Tracing of atmospheric aerosol sources using stable carbon isotopes
AbstractThe identification of the pollution sources of incoming carbonaceous aerosols (total aerosol mass and PM2.5) at the Preila environment background station (Lithuania) during a winter period (2008) using the stable carbon isotope ratio δ13C is presented. For air mass transport analysis the Hybrid Single-Particle Lagrangian Integrated Trajectories (HYSPLIT) model was used. During the experiment the aerosol carbon isotopic δ13C ratio ranged from –24.0±v0.1 to –30.9±0.2∘/∘∘. The measurement data of the total aerosol mass particle δ13C values had not shown a significant variation and did not depend on the air mass transport directions. The mean δ13C value of these aerosol particles was –25.5±0.7∘/∘∘. It can be attributed to the local aerosol particle origin and it is of the same order as that of marine aerosol PM2.5δ13C values. The δ13C values for the aerosol particles PM2.5 transported from longer distances depended on the air mass transport directions. The mean value of δ13C (–30.9±0.2∘/∘∘) of aerosol particles in the continental air masses of the eastern direction was lower than that of aerosol particles in relatively clear marine air masses of the western direction (–24.0±0.1 to –25.4±0.3∘/∘∘). In the cases of other air mass transport events, samples (PM2.5) collected at the Preila site were a mix of aerosol particles from the marine environment and anthropogenic (fossil fuel combustion products) pollution sources.
Keywords: aerosol, PM2.5, carbon isotopic ratio
PACS: 92.20.Bk, 91.65.Dt, 91.62.La