Evaluation of TROPOMI and OMI Tropospheric NO2 Products Using Measurements from MAX-DOAS and State-Controlled Stations in the Jiangsu Province of China

The tropospheric vertical column density of NO2 (Trop VCD) can be obtained using satellite remote sensing, but it has been discovered that the Trop VCD is affected by uncertainties such as cloud fraction, terrain reflectivity, and aerosol optical depth. A certain error occurs in terms data inversion accuracy, necessitating additional ground observation verification. This study uses surface mass concentrations from China National Environmental Monitoring Center (CNEMC) sites Jiangsu Province, 2019 measured MAX-DOAS, respectively, to verify product (daily monthly average data), comes TROPOspheric Instrument (TROPOMI) Ozone (OMI). results show spatial distributions TROPOMI OMI exhibit a similar tendency seasonality, showing characteristics being high spring winter low summer autumn. On whole, concentration south Province higher than north. Pearson correlation coefficient (r) between CNEMC 0.9, which greater r (0.78) CNEMC; (0.69) MAX-DOAS (0.59) MAX-DOAS. As such, better previous generation at representing spatio-temporal distribution regional scope. other hand, products provided this constrain air quality forecasting models top-down emission inventory estimation.