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https://doi.org/10.5194/acp-2020-440
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-440
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 18 Jun 2020

Submitted as: research article | 18 Jun 2020

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This preprint is currently under review for the journal ACP.

Aerosol-induced high precipitation events near the Himalayan foothills

Goutam Choudhury1,2, Bhishma Tyagi1, Naresh Krishna Vissa1, Jyotsna Singh3, Chandan Sarangi4, Sachchida Nand Tripathi5, and Matthias Tesche2 Goutam Choudhury et al.
  • 1Department of Earth and Atmospheric Sciences, National Institute of Technology Rourkela, Rourkela 769008, Odisha, India
  • 2Leipzig Institute for Meteorology (LIM), Leipzig University, Stephanstrasse 3, 04103 Leipzig, Germany
  • 3Shanti Raj Bhawan, Paramhans Nagar, Kandwa, Varanasi 221106, India
  • 4Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600024, India
  • 5Department of Civil Engineering & Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur 208016, India

Abstract. Particulate emissions can alter the physical and dynamical properties of cloud systems and in turn amplify rainfall events over orographic regions downwind of highly polluted urban areas. The Indo-Gangetic Plains, one of the most polluted regions of the world, is located upwind of Himalayan foothills. The region, therefore, provides an opportunity for studying how aerosol effects in connection with orographic forcing affect extreme rainfall events. This study uses 17-years (2001–2017) of observed rain rate, aerosol optical depth (AOD), meteorological re-analysis fields, and outgoing longwave radiation to investigate high precipitation events at the foothills of the Himalayas. Composite analysis of all these collocated datasets for high precipitation events (daily rainfall > 95 percentile) is done to understand the inherent dynamics and linkages between AOD and extreme events. Clear and robust associations are found between high precipitation events, high aerosol loading and high moist static energy values. This finding highlights the crucial role of the aerosol direct radiative effect on high precipitation events over the Himalayan region.

Goutam Choudhury et al.

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Short summary
This study uses 17-years (2001–2017) of observed rain rate, aerosol optical depth (AOD), meteorological re-analysis fields, and outgoing longwave radiation to investigate high precipitation events at the foothills of the Himalayas. Composite analysis of all datasets for high precipitation events (daily rainfall > 95 percentile) indicates clear and robust associations between high precipitation events, high aerosol loading and high moist static energy values.
This study uses 17-years (2001–2017) of observed rain rate, aerosol optical depth (AOD),...
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