Tropospheric and stratospheric ozone profiles during the 2019 TROpomi vaLIdation eXperiment (TROLIX-19)

A TROPOspheric Monitoring Instrument (TROPOMI) validation campaign was held in the Nether-
lands based at the CESAR (Cabauw Experimental Site for Atmospheric Research) observatory during September
2019. The TROpomi vaLIdation eXperiment (TROLIX-19) consisted of active and passive remote sensing plat-
forms in conjunction with several balloon-borne and surface chemical (e.g., ozone and nitrogen dioxide) mea-
surements. The goal of this joint NASA-KNMI geophysical validation campaign was to make intensive observa-
tions in the TROPOMI domain in order to be able to establish the quality of the L2 satellite data products under
realistic conditions, such as non-idealized conditions with varying cloud cover and a range of atmospheric con-
ditions at a rural site. The research presented here focuses on using ozone lidars from NASA’s Goddard Space
Flight Center to better evaluate the characterization of ozone throughout TROLIX-19. Results of comparisons
to the lidar systems with balloon, space-borne and ground-based passive measurements are shown. In addition,
results are compared to a global coupled chemistry meteorology model to illustrate the vertical variability and
columnar amounts of both tropospheric and stratospheric ozone during the campaign period.