7.
The paper summarizes results on the content and composition of aliphatic hydrocarbons (HCs) in suspended particulate matter (SPM) and bottom sediments in the Kara, Laptev, and East Siberian seas obtained in 2015–2018. It was established that the “losses” in HC concentrations in surface waters in the river (Ob, Yenisei, Lena, Khatanga, Indigirka, Kolyma) and seawater mixing zone in some cases exceeded their river removal by 90%. The composition of HCs in surface waters depends on the characteristics of the river catchment area, sampling season. and time of day (high/low tide) and basically coincides with the SPM distribution. In the pelagic zone of the seas, the HC content is close to the background (2–7 μg/L). The influence of anthropogenic input was established only in the Gulf of Ob, where the composition of alkanes is close to oil with a HC content of 86 μg/mg SPM. In bottom sediments, the particle size distribution determines the HCs, and terrigenous n-alkanes play the dominant role in the molecular composition.
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