Long Temporal Analysis of Nitrogen Dioxide Contents Over China Using Satellite And Ground Observations

In this study, the ground measured nitrogen dioxide (NO2) column at six sites of the AErosol RObotic NETwork (AERONET) in China were collected to evaluate the Global Ozone Monitoring Experiment-2 (GOME-2) tropospheric NO2 product. The results show the correlated coefficient of the two datasets is 0.851. The long temporal variations and spatial distributions of the GOME-2 tropospheric (trop) NO2 in the heating season (Nov, Dec, Jan and Feb) and the non-heating season over China were plotted. The results indicate that in the heating season, the trop NO2 column values in the North and East China are much higher in the non-heating seasons. Although the trends of the trop NO2 column in the non-heating season from 2013 to 2017 are significantly decreased, the variations in the heating are not significant. It proved that the coal heating can have a great impact on trop NO2 column variations in China.