Preprints
https://doi.org/10.5194/acp-2022-553
https://doi.org/10.5194/acp-2022-553
 
05 Sep 2022
05 Sep 2022
Status: this preprint is currently under review for the journal ACP.

Different aerosol effects on the daytime and nocturnal cloud-to-ground lightning in the Sichuan Basin

Haichao Wang1,2, Yongbo Tan1,2, Zheng Shi1,2,3, Ning Yang4, and Tianxue Zheng1,2 Haichao Wang et al.
  • 1School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 2China Meteorological Administration Aerosol-Cloud-Precipitation Key Laboratory, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 4Changzhou Institute of Technology, School of Aeronautical and Mechanical Engineering/Flight, Changzhou, 213032, China

Abstract. The effect of aerosols on lightning has been involved in many studies, but its mechanisms are complex and far from understood. The relationship between cloud-to-ground (CG) lightning and aerosols on an hourly time scale in the Sichuan Basin during 2010–2018 was investigated. The effects of aerosols, dynamics-thermodynamics factors (convective available potential energy: CAPE and vertical wind shear: SHEAR) and cloud-related factors (total column cloud liquid water: TCLW and total column cloud ice water: TCIW) on the CG lightning flashes on day and night were analysed. The diurnal variation of CG lightning flashes has two peaks under clean conditions, while only one peak was found in the diurnal variation of ground flash under polluted conditions. In the early morning and night, more CG lightning flashes were found under polluted conditions, but in other periods, the difference in the CG lightning flashes between polluted and clean conditions is insignificant. Similar results were also found in the percentage of positive CG lightning flashes. At night, aerosols are positively correlated with the CG lightning flashes, and the response of CG lightning flashes to CAPE, SHEAR and TCLW is more evident under high aerosol loading. In the afternoon, aerosols have no significant effects on CG lightning and its response to dynamics-thermodynamics and cloud-related factors. This difference seems to be caused by the different impacts of aerosol radiative and microphysical effects in these two periods. In the afternoon, aerosols may directly (indirectly) reduce the solar radiation reaching the ground and suppress convection through aerosol radiative effects (aerosol microphysical effects). Aerosols may also stimulate convection through microphysical effects. In this period, the two opposite effects of aerosols on convection offset each other. At night, without solar radiation, the aerosol microphysical effects may play a dominant role in the entire AOD range to promote convection.

Haichao Wang et al.

Status: open (until 17 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-553', Anonymous Referee #1, 09 Sep 2022 reply
  • RC2: 'Comment on acp-2022-553', Anonymous Referee #2, 25 Sep 2022 reply
  • RC3: 'Comment on acp-2022-553', Anonymous Referee #3, 25 Sep 2022 reply

Haichao Wang et al.

Haichao Wang et al.

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Short summary
The effects of aerosols on lightning are complex and still far from understood. We analysed the difference in the impacts of aerosols on lightning activity between daytime and nighttime in the Sichuan Basin. Results show that aerosols have no evident effects on lightning activity in the daytime, but tend to invigorate it in the nighttime. These results suggest that aerosols play different roles in the occurrence and development of convection and lightning activity between daytime and nighttime.
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