The impacts of convection on aerosols scavenging and regeneration processes
WEI Shao-han, HU Rong, LI Gu-dong-ze, TANG Xian-bing, XU Wen-hui, CHEN Qian
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
Abstract：A squall line occurred during April 23~24, 2007 over Guangdong province, China has been simulated by using the Weather Research and Forecasting (WRF) model in order to investigate the impaction scavenging of aerosol particles by hydrometeors, aerosol regeneration due to complete evaporation of liquid drops, and effects of dynamical transport on the number concentration of aerosols. The results showed that there was a negative correlation between the precipitation and aerosol concentration near surface. By comparing the impaction scavenging rates by different types of hydrometeors and nucleation scavenging rates, it showed that droplet nucleation contributed most to the aerosol scavenging, followed by the impaction scavenging by rain drops at the lower troposphere and snow at the upper troposphere. Droplet nucleation scavenging and ice crystal nucleation scavenging were the dominant scavenging processes for hygroscopic and non-hygroscopic particles respectively. The variation of aerosol number concentration was the result of combined effects of cloud dynamical transport, wet scavenging and regeneration process due to the evaporation of liquid drops. The regeneration process mainly occurred from the surface to the 10km altitude. During the development of convection, the aerosol concentration near surface was significantly reduced whereas the heavy pollution area appeared around the non-precipitation area near the gust front due to the dynamical transport. At the upper troposphere, the number concentration of hygroscopic particles was reduced while that of non-hygroscopic particles was increased.
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