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The study of the carbon isotope composition of atmospheric aerosol in the Arctic zone is of great importance for the pyrogenic carbon sources identification. Atmospheric aerosol samples were collected in the Arctic at the research station Ice Base Cape Baranov (the Severnaya Zemlya archipelago) from April 2018 to November 2019 and at Barentsburg (the Svalbard archipelago) from December 2018 to July 2019 and from November 2019 to February 2020. The carbon isotope composition (δ13C value) was determined in aerosol samples to identify the sources of carbonaceous aerosols. For Ice Base Cape Baranov the average δ13C value (–27.5±0.5%) of total carbon of the winter (2018-2019) aerosols lower than the average δ13C value (–26.8±0.8%) of the spring-summer (2019) aerosols. The average δ13С values of the atmospheric aerosols in Barentsburg showed that the δ13С value was –26.9‰ in winter, the δ13С value was –26.3‰ and – 26.1‰ in spring and summer, respectively. The increased δ13C values in spring and summer (2019) at the Ice Base Cape Baranov can likely be explained by the input of soot aerosol, the source of which is boreal forest fires at the Krasnoyarsk Region and the Republic of Sakha. According to the backward trajectories of the air masses, the transfer of soot particles to Barentsburg was carried out from Europe, North America and over the Arctic Ocean, and to the Severnaya Zemlya from the continental part of Krasnoyarsk Region and the Republic of Sakha.
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