Based on a dynamic model,we analyzed the impact of dust aerosol heating on the stability in the surrounding atmosphere,cumulus convection and precipitation in deep convective weather systems with sufficient water vapor.The results show that when dust aerosols are transported to deep convec-tive systems with sufficient water vapor at a height of 550 hPa,dust heating effect will warm the atmo-sphere,enhance disturbance development,reduce atmospheric stability,and promote cumulus convec-tion development and its latent heat release.Cumulus convection will cause convective heating and vor-ticity mixing,which will lead to strong vertical motion and further strengthen cumulus convection.This positive feedback process makes the entire deep convective weather system more unstable.The strength of positive feedback will increase as the disturbance horizontal scale decreases.The strong vertical mo-tion caused by vorticity mixing can transport dust in cumulus clouds from low to high levels.When dust exists at both 550 and 950 hPa heights at the same time,the heating effects of high and low layers will jointly accelerate the instability process of deep convective weather systems,among which the role of high-level dust is more significant.
维普
万方数据
