Top-Down NO Emissions of European Cities Based on the Downwind Plume of Modelled and Space-Borne Tropospheric NO₂ Columns.

Top-down estimates of surface NO emissions were derived for 23 European cities based on the downwind plume decay of tropospheric nitrogen dioxide (NO₂) columns from the LOTOS-EUROS (Long Term Ozone Simulation-European Ozone Simulation) chemistry transport model (CTM) and from Ozone Monitoring Instrument (OMI) satellite retrievals, averaged for the summertime period (April⁻September) during 2013. Here we show that the top-down NO emissions derived from LOTOS-EUROS for European urban areas agree well with the bottom-up NO emissions from the MACC-III inventory data (R² = 0.88) driving the CTM demonstrating the potential of this method.