Analysis of a Haze Process Caused by Peripheral Subsidence of Tropical Cyclones over the Pearl River Delta Region
A study is made by using the data obtained from Panyu Atmospheric Composition Station, Guangzhou, including aerosol particle mass concentration (PM10, PM2.5), black carbon concentration, ozone concentration, surface meteorological data, backward trajectories, vertical velocity, potential temperature and boundary layer. In this study, the causes of a haze process caused by peripheral subsidence of tropical cyclones over the Pearl River Delta region is analyzed. The results show that the peripheral subsidence of tropical cyclones make a stable meteorological condition for this haze process, in which the aerosol particles are mainly from local sources. The PM2.5 and PM10 account for nearly 70% while black carbon and PM10 is nearly 6.0%. The visibility is low in the morning because of the lowest boundary layer and highest relative humidity during a day.