Project: MPIC TROPOMI applications - The project "MPIC TROPOMI applications" focusses on applications of TROPOMI L2 NO2 measurements for determining NOx emissions and sinks, making use of the high signal to noise ratio and high horizontal spatial resolution of TROPOMI. Summary: We present an updated (v2) catalog of NOx emissions from point sources as derived from TROPOMI measurements of NO2 (PAL product, May 2018 - Nov 2021) combined with wind fields from ERA5. Compared to version 1 of the catalog, several improvements have been introduced to the algorithm. Most importantly, several corrections are applied, accounting for the effects of plume height on satellite sensitivity, 3D topographic effects, and the chemical loss of NOx , resulting in considerably higher and more accurate NOx emissions. In addition, error estimates are provided for each point source, taking into account the uncertainties of the individual retrieval steps. The catalog v2 is based on a fully automated iterative detection algorithm of point sources worldwide. It lists 1139 locations that have been found to be significant NOx sources. The majority of these locations match to power plants listed in the global power plant database. Other NOx point sources correspond to cement plants, metal smelters, industrial areas, or medium-sized cities.
