Permafrost distribution offshore of West Yamal : extended abstract.

Rekant, Pavel, Cherkashov, Georgy, Vanshtein, B. and Krynitsky, P. (2005) Permafrost distribution offshore of West Yamal : extended abstract. Open Access In: Arctic Coastal Dynamics : report of the 5th International Workshop, McGill University, Montreal (Canada), 13-16 October 2004. , ed. by Rachold, Volker, Lantuit, Hugues, Couture, Nicole and Pollard, Wayne. Berichte zur Polar- und Meeresforschung, 506 . AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven, p. 95.

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The results of seismic studies in the near-shore, shallow waters of the south-western Kara Sea - at the Shpindler, Kharsavey and Mare-Sale sites - showed the presence of a seismic interface which can be interpreted as a submarine permafrost table. The proposed permafiost exhibits a continuous distribution and a strongly dissected top surface overlain by unfrozen sediments. The permafrost table is located at a depth of 4-6 m and 5-10 m below the sea floor at the Shpindler and Mare-Sale sites, respectively. Three dimensional modeling of the permafrost table suggests the presence of relict buried thermodenudational depressions (up to 2 km across) at a minimum sea depth of 40-45 m at the Shpindler and Mare-Sale sites. The depressions may be considered as paragenetic to thermocirques found in cliffs at the Shpindler site. At the Kharasavey site, the permafrost table has an elongated depression parallel to the modern shoreline. The maximum depression depth is 20 m below the seafloor.
At present, the relict therrnocirques (Shpindler and Mare-Sale) and the elongated depression (Kharasavey) are completely filled in with sediment and are not evident in modern bottom topography.

Document Type: Book chapter
Keywords: Permafrost; West Yamal; Kara Sea; Seismics; Coastal research
Open Access Journal?: Yes
Publisher: AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung
Projects: Laptev Sea System, Permafrost
Date Deposited: 11 Mar 2015 11:28
Last Modified: 26 Oct 2020 14:25

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