主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2022, Vol. 38 ›› Issue (3): 52-64.doi: 10.3969/j.issn.1673-503X.2022.03.007

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Simulation on impacts of aerosol number concentration on physical characteristics of warm clouds during different growth stages

Guo-hang YU(),Su-ying YANG*(),Cheng-rong HU,Xuan-xuan LIU,Ya-ru LI,Zhi-yi LONG   

  1. Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Received:2022-01-18 Online:2022-06-28 Published:2022-07-23
  • Contact: Su-ying YANG E-mail:YGH0218@outlook.com;ysy@nuist.edu.cn

Abstract:

Based on the TAU2D cloud model with complete cloud microphysical processes, cloud microphysical characteristics of warm clouds generated by thermal turbulence under different aerosol concentrations(Na) were simulated.The results showed that with higher Na, cloud droplets radius becomes smaller, the collision coalescence of cloud droplets occurs later, and the broadening of cloud droplet spectral due to the collision-coalescence effect becomes weak, which results in narrower cloud droplet spectral with smaller standard deviation, slower development and longer life time of clouds, and later occurrence of precipitation.Otherwise, the larger size of cloud droplets tends to generate earlier collision-coalescence growth, distinct broadening of cloud droplet spectral with larger standard deviation, longer cloud life time, and earlier occurrence of precipitation.In the presence of high Na, the cloud droplet spectral exhibits a wider range during the collision-coalescence stage than in the condensation growth stage.During the deposition stage, the evaporation of clouds reduces small cloud droplets and thus makes the cloud droplet spectral slightly wider than that during the collision-coalescence stage.During the condensation growth stage, there is a positive correlation between cloud droplet number concentration (N) and relative dispersion degree(ε) under low Na conditions, while a negative correlation between them occurs under high Na conditions.During the collision-coalescence stage, there is a negative correlation between N and ε, and such a negative correlation is weakened with the increase of Na.In the deposition stage, there is a negative correlation between N and ε.

Key words: Aerosol, Warm cloud, Condensation growth, Collision-coalescence growth, Simulation

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