ИСТИНА

Aerosol particles are one of the major climate forcers in the Arctic. Aerosols reflect and absorb the incoming solar radiation, modify the properties of clouds, and affect the surface albedo (Asmi et al., 2015). It is suggested that a large fraction of the increase in the surface temperature of Arctic regions can be attributed to aerosols and especially to some specific components such as sulfate and BC (Black Carbon) (Shindell et al., 2009). The chemical characterization of aerosol samples collected in the Arctic region and the identification of the spatial origin of the species is very important and will assist researchers towards understanding the factors that affect the aerosol concentrations in those regions. To address the aforementioned topics, an 18-month campaign was conducted during the period of April 2015 to December 2016 in the Research station "Ice Base Cape Baranova" (79°16.82'N, 101°37.05'E), which is located in the very northern part of the Bolshevik island to the north from Taimyr. In total 120 PM samples were collected and batches of them were analyzed using different analytical techniques. The elemental composition and concentrations of EC and OC were determined in the samples. For the elemental analysis of PM samples, the high energy, polarization geometry energy dispersive XRF spectrometer Epsilon 5 by PANalytical was used. In total the concentration of 14 elements was quantified, namely Na, Mg, Al, S, Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, Ba and Pb. The elements that displayed the higher concentrations were Na and Cl which is a strong indication of the high contribution of sea spray to Arctic aerosol concentrations. For the determination of elemental (EC) and organic carbon (OC), the filters were analyzed by the thermo-optical method (Lab OC-EC Aerosol Analyzer, Sunset Lab- oratory, Inc.) (Diapouli et al., 2017). The concentrations of EC and OC were found to be comparable with other studies that have been conducted in the Arctic (Popovicheva et al., 2018)