How Unusual Were the 2020-2023 Ozone Holes?

The Scientific Assessment of Ozone Depletion 2022 reports the recovery of Antarctic ozone, particularly evident in September, consistent with diminishing concentrations of halogens in the stratosphere. Superimposed on the recovery trend are significant year-to-year fluctuations arising from dynamical variability and potentially influenced by climate forcing and volcanic eruptions. Since 2018 the Antarctic stratosphere has experienced large swings in Antarctic springtime ozone metrics with a sudden stratospheric warming and exceptionally high ozone in 2019 followed by large and long-lasting ozone holes in the following years, prompting questions about the speed and detectability of Antarctic ozone recovery and its potential connections to human-induced climate change.