Articles | Volume 16, issue 1
https://doi.org/10.5194/amt-16-75-2023
https://doi.org/10.5194/amt-16-75-2023
Research article
 | 
10 Jan 2023
Research article |  | 10 Jan 2023

Solar occultation measurement of mesospheric ozone by SAGE III/ISS: impact of variations along the line of sight caused by photochemistry

Murali Natarajan, Robert Damadeo, and David Flittner

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Cited articles

EOS MLS Science Team: SAGE III/ISS L2 Solar Event Species Profiles (HDF5) V052, Earth Data [data set], https://disc.gsfc.nasa.gov/datasets?page=1&keywords=ML2O3_005, last access: 29 June 2022. 
Bogumil, K., Orphal, J., Homann, S., Voigt, P., Spietz, O., Fleischmann, A., Vogel, M., Hartmann, H., Bovensmann, J., Frerick, J., and Burrows, J.: Measurements of molecular absorption spectra with the SCIAMACHY pre-flight model: instrument characterization and reference data for atmospheric remote sensing in the 230–2380 nm region, J. Photoch. Photobio. A, 157, 167–184, 2003. 
Boughner, R. E., Larsen, J. E., and Natarajan, M.: The influence of NO and ClO variations at twilight on the interpretation of solar occultation measurements, Geophys. Res. Lett., 7, 231–234, 1980. 
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Short summary
Photochemically induced changes in mesospheric O3 concentration at twilight can cause asymmetry in the distribution along the line of sight of solar occultation observations that must be considered in the retrieval algorithm. Correction factors developed from diurnal photochemical model simulations were used to modify the archived SAGE III/ISS mesospheric O3 concentrations. For June 2021 the bias caused by the neglect of diurnal variations is over 30% at 64 km altitude and low latitudes.
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