The Tempo-Spatial Trends in Aerosol Optical Depth Over Eastern Asia Using Modis Measurements from 2001 To 2022

Based on the satellite aerosol optical thickness (AOD) data of MODIS/Terra (2001-2022), and MODIS/Aqua (2002-2022), we investigated the tempo-spatial distribution and trend of AOD in East Asia and the Northwest Pacific. An increasing trend (0.002~0.02/year with a 95% the confidence) is observed in all seven sub-regions from 2001 to 2013, and the increase rate of AOD is the largest in North China and South China, both of which reach 0.02/year. After the promulgation of the Air Pollution Prevention and Control Action Plan in China in 2013, the AOD in Northeast China, North China, South China, the East China Sea and the Northwest Pacific decrease significantly (-0.002~-0.02/year). The implementation of the Air Pollution Prevention and Control Action Plan is effective for the reduction of aerosols emission in China and then reduced the aerosols loading transported to the downwind area.