ИСТИНА

Aerosol sampling system was firstly installed on the Tiksi Observatory in September of 2014 being complementary to on-line aerosol monitoring instrumentation. Sampling and measurement campaigns were performed in autumn (September) and winter (November, March) of 2014-2015. Comprehensive characterization of aerosol chemistry and microstructure are performed by a number of analytic techniques using for FF and BB particulate emission quantification (Popovicheva et al., 2014; 2015). Carbon (OC, EC) and ion content, composition of organic/ionorganic compounds are obtained by thermal–optical transmittance (TOT), capillary electrophoresis, and FTIR spectroscopy, respectively. Cluster analysis is used to apportion the individual particles measured by EM/EDX into major characteristic groups and identify the particle types representative of combustion and natural sources. In winter period of elevated BC concentration the carbonaceous aerosols coagulated with Na sulfates, containing up to 15% of sulfur, are dominated over regional soil dust composed from Fe oxides and aluminosilicates, Fig.1. Carbonates, nitrates, ammonium, and sulfates specify the inorganic compounds while alkanes and carbonyls determine the organic content. The ratio OC to EC and spectral absorption indicates the FF combustion source impact on aerosol composition. Analyses of boundary layer stratification confirm the impact of local urban sources. In opposite, in autumn at very low BC concentration the aerosols are composed from marine salts and regional soil dust, Fig.1. Snow coverage of tundra strongly decreases the abundance of O- and N-containing compounds of biogenic origin. During an episode of elevated BC concentration the significant abundance of soot and sulfates, up to 46 and 17.8%, are observed, allowing the identification of pollution from local FF source.