Physicochemical characterization of aged biomass burning aerosol after long-range transport to Greece from large scale wildfires in Russia and surrounding regions, Summer 2010статья
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Аннотация:Smoke aerosol emitted by large scale wildfires in the European part of Russia and Ukraine, was transported
to Athens, Greece during August 2010 and detected at an urban background site. Measurements
were conducted for physico-chemical characterization of the aged aerosol and included on-line monitoring
of PM10 and carbonaceous particles mass concentrations, as well as number size distributions and
aerosol optical properties. In addition TSP filter samples were analyzed for major inorganic ions, while
morphology and composition of particles was studied by individual particle analysis. Results supported
the long-range transport of smoke plumes from Ukraine and Russia burning areas indicated by back
trajectory analysis. An increase of 50% and 40% on average in organic (OC) and elemental carbon (EC)
concentrations respectively, and more than 95% in carbonate carbon (CC) levels was observed for the
biomass burning (BB) transport period of August with respect to the previous month of July. Mean 24-
h OC/EC ratio was found in the range 3.2e8.5. Single scattering albedo (SSA) was also increased, indicating
abundance of light scattering constituents and/or shift of size distributions towards larger particles.
Increase in particle size was further supported by a decreasing trend in absorption Angstrom
exponent (AAE). Ion analysis showed major contribution of secondary species (ammonium sulfate and
nitrate) and soil components. Non-sea salt Kþ exhibited very good correlation with secondary species, indicating the long-range transport of BB smoke as a possible common source. Individual
particle analysis of the samples collected during BB-transport event in Athens revealed elevated
number of soot externally mixed with fly ash Ca-rich particles. This result is in agreement with the
increased OC and CC levels measured, thus pointing towards the main components comprising the aged
BB aerosol microstructure.