The New TROPOMI CO Data Product: Monitoring Air Pollution with High Spatial Resolution and Daily Global Coverage

The Tropospheric Monitoring Instrument (TROPOMI) was successfully launched on the 13^th of October 2017 on ESA's Sentinel-5 Precursor satellite. The instrument performs spectral measurements from the ultra violet (UV) to the shortwave-infrared (SWIR) with an unpreceded spatial resolution of 7x7 km² and daily global coverage. The Netherlands Institute of Space Research (SRON) developed the Shortwave Infrared Carbon Monoxide Retrieval algorithm (SICOR) for the operational processing of the TROPOMI measurements. The first data release of TROPOMI, publicly available since July 2018, includes the CO total column product with an accuracy and precision of <15% and <10%, respectively. The data quality and the high spatial resolution of the TROPOMI measurements allow to sense CO pollution above cities and industrial areas with only single satellite overpasses. In this study, we report on the most recent analysis of the CO data quality and present first results on the estimate of localized CO emissions from TROPOMI observations using simulations of the Weather Research and Forecasting Model (WRF) for selected CO pollution hot spots urban areas (e.g. Tehran, Isfahan, Mashhad, and Yerevan) and main traffic arteries in the Mideast. The derived emissions and the temporal variation are evaluated in the context of the overall TROPOMI CO data quality.