Preprints
https://doi.org/10.5194/amt-2021-412
https://doi.org/10.5194/amt-2021-412

  13 Dec 2021

13 Dec 2021

Review status: this preprint is currently under review for the journal AMT.

Combined UV and IR ozone profile retrieval from TROPOMI and CrIS measurements

Nora Mettig1, Mark Weber1, Alexei Rozanov1, John P. Burrows1, Pepijn Veefkind2, Nadia Smith3, Anne M. Thompson4,5, Ryan M. Stauffer4, Thierry Leblanc6, Rigel Kivi7, Matthew B. Tully8, Roeland Van Malderen9, Ankie Piters2, Bogumil Kois10, René Stübi11, and Pavla Skrivankova12 Nora Mettig et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 2Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands
  • 3Science and Technology Corporation, Columbia, MD, USA
  • 4NASA/Goddard Space Flight Center, Greenbelt, MD, USA
  • 5University of Maryland-Baltimore County/Joint Center for Earth Systems Technology, Baltimore, MD, USA
  • 6Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, CA, USA
  • 7Finnish Meteorological Institute, Space and Earth Observation Centre, Sodankylä, Finland
  • 8Bureau of Meteorology, Melbourne, Australia
  • 9Royal Meteorological Institute of Belgium, Brussels (Uccle), Belgium
  • 10Institute of Meteorology and Water Management, Warsaw, Poland
  • 11Federal Office of Meteorology and Climatology MeteoSwiss, Payerne, Switzerland
  • 12Czech Hydrometeorological Institute, Praha, Czech Republic

Abstract. Vertical ozone profiles from combined spectral measurements in the ultraviolet and infrared spectral range were retrieved by using data from TROPOMI/S5P and CrIS/Suomi-NPP, which are flying in loose formation three minutes apart in the same orbit. A previous study of ozone profiles retrieved exclusively from TROPOMI UV spectra showed that the vertical resolution in the troposphere is clearly limited (Mettig et al, 2021). The vertical resolution and the vertical extent of the ozone profiles is improved by combining both wavelength ranges compared to retrievals limited to UV or IR spectral data only. The combined retrieval particularly improves the accuracy of the retrieved tropospheric ozone and to a lesser degree stratospheric ozone up to 30 km. An increase in the degree-of-freedom by one was found in the UV+IR retrieval compared to the UV-only retrieval. Compared to previous publications, which investigated combinations of UV and IR observations from the pairs OMI/TES and GOME-2/IASI, the degree of freedom is lower, which is attributed to the reduced spectral resolution of CrIS compared to TES or IASI. Tropospheric lidar and ozonesondes were used to validate the ozone profiles and tropospheric ozone column (TOC). From the comparison with tropospheric lidars both ozone profiles and TOCs show smaller biases for the retrieved data from the combined UV+IR observation than the UV observations alone. While the TOCs show good agreement, the profiles have a positive bias of more than 20 % between 10 and 15 km. The reason is probably a positive stratospheric bias from the IR retrieval. The comparison of the UV+IR and UV ozone profiles up to 30 km with MLS (Microwave Limb Sounder) demonstrates the improvement of the UV+IR profile in the stratosphere.

Nora Mettig et al.

Status: open (until 18 Jan 2022)

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Nora Mettig et al.

Nora Mettig et al.

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Short summary
Vertical ozone profiles from combined spectral measurements in the UV and IR spectral range were retrieved by using data from TROPOMI/S5P and CrIS/Suomi-NPP. The vertical resolution and accuracy of the ozone profiles is improved by combining both wavelength ranges compared to retrievals limited to UV or IR spectral data only. The advancement of our TOPAS algorithm for combined measurements is required because in the UV-only retrieval the vertical resolution in the troposphere is very limited.