Wang, H. J. RayDamadeo, RobertFlittner, DavidKramarova, NatalyaTaha, GhassanDavis, SeanThompson, Anne M.Strahan, SusanWang, YuhangFroidevaux, LucienDegenstein, DougBourassa, AdamSteinbrecht, WolfgangWalker, Kaley A.Querel, RichardLeblanc, ThierryGodin-Beekmann, SophieHurst, DaleHall, Emrys2024-06-202024-06-202020-05-16Wang, H. J. Ray, Robert Damadeo, David Flittner, Natalya Kramarova, Ghassan Taha, Sean Davis, Anne M. Thompson, et al. “Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground-Based Measurements.” Journal of Geophysical Research: Atmospheres 125, no. 11 (16 May 2020): e2020JD032430. https://doi.org/10.1029/2020JD032430.https://doi.org/10.1029/2020JD032430http://hdl.handle.net/11603/34721The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) was launched on 19 February 2017 and began routine operation in June 2017. The first 2 years of SAGE III/ISS (v5.1) solar occultation ozone data were evaluated by using correlative satellite and ground-based measurements. Among the three (MES, AO3, and MLR) SAGE III/ISS retrieved solar ozone products, AO3 ozone shows the smallest bias and best precision, with mean biases less than 5% for altitudes ~15–55 km in the midlatitudes and ~20–55 km in the tropics. In the lower stratosphere and upper troposphere, AO3 ozone shows high biases that increase with decreasing altitudes and reach ~10% near the tropopause. Preliminary studies indicate that those high biases primarily result from the contributions of the oxygen dimer (O₄) not being appropriately removed within the ozone channel. The precision of AO3 ozone is estimated to be ~3% for altitudes between 20 and 40 km. It degrades to ~10–15% in the lower mesosphere (~55 km) and ~20–30% near the tropopause. There could be an altitude registration error of ~100 m in the SAGE III/ISS auxiliary temperature and pressure profiles. This, however, does not affect retrieved ozone profiles in native number density on geometric altitude coordinates. In the upper stratosphere and lower mesosphere (~40–55 km), the SAGE III/ISS (and SAGE II) retrieved ozone values show sunrise/sunset differences of ~5–8%, which are almost twice as large as what was observed by other satellites or model predictions. This feature needs further study.25 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domainhttps://creativecommons.org/publicdomain/mark/1.0/Text