We developed a “top-down” methodology combining the inversed chemistry transport modeling and satellite-derived tropospheric vertical column of NO2, and estimated the NOX emissions of Yangtze River Delta (YRD) region at a horizontal resolution of 9 km for January, April, July and October 2016. The top-down estimates of NOX emissions were calculated at 260.0 Gg/month, 24% less than the bottom-up one. The model performance based on top-down estimate was much better, suggesting the improvement of NOX emission estimation with the nonlinear inversed modeling and satellite observation constraint. The sensitivity analysis of O3 and SNA formation implied that VOCs control played a crucial role on O3 pollution abatement and that reducing NH3 emissions was the most effective way to alleviate SNA pollution for YRD in winter.
Congratulations to Yang Yang!
The bottom-up and top-down estimates of NOX emissions by month for the YRD region in 2016.