Reply on RC1

Abstract

The features of dynamical processes and changes in the ozone layer in the Arctic stratosphere during the winterspring season 2019-2020 are analyzed using ozonesondes, reanalysis data and numerical experiments with a chemistrytransport model (CTM). Using the trajectory model of the Central Aerological Observatory (TRACAO) and the ERA5 10 reanalysis ozone mixing ratio data, a comparative analysis of the evolution of stratospheric ozone averaged along the trajectories in the winter-spring seasons of 2010-2011, 2015-2016, and 2019-2020 was carried out, which demonstrated that the largest ozone loss at altitudes of 18-20 km within stratospheric polar vortex in the Arctic in winter-spring 2019-2020 exceeded the corresponding values of the other two winter-spring seasons 2010-2011 and 2015-2016 with the largest decrease in ozone content in recent year. The total decrease in the column ozone inside the stratospheric polar vortex, 15 calculated using the vertical ozone profiles obtained based on the ozonesondes data, in the 2019-2020 winter-spring season was more than 150 Dobson Units, which repeated the record depletion for the 2010-2011 winter-spring season. At the same time, the maximum ozone loss in winter 2019-2020 was observed at lower levels than in 2010-2011, which is consistent with the results of trajectory analysis and the results of other authors. The results of numerical calculations with the CTM with dynamical parameters specified from the MERRA-2 reanalysis data, carried out according to several scenarios of accounting 20 for the chemical destruction of ozone, indicated that both dynamical and chemical processes make contributions to ozone loss inside the polar vortex. In this case, dynamical processes predominate in the western hemisphere, while in the eastern hemisphere chemical processes make an almost equal contribution with dynamical factors, and the chemical depletion of ozone is determined not only by heterogeneous processes on the surface of the polar stratospheric clouds, but by the gasphase destruction in nitrogen catalytic cycles as well. 25 of the stratosphere and upper atmosphere (Funke et al., 2016;Pedatella et al., 2018) and ozone layer (Smyshlyaev et al., 30 2016; WMO, 2018). Due to the stronger wave activity and the frequent occurrence of Sudden Stratospheric Warming (SSW), and, consequently, the less stable and warm stratospheric polar vortex, significant ozone anomalies are observed in the Arctic less often than in the Antarctic, where the main SSW was observed only in September 2002 (Solomon, 2014).However, Antarctica has also experienced strong interannual variability in recent years. Thus, in 2015, the ozone anomaly in Antarctica was one of the most significant for all observation years (Vargin et al., 2020a), while in 2019 it was one of the 35