CONCENTRATIONS AND COMPOSITION OF HYDROCARBONS IN ICE AND SURFACE MICROLAYER OF THE BARENTS AND KARA SEAS IN JULY – AUGUST 2024

The paper presents data on the concentrations and composition of hydrocarbons (aliphatic hydrocarbons - AHC and polycyclic aromatic hydrocarbons - PAH) in ice, surface microlayer (SML, up to 1000 μm thick) and surface waters in the Barents and Kara Seas (cruise 96 of the R/V Akademik Mstislav Keldysh, July-August 2024). Due to the water content of the ice, only a slight accumulation of hydrocarbons occurs compared to surface waters and compared to the SML. As before, the influence of autochthonous processes on the composition of alkanes in ice and SML is insignificant and differs from their composition in multi-year ice. Despite the different sources of these hydrocarbon classes, a dependence in the distribution of AHC and PAH in suspension in the SML was observed for all the samples collected (r = 0.67, p = 0.05.). Key words: melting ice, surface microlayer, aliphatic and polycyclic aromatic hydrocarbons, alkanes, Barents and Kara Seas.