The estimates of chemical ozone depletion in winter-spring seasons are given for the Arctic stratosphere based on long-term observations of the vertical distribution of ozone. The features and possible causes for an unusually strong and stable stratospheric polar vortex in the Arctic in the winter 2019/2020, that led to a record ozone loss in recent years, and the dynamic processes associated with this polar vortex are analyzed. The TRACAO trajectory model and ERA5 reanalysis are used for the comparative analysis of ozone depletion in the polar vortex in the winter-spring seasons 2010/2011 and 2019/2020.
