Analysis of Aerosol Types and Sources Over Taihu Lake Based on Aeronet Data

The characteristics and sources of aerosol types are investigated using AERONET dataset of Taihu site. The aerosols are classified into five types: Dust, Mixture, nonabsorbing fine-model aerosols (NA), slightly-absorbing finemodel aerosols (SA) and moderately-absorbing fine-model aerosols (MA), according to fine-mode fraction (FMF) and single-scattering albedo (SSA), respectively. The aerosol types in Taihu lake show strong seasonal periodicity, with NA and SA being the dominating aerosols (about 80% frequency). The Dust and Mixture aerosols occur mainly in spring and NA are mostly observed in summer. On the contrary, SA has the highest frequency in winter and the lowest in summer. Trajectory Cluster and frequency of different aerosol types are acquired by the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. The aerosols in Taihu Lake are mainly the emissions from the local and surrounding areas, with some being transmitted from the east coastal regions and the northern regions.