Submarine permafrost in the Laptev sea

摘要

The article presents results of permafrost scientific research in theKhatanga bay of the Laptev sea. Field works were organized in earlyspring 2017 by Rosneft Oil Company with participation of LomonosovMoscow State University, Far Eastern Federal University and ArcticResearch Centre. Research included geocryological drilling for subseapermafrost from the land fast ice, geophysical surveys and laboratorytests of thawed and frozen rock monoliths. In order to obtaininformation about subsea permafrost 13 core wells were drilled fromthe land fast ice in the Nordvik bay (sea depth ~15 m) to a depth of 50m with. Core data helped to define thermal characteristics of more than300 permafrost monoliths. With the means of special equipment morethan 1000 points of electromagnetic soundings were processed.Laboratory studies of the obtained samples combined withelectromagnetic sounding information allowed to construct thepermafrost horizon in the Nordvik bay and its immersion’s behavior toa depth of 200 m. Estimation of the permafrost distribution to thedepths of 500 m is presented in the paper as well as permafrostthickness dynamics simulation for 50 years.