Preprints
https://doi.org/10.5194/amt-2021-32
https://doi.org/10.5194/amt-2021-32

  17 Mar 2021

17 Mar 2021

Review status: a revised version of this preprint is currently under review for the journal AMT.

Ozone Profile Retrieval from nadir TROPOMI measurements in the UV range

Nora Mettig1, Mark Weber1, Alexei Rozanov1, Carlo Arosio1, John P. Burrows1, Pepijn Veefkind2, Anne M. Thompson3, Richard Querel4, Thierry Leblanc5, Sophie Godin-Beekmann6, Rigel Kivi7, and Matthew B. Tully8 Nora Mettig et al.
  • 1Institute of Enivronmental Physics, University of Bremen, Bremen, Germany
  • 2Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands
  • 3NASA/Goddard Space Flight Center, Greenbelt, MD, USA
  • 4National Institute of Water & Atmospheric Research (NIWA), Lauder, New Zealand
  • 5Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, CA, USA
  • 6LATMOS, Sorbonne University, Paris, France
  • 7Finnish Meteorological Institute, Sodankylä, Finland
  • 8Bureau of Meteorology, Melbourne, Australia

Abstract. The TOPAS algorithm to retrieve vertical profiles of ozone from space-borne observations in nadir viewing geometry has been developed at the Institute of Environmental Physics (IUP) of the University of Bremen and applied to TROPOMI L1B spectral data version 2. The spectral data between 270 and 329 nm are used for the retrieval. A re-calibration of the measured radiances is done using ozone profiles from MLS/Aura. Studies with synthetic spectra show that individual profiles in the stratosphere can be retrieved with the accuracy of about 10 %. In the troposphere, the retrieval errors are larger depending on the a-priori profile used. The vertical resolution above 18 km is about 6–10 km and it degrades to 15–25 km below. The vertical resolution in the troposphere is strongly dependent on the solar zenith angle (SZA). The ozone profiles retrieved from TROPOMI with the TOPAS algorithm were validated using data from ozone sondes and stratospheric ozone lidars. Above 18 km, the comparison with sondes shows excellent agreement within less than ±5 % for all latitudes. The standard deviation of mean differences is about 10 %. Below 18 km, the relative mean deviation in the tropics and northern latitudes is still quite good remaining within ±20 %. At southern latitudes larger differences of up to +40 % occur between 10 and 15 km. The standard deviation is about 50 % between 7–18 km and about 25 % below 7 km. The validation of stratospheric ozone profiles with ground-based lidar measurements also shows very good agreement. The relative mean deviation is below ±5 % between 18–45 km with a standard deviation of 10 %. TOPAS retrieval results for one day of TROPOMI observations were compared to MLS and OMPS-LP data. The relative mean difference was found to be largely below ±5 % between 20–50 km with exception of very high latitudes.

Nora Mettig et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-32', Anonymous Referee #3, 24 Mar 2021
    • AC1: 'Reply on RC1', Nora Mettig, 24 Jun 2021
    • AC5: 'Reply on RC1', Nora Mettig, 24 Jun 2021
  • CC1: 'Comment on amt-2021-32', Cheng Liu, 25 Mar 2021
    • AC6: 'Reply on CC1', Nora Mettig, 24 Jun 2021
  • RC2: 'Comment on amt-2021-32', Anonymous Referee #1, 09 Apr 2021
    • AC2: 'Reply on RC2', Nora Mettig, 24 Jun 2021
    • AC4: 'Reply on RC2', Nora Mettig, 24 Jun 2021
  • RC3: 'Comment on amt-2021-32', Anonymous Referee #2, 13 May 2021
    • AC3: 'Reply on RC3', Nora Mettig, 24 Jun 2021

Nora Mettig et al.

Nora Mettig et al.

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Short summary
TROPOMI is a nadir viewing satellite that allows global atmospheric trace gas observations at unprecedented spatial resolution since 2017. The retrieval of ozone profiles with high accuracy has been demonstrated by using the TOPAS (Tikhonov regularized Ozone Profile retrievAl with SCIATRAN) algorithm and applying appropriate spectral corrections to TROPOMI UV data. Ozone profiles from TROPOMI were compared to ozone sonde and lidar profiles showing an agreement to within 5 % in the stratosphere.