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<p>In the present study the spatiotemporal behaviour of key atmospheric aerosols, namely carbon monoxide (CO), tropospheric ozone (O<sub>3</sub>) and Ultraviolet (UV)absorbing particles and their co-variability with monsoon rainfall across Eastern Uttar Pradesh (EUP) during 2019–2024 has been studied. For this work, sentinel‑5P (TROPOMI) aerosol-trace‑gas products and CHIRPS precipitation are analysed for May to October months. The results show pronounced peaks in the month of May and October for CO and UV Aerosol Index (UV-AI) which may be driven by biomass burning and industrial activity in those particular regions. The southwestern districts of EUP experience high ozone (O<sub>3</sub>) level before onset of monsoon like May–June and reduced under monsoon conditions because of reduced photochemical activities. This study underscores an inverse relationship between aerosol concentration and rainfall mainly in the core monsoon months of July and August which indicate high aerosol loading co-occurs with reduced rain and has critical implications for agricultural practices and water requirement in densely populated region like EUP. This study observes an inverse pattern of the interaction between aerosol and monsoon system which suggests the critical role of aerosol in modulating rainfall variability.</p>

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Associations and Co-variability of Atmospheric Aerosols with Monsoon Rainfall in Eastern Uttar Pradesh, India

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • R. Bhatla,
  • Richa Singh,
  • Shikha Maurya

摘要

In the present study the spatiotemporal behaviour of key atmospheric aerosols, namely carbon monoxide (CO), tropospheric ozone (O3) and Ultraviolet (UV)absorbing particles and their co-variability with monsoon rainfall across Eastern Uttar Pradesh (EUP) during 2019–2024 has been studied. For this work, sentinel‑5P (TROPOMI) aerosol-trace‑gas products and CHIRPS precipitation are analysed for May to October months. The results show pronounced peaks in the month of May and October for CO and UV Aerosol Index (UV-AI) which may be driven by biomass burning and industrial activity in those particular regions. The southwestern districts of EUP experience high ozone (O3) level before onset of monsoon like May–June and reduced under monsoon conditions because of reduced photochemical activities. This study underscores an inverse relationship between aerosol concentration and rainfall mainly in the core monsoon months of July and August which indicate high aerosol loading co-occurs with reduced rain and has critical implications for agricultural practices and water requirement in densely populated region like EUP. This study observes an inverse pattern of the interaction between aerosol and monsoon system which suggests the critical role of aerosol in modulating rainfall variability.