considered as a passive tracer. The method allows determining the evolution of the daily rate of the ozone destruction and the amplitude of the cumulative loss at the end of the winter. The amplitude of the destruction varies between 0-10% in relatively warm and short vortex duration years to 25-39% in colder and longer ones. However, as shown by the unprecedented depletion of 39% in 2010/11, the loss is not only dependent on the extension of the vortex in spring, but also on its strength limiting its renoxification by import of nitrogen oxide species from the outside, as reported by the total NO2 columns measurements available at the same SAOZ stations. Shown in this presentation will be the evolution of ozone loss and renoxification in the Arctic during the winter 2012/13 compared to that of previous winters. The ability of the two REPROBUS and SLIMCAT 3D Chemical Transport Model to reproduce adequately the observed loss will be further discussed.
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