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In this paper, Aerosol Optical Depth (AOD) analysis for 3 years (2017–2020) was attempted utilizing AERONET (aerosol robotic network) data over four megacities of the Asian continent. It was found that Indian cities had a higher mean AOD value than Chinese cities of Asia. However, there was a significant decrease (greater than China) in AOD values in 2019, when compared to previous year values. The 3-year study period provided an ample opportunity to study the surface aerosols and hence AOD in the tropospheric atmosphere in consideration to meteorological parameters over four mega cities of Asian region. On annual basis, AOD decreased over Kanpur (~0.58 to 0.41), Beijing (~0.42 to 0.37), and XiangHe (~0.46 to 0.35) but increased over Dibrugarh (~0.31 to 0.42) in the study period of 2017 to 2020. On comparing the seasonal AOD, the mean R-values at Kanpur of India were ~0.30, ~0.39, ~0.35, and ~0.40 for winter, summer, monsoon, and post-monsoon, respectively, whereas these seasonal mean R-values were found to be ~0.27, ~0.21, ~0.23, ~0.10 for winter, spring, summer, and autumn, respectively, over Beijing of China. It was therefore investigated that seasonal variations of different regions affect aerosol concentration. It was further suggested that some sort of control mechanism is essentially required to reduce the aerosol loading for a healthy environment in future.

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Spatio-Temporal Variations of Aerosol Optical Depth (AOD) Utilizing Ground-Based Observations Over Four Mega Cities of Asia

  • 会议论文

  • 发表日期：

    2025年

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  • Lakshmi,
  • Kiran Kumari,
  • Vijay Kumar Soni,
  • Adarsh Kumar

摘要

In this paper, Aerosol Optical Depth (AOD) analysis for 3 years (2017–2020) was attempted utilizing AERONET (aerosol robotic network) data over four megacities of the Asian continent. It was found that Indian cities had a higher mean AOD value than Chinese cities of Asia. However, there was a significant decrease (greater than China) in AOD values in 2019, when compared to previous year values. The 3-year study period provided an ample opportunity to study the surface aerosols and hence AOD in the tropospheric atmosphere in consideration to meteorological parameters over four mega cities of Asian region. On annual basis, AOD decreased over Kanpur (~0.58 to 0.41), Beijing (~0.42 to 0.37), and XiangHe (~0.46 to 0.35) but increased over Dibrugarh (~0.31 to 0.42) in the study period of 2017 to 2020. On comparing the seasonal AOD, the mean R-values at Kanpur of India were ~0.30, ~0.39, ~0.35, and ~0.40 for winter, summer, monsoon, and post-monsoon, respectively, whereas these seasonal mean R-values were found to be ~0.27, ~0.21, ~0.23, ~0.10 for winter, spring, summer, and autumn, respectively, over Beijing of China. It was therefore investigated that seasonal variations of different regions affect aerosol concentration. It was further suggested that some sort of control mechanism is essentially required to reduce the aerosol loading for a healthy environment in future.