Preprints
https://doi.org/10.5194/acp-2022-652
https://doi.org/10.5194/acp-2022-652
 
06 Oct 2022
06 Oct 2022
Status: this preprint is currently under review for the journal ACP.

Aerosols-precipitation elevation dependence over the Central Himalayas using cloud-resolving WRF-Chem numerical modeling

Pramod Adhikari1,2 and John F. Mejia1,2 Pramod Adhikari and John F. Mejia
  • 1Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada, USA
  • 2Atmospheric Sciences Graduate Program, University of Nevada, Reno, Nevada, USA

Abstract. Atmospheric aerosols can modulate the orographic precipitation impacting the evolution of clouds through radiation and microphysical pathways. This study implements the cloud-resolving Weather Research and Forecasting model coupled with chemistry (WRF-Chem) to study the response of the Central Himalayan elevation-dependent precipitation to the atmospheric aerosols. The first monsoonal month of 2013 is simulated to assess the effect of aerosols through radiation and cloud interactions. The results show that the response of diurnal variation and precipitation intensities (light, moderate, and heavy) to aerosol radiation and cloud interaction depended on the different elevational ranges of the Central Himalayan region. Below 2000 m ASL, the total effect of aerosols resulted in suppressed mean light precipitation by 19 % while enhancing the moderate and heavy precipitation by 3 % and 12 %, respectively. In contrast, above 2000 m ASL, a significant reduction of all three categories of precipitation intensity occurred with the 11 % reduction in mean precipitation. These contrasting altitudinal precipitation responses to the increased anthropogenic aerosols can significantly impact the hydroclimate of the Central Himalayas, increasing the risk for extreme events and influencing the regional supply of water resources.

Pramod Adhikari and John F. Mejia

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-652', Anonymous Referee #1, 31 Oct 2022
  • RC2: 'Comment on acp-2022-652', Anonymous Referee #2, 05 Nov 2022

Pramod Adhikari and John F. Mejia

Pramod Adhikari and John F. Mejia

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Short summary
We used an atmospheric model to assess the impact of aerosols through radiation and cloud interaction on elevational-dependent precipitation and surface temperature over the Central Himalayan region. Results showed contrasting altitudinal precipitation responses to the increased aerosol concentration, which can significantly impact the hydroclimate of the Central Himalayas, increasing the risk for extreme events and influencing the regional supply of water resources.
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