Abstract：An Aerodyne Aerosol Chemical Speciation Monitor ACSM was deployed to continuously monitor the concentrations of non-refractory submicron particulate matter NR-PM1 and its species in March, August, October and December representing spring, late summer, autumn, and winter, respectively, in the southeast urban area of Beijing. The evolution characteristics of NR-PM1 and its species in different periods, especially during the haze days, and the sources of organic aerosol OA in the four seasons were investigated. The results showed that the average concentration of NR-PM1 was 22.06μg/m3 in the whole study period. The seasonal variation of NR-PM1 mass concentrations followed the order of spring > winter > autumn > late summer. In the study period, the average concentration of Org was 7.12μg/m3, accounting for 32.30% of NR-PM1; the average concentrations of NO3- and SO42- were 5.91 and 6.20μg/m3, respectively, accounting for 26.80% and 28.12% of NR-PM1 respectively; however, the average mass concentrations and mass fractions of both NH4+ and Cl- were lower. All species concentrations showed the order of Org > SO42-~NO3-> NH4+> Cl-. NR-PM1 in clean days was mainly characterized by Org, and the diurnal variations of all species in each season were smaller. However, NR-PM1 in haze days was mainly characterized by secondary inorganic species, and each species showed different diurnal variations in different seasons. OA species apportioned in different seasons were slightly different. The contributions of primary OA (POA) to OA gradually increased in the order of spring < late summer < autumn < winter, but secondary OA (SOA) to OA gradually decreased.
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