THERMAL CONDUCTIVITY OF BOTTOM SEDIMENTS IN THE EAST SIBERIAN ARCTIC SEAS: A CASE STUDY IN THE BUOR-KHAYA BAY

Evgeny Chuvilin, Boris Bukhanov, Sergey Grebenkin, Vladimir Tymskoy, Natalia Shakhova, Oleg Dudarev, Igor Semiletov

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Laboratory and Insitu Testing in Cold Regions / Essais en laboratoires et essais in situ pour les régions nordiques

ABSTRACT: Among Arctic carbon reservoirs, subsea permafrost, hydrates, and associated methane (CH4) deposits are the most worrisome owing to high heat transfer from rapidly warming shallow Arctic seas. The East Siberian Arctic Shelf is a big portion of the Arctic shelf and hosts over 80% of current subsea permafrost and along with it, unique Arctic shallow CH4 hydrates. Degradation of subsea permafrost results in increasing permeability for gaseous CH4 long preserved in seabed deposits within and beneath permafrost. Nevertheless, knowledge about the present thermal state of subsea permafrost is mainly based on modeling results, which are controversial. In that sense, actual values of thermal conductivity are crucially needed. In this report, we represent the first results of in situ measurements of the major sediment core thermodynamically parameters in the ESAS.

RÉSUMÉ: -marin, ainsi que les dépôts éthane associés (CH4), en raison du transfert de chaleur important qui provient du réchauffement rapide des mers arctiques peu profondes. Le plateau arctique de la Sibérie orientale couvre une partie importante du plateau continental arctique et accueille plus de 80 % du pergélisol sous-marin et, avec lui, les hydrates de méthane peu -marin résulte en une augmentation de la perméabilité du CH4 gazeux préservé dans les dépôts des fonds marins dans et sous le pergélisol. Néanmoins, les connaissances -marin sont principalement basées sur les résultats de modélisation qui sont controversés. En ce sens, les valeurs réelles de conductivité thermique sont absolument indispensables. Ce rapport présente les premiers résultats de mesures in situ des principaux paramètres thermodynamiques des carottes de sédiments du ESAS. 1. BACKGROUND AND MOTIVATION At present, deep bottom sediments of the Russian Arctic shelf, especially in its eastern part, are poorly investigated, because of geological operations are risky and quite expensive. Thus, until present any geological data obtained by drilling of the deep bottom sediments on the Arctic shelf are rare and unique (Romanovskii & Hubberten, 2001; Romanovskii et al., 2005; Shakhova & Semiletov, 2009). The discovery of massive methane emissions from bottom sediments of the East Siberian Arctic Shelf

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Cite this article:
Evgeny Chuvilin; Boris Bukhanov; Sergey Grebenkin; Vladimir Tymskoy; Natalia Shakhova; Oleg Dudarev; Igor Semiletov (2015) THERMAL CONDUCTIVITY OF BOTTOM SEDIMENTS IN THE EAST SIBERIAN ARCTIC SEAS: A CASE STUDY IN THE BUOR-KHAYA BAY in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{557,author = Evgeny Chuvilin; Boris Bukhanov; Sergey Grebenkin; Vladimir Tymskoy; Natalia Shakhova; Oleg Dudarev; Igor Semiletov,title = THERMAL CONDUCTIVITY OF BOTTOM SEDIMENTS IN THE EAST SIBERIAN ARCTIC SEAS: A CASE STUDY IN THE BUOR-KHAYA BAY,year = 2015}