]> 2026-04-25T22:31:13+02:00 TROLIX-19 0 en 2025-07-09T11:45:43Z 2460865.990081 2025-09-05T08:03:09Z 2460923.8355208 false TROLIX-19 Cabauw A Sentinel-5p/TROPOMI validation campaign was held in the Netherlands based at the Cabauw Experimental Site for Atmospheric Research during September/October 2019. The 2019 TROpomi vaLIdation eXperiment (TROLIX’19) consisted of active and passive remote sensing platforms in conjunction with several balloon-borne, airborne and surface chemical measurements. The goal of this geophysical validation campaign was to make intensive observations for thevalidation of TROPOMI L2 main data products (such as NO2, O3, HCHO, aerosol layer height, clouds and UVAI) under realistic, non-idealized 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 3.5 km x 7 km, 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 includes sub-pixel resolution local networks of sensors, involving Pandora and MAX-DOAS instruments, around Cabauw (51.97°N, 4.93°E) and within the city of Rotterdam (51.92°N, 4.48°E). Cabauw is considered rural while Rotterdam is densely populated and industrialized. CESAR (Cabauw Experimental Site for Atmospheric Research), using its comprehensive in-situ and remote sensing observation program in and around the 213 m meteorological tower (see Section 3), 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. The ozonesonde profiles were measured at KNMI in De Bilt which is approximately 23 km from the CESAR site. Instruments that were used: - Stationary MAX-DOAS and Pandora instruments in different locations - BIRA Mobile-DOAS instrument - NO2 sondes - Ozonesondes - NASA LIDAR ozone observations - Raman LIDAR CAELI - In-situ NO, NO2, O3 and aerosols measurements 2019-09-30Z 2458756.5 51.970271,4.926209 2019-09-01Z 2458727.5 TROLIX-19 0 0 leaflet 1 [[:TROLIX-19]] TROLIX-19# QUERY90a5f3d40b59ba378f76f90271ae0b65 0 1 datatables 3 [[File:+]] [[pertainsTo::TROLIX-19]] TROLIX-19# QUERYc7f21b5048ed59e5b00d31be0b205686