EGU2020-10539, updated on 25 Apr 2023
https://doi.org/10.5194/egusphere-egu2020-10539
EGU General Assembly 2020
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Overview of the 2019 Sentinel-5p TROpomi vaLIdation eXperiment (TROLIX)

Arnoud Apituley1, Karin Kreher2, Ankie Piters1, John Sullivan3, Michel vanRoozendael4, Tim Vlemmix1, Mirjam den Hoed1, Arnoud Frumau7, Bas Henzing7, Bart Speet7, Jan Vonk8, Pepijn Veefkind1, Diego Alves6, Alexandre Cacheffo6, and the TROLIX-Team*
Arnoud Apituley et al.
  • 1KNMI, RDWD, De Bilt, Netherlands (apituley@knmi.nl)
  • 2BK Scientific, Mainz, Germany
  • 3NASA-GSFC, Greenbelt, Maryland
  • 4BIRA, Uccle, Belgium
  • 6IPEN/UFU/USP, Sao Paulo, Brazil
  • 7TNO, Netherlands
  • 8RIVM, Bilthoven, Netherlands
  • *A full list of authors appears at the end of the abstract

For the validation of Sentinel-5p/TROPOMI the TROpomi vaLIdation eXperiment (TROLIX) was held in the Netherlands based at the Cabauw Experimental Site for Atmospheric Research during September 2019. TROLIX consisted of active and passive remote sensing platforms in conjunction with several balloon-borne and surface measurements.

The intensive observations will serve to establish the quality of TROPOMI L2 main data products (UVAI, Aerosol Layer Height, NO2, O3, HCHO, Clouds) under realistic conditions with varying cloud cover and a wide range of atmospheric conditions.

Since TROPOMI is a hyperspectral imager with a very high spatial resolution of 3.6 x 5.6 km2, understanding local effects such as inhomogeneous sources of pollution, sub-pixel clouds and variations in ground albedo is important to interpret TROPOMI results. Therefore, the campaign included sub-pixel resolution local networks of sensors, involving MAXDOAS and Pandora instruments, around Cabauw (rural) and within the city of Rotterdam (urban). Utilising its comprehensive in-situ and remote sensing observation program in and around the 213 m meteorological tower, Cabauw was the main site of the campaign with focus on vertical profiling using lidar instruments for aerosols, clouds, water vapor, tropospheric and stratospheric ozone, as well as balloon-borne sensors for NO2 and ozone.

The data set collected can be directly compared to the TROPOMI L2 data products, while measurements of parameters related to a-priori data and auxiliary parameters that infuence the quality of the L2 products such as aerosol and cloud profiles and in-situ aerosol and atmospheric chemistry were also collected.

This paper gives an overview of the campaign, and an overview of the participating main and ancillary instrumentation and preliminary results.

Future activities include the deployment in 2020 of an airborne hyperspectral imager.

TROLIX-Team:

Arnoud Apituley, Ankie Piters, Tim Vlemmix, Mirjam den Hoed, Deborah Stein-Zweers, Marc Allaart, Pepijn Veefkind, Henk Eskes, Floris van der Ent, George Saleeb (KNMI), Karin Kreher (BK Scientific), John Sullivan, Tom Mcgee, Larry Twigg, Grant Sumnicht (NASA), Francois Hendrick, Michel Van Roozendael, Alexis Merlaud, Caroline Fayt, Christian Hermans, Gaia Pinardi (BIRA), Steffen Dorner, Thomas Wagner, Bianca Lauster, Alma Ubele (MPIC), Diego Alves Gouveia, Alexandre Cacheffo, Alex Mendes, Fabio Lopes, Eduardo Landulfo (IPEN), Arnoud Frumau, Bas Henzing, Bart Speet (TNO), Jan Vonk (RIVM), Elena Spinei (Virginia Tech), Richard Querel (NIWA), Dimitris Karagkiozidis, Alkis Bais (AUTH), Ronald Hutjes (WUR)

How to cite: Apituley, A., Kreher, K., Piters, A., Sullivan, J., vanRoozendael, M., Vlemmix, T., den Hoed, M., Frumau, A., Henzing, B., Speet, B., Vonk, J., Veefkind, P., Alves, D., and Cacheffo, A. and the TROLIX-Team: Overview of the 2019 Sentinel-5p TROpomi vaLIdation eXperiment (TROLIX), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10539, https://doi.org/10.5194/egusphere-egu2020-10539, 2020.