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: Age; dated; Aleshkinskaya_terrace; Ayon_Island; Cape_Sabler; Chekanovsky_Ridge; Chukotka; Russia; Duvanny_Yar-1; Ery_Maretayakha_River; Event label; Ice-wedge; Ice-wedge complex; Kotelny_M-2; Kotelny Island; Siberian; Krasivoe; Krasnoyarsk; Kular; Labaz_Lake_2; Labaz Lake; Location; Mamontov_Klyk_1; Mamontova_Gora-1; Mamontova_Khayata; Mayn_River; MULT; Multiple investigations; North Yakutia; Oxygen isotopes; Palaeotemperature reconstruction; Pit_Phoenix_Utinaya; Plakhinskii_Yar-1; radiocarbon dating; Reference/source; Sakha Republic; Sample comment; Seyakha_River_2; Siberian permafrost; Syngenetic; Temperature; air; January; monthly maximum; Arctic; Ice; permafrost; Permafrost and Periglacial Processes; Polar Geography; Polar Research; Polarforschung; Sakha; The Cryosphere; wedge*; Yakutia; Yamal Peninsula; Siberia
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.933669; https://doi.org/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.