Permafrost and ground ice of the Arctic
Maslakov A., Belova N.G., Baranskaya A.V., Romanenko F.A. —
Massive ice beds of the eastern coast of the Chukchi Peninsula under climate change: some results of the 2014-2018 expeditions
// Arctic and Antarctica.
– 2018. – ¹ 4.
– P. 30 - 43.
DOI: 10.7256/2453-8922.2018.4.28528 URL: https://en. nbpublish.com/library_read_article.php?id=28528
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The article presents preliminary results of field studies of the outcrops of the eastern coast of the Chukchi Peninsula, containing massive ice beds. The expeditions were conducted in 2014–2018. Descriptions and photographs of ice and enclosing sediments are given. Four outcrops of ice up to 4.7 m thick and up to 45 m long are described within the Saint Lawrence Bay and Mechigmensky Bay. The morphology of the massive ice bodies, a variety of ice structures and host sediments allow suggesting their polygenetic origin. The results of long-term active layer thickness monitoring indicated that the intensification of thaw slump events in the past four years is associated with the increase in the depth of thawing, which in 2018 reached highest values in over two decades. The formation of thaw slumps and associated thermocirques is cyclic. As the active layer thickness increases, their number increases, forming nested thermocirques, and as the thaw depth decreases, cryogenic creep slows down.
Eastern Chukotka, retrogressive thaw slumps, complex destruction, thermocirques, slumps, massive ice beds, the Chukotsky peninsula, active layer, climate change, permafrost
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