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

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.

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Metadata Access
Creator Vasil'chuk, Yurij K; Vasil'chuk, Alla Constantinovna
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2021
Funding Reference Russian Foundation for Basic Research, 18 05 60272; Russian Science Foundation, 19 17 00126
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 253 data points
Discipline Earth System Research
Spatial Coverage (72.567W, 62.250S, 171.259E, 75.255N); Sakha Republic, Russia; Chukotka, Russia; Krasnoyarsk, Russia; Yamal-Nenets, Russia; Kotelny Island, Siberian, Russia; North Yakutia, Russia; Labaz Lake; Yamal Peninsula, northwestern Siberia