This work studied emissions of aerosol Black Carbon (BC) from an urban area in the Arctic region. This pollutant species has significant climate forcing potential at high latitudes. Three months of real time BC measurements were made at an isolated location 4 km south-east of Salekhard City, on the Polar Circle in North-Western Siberia. Based on conditional probability function (CPF) analyses, wind directions from the city were correlated with high BC concentrations, tens of times higher than the arctic background observed nearby. According to official statistical data, diesel fuel and natural gas combustion are the primary sources of emissions in Salekhard. The diurnal BC trend identifies the significant impact of transport and heating emissions. In April-May, maximum BC concentrations of ~ 430 ng/m3 were recorded in the urban emission. In July, during area-wide wildfires, concentrations reached ~ 960 ng/m3; at this time the short-wavelength (470 nm absorption) data exceeded the long-wavelength (880 nm absorption) by a record value of ~ 260 ng/m3. This result identifies the smoke plume contribution to the atmosphere loading and deterioration of air quality in the urban environment.
Impact of Siberian biomass burning phase on optical properties of smoke aerosols is investigated in smallscale fires performed in a Large Aerosol Chamber (LAC). The analyses have revealed the influence of combustion temperature on scattering and light absorption of pine and debris smoke. Scattering in smoldering phase is significantly exceeding the flaming one. Spectral absorption obtained throughout the near-ultraviolet to near-infrared spectral region emphasizes the high absorption Angstrom exponent (AAE), up to 4.4 for fresh debris smoke, and a large fraction of light-absorbing brown carbon (BrC) in the smoldering phase. In opposite, open flaming smoke shows low AAE around 1, typical for high-temperature fossil fuel combustion while mixed fires emit particles absorbing with the intermediate AAE characteristics.
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