TY - JOUR
T1 - Thermal properties of sediments in the East Siberian Arctic Seas
T2 - A case study in the Buor-Khaya Bay
AU - Chuvilin, Evgeny
AU - Bukhanov, Boris
AU - Grebenkin, Sergey
AU - Tumskoy, Vladimir
AU - Shakhova, Natalia
AU - Dudarev, Oleg
AU - Semiletov, Igor
AU - Spasennykh, Mikhail
N1 - Funding Information:
This research was partly supported by the Russian Science Foundation (grants 15-17-20032, 16-17-00051, 18-77-10004 and 18-77-10063). The authors are grateful for the support of the Skolkovo Institute of Science and Technology and the Ministry of Science and Higher Education of the Russian Federation . The authors thank anonymous reviewer for the insightful comments which helped to improve the manuscript and specialist of the Elsevier's Language Editing Service for the major improvement of the English language.
Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1
Y1 - 2021/1
N2 - The temperature and thermal properties of shelf sediments from the East Siberian, Laptev, and Kara Seas were determined from field investigations. The sediments were in an unfrozen cryotic state (ice-free) and showed negative temperatures, ranging from −1.0 to −1.4 °C. These temperatures imply the presence of widespread subsea permafrost from the shelf to the continental slope of the East Siberian Arctic Seas, reaching ~1000–1500 km off the coast. The thermal conductivity and heat capacity of sediments (up to a depth of 0.5 m) from the Eastern Arctic Seas averaged 0.95 W/(m·K) and 3010 kJ/(m3·K), respectively. We also conducted temperature and thermal conductivity measurements of the upper sediment horizons of the permafrost in the Laptev Sea shelf (drilling depth of 57 m). The analysis of sediment cores ensured the determination of thermal conductivity with depth. We also analyzed the influence of moisture content, density, particle size distribution, salinity, and thermal state on sediment thermal conductivity. The thermal conductivity of unfrozen cryotic (ice-free) sediments was predominantly dependent on the contents of silt and clay. In general, unfrozen cryotic sandy sediments had a thermal conductivity range 1.7–2.0 W/(m·K), a moisture content of ~20%, and a density of 2.0–2.2 g/сm3. Frozen (ice-containing) sediments showed higher thermal conductivities of 2.5–3.0 W/(m·K), with a density of 1.9–2.0 g/cm3 and a moisture content exceeding 25–30%. The high thermal conductivity of sand was associated with low salinity (0.1–0.2%), high ice content, and moderate unfrozen water content.
AB - The temperature and thermal properties of shelf sediments from the East Siberian, Laptev, and Kara Seas were determined from field investigations. The sediments were in an unfrozen cryotic state (ice-free) and showed negative temperatures, ranging from −1.0 to −1.4 °C. These temperatures imply the presence of widespread subsea permafrost from the shelf to the continental slope of the East Siberian Arctic Seas, reaching ~1000–1500 km off the coast. The thermal conductivity and heat capacity of sediments (up to a depth of 0.5 m) from the Eastern Arctic Seas averaged 0.95 W/(m·K) and 3010 kJ/(m3·K), respectively. We also conducted temperature and thermal conductivity measurements of the upper sediment horizons of the permafrost in the Laptev Sea shelf (drilling depth of 57 m). The analysis of sediment cores ensured the determination of thermal conductivity with depth. We also analyzed the influence of moisture content, density, particle size distribution, salinity, and thermal state on sediment thermal conductivity. The thermal conductivity of unfrozen cryotic (ice-free) sediments was predominantly dependent on the contents of silt and clay. In general, unfrozen cryotic sandy sediments had a thermal conductivity range 1.7–2.0 W/(m·K), a moisture content of ~20%, and a density of 2.0–2.2 g/сm3. Frozen (ice-containing) sediments showed higher thermal conductivities of 2.5–3.0 W/(m·K), with a density of 1.9–2.0 g/cm3 and a moisture content exceeding 25–30%. The high thermal conductivity of sand was associated with low salinity (0.1–0.2%), high ice content, and moderate unfrozen water content.
KW - Heat capacity
KW - Particle size distribution
KW - Salinity
KW - Sediments
KW - Shelf permafrost
KW - Temperature
KW - Thermal conductivity
KW - Unfrozen water
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U2 - 10.1016/j.marpetgeo.2020.104672
DO - 10.1016/j.marpetgeo.2020.104672
M3 - Article
AN - SCOPUS:85091662538
VL - 123
JO - Marine and Petroleum Geology
JF - Marine and Petroleum Geology
SN - 0264-8172
M1 - 104672
ER -