Updated trends of the stratospheric ozone vertical distribution in the 60° S–60° N latitude range based on the LOTUS regression model

Abstract. This study presents an updated evaluation of stratospheric ozone profile trends in the 60? S–60? N latitude range over 2000–2020 period using version Long-term Ozone Trends and Uncertainties Stratosphere (LOTUS) regression model that was used to evaluate such up 2016 for last WMO Assessment (2018). In addition derivation detailed as a function vertical coordinates, regressions are performed with datasets averaged broad bands, i.e. 60–35? S, 20? S–20? 35–60? N. The same methodology assessment is applied combine these bands order compare results previous studies. Longitudinally resolved merged satellite records also considered provide better comparison retrieved from ground-based records, e.g. lidar, ozonesondes, Umkehr, microwave Fourier transform infrared (FTIR) spectrometers at selected stations where long-term time series available. includes derived REF-C2 simulations Chemistry Climate Model Initiative (CCMI-1). work confirms past showing increase upper stratosphere, which now significant three bands. largest Northern Southern Hemisphere midlatitudes, ?2.2 ± 0.7 % per decade ?2.1 hPa 0.6 ?3.2 respectively compared ?1.6 ?2.6 tropics. New trend signals have emerged decrease tropics around 35 non-significant southern midlatitudes about 20 hPa. Non-significant negative lowermost most pronounced While very good agreement obtained between CCMI-1 simulation observed lower stratosphere not reproduced by models and, particular, northern report increase. However, lower-stratospheric uncertainties quite large, both measured modelled trends. Finally, longitudinally reasonable European Alpine tropical regions, while Lauder station they show some differences.