Passive and active total ozone columns simulated by the chemical transport model TOMCAT/SLIMCAT (Chipperfield, 1999) and the merged dataset of total ozone from Système d'Analyse par Observation Zénithale (SAOZ, Pommereau and Goutail, 1988) ground-based instruments and Multi-Sensor Reanalysis (MSR2, van der A et al., 2010, 2015) for the polar stations described in the Table here below. Table. Arctic and Antarctic stations included in the study: station name and ID, latitude, longitude and measurement periods of SAOZ and MSR2 datasets. Station (ID) Lat, Lon SAOZ dataset MSR2 dataset Eureka, Nunavut (EU) 80.1°N, 86.4°W 2005-2020 1990-2022 Ny-Alesund, Svalbard (NY) 78.9°N, 11.9° E 1991-2022 1990-2022 Thule, Greenland (TH) 76.5°N, 68.8°W 1999-2003, 2005-2016 1990-2022 Scoresbysund, Greenland (SC) 70.5°N, 22.0°W 1991-2017, 2019-2022 1990-2022 Sodankyla, Finland (SK) 67.4°N, 26.6° E 1991-2022 1990-2022 Sondre Stromfjord, Greenland (SS) 67.0°N, 50.6°W 2018-2022 1990-2022 Zhigansk, Russia (ZH) 66.8°N, 123.4° E 1992-2013 1990-2022 Salekhard, Russia (SA) 66.5°N, 66.7°E 2002-2016 1990-2022 Marambio, Antarctica (MB) 64.2°S, 56.7°W - 1989-2021 Dumont d’Urville, Antarctica (DD) 66.7°S, 140.0°E 1989-2021 1989-2021 Rothera, Antarctica (RO) 67.6°S, 68.1°W 2007-2021 1989-2021 Syowa, Antarctica (SW) 69.0°S, 39.6°E - 1989-2021 Neumayer, Antarctica (NM) 70.7°S, 8.3°W - 1989-2021 Terra Nova, Antarctica (TN) 74.8°S, 164.5°E - 1989-2021 Concordia, Antarctica (DO) 75.1°S, 123.4°E 2007-2021 1989-2021 Halley, Antarctica (HB) 75.6°S, 26.8°W - 1989-2021 Each file corresponds to the whole winter time data set of the station identified by its ID: O3_PassActSLIMCAT_CompositeMSR2SAOZ_ID.txt 1st column: Year 2nd column: Day of Year (DoY) 3rd column: Passive ozone column (without chemistry) modelled by TOMCAT/SLIMCAT (O3pasS). 4th column: Active ozone column (with full chemistry) modelled by TOMCAT/SLIMCAT (O3actS). 5th column: merged data from SAOZ observations and MSR2 (O3comp) Passive and active tracers of SLIMCAT were normalized to O3comp data in the beginning of the winter. NaN is used when there is no observation either from SAOZ instrument or MSR2 dataset or from the model. References Chipperfield, M. P.: New version of the TOMCAT/SLIMCAT offline chemical transport model: Intercomparison of stratospheric tracer experiments, Q. J. Roy. Meteor. Soc., 132, 1179–1203, https://doi.org/10.1256/QJ.05.51, 2006. Pommereau, J.-P., and Goutail, F.: O3 and NO2 ground-based measurements by visible spectrometry during arctic winter and spring 1988, Geophys. Res. Lett., 15, 891–894, https://doi.org/10.1029/GL015i008p00891,1988. van der A, R. J., Allaart, M. A. F., and Eskes, H. J.: Multi sensor reanalysis of total ozone, Atmos. Chem. Phys., 10, 11277–11294, https://doi.org/10.5194/acp-10-11277-2010, 2010. van der A, R. J., Allaart, M. A. F., and Eskes, H. J.: Extended and refined multi sensor reanalysis of total ozone for the period 1970–2012, Atmos. Meas. Tech., 8, 3021–3035, https://doi.org/10.5194/amt-8-3021-2015, 2015.