The Effects of Air Pollution on the Microphysical Characteristic of Heavy Precipitation in the Pearl River Delta

A fully coupled meteorology-chemistry-aerosol mesoscale model (WRF-Chem) is used to assess the effects of aerosols on heavy precipitation in the Pearl River Delta. Two sensitive experiments are performed for two scenarios with and without pollutant emissions source. The modelling results showed that the precipitation time with pollutant emissions source in the Pearl River Delta more delayed than that without pollutant emissions source, and the range of main precipitation center was decreased, along with the increase of the maximum value of precipitation rate. In terms of cloud microphysical conversions, the rate of autoconversion of cloud water into rainwater with the pollutant emissions source will increase.