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The Optical Spectrograph and InfraRed Imaging System (OSIRIS) was launchedaboard the Odin satellite in 2001 and is continuing to take limb-scatteredsunlight measurements of the atmosphere. This work aims to characterize andassess the stability of the OSIRIS 11 yr v5.0x ozone data set. Threevalidation data sets were used: the v2.2 Microwave Limb Sounder (MLS) and v6Global Ozone Monitoring by Occultation of Stars (GOMOS) satellite datarecords, and ozonesonde measurements. Global mean percent differencesbetween coincident OSIRIS and validation measurements are within 5% atall altitudes above 18.5 km for MLS, above 21.5 km for GOMOS, and above17.5 km for ozonesondes. Below 17.5 km, OSIRIS measurements agree withozonesondes within 5% and are well-correlated(<i>R</i> > 0.75) with them. For low OSIRIS optics temperatures(< 16 °C), OSIRIS ozone measurements have a negativebias of 1–6% compared with the validation data sets for 25.5–40.5 km.Biases between OSIRIS ascending and descending node measurements wereinvestigated and found to be related to aerosol retrievals below 27.5 km.Above 30 km, agreement between OSIRIS and the validation data sets wasrelated to the OSIRIS retrieved albedo, which measures apparent upwelling,with a positive bias in OSIRIS data with large albedos. In order toassess the long-term stability of OSIRIS measurements, global average driftsrelative to the validation data sets were calculated and were found to be< 3% per decade for comparisons with MLS for19.5–36.5 km, GOMOS for 18.5–54.5 km, and ozonesondes for12.5–22.5 km. Above 36.5 km, the relative drift for OSIRIS versus MLSranged from ~ 0 to 6% per decade, depending on the data set used to convert MLSdata to the OSIRIS altitude versus number density grid. Overall, this workdemonstrates that the OSIRIS 11 yr ozone data set from 2001 to the presentis suitable for trend studies

Assessment of Odin-OSIRIS ozone measurements from 2001 to the present using MLS, GOMOS, and ozonesondes