ИСТИНА

Aerosol serves as a tracer of arctic pollution and allows a link to climate response when its major characteristics relating to natural and anthropogeneous sources are defined. Long - time gap in consistent aerosol observations in the Russian Arctic strongly limited the assessment of air pollution and climate impacts. The International Hydrometeorological Obsrvatory Tiksi was established on the coast of Laptev sea through an cooperation during the International Polar Year. Modern research station “Cape Baranova” was built on archipelago Severnaya Zemlia for the long-term atmospheric and ice observations. Aerosol stations were installed to carry out on-line monitoring, sampling, and analyses of atmospheric aerosols from 2014. Physico-chemical characterization combining aethalometry, analytical chemistry, and individual particle analyses is used in order to identify the seasonal variability of aerosols and link their composition to possible sources, as well as to characterize the differences in aerosol chemical composition between natural background conditions and BC-pollution episodes. The present study reports the first results from the HMO Tiksi and station “Cape Baranova” on season-dependent and source-influenced characteristics of aerosol species supported by individual particle analysis. Aerosol is found to be originated from natural marine and biogenic as well as influenced by regional pollution from the continent. Characterization of aerosols during pollution episodes, combined with analysis of the wind direction, atmosphere stability, and air mass trajectories, allows for the identification of the sources which are responsible for the emission of hazardous compounds. It is occurred to catch the plumes transported from industrialized regions of Siberia thus proving that anthropogenic sources, probably gas flaring, pollute high altitude.