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<p>Cloudbursts (Cb) are cataclysmic events occurring frequently over the Western Himalayas (WH) which are very difficult to predict mainly due to less understood microphysical processes.&#xa0;Since 2012, the frequency of cloudburst occurrences has increased notably in the Western Himalayas, so a comprehensive study to investigate this has been carried out with the help of CloudSat data for the period 2012–2016 and MERRA-2 reanalysis was used. This study suggests that Cb are mixed phase clouds supporting homogeneous nucleation of ice particles formed from large supercooled liquid particles. In contrast to the Indo-Gangetic Plain (Igp) monsoon clouds, the spread of the size spectrum for liquid and ice particles is broader for Cb clouds. Evidence of a positive correlation (0.66) between maxima of liquid and ice effective radius in case of Cb, as compared to negligible correlation for Igp, supports the hypothesis of homogeneous freezing of large liquid particles which may be responsible for intense precipitation. This study provides the first ever deep insight into the Cb systems in WH using satellite-radar data.</p>

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Himalayan cloudbursts: a microphysical investigation

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Diya Das,
  • Bipasha Paul Shukla,
  • Anupam Priamvada

摘要

Cloudbursts (Cb) are cataclysmic events occurring frequently over the Western Himalayas (WH) which are very difficult to predict mainly due to less understood microphysical processes. Since 2012, the frequency of cloudburst occurrences has increased notably in the Western Himalayas, so a comprehensive study to investigate this has been carried out with the help of CloudSat data for the period 2012–2016 and MERRA-2 reanalysis was used. This study suggests that Cb are mixed phase clouds supporting homogeneous nucleation of ice particles formed from large supercooled liquid particles. In contrast to the Indo-Gangetic Plain (Igp) monsoon clouds, the spread of the size spectrum for liquid and ice particles is broader for Cb clouds. Evidence of a positive correlation (0.66) between maxima of liquid and ice effective radius in case of Cb, as compared to negligible correlation for Igp, supports the hypothesis of homogeneous freezing of large liquid particles which may be responsible for intense precipitation. This study provides the first ever deep insight into the Cb systems in WH using satellite-radar data.