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<p>Examining Aerosol Optical Depth (AOD) and Ångström Exponent (AE) is essential in environmental and atmospheric science, providing insights into aerosol characteristics and their broader implications. This relevance is observed locally and globally, given that atmospheric processes are closely tied to aerosol concentrations. This study focuses on the analysis of AOD and AE data obtained from Moderate Resolution Imaging Spectrometer (MODIS) satellite observations, concentrating on the Indo-Gangetic Plain (IGP), which includes the regions of Punjab, Haryana, Delhi, and Agra in Uttar Pradesh from 2018 to 2022. The dataset was rigorously analyzed on a daily, monthly, seasonal, and annual basis. The highest seasonal average AOD values were recorded during the monsoon season, with Delhi showing an average of 0.90 ± 0.13 in 2019, Agra at 0.876 ± 0.002 in 2019, Haryana at 0.75 ± 0.22 in 2018, and Punjab at 0.83 ± 0.16 in 2019. The highest mean AOD values were observed in Agra (0.652 ± 0.17 in 2021), Haryana (0.597 ± 0.21 in 2018), and Punjab (0.642 ± 0.14 in 2021) during the study period. The highest mean AE values were recorded in Delhi (1.566 ± 0.2 in 2021), Agra (1.54 ± 0.24 in 2021), Haryana (1.28 ± 0.33 in 2022), and Punjab (1.282 ± 0.45 in 2022). During the months of May, June, July, and August (MJJA) across several years, AOD values ranged from 0.3 to 0.55, while AE values varied between 1.3 and 1.5. Additionally, the mean AOD values were found to be highest in Agra (0.652 ± 0.17 in 2021), followed by Haryana (0.597 ± 0.21 in 2018) and Punjab (0.642 ± 0.14 in 2021). A comprehensive analysis of AOD and AE parameters from MODIS data significantly enhances our understanding of aerosol dynamics, laying the groundwork for addressing climatic implications in the IGP region.</p>

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Study of Aerosols Optical Depth and Ångström Exponent Over IGP: A Case Study

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Pushpendra Singh Soni,
  • Vikram Singh,
  • Alok Sagar Gautam,
  • Amar Deep,
  • Rolly Singh,
  • Alka Gautam,
  • Sneha Gautam,
  • Surendra Pratap Singh

摘要

Examining Aerosol Optical Depth (AOD) and Ångström Exponent (AE) is essential in environmental and atmospheric science, providing insights into aerosol characteristics and their broader implications. This relevance is observed locally and globally, given that atmospheric processes are closely tied to aerosol concentrations. This study focuses on the analysis of AOD and AE data obtained from Moderate Resolution Imaging Spectrometer (MODIS) satellite observations, concentrating on the Indo-Gangetic Plain (IGP), which includes the regions of Punjab, Haryana, Delhi, and Agra in Uttar Pradesh from 2018 to 2022. The dataset was rigorously analyzed on a daily, monthly, seasonal, and annual basis. The highest seasonal average AOD values were recorded during the monsoon season, with Delhi showing an average of 0.90 ± 0.13 in 2019, Agra at 0.876 ± 0.002 in 2019, Haryana at 0.75 ± 0.22 in 2018, and Punjab at 0.83 ± 0.16 in 2019. The highest mean AOD values were observed in Agra (0.652 ± 0.17 in 2021), Haryana (0.597 ± 0.21 in 2018), and Punjab (0.642 ± 0.14 in 2021) during the study period. The highest mean AE values were recorded in Delhi (1.566 ± 0.2 in 2021), Agra (1.54 ± 0.24 in 2021), Haryana (1.28 ± 0.33 in 2022), and Punjab (1.282 ± 0.45 in 2022). During the months of May, June, July, and August (MJJA) across several years, AOD values ranged from 0.3 to 0.55, while AE values varied between 1.3 and 1.5. Additionally, the mean AOD values were found to be highest in Agra (0.652 ± 0.17 in 2021), followed by Haryana (0.597 ± 0.21 in 2018) and Punjab (0.642 ± 0.14 in 2021). A comprehensive analysis of AOD and AE parameters from MODIS data significantly enhances our understanding of aerosol dynamics, laying the groundwork for addressing climatic implications in the IGP region.