Validation and inter-comparison of MODIS and VIIRS aerosol optical depth products against data from multiple observation networks over East China

Based on ground-based aerosol optical property observations from the Central China Comprehensive Experimental Site and Aerosol Robotic Network, Moderate Resolution Imaging Spectroradiometer (MODIS) Visible Infrared Radiometer Suite (VIIRS) depth (AOD) products between January 2016 February 2020 over East were evaluated compared both regional site scales. In addition, relationship retrieval error season, Ångström exponent, real AOD values was investigated. The results revealed that scale, Deep Blue (DB) algorithm outperformed Dark Target (DT) for all three platforms of Terra/Aqua MODIS NPP VIIRS (with 57%, 70%, respectively, collocations falling within expected range), yet DB failed to reach a satisfactory result at least 67% matchups range. On best most cropland sites. errors some sites exhibited seasonal patterns, which might be related field burning events long-distance transport. indicate DT 10-km croplands in needs further improvement.