| Abstract [eng] |
Application of Mass Spectrometry for Assessment of Carbon Aerosol Sources The aim of this study was to identify sources of carbonaceous aerosols at Preila (marine), Rūgšteliškis (rural) and Vilnius (urban background) sites during cold and warm seasons using two different methods and to compare the obtained results. Continuous measurements of black carbon (BC) and organic carbon (OC) aerosol concentration were performed at Preila, Rūgšteliškis and Vilnius during 2013 November – 2015 October using an Aethalometer and ACSM. The seasonal variations of OC/BC ratios were investigated for different environments and characterized by parameter α. The values of parameter α in marine environment were similar during cold and warm periods (79° and 81°, respectively). It showed that in marine atmosphere there is a strong constant influence of long-range transport. As OC/BC ratio remain unchanged during cold and warm periods, that determines the average of parameter α values (α = 80°) of the baseline. The value of parameter α in rural environment was similar to baseline during cold period (α = 77°) and increased during warm period (α = 84°) as result of local biogenic sources. Meanwhile, values of parameter α in urban environment were always lower than the baseline. The lowest value of parameter α was obtained for the warm period (α = 53°), suggested that the urban environment has strong influence of local anthropogenic sources (vehicle transport, industry and etc.). Higher value of parameter α in urban environment during cold period (α = 73°) indicates significant influence of local domestic biomass burning. Source apportionment using Positive Matrix Factorization (PMF) model was successfully applied. The solutions have been analyzed exploiting the software source finder (SoFi_6.0.). The selected solutions were oxidized organic aerosol (OOA), semi-volatile oxidized organic aerosol (SV OOA), low-volatile oxidized organic aerosol (LV-OOA), hydrocarbon-like organic aerosol (HOA), cooking organic aerosol, biomass burning organic aerosol (BBOA) and diesel exhaust (DKVTP). Comparison of identification of sources by parameter α values for Preila, Rūgšteliškis and Vilnius sites with those estimated by PMF show good agreement in all three environments. Thus, parameter α and PMF could be used as a tools to investigate the source of carbonaceous aerosol particles. |
