Mean January air temperature in the northwest of Yakutia for the period between 47 and 12 cal ka BP reconstructed based on oxygen isotope composition of ice wedges (δ18OIW)

Isotopic analysis of ice wedges has been performed in the laboratory of the Water Problems Institute of the Russian Academy of Sciences (senior researcher A.D. Esikov) on a Varian Mat 250 mass spectrometer, sample preparation was carried out by the authors within a month after sampling.