Preprints
https://doi.org/10.5194/amt-2022-133
https://doi.org/10.5194/amt-2022-133
 
20 Jun 2022
20 Jun 2022
Status: this preprint is currently under review for the journal AMT.

An Improved OSIRIS NO2 Profile Retrieval in the UTLS and Intercomparison with ACE-FTS and SAGE III/ISS

Kimberlee Dubé1, Daniel Zawada1, Adam Bourassa1, Doug Degenstein1, William Randel2, David Flittner3, Patrick Sheese4, and Kaley Walker4 Kimberlee Dubé et al.
  • 1Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatchewan, Canada
  • 2National Center for Atmospheric Research, Boulder, CO, USA
  • 3NASA Langley Research Center, Hampton, VA, USA
  • 4University of Toronto, Department of Physics, Toronto, Canada

Abstract. The v7.2 NO2 retrieval for the Optical Spectrograph and InfraRed Imager System (OSIRIS) was designed to improve sensitivity in the Upper Troposphere-Lower Stratosphere (UTLS) and to reduce an observed low bias in the previous version, v6.0. The details of this retrieval are described, and then the data are compared to coincident NO2 profiles from the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS) and the Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS). The the PRATMO photochemical box model was used to account for differences in the measurement times of the instruments: all datasets were scaled to the same local solar time of 12:00 pm. Coincident ACE-FTS and OSIRIS NO2 measurements agree within 20 % throughout much of the stratosphere. Coincident SAGE III/ISS and OSIRIS NO2 measurements also agree within 20 %, with OSIRIS biased low at all altitudes and latitudes. The ACE-FTS, OSIRIS, and SAGE III-ISS NO2 monthly zonal mean data show very similar variability in time at most altitude and latitudes.

Kimberlee Dubé et al.

Status: open (until 26 Jul 2022)

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Kimberlee Dubé et al.

Kimberlee Dubé et al.

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Short summary
Satellite observations are important for monitoring changes in atmospheric composition. Here we describe an improved version of the NO2 retrieval for the Optical Spectrograph and InfraRed Imager System. The resulting NO2 profiles are compared to those from the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer and the Stratospheric Aerosol and Gas Experiment III on the International Space Station. All datasets agree within 20 % throughout the stratosphere.