10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Source Apportionment of Fossil Fuel and Biomass Burning Black Carbon (Bc) in the Milan Metropolitan City and Bareggio Sub-Urban Area Contrasting Locations
AMIRHOSEIN MOUSAVI, Mohammad Sowlat, Ario Ruprecht, Constantinos Sioutas, University of Southern California
Abstract Number: 926 Working Group: Carbonaceous Aerosol
Abstract In the current work, spatial and temporal variation of black carbon (BC) were evaluated at two sites, including Milan, a metropolitan area primarily impacted by urban emissions, and Bareggio, a sub-urban area, from July to October 2017. Using the Equivalent Black Carbon (EBC) model, sources of BC were apportioned using the BC measurement data from seven-wavelength (AEE33) and two-wavelength (AEE51) aethalometers for Milan and Bareggio, respectively. Result indicated that BC concentrations are ranging from 0.75-1.65 µg.m-3 in Bareggio with a peak in July and 1.05-1.56 µg.m-3 in Milan with the highest values in October. In addition, MAC values for both 370 nm (7.2±0.6 m2.s-1) and 880 nm (16.2±0.8 m2.s-1) wavelengths showed a consistent temporal trend and between the sites with slightly higher values for Bareggio. Moreover, fossil fuel combustion contributions to the total BC concentrations (ranging from 72% in Bareggio to 96% in Milan) are relatively higher than those of biomass burning (ranging from 10% in Milan to 26% in Bareggio). For fossil-fuel-originated black carbon (BCff), major peaks were observed during the traffic rush hours, whereas the contribution of black carbon that originated from biomass burning (BCbb) was maximum during nighttime reaching values as high as 25-30% of total BC concentrations in Bareggio site. Moreover, results of the ongoing measurements for the cold season of the study will also be presented to compare the levels and BCff% and BCbb% across different seasons.