Preprints
https://doi.org/10.5194/acp-2022-715
https://doi.org/10.5194/acp-2022-715
 
17 Nov 2022
17 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Model-based insights into aerosol perturbation on pristine continental convective precipitation

Mengjiao Jiang1,2, Yaoting Li1,3, Weiji Hu1, Yinshan Yang1,4, and Guy Brasseur2 Mengjiao Jiang et al.
  • 1Plateau Atmospheres and Environment Key Laboratory of Sichuan Province & School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
  • 2Max Planck Institute for Meteorology, Hamburg 20146, Germany
  • 3Civil Aviation Flight University of China, Guanghan 618307, China
  • 4State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China

Abstract. The Tibetan Plateau (TP) is of great importance for weather and climate due to its role as heat and water resource. Relatively clean aerosol conditions over the Plateau makes the study on the aerosol-cloud-precipitation interactions in this pristine continental region distinctive. In order to investigate the impacts of aerosols on small-scale convection processes over the TP, a convective event with precipitation observed on 24 July 2014 in Naqu was selected to explore the influence of aerosols on the onset and intensity of precipitation. We use the MERRA-2 reanalysis to derive the cloud condensation nuclei (CCN) , which can be regarded as the real-time background. These values are adopted to initialize the regional WRF 4.0 meteorological model and to simulate the onset of convective events and the formation of precipitation. Four sets of experiments, named clean (1/10 CCN), control (default setting), Tibetan Plateau (real CCN calculated from MERRA-2 analysis), and polluted (10 times CCN), were adopted for our simulations. A detailed analysis of microphysical processes shows that, with the increase in the aerosol number concentration, the conversion rate of cloud water to rain in clouds is first enhanced. Under polluted situations, the conversion process of cloud water to rain is suppressed; however, the transformation of cloud water to graupel and the development of convective clouds are favored. As a result, the onset of the precipitation is delayed and cold-rain intensity increases.

Mengjiao Jiang et al.

Status: open (until 29 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-715', Anonymous Referee #1, 24 Nov 2022 reply
  • RC2: 'Review of "Model-based insights into aerosol perturbation on pristine continental convective precipitation"', Anonymous Referee #3, 06 Dec 2022 reply

Mengjiao Jiang et al.

Mengjiao Jiang et al.

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Short summary
Relatively clean background aerosol over the Tibet Plateau makes the study on the aerosol-cloud-precipitation interactions distinctive. A convection on 24 July 2014 in Naqu was selected using WRF model including the Thompson aerosol-aware microphysical scheme. Our study has adopted a compromise approach to use the limited observations. The result shows that the transformation of cloud water to graupel and the development of convective clouds are favored under polluted situations.
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