Mean January air temperatures in Siberian permafrost at 20−18 ka BP and comparison with modern values ...

• Main Authors: Vasil'chuk, Yurij K, Vasil'chuk, Alla Constantinovna
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Ice-wedge; Ice-wedge complex; Oxygen isotopes; Palaeotemperature reconstruction; radiocarbon dating; Siberian permafrost; Syngenetic; winter air temperatures; Yedoma; Event label; Location; δ18O; Temperature, air, January; Temperature, air, monthly minimum; Temperature, air, monthly maximum; Age, dated; Sample comment; Reference/source; Multiple investigations; Chukotka; Ice; permafrost; wedge*; Yakutia; Yamal Peninsula; Siberia
• Online Access: https://dx.doi.org/10.1594/pangaea.933669; https://doi.pangaea.de/10.1594/PANGAEA.933669

Palaeotemperature reconstruction for the period of 20−18 ka BP in Siberia is based on δ¹⁸O analysis and ¹⁴C dating of large syngenetic ice wedges of yedoma exposures from Yamal Peninsula to Chukotka. The modern relationship between δ¹⁸O composition of ice-wedge ice and winter temperature reveals Palaeotemperature reconstruction. Snow meltwater is considered to be the main source of ice-wedge ice. In modern ice wedges during the last 60–100 years δ¹⁸O fluctuates are between −14 and −20‰ in western Siberia and between −23 and −28‰ in northern Yakutia. The trend in δ¹⁸O distribution in ice wedges dated at 20−18 ka BP is similar to the modern one. δ¹⁸O values in Late Pleistocene wedges are more negative going from the west to the east: from −19 to −25‰ in western Siberian ice wedges to −30 to −35‰ in northern Yakutia. At 20−18 ka BP mean January temperatures were about 8–12°C lower (in Chukotka up to 17–18°C) than at present. ... : Mean January air temperaures of the Siberian permafrost were compiled from Vasil'chuk 1992 with additions and amendments).Data were submitted and proofread by Yurij K Vasil'chuk and Lyubov Bludushkina at the faculty of Geography, department of Geochemistry of Landscapes and Geography of Soils, Lomonosov Moscow State University. ...