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Vortex-averaged Arctic ozone depletion in the winter 2002/2003

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Fig. 1. Modified potential vorticity MPV north of 50 ◦ N in units of PVU at θ = 475 K on 19 January 2003 from ECMWF analyses
Fig. 3. Diabatic cooling during the winter 2002/2003 calculated along Lagrangian trajectories ten days back in time for air masses ending in the vortex
Fig. 4. The splitting of the vortex on 18 February 2003. Modified potential vorticity MPV in units of PVU at θ = 475 K from ECMWF analyses.
Fig. 5. Ozone mixing ratios, averaged over ten-day intervals and over vortex areas (collar, middle and centre), corrected for diabatic descent and transport into the vortex

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