EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

TROPOMI glyoxal tropospheric column retrievals: description, inter-satellite comparison and validation

Christophe Lerot1, François Hendrick1, Isabelle De Smedt1, Nicolas Theys1, Jonas Vlietinck1, Huan Yu1, Michel Van Roozendael1, Jenny Stavrakou1, Jean-François Müller1, Leonardo Alvarado2, Andreas Richter2, Pieter Valks3, Diego Loyola3, Hitoshi Irie4, Vinod Kumar5, Thomas Wagner5, and Christian Retscher6
Christophe Lerot et al.
  • 1Royal Belgian Institute for Space Aeronomy , Brussels, Belgium
  • 2University of Bremen, Institute of Environmental Physics, Germany
  • 3Institut für Methodik der Fernerkundung (IMF), Deutsches Zentrum für Luft und Raumfahrt (DLR), Oberpfaffenhofen, Germany
  • 4Center for Environmental Remote Sensing, Chiba University, Japan
  • 5Max Planck Institute for Chemistry, Mainz, Germany
  • 6European Space Agency, ESRIN, Frascati, Italy

The ESA S5p+Innovation programme aims at supporting the development of new TROPOMI scientific products. As part of this activity, a glyoxal tropospheric column algorithm, relying on heritage from SCIAMACHY, GOME-2 and OMI, has been adapted to TROPOMI and further developed. This product provides information on volatile organic compounds (VOC) emissions as glyoxal is mainly released in the atmosphere as an intermediate product of VOC oxidation, but also directly emitted from biomass burning events.

We present here the BIRA-IASB S5p glyoxal product, which relies on a DOAS approach: spectral fits in the 435-460 nm window provide glyoxal slant columns, which are then converted into tropospheric columns by means of air mass factors and application of a background correction. In particular, the algorithm has been improved to mitigate the impact of scene brightness inhomogeneity and of non-linearity in case of strong NO2 absorption. The retrieved columns are provided along with total error estimates resulting from the propagation of uncertainties at every step in the algorithm chain.

We also highlight the excellent consistency between the retrievals from TROPOMI and those from OMI and GOME-2A/B obtained with a similar algorithm. In addition, the good quality of the product is demonstrated with comparisons with MAX-DOAS glyoxal observations at a few stations in Asia and Europe.

How to cite: Lerot, C., Hendrick, F., De Smedt, I., Theys, N., Vlietinck, J., Yu, H., Van Roozendael, M., Stavrakou, J., Müller, J.-F., Alvarado, L., Richter, A., Valks, P., Loyola, D., Irie, H., Kumar, V., Wagner, T., and Retscher, C.: TROPOMI glyoxal tropospheric column retrievals: description, inter-satellite comparison and validation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14432,, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.