17 Feb 2022
17 Feb 2022
Status: this preprint is currently under review for the journal AMT.

Tropospheric ozone retrieval by a combination of TROPOMI/S5P measurements with BASCOE assimilated data

Klaus-Peter Heue1,2, Diego Loyola1, Fabian Romahn1, Walter Zimmer1, Simon Chabrillat3, Quentin Errera3, Jerry Ziemke4, and Natalya Kramarova4 Klaus-Peter Heue et al.
  • 1Institut für Methodik der Fernerkundung am Deutschen Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
  • 2Technische Universität München (TUM), Munich, Germany
  • 3Koninklijk Belgisch Instituut voor Ruimte-Aeronomie / Institut royal d’Aéronomie Spatiale de Belgique, Brussels, Belgium
  • 4NASA GSFC, Greenbelt, Maryland, USA

Abstract. We present a new tropospheric ozone data set based on TROMOMI/Sentinel-5 Precursor (S5P) total ozone mea- surements combined stratospheric ozone data from the Belgian Assimilation System for Chemical ObsErvations (BASCOE). BASCOE is constrained by assimilating ozone observations from the microwave limb sounder (MLS). The tropospheric ozone algorithm is similar to the well established OMI-MLS or OMPS-MERRA-2 retrieval. Compared to this we gain spatial resolu- tion when applying the algorithm to TROPOMI data (5.5 × 3.5 km2) and extend these data record into the future.

Compared to the OMPS-MERRA-2 data a mean positive bias of ≈ 3 DU is found. A small negative bias of about 2 DU is observed in the tropics relative to the operational TROPOMI tropospheric (S5P_O3_TCL) data based on the CCD algorithm. The new tropospheric ozone data (S5P-BASCOE) is compared to a set of globally distributed ozone sondes data integrated up to the tropopause level. For the comparison both the mean of the satellite observations around the sounding station and the closest column data are used. Depending on the latitude the S5P-BASCOE deviate from the sondes and between 0 and 5 DU, indicating a good agreement. However, some exceptional larger positive deviation up to ±10 DU are found. The monthly mean tropospheric column as well as time series for selected places showed the expected spatial and temporal pattern.

Klaus-Peter Heue et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on amt-2022-23', Owen Cooper, 24 Feb 2022
    • AC3: 'Reply on Owen Coopers comment', Klaus-Peter Heue, 09 Jun 2022
  • RC1: 'Comment on amt-2022-23', Anonymous Referee #1, 10 Mar 2022
    • AC1: 'Reply on RC1', Klaus-Peter Heue, 09 Jun 2022
  • RC2: 'Comment on amt-2022-23', Anonymous Referee #2, 04 Apr 2022
    • AC2: 'Reply on RC2', Klaus-Peter Heue, 09 Jun 2022

Klaus-Peter Heue et al.

Klaus-Peter Heue et al.


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Short summary
To retrieve tropospheric ozone column information, we subtract stratospheric column data from BASCOE from TROPOMI /S5P total ozone columns. The new S5P-BASCOE data agrees well with existing tropospheric data like OMPS-MERRA-2. The data is also compare to ozone soundings. The tropospheric ozone columns show the expected temporal and spatial patterns. We will apply the algorithm also to future UV nadir missions like Sentinel 4 or 5 or to recent and ongoing missions like GOME_2 or OMI.