Modern lithomorphogenesis on the shelf of the East Siberian Arctic Seas and its relation to climate dynamics
|Theme||1. Environmental protection|
|Session Name||1.9 Climate change, forests and other ecosystems health in the Arctic region|
|Datetime||Sep 07, 2018 10:15 AM - 10:30 AM (UTC +3)|
|Author(s)||Anatoly Gavrilov (Lomonosov Moscow State University, Russian Federation), Elena Pizhankova (Lomonosov Moscow State University, Russian Federation)|
Underwater elevations are usually areas which are being scored. This was true for the shallows of the Laptev and East Siberian Seas during the last centuries. The average rates of increase in the sea depths in the shallows, appeared on the site of the Ice Complex islands-relicts, are 4.3 cm/year. According to the monitoring, since the beginning of the 2000s, the stabilization of the sea depths has been detected at the Semenovskaya and Vasilievskaya Shoals. In 2013, on the site of the Vasilievskaya Bank, a new island was discovered, which was named Yaya. The Island Zatoplyayemyy, in 60 km to the east from the Lena delta, and the Neizvestnyye Islands, near the southeastern shore of Bunge Land, were marked on topographic maps recently. In our opinion, their formation was likely to be facilitated by ice hummocks locating on the ground – stamukhas.
Warming causes an increase in the volume of suspended matter and other sedimentary material and, as a result, the accelerating of the coastal retreat, increasing depths of seasonal thawing of sediments, and intensification of bottom erosion. The duration of the ice-free period, the wave length, the frequency and the strength of storms, and the wind-induced surges have increased. However, at the present time, there is an increase in sedimentation in the shallows. The large-scale increase in the volume of terrestrial material and wave energy in conditions when stamukhas exist up to freezing results in accumulation of sediments along their perimeter. The freezing of accumulated sediments preserves formed islands.
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