Response of Total Column Ozone at High Latitudes to Sudden Stratospheric Warmings

The total column ozone (TCO) at northern high latitudes is increased over a course of 1–2 months after major sudden stratospheric warming as consequence enhanced eddy transport and diffusive fluxes. We analyzed ground-based measurements TCO from Oslo, Andøya Ny Ålesund 2000 to 2020. During this time interval, 15 warmings (SSWs) occurred. observed variations are in good agreement with those ECMWF Reanalysis v5 (ERA5), showing that ERA5 reliable, even during dynamically active periods. has the advantage it no data gaps polar night. found was by up 190 DU SSW February 2010, one month. composite analysis SSWs provided result on average about 50 month central date SSW.