Characterization and improvements of the UV radiometric calibration for the TROPOMI operational ozone profile retrieval algorithm

Di Pede, Serena; Loots, Erwin; Ludewig, Antje; van der Plas, Emiel; van Amelrooy, Edward; van Hoek, Mirna; Sneep, Maarten; ter Linden, Mark; Keppens, Arno; Veefkind, J. Pepijn

doi:10.5194/amt-19-1875-2026

Articles | Volume 19, issue 5

https://doi.org/10.5194/amt-19-1875-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-19-1875-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 5

Research article

|

17 Mar 2026

Research article |

| 17 Mar 2026

Characterization and improvements of the UV radiometric calibration for the TROPOMI operational ozone profile retrieval algorithm

Serena Di Pede, Erwin Loots, Antje Ludewig, Emiel van der Plas, Edward van Amelrooy, Mirna van Hoek, Maarten Sneep, Mark ter Linden, Arno Keppens, and J. Pepijn Veefkind

Model code and software

Disamar software v4.1.5 (4.1.5) Johan F. de Haan https://doi.org/10.5281/zenodo.6304984

Short summary

TROPOMI (TROPOspheric Monitoring Instrument) provides daily ozone profile data from ultraviolet bands 1–2. Accurate radiometric calibration is critical below 300 nm where signals are low. A Level-2 soft calibration complements L1 calibration and reveals spectral, temporal, and across-track biases. Re-analysis of calibration data enabled improved L1 corrections to address remaining straylight and residual signal effects, reducing soft calibration magnitude by ~15–20 % and associated biases in L1b v3.0 and ozone processor v2.9.0.