[Temporal-Spatial Characteristics and Variability in Aerosol Optical Depth over China During 2001-2017]

Area of Science:

• Atmospheric Science
• Remote Sensing
• Environmental Monitoring

Context:

• Analysis of Moderate Resolution Imaging Spectroradiometer (MODIS)/Terra C6.1 aerosol optical depth (AOD) data from 2001-2017.
• Focus on temporal-spatial distribution and variability trends of AOD across China.

Purpose:

• To investigate the spatial distribution characteristics of AOD in China.
• To analyze the temporal variation patterns of AOD.
• To identify trends in AOD variability over the study period.

Summary:

• High AOD centers identified in North China Plain, Central China, Yangtze River Delta, Pearl River Delta, Sichuan Basin, and Taklimakan Desert.
• Low AOD centers located in eastern Inner Mongolia and the Tibet Plateau.
• AOD peaks observed in spring and summer, with specific regional timing variations.
• Trends show initial decreases in Northwest China/Inner Mongolia and increases in East-Central/Southwest China (2001-2006).
• Shifting trends observed in Tibetan Plateau/Taklimakan Desert (2007-2012), with weakened growth in North China Plain/Sichuan Basin and a downward trend in Yangtze River Delta.
• Significant AOD decrease observed across most of China from 2013-2017.

Impact:

• Provides crucial insights into aerosol pollution distribution and evolution in China.
• Informs environmental policy and air quality management strategies.
• Contributes to understanding the impact of aerosols on climate and human health.