[Physical and Chemical Characteristics of Atmospheric Particles in Autumn in Mt. Huangshan].

To study the physical and chemical characteristics of single-particle aerosols in the background area of east China, a single-particle time-of-flight mass spectrometer (SPAMS) was used to observe the atmospheric particles in Mt. Huangshan from September 5, 2012 to October 28, 2012 and explore the influence of different air masses on the types and proportions of particles in combination with the HYSPLIT backward trajectory model. The results showed that the particles in Mt. Huangshan area can be divided into nine categories:Aged-EC, K, ECOC, OC, NaK, EC, ECHM, HM, and Minerals. Aged-EC accounted for the highest proportion, followed by K, and the aging degree of carbon particles was critical. The carbon particles classified as Aged-EC, ECOC, and OC were concentrated in the accumulation mode (0.2-1.4 μm), whereas HM, NaK, and Minerals were concentrated in the coarse particle mode (>1.4 μm). Apart from K, ECHM, and ECOC, higher wind speed was unfavorable to the accumulation of particles. The higher RH was, the higher the proportion of carbon particles was, while the proportions of K, OC, Minerals, and NaK were smaller. Cluster analysis results showed that the Mt. Huangshan area was mainly affected by northwest air mass, marine air mass, and local air mass. Industrial emissions and coal-burning activities in the surrounding areas were the primary contribution sources of Aged-EC.