A Spatio-Temporal Analysis of Surface Albedo, Aerosol Optical Depth and Cloud Optical Thickness over East Asia Using COMS/MI Observations

Land surface albedo, a key component of Earth's energy balance, is influenced by aerosols and clouds, which impact atmospheric and surface temperatures, ultimately affecting the climate system.This study utilized data from the Communication, Ocean, and Meteorological Satellite (COMS) to analyze the long-term trends of surface albedo, Aerosol Optical Depth (AOD), and Cloud Optical Thickness (COT) over East Asia.From January 2012 to December 2019, surface albedo, AOD, and COT all showed decreasing trends in the region, with rates of -0.0003, -0.0008, and -0.0328, respectively.Spatial distribution analysis revealed that albedo experienced significant decreases in the Inner Mongolia region north of 40N latitude and southern China.AOD declined across most of the study area, with exceptions in certain parts of southern and northern China, while COT exhibited a consistent decrease across all regions.The findings of this study provide a foundational understanding of the climate characteristics of East Asia and offer valuable insights for future research into the correlation and causality between these climate variables through quantitative analyses.