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

Natarajan, Murali; Damadeo, Robert; Flittner, David

doi:https://doi.org/10.5194/amt-16-75-2023

Articles | Volume 16, issue 1

https://doi.org/10.5194/amt-16-75-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-16-75-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 1

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

Data sets

SAGE III/ISS L2 Solar Event Species Profiles (HDF5) V052 NASA/LARC/SD/ASDC https://doi.org/10.5067/ISS/SAGEIII/SOLAR_HDF5_L2-V5.2

Data Collections EOS MLS Science Team https://disc.gsfc.nasa.gov/datasets?page=1&keywords=ML2O3_005

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.